Difference between revisions of "PaCTS v1.0"

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===Ice Cores===
 
===Ice Cores===
 +
 +
See the discussion on the ice cores working group [[:Category:Ice Cores Working Group | page]].
 +
 +
{| class= "wikitable"
 +
|-
 +
|+Recommendation for ice cores
 +
|-
 +
! Question || New datasets || Legacy datasets
 +
|-
 +
| possible melt in transport || Essential || Essential
 +
|-
 +
| depth of any melt layer || Essential || Essential
 +
|-
 +
| depth of ash layer || Essential || NA
 +
|-
 +
| all proxy observations determined in the core || Essential || Essential
 +
|-
 +
| continous vs discrete sampling || Essential || Essential
 +
|-
 +
| coring techniques || Essential || Recommended
 +
|-
 +
| core cutting techniques || Recommended || Desired
 +
|-
 +
| core storage conditions || Recommended || Desired
 +
|-
 +
| whether the bedrock has been reached || Recommended || Desired
 +
|-
 +
| borehole temperatures || Recommended || Desired
 +
|-
 +
| depth and composition of any organic material || Recommended || Desired
 +
|-
 +
| if available, any snowpit information from the same location || Recommended || Desired
 +
|-
 +
| core densities || Essential || Desired
 +
|-
 +
| depth of brittle ice || Essential || Desired
 +
|-
 +
| depth of firn/ice transition || Recommended || Recommended
 +
|-
 +
| presence of elongated bubbles || Recommended || Recommended
 +
|}
  
 
===Lake Sediments===
 
===Lake Sediments===
 +
 +
See the discussion on the lake sediments working group [[:Category:Lake Sediments Working Group | page]]
 +
 +
==== Accumulation rate ====
 +
 +
{| class= "wikitable"
 +
|-
 +
|+Recommendation for accumulation rate on lake sediment cores
 +
|-
 +
! Question || New datasets || Legacy datasets
 +
|-
 +
| accumulation rate || Essential || Essential
 +
|-
 +
| thickness || Essential || Essential
 +
|-
 +
| density || Essential || Essential
 +
|-
 +
| units || Essential || Essential
 +
|-
 +
| chronological constraints || Essential || Essential
 +
|-
 +
| accumulation rate type || Essential || Essential
 +
|-
 +
| method || Essential || Essential
 +
|-
 +
| pretreatment method || Recommended || Recommended
 +
|-
 +
| interpretation || Recommended || Recommended
 +
|}
 +
 +
==== Compound Specific Isotopes ====
 +
 +
{|class= "wikitable"
 +
|-
 +
|+Recommendation for compound specific isotopes on lake sediment cores
 +
|-
 +
! Question || New datasets || Legacy datasets
 +
|-
 +
| sample depth || Essential || Essential
 +
|-
 +
| compound(s) analyzed || Essential || Essential
 +
|-
 +
| source of compound in sediments || Essential || Essential
 +
|-
 +
| isotope measured || Essential || Essential
 +
|-
 +
| interpretation || Recommended || Recommended
 +
|}
 +
 +
==== Density ====
 +
 +
{|class= "wikitable"
 +
|-
 +
|+Recommendation for density measurements on lake sediment cores
 +
|-
 +
! Question || New datasets || Legacy datasets
 +
|-
 +
| density name (e.g., wet bulk density) || Essential || Essential
 +
|-
 +
| water content/porosity || Recommended || Recommended
 +
|-
 +
| original measurements || Essential || Essential
 +
|-
 +
| units || Essential || Essential
 +
|-
 +
| density type (inferred or measured) || Essential || Recommended
 +
|-
 +
