Category:Speleothem Working Group

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Overview

In the Linked Earth context, a working group (WG) is a self-organized coalition of knowledgeable experts, whose activities are governed herewith. This page is dedicated to the discussion of data and metadata standards for speleothems, and aims to formulate a set of recommendations for such a standard.

Membership

Members of 'Speleothem Working Group'

Specific tasks

We recommend that discussions focus on the following techniques, and explore potential commonalities.

Definition of essential, recommended, and desired in regards to paleoclimate data standards

For each observation type, we recommend:

  • structuring discussions around what scientific questions one would want to ask of the data
  • listing essential, recommended, and desired information for:
    • the measurements themselves
    • any inference made from the measurements (e.g. calibration to temperature)
    • the underlying uncertainties, and what those numbers correspond to (e.g. 1-sigma or 2-sigma?)
  • provide an ideal data table (or link to one) for each type of observation, so the community knows what to report and how to report it.
  • provide separate recommendations for new and legacy datasets

Things to describe

Site (cave)

  • Site name
  • Coordinates
  • Elevation
  • Geology
  • Rock Age
  • Have measurements been made of the cave environment over a season or several years (not one off)? Yes/No
For speleothem archives, regarding the site (cave) where the sample(s) was (were) obtained, should the name be:
You are not entitled to vote.
You are not entitled to view results of this poll.
There was one vote since the poll was created on 21:36, 24 April 2017.
poll-id AB9F391B2DB966B3034AD264AF0F0DCE

For spelothem archives, should the geology of the cave be:
You are not entitled to vote.
You are not entitled to view results of this poll.
There were 3 votes since the poll was created on 21:37, 24 April 2017.
poll-id B63A2049AF73AF9AECBFA36B0ECCCAC2

For speleothem archives, should the rock age of the cave be:
You are not entitled to vote.
You are not entitled to view results of this poll.
There were 3 votes since the poll was created on 21:37, 24 April 2017.
poll-id 337A7F6B07014085942DA0A71123A35C

Entity (speleothem)

  • Entity name
  • Distance from cave entrance (in m)
  • Thickness of overlying bedrock above the speleothem (in m)
  • Speleothem type (candlestick stalagmite, stalagmite boss, flowstone)
  • Drip type (seepage, seasonal, mixture, unknown)
  • Type of measurements available for that entity (stable isotopes, trace metals, organics, fluid inclusions, mineralogy, clumped isotopes, noble gas temperatures, C14, Optical Density of luminosity (ODL), Mg/Ca)
  • DOI/link for raw data (e.g NOAA, PANGAEA)
For speleothem archives, should the name of the physical sample be:
You are not entitled to vote.
You are not entitled to view results of this poll.
There were 3 votes since the poll was created on 20:29, 20 April 2017.
poll-id 7C59D3050C1CA3EB8C91D48708A76DB4

For speleothem archives, should the distance from the cave entrance be:
You are not entitled to vote.
You are not entitled to view results of this poll.
There were 3 votes since the poll was created on 20:29, 20 April 2017.
poll-id 6513930FF9869D405A754BFAB003D532

For speleothem archives, the thickness of overlying bedrock above the speleothem (in m) should be:
You are not entitled to vote.
You are not entitled to view results of this poll.
There were 3 votes since the poll was created on 20:30, 20 April 2017.
poll-id 9CA2F6138E534E8382767476DC19E355

Should the speleothem type (e.g, candlestick stalagmite, stalagmite boss, flowstone) be:
You are not entitled to vote.
You are not entitled to view results of this poll.
There were 3 votes since the poll was created on 20:30, 20 April 2017.
poll-id 41410C43036015CA7C4D01E95C834203

For speleothem archive, should the drip type (seepage, seasonal, mixture, unknown) be:
You are not entitled to vote.
You are not entitled to view results of this poll.
There were 3 votes since the poll was created on 20:31, 20 April 2017.
poll-id 07E726FB52104AF458DA7E3DAA5D5916

References (for each speleothem)

  • Citation
  • DOI

Chronology

Please see the chronologies WG for generalities about U/Th dating or layer-counting. If challenges specific to dating speleothems exist, please list relevant metadata properties below.

  • Date type (MC-ICP-MS, Alpha U/Th, U/Th TIMS, Annual laminations, cross-dating, c14)
  • Depth of the sample (in mm)
  • Thickness of the sample (in mm)
  • lab number
  • sample material dated (aragonