PaCTS v1.0

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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

MARPA

Speleothems

Trees

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

Road to v2.0