| method (e.g. direct sampling) || Essential || Essential
 +
|-
 +
| interpretation || Recommended || Recommended
 +
|}
 +
 +
==== Imagery data ====
 +
 +
{|class= "wikitable"
 +
|-
 +
|+Recommendation for imagery data on lake sediment cores
 +
|-
 +
! Question || New datasets || Legacy datasets
 +
|-
 +
| reflectance or transmittance (by wavelength) || Essential || Essential
 +
|-
 +
| units || Essential || Essential
 +
|-
 +
| original measurements || Essential || Essential
 +
|-
 +
| post acquisition processing methods || Essential || Recommended
 +
|-
 +
| data reduction methods (peak or trough area method) || Recommended || Recommended
 +
|-
 +
| pretreatment methods || Essential || Recommended
 +
|-
 +
| analytical method || Essential || Recommended
 +
|-
 +
| analytical instrument || Recommended || Recommended
 +
|-
 +
| interpretation || Recommended || Desired
 +
|}
 +
 +
==== Magnetic data ====
 +
 +
{|class= "wikitable"
 +
|-
 +
|+Recommendation for magnetic data on lake sediment cores
 +
|-
 +
! Question || New datasets || Legacy datasets
 +
|-
 +
| position of the core within the lake basin || Essential || Essential
 +
|-
 +
| ancillary data about the archive (carbonate and organic content) || Recommended || Recommended
 +
|-
 +
| flag that the signal recorded hasn't been altered by geochemisty || Essential || Recommended
 +
|}
 +
 +
==== Mineralogy ====
 +
 +
{|class= "wikitable"
 +
|-
 +
|+Recommendation for mineralogy on lake sediment cores
 +
|-
 +
! Question || New datasets || Legacy datasets
 +
|-
 +
| relative abundance (by mineral) || Essential || Essential
 +
|-
 +
| units || Essential || Essential
 +
|-
 +
| original measurements || Essential || Recommended
 +
|-
 +
| mineralogy type || Recommended || Recommended
 +
|-
 +
| pretreatment method || Essential || Recommended
 +
|-
 +
| analytical method || Essential || Essential
 +
|-
 +
| analytical instrument || Recommended || Recommended
 +
|-
 +
| interpretation || Recommended || Recommended
 +
|}
 +
 +
==== Multiple cores ====
 +
 +
{|class= "wikitable"
 +
|-
 +
|+Recommendation for multiple cores
 +
|-
 +
! Question || New datasets || Legacy datasets
 +
|-
 +
| mid-point depth (core depth) || Essential || Recommended
 +
|-
 +
| mid-point depth (composite depth) || Essential || Essential
 +
|-
 +
| thickness || Essential || Recommended
 +
|-
 +
| information about the relationship between core depth and composite depth || Essential || Recommended
 +
|}
 +
 +
 +
====Particle size ====
 +
 +
{| class= "wikitable"
 +
|-
 +
|+Recommendation for particle size on lake sediment cores
 +
|-
 +
! Question || New datasets || Legacy datasets
 +
|-
 +
| % volume or mass by grain size class/interval || Essential || Essential
 +
|-
 +
| units || Essential || Essential
 +
|-
 +
| original measurements || Essential || Recommended
 +
|-
 +
| summary statistics used to characterize distribution || Recommended || Recommended
 +
|-
 +
| particle size type || Essential || Recommended
 +
|-
 +
| pretreatment methods || Essential || Recommended
 +
|-
 +
| anlytical method (e.g. laser diffraction) || Essential || Recommended
 +
|-
 +
| analytical instrument || Recommended || Recommended
 +
|-
 +
| interpretation || Recommended || Recommended
 +
|}
  
 
===Marine Sediments===
 
===Marine Sediments===
 +
 +
See the discussion on the marine sediments working group [[:Category:Marine Sediment Working Group | page]].
 +
 +
==== General ====
 +
 +
{|class= "wikitable"
 +
|-
 +
|+Recommendation for marine sediments
 +
|-
 +
! Question || New datasets || Legacy datasets
 +
|-
 +
| gear type for collection of the archive || Recommended || Recommended
 +
|-
 +
| volume of sediment analyzed || Recommended || Recommended
 +
|}
 +
 +
 +
==== Alkenones ====
 +
 +
{|class= "wikitable"
 +
|-
 +
|+Recommendation for alkenones on marine sediments
 +
|-
 +
! Question || New datasets || Legacy datasets
 +
|-
 +
| index value || Essential || Essential
 +
|-
 +
| method of sediment extraction || Essential || Essential
 +
|-
 +
| raw peak areas || Recommended || Recommended
 +
|-
 +
| alkenone concentration || Essential || Recommended
 +
|-
 +
| C37-C39 compound concentration || Essential || Recommended
 +
|-
 +
| analytical method (retention time vs mass spec, LOD, LOQ) || Essential || Essential
 +
|}
 +
 +
==== Bulk sediment geochemistry ====
 +
 +
{|class= "wikitable"
 +
|-
 +
|+Recommendation for bulk sediment geochemistry on marine sediments
 +
|-
 +
! Question || New datasets || Legacy datasets
 +
|-
 +
| sample pretreatment || Essential || Recommended
 +
|}
 +
 +
==== GDGTs ====
 +
 +
{|class= "wikitable"
 +
|-
 +
|+Recommendation for GDGTs measurements on marine sediments
 +
|-
 +
! Question || New datasets || Legacy datasets
 +
|-
 +
| GDGT index || Essential || Essential
 +
|-
 +
| core lipids or IPLs analyzed || Essential || Essential
 +
|-
 +
| method of sediment extration || Essential || Recommended
 +
|-
 +
| raw peak areas || Recommended || Recommended
 +
|-
 +
| definition of the index used || Essential || Essential
 +
|}
 +
 +
==== Micropaleontology ====
 +
 +
{|class= "wikitable"
 +
|-
 +
|+Recommendation for micropaleontological determination on marine sediments
 +
|-
 +
! Question || New datasets || Legacy datasets
 +
|-
 +
| raw counts || Essential || Essential
 +
|-
 +
| minimum number of speciments || Essential || Recommended
 +
|-
 +
| size fraction || Essential || Essential
 +
|-
 +
| seasonality || Recommended || Recommended
 +
|-
 +
| habitat depth || Essential || Recommended
 +
|-
 +
| training set || Recommended || Recommended
 +
|}
 +
 +
 +
==== Foraminifera ====
 +
 +
===== Geochemistry =====
 +
 +
{|class= "wikitable"
 +
|-
 +
|+Recommendation for geochemical measurements on foraminifera
 +
|-
 +
! Question || New datasets || Legacy datasets
 +
|-
 +
| Genus || Essential || Essential
 +
|-
 +
| Species || Essential || Essential
 +
|-
 +
| taxonomy being followed || Essential || Recommended
 +
|}
 +
 +
===== Stable Isotopes =====
 +
 +
{|class= "wikitable"
 +
|-
 +
|+Recommendation for stable isotopes measurements on foraminifera
 +
|-
 +
! Question || New datasets || Legacy datasets
 +
|-
 +
| cleaning methodology || Essential || Essential
 +
|-
 +
| cleaning methodology reference || Recommended || Recommended
 +
|-
 +
| number of specimens utilized by sample || Essential || Essential
 +
|-
 +
| size fraction || Essential || Essential
 +
|-
 +
| method of sediment disintegration and washing || Essential || Recommended
 +
|-
 +
| equilibirum offset || Essential || Recommended
 +
|-
 +
| seasonality || Recommended || Recommended
 +
|-
 +
| habitat depth || Essential || Recommended
 +
|-
 +
| standard (e.g. VPDB) || Essential || Essential
 +
|-
 +
| contamination indicators || Recommended || Recommended
 +
|}
 +
 +
===== Trace elements =====
 +
 +
{|class= "wikitable"
 +
|-
 +
|+Recommendation for trace elements measurements on foraminifera
 +
|-
 +
! Question || New datasets || Legacy datasets
 +
|-
 +
| cleaning methodology || Essential || Essential
 +
|-
 +
| cleaning methodology reference || Recommended || Recommended
 +
|-
 +
| number of specimens utilized per sample || Essential || Essential
 +
|-
 +
| size fraction || Essential || Essential
 +
|-
 +
| method of sediment disintegration and washing || Essential || Essential
 +
|-
 +
| correction || Essential || Essential
 +
|-
 +
| seasonality || Recommended || Recommended
 +
|-
 +
| habitat depth || Recommended || Recommended
 +
|-
 +
| contamination indicators || Essential || Recommended
 +
|-
 +
| standard || Essential || Essential
 +
|}
 +
 +
===== Boron isotopes =====
 +
 +
{|class= "wikitable"
 +
|-
 +
|+Recommendation for boron isotopes measurements on foraminifera
 +
|-
 +
! Question || New datasets || Legacy datasets
 +
|-
 +
| separation method || Essential || Essential
 +
|-
 +
| analysis method || Essential || Essential
 +
|-
 +
| sample size (ng of boron analyzed) || Essential || Essential
 +
|-
 +
| standard || Essential || Essential
 +
|-
 +
| water depth (benthic foraminifera) || Essential || Recommended
 +
|}
  
 
===MARPA===
 
===MARPA===
 +
 +
See the discussion on the MARPA working group [[:Category:MARPA Working Group | page]]. Please note that most of the properties described in this working group formed the basis for the cross-archive recommendations.
 +
 +
{|class= "wikitable"
 +
|-
 +
|+Recommendation for MARPA archives
 +
|-
 +
! Question || New datasets || Legacy datasets
 +
|-
 +
| interpolated chronology || Essential || Essential
 +
|-
 +
| X-ray pictures || Recommended || Recommended
 +
|}
  
 
===Speleothems===
 
===Speleothems===
 +
 +
See the discussion on the speleothems working group [[:Category:Speleothem Working Group | page]].
 +
 +
==== Cave ====
 +
 +
{|class= "wikitable"
 +
|-
 +
|+Recommendation for cave metadata for speleothems archives
 +
|-
 +
! Question || New datasets || Legacy datasets
 +
|-
 +
| cave geology || Essential || Recommended
 +
|-
 +
| rock age || Essential || Recommended
 +
|}
 +
 +
 +
==== Modern cave conditions ====
 +
 +
{|class= "wikitable"
 +
|-
 +
|+Recommendation for modern cave conditions metadata for speleothems archives
 +
|-
 +
! Question || New datasets || Legacy datasets
 +
|-
 +
| soil thickness || Recommended || Recommended
 +
|-
 +
| vegetation type || Recommended || Recommended
 +
|-
 +
| karst residence time || Recommended || Recommended
 +
|-
 +
| karst transit time distribution || Recommended || Recommended
 +
|-
 +
| karst porosity || Recommended || Recommended
 +
|-
 +
| rock overburden thickness || Recommended || Recommended
 +
|-
 +
| flow route type || Recommended || Recommended
 +
|-
 +
| in-cave temperature || Essential || Recommended
 +
|-
 +
| in-cave humidity || Essential || Recommended
 +
|-
 +
| in-cave pCO2 || Essential || Recommended
 +
|-
 +
| in-cave drip rate || Recommended || Recommended
 +
|-
 +
| in-cave drip chemistry || Recommended || Recommended
 +
|}
 +
 +
==== Physical Sample ====
 +
 +
{|class= "wikitable"
 +
|-
 +
|+Recommendation for physical samples metadata for speleothems archives
 +
|-
 +
! Question || New datasets || Legacy datasets
 +
|-
 +
| distance from cave entrance || Recommended || Recommended
 +
|-
 +
| thickness of overlying bedrock over the speleothem || Recommended || Recommended
 +
|-
 +
| speleothem type (e.g. candlestick, flowstone) || Essential || Recommended
 +
|-
 +
| drip type || Recommended || Recommended
 +
|-
 +
| type of measurements available || Essential || Recommended
 +
|}
 +
 +
==== Sample data ====
 +
 +
{|class= "wikitable"
 +
|-
 +
|+Recommendation for sample data metadata for speleothems archives
 +
|-
 +
! Question || New datasets || Legacy datasets
 +
|-
 +
| thickness of analyzed sample || Essential || Essential
 +
|-
 +
| evidence of equilibrium || Essential || Recommended
 +
|-
 +
| isotope standards || Essential || Essential
 +
|-
 +
| correction made for aragonite || Essential || Recommended
 +
|}
  
 
===Trees===
 
===Trees===
 +
See the discussion on the trees working group [[:Category:Trees Working Group | page]].
 +
 +
{|class= "wikitable"
 +
|-
 +
|+Recommendation for trees metadata
 +
|-
 +
! Question || New datasets || Legacy datasets
 +
|-
 +
| missing ring || Essential || Essential
 +
|-
 +
| taxonomy (genus/species) || Essential || Essential
 +
|-
 +
| tree height || Recommended || Recommended
 +
|-
 +
| tree diameter || Essential || Essential
 +
|-
 +
| soil description || Recommended || Recommended
 +
|-
 +
| soil depth || Recommended || Recommended
 +
|-
 +
| bedrock description || Desired || Desired
 +
|-
 +
| knots || Desired || Desired
 +
|-
 +
| ring count || Essential || Essential
 +
|-
 +
| average ring width || Essential || Essential
 +
|-
 +
| number of unmeasured innner rings || Essential || Desired
 +
|-
 +
| number of unmeasured outer rings || Essential || Desired
 +
|-
 +
| missing heartwood rings to pith || Essential || Recommended
 +
|-
 +
| missing heartwood rings to pith foundation || Essential || Recommended
 +
|-
 +
| number of sapwood rings || Essential || Recommended
 +
|-
 +
| last ring under bark || Recommended || Recommended
 +
|-
 +
| missing sapwood rings to bark || Recommended || Desired
 +
|-
 +
| missing sapwood rings to bark foundation || Recommended || Desired
 +
|-
 +
| pith year || Essential || Essential
 +
|-
 +
| death year || Essential || Essential
 +
|}
 +
 +
==== Detrending ====
 +
 +
{|class= "wikitable"
 +
|-
 +
|+Recommendation for detrending of trees records
 +
|-
 +
! Question || New datasets || Legacy datasets
 +
|-
 +
| software used || Essential || Essential
 +
|-
 +
| version used || Essential || Recommended
 +
|-
 +
| detrending method name (e.g. polynomial, exponential) || Essential || Essential
 +
|-
 +
| method parameters || Essential || Recommended
 +
|}
 +
 +
==== Stable isotopes ====
 +
 +
{|class= "wikitable"
 +
|-
 +
|+Recommendation for stables isotopes measurements on trees
 +
|-
 +
! Question || New datasets || Legacy datasets
 +
|-
 +
| whether or not a chronology was established || Essential || Essential
 +
|-
 +
| if there is no chronology (or it is floating) how was age established || Essential || Essential
 +
|-
 +
| if it is a tropical tree how was the age model established || Essential || Essential
 +
|-
 +
| were samples pooled or are samples single ring/single tree measurements || Essential || Essential
 +
|-
 +
| what portion of the ring was analyzed || Essential || Essential
 +
|-
 +
| whether samples were pre-treated by conversion to alpha cellulose, holo cellulose or left unprocessed || Essential || Essential
 +
|-
 +
| pretreatment method || Essential || Essential
 +
|-
 +
| analysis date || Recommended || Desired
 +
|-
 +
| isotope measured || Essential || Essential
 +
|-
 +
| 13C data corrected for Seuss effect || Essential || Essential
 +
|-
 +
| correction used || Essential || Essential
 +
|}
  
 
===Chronologies===
 
===Chronologies===
Line 346: Line 947:
  
 
===Uncertainties===
 
===Uncertainties===
 +
 +
See the discussion on the uncertainties working group [[:Category:Uncertainty Working Group | page]]
 +
 +
==== Measured variables ====
 +
 +
{|class= "wikitable"
 +
|-
 +
|+Recommendation for reporting uncertainties on the measured variables
 +
|-
 +
! Question || New datasets || Legacy datasets
 +
|-
 +
| analytical uncertainty || Essential || Recommended
 +
|-
 +
| reproducibility || Recommended || Recommended
 +
|-
 +
| if based on reproducibility, number of repeat measurements || Essential || NA
 +
|}
 +
 +
==== Models ====
 +
 +
{|class= "wikitable"
 +
|-
 +
|+Recommendation for reporting uncertainties on models
 +
|-
 +
! Question || New datasets || Legacy datasets
 +
|-
 +
| publication information about the software || Essential || Recommended
 +
|-
 +
| parameters || Essential || Recommended
 +
|-
 +
| output ensembles || Recommended || Recommended
 +
|-
 +
| output summary statistics (e.g., mean, media, standard deviation) || Recommended || Recommended
 +
|}
  
 
==Road to v2.0==
 
==Road to v2.0==
 +
 +
 +
A discussion forum on how to evolve this standard is available through the [http://linked.earth/forums/forum/pacts-v1-0/ LinkedEarth site].  A blog post summarizing priorities is available [http://linked.earth/paleoclimate-data-standards-a-community-pact-and-its-future/ here].

Latest revision as of 05:47, 20 June 2019

This page describes the first version of PaCTS (Paleoclimate Community reporTing Standard).

Background

This page describes PaCTS v1.0, which represents the first attempt by the paleoclimate community to standardize the reporting of paleoclimate data. To do so, the community organized itself in working groups centered around the main proxy archives. To see detailed discussions about how the standards evolved, see the current working groups (shortcut on the left).

The recommendation follows a vote on this platform, the LinkedEarth twitter account, and a survey distributed to the community through various platforms (e.g., listservs, PAGES network).

PaCTS v1.0

Each property is either deemed essential (without which the record can't be reused), recommended (necessary to reuse the record optimally), and desired.

In this context a legacy dataset is defined as a dataset that has not been contributed by the original author (see here for details).

Cross Archive Metadata

See the discussion in the cross-archive metadata working group page.

Datasets

Table 1: Recommendation for cross-archive metadata
Question New datasets Legacy datasets
contributor Essential Essential
latitude Essential Essential
longitude Essential Essential
altitude Essential Essential
site name Essential Essential
dataset version Essential Recommended
any publication information Essential Essential
publication authors Essential Essential
publication year Essential Essential
publication title Essential Essential
publication doi Essential Essential
publication journal Essential Essential
funding information Desired Desired
funding principal investigator Desired Desired
funding agency Desired Desired
funding country Desired Desired
funding grant Desired Desired
any paleodata information Essential Essential
any chrondata information Essential Essential
depth/distance/position in the archive Essential Essential
information about how depth is transformed to age Essential Recommended
sample thickness Essential Recommended
original measurements Essential Essential
units Essential Essential
analysis date Recommended Desired
any additional data measured along the primary data of interest Recommended Recommended
interpretation Recommended Recommended
calibrated values Essential Recommended
calibration model Essential Recommended
calibration reference Recommended Recommended
physical sample name Recommended Desired
physical sample IGSN Recommended Desired
physical sample collection method Recommended Desired
instrument type Essential Recommended
laboratory name Recommended Desired
analytical method Essential Recommended
method reference Recommended Desired


Compilations

Table 2: Recommendation for compilations
Question New compilations Legacy compilations
compilation name Essential Essential
compilation authors Essential Essential
funding agency Desired Desired
funding principal investigator Desired Desired
funding grant number Desired Desired
funding country Desired Desired
model used to compile data Essential Essential
compilation date Essential Recommended
compilation version Essential Recommended
compilation change log Essential Recommended
publication title Essential Essential
publication authors Essential Essential
publication year Essential Essential
publication journal Essential Essential
publication doi Essential Essential
publication from previous work Essential Recommended
unique identifier to the time series used in the compilation Essential Recommended

Historical Documents

To see the discussion on historical documents, see this page

Recommendation for historical data
Question New datasets Legacy datasets
URL to external Pages (scans, pages) Recommended Recommended
quote ID for later reference Essential Recommended
reference to quote source Essential Essential
pages from which the quote is extracted from Recommended Recommended
language of the quote (or its translation) Recommended Recommended
quote's protolanguage Recommended Recommended
quote Essential Essential
quote's license Recommended Recommended
quote's doi Essential Recommended

Ice Cores

See the discussion on the ice cores working group page.

Recommendation for ice cores
Question New datasets Legacy datasets
possible melt in transport Essential Essential
depth of any melt layer Essential Essential
depth of ash layer Essential NA
all proxy observations determined in the core Essential Essential
continous vs discrete sampling Essential Essential
coring techniques Essential Recommended
core cutting techniques Recommended Desired
core storage conditions Recommended Desired
whether the bedrock has been reached Recommended Desired
borehole temperatures Recommended Desired
depth and composition of any organic material Recommended Desired
if available, any snowpit information from the same location Recommended Desired
core densities Essential Desired
depth of brittle ice Essential Desired
depth of firn/ice transition Recommended Recommended
presence of elongated bubbles Recommended Recommended

Lake Sediments

See the discussion on the lake sediments working group page

Accumulation rate

Recommendation for accumulation rate on lake sediment cores
Question New datasets Legacy datasets
accumulation rate Essential Essential
thickness Essential Essential
density Essential Essential
units Essential Essential
chronological constraints Essential Essential
accumulation rate type Essential Essential
method Essential Essential
pretreatment method Recommended Recommended
interpretation Recommended Recommended

Compound Specific Isotopes

Recommendation for compound specific isotopes on lake sediment cores
Question New datasets Legacy datasets
sample depth Essential Essential
compound(s) analyzed Essential Essential
source of compound in sediments Essential Essential
isotope measured Essential Essential
interpretation Recommended Recommended

Density

Recommendation for density measurements on lake sediment cores
Question New datasets Legacy datasets
density name (e.g., wet bulk density) Essential Essential
water content/porosity Recommended Recommended
original measurements Essential Essential
units Essential Essential
density type (inferred or measured) Essential Recommended
method (e.g. direct sampling) Essential Essential
interpretation Recommended Recommended

Imagery data

Recommendation for imagery data on lake sediment cores
Question New datasets Legacy datasets
reflectance or transmittance (by wavelength) Essential Essential
units Essential Essential
original measurements Essential Essential
post acquisition processing methods Essential Recommended
data reduction methods (peak or trough area method) Recommended Recommended
pretreatment methods Essential Recommended
analytical method Essential Recommended
analytical instrument Recommended Recommended
interpretation Recommended Desired

Magnetic data

Recommendation for magnetic data on lake sediment cores
Question New datasets Legacy datasets
position of the core within the lake basin Essential Essential
ancillary data about the archive (carbonate and organic content) Recommended Recommended
flag that the signal recorded hasn't been altered by geochemisty Essential Recommended

Mineralogy

Recommendation for mineralogy on lake sediment cores
Question New datasets Legacy datasets
relative abundance (by mineral) Essential Essential
units Essential Essential
original measurements Essential Recommended
mineralogy type Recommended Recommended
pretreatment method Essential Recommended
analytical method Essential Essential
analytical instrument Recommended Recommended
interpretation Recommended Recommended

Multiple cores

Recommendation for multiple cores
Question New datasets Legacy datasets
mid-point depth (core depth) Essential Recommended
mid-point depth (composite depth) Essential Essential
thickness Essential Recommended
information about the relationship between core depth and composite depth Essential Recommended


Particle size

Recommendation for particle size on lake sediment cores
Question New datasets Legacy datasets
 % volume or mass by grain size class/interval Essential Essential
units Essential Essential
original measurements Essential Recommended
summary statistics used to characterize distribution Recommended Recommended
particle size type Essential Recommended
pretreatment methods Essential Recommended
anlytical method (e.g. laser diffraction) Essential Recommended
analytical instrument Recommended Recommended
interpretation Recommended Recommended

Marine Sediments

See the discussion on the marine sediments working group page.

General

Recommendation for marine sediments
Question New datasets Legacy datasets
gear type for collection of the archive Recommended Recommended
volume of sediment analyzed Recommended Recommended


Alkenones

Recommendation for alkenones on marine sediments
Question New datasets Legacy datasets
index value Essential Essential
method of sediment extraction Essential Essential
raw peak areas Recommended Recommended
alkenone concentration Essential Recommended
C37-C39 compound concentration Essential Recommended
analytical method (retention time vs mass spec, LOD, LOQ) Essential Essential

Bulk sediment geochemistry

Recommendation for bulk sediment geochemistry on marine sediments
Question New datasets Legacy datasets
sample pretreatment Essential Recommended

GDGTs

Recommendation for GDGTs measurements on marine sediments
Question New datasets Legacy datasets
GDGT index Essential Essential
core lipids or IPLs analyzed Essential Essential
method of sediment extration Essential Recommended
raw peak areas Recommended Recommended
definition of the index used Essential Essential

Micropaleontology

Recommendation for micropaleontological determination on marine sediments
Question New datasets Legacy datasets
raw counts Essential Essential
minimum number of speciments Essential Recommended
size fraction Essential Essential
seasonality Recommended Recommended
habitat depth Essential Recommended
training set Recommended Recommended


Foraminifera

Geochemistry
Recommendation for geochemical measurements on foraminifera
Question New datasets Legacy datasets
Genus Essential Essential
Species Essential Essential
taxonomy being followed Essential Recommended
Stable Isotopes
Recommendation for stable isotopes measurements on foraminifera
Question New datasets Legacy datasets
cleaning methodology Essential Essential
cleaning methodology reference Recommended Recommended
number of specimens utilized by sample Essential Essential
size fraction Essential Essential
method of sediment disintegration and washing Essential Recommended
equilibirum offset Essential Recommended
seasonality Recommended Recommended
habitat depth Essential Recommended
standard (e.g. VPDB) Essential Essential
contamination indicators Recommended Recommended
Trace elements
Recommendation for trace elements measurements on foraminifera
Question New datasets Legacy datasets
cleaning methodology Essential Essential
cleaning methodology reference Recommended Recommended
number of specimens utilized per sample Essential Essential
size fraction Essential Essential
method of sediment disintegration and washing Essential Essential
correction Essential Essential
seasonality Recommended Recommended
habitat depth Recommended Recommended
contamination indicators Essential Recommended
standard Essential Essential
Boron isotopes
Recommendation for boron isotopes measurements on foraminifera
Question New datasets Legacy datasets
separation method Essential Essential
analysis method Essential Essential
sample size (ng of boron analyzed) Essential Essential
standard Essential Essential
water depth (benthic foraminifera) Essential Recommended

MARPA

See the discussion on the MARPA working group page. Please note that most of the properties described in this working group formed the basis for the cross-archive recommendations.

Recommendation for MARPA archives
Question New datasets Legacy datasets
interpolated chronology Essential Essential
X-ray pictures Recommended Recommended

Speleothems

See the discussion on the speleothems working group page.

Cave

Recommendation for cave metadata for speleothems archives
Question New datasets Legacy datasets
cave geology Essential Recommended
rock age Essential Recommended


Modern cave conditions

Recommendation for modern cave conditions metadata for speleothems archives
Question New datasets Legacy datasets
soil thickness Recommended Recommended
vegetation type Recommended Recommended
karst residence time Recommended Recommended
karst transit time distribution Recommended Recommended
karst porosity Recommended Recommended
rock overburden thickness Recommended Recommended
flow route type Recommended Recommended
in-cave temperature Essential Recommended
in-cave humidity Essential Recommended
in-cave pCO2 Essential Recommended
in-cave drip rate Recommended Recommended
in-cave drip chemistry Recommended Recommended

Physical Sample

Recommendation for physical samples metadata for speleothems archives
Question New datasets Legacy datasets
distance from cave entrance Recommended Recommended
thickness of overlying bedrock over the speleothem Recommended Recommended
speleothem type (e.g. candlestick, flowstone) Essential Recommended
drip type Recommended Recommended
type of measurements available Essential Recommended

Sample data

Recommendation for sample data metadata for speleothems archives
Question New datasets Legacy datasets
thickness of analyzed sample Essential Essential
evidence of equilibrium Essential Recommended
isotope standards Essential Essential
correction made for aragonite Essential Recommended

Trees

See the discussion on the trees working group  page.
Recommendation for trees metadata
Question New datasets Legacy datasets
missing ring Essential Essential
taxonomy (genus/species) Essential Essential
tree height Recommended Recommended
tree diameter Essential Essential
soil description Recommended Recommended
soil depth Recommended Recommended
bedrock description Desired Desired
knots Desired Desired
ring count Essential Essential
average ring width Essential Essential
number of unmeasured innner rings Essential Desired
number of unmeasured outer rings Essential Desired
missing heartwood rings to pith Essential Recommended
missing heartwood rings to pith foundation Essential Recommended
number of sapwood rings Essential Recommended
last ring under bark Recommended Recommended
missing sapwood rings to bark Recommended Desired
missing sapwood rings to bark foundation Recommended Desired
pith year Essential Essential
death year Essential Essential

Detrending

Recommendation for detrending of trees records
Question New datasets Legacy datasets
software used Essential Essential
version used Essential Recommended
detrending method name (e.g. polynomial, exponential) Essential Essential
method parameters Essential Recommended

Stable isotopes

Recommendation for stables isotopes measurements on trees
Question New datasets Legacy datasets
whether or not a chronology was established Essential Essential
if there is no chronology (or it is floating) how was age established Essential Essential
if it is a tropical tree how was the age model established Essential Essential
were samples pooled or are samples single ring/single tree measurements Essential Essential
what portion of the ring was analyzed Essential Essential
whether samples were pre-treated by conversion to alpha cellulose, holo cellulose or left unprocessed Essential Essential
pretreatment method Essential Essential
analysis date Recommended Desired
isotope measured Essential Essential
13C data corrected for Seuss effect Essential Essential
correction used Essential Essential

Chronologies

To know more about the standardization process, check the chronologies working group page.

Absolute chronologies

Lead
Recommendation for chronologies based on lead isotopes
Question New datasets Legacy datasets
calculated excess 210Pb values Essential Essential
226Ra Essential Recommended
total 210Pb Essential Essential
salt correction applied Essential Recommended
porosity Recommended Recommended
depth/position Essential Essential
sample thickness Essential Essential
core collection date Essential Essential
methodology used to calculate age Essential Essential
Radiocarbon
Recommendation for chronologies based on radiocarbon
Question New datasets Legacy datasets
sample ID Essential Essential
type/matrix Essential Essential
chemical pretreatment Recommended Recommended
analytical method Essential Essential
laboratory ID Essential Recommended
d13C ratio Recommended Recommended
conventional radiocarbon age Essential Essential
F14C (13C and background correction applied) Essential Recommended
marine reservoir age Essential Essential
deltaR value Essential Essential
hard/soft water effect Recommended Recommended
other corrections Recommended Recommended
U series
Recommendation for chronologies based on U-series
Question New datasets Legacy datasets
all isotopes ratios and concentrations measured Essential Essential
uncertainty for all parameters Essential Essential
uncertainty expressed as 2sigma Essential Essential
state whether uncertainty on decay constant are included in final estimates Essential Essential
sample identifier Essential Essential
reference material name Essential Essential
reference material descriptions Essential Recommended
reference material values Essential Essential
decay constant used Essential Essential
isotopes in spike Essential Recommended
method of spike calibration Essential Recommended
method of calibration for all activity or atom ratios reported (e.g. secular equilibirum or gravimetric) Essential Essential
activity or atom ratios for 230Th/238U (or 230Th/234U) and 234U/238U Essential Essential
230Th/232Th activity or atom ratio Essential Essential
calibration model Essential Essential
date of analysis or reference age Recommended Recommended
concentrations of 238U, 234U, 230Th, 232Th (plus 226Ra and Ba if measured) Essential Essential
sample preparation Essential Essential
chemical separations Essential Recommended
sample preservation Essential Recommended
sample mineralogy Recommended Recommended
bulk composition and mineral phases (for silicates) Essential Recommended

Relative chronologies

Recommendation for relative chronologies
Question New datasets Legacy datasets
original measurements Essential Essential
alignment target Essential Essential
labelling features Essential Recommended
method (employed software or manual) Essential Essential
flag for mixed chronologies Essential Recommended

Software

Recommendation for chronology software
Question New datasets Legacy datasets
method (e.g., Bacon, Oxcal, Bchron, BAM...) Essential Essential
publication information about the software Essential Recommended
code Desired Desired
parameters Recommended Recommended
ensemble age models if applicable Recommended Recommended
ensemble statistics if applicable Recommended Desired

Uncertainties

See the discussion on the uncertainties working group page

Measured variables

Recommendation for reporting uncertainties on the measured variables
Question New datasets Legacy datasets
analytical uncertainty Essential Recommended
reproducibility Recommended Recommended
if based on reproducibility, number of repeat measurements Essential NA

Models

Recommendation for reporting uncertainties on models
Question New datasets Legacy datasets
publication information about the software Essential Recommended
parameters Essential Recommended
output ensembles Recommended Recommended
output summary statistics (e.g., mean, media, standard deviation) Recommended Recommended

Road to v2.0

A discussion forum on how to evolve this standard is available through the LinkedEarth site. A blog post summarizing priorities is available here.

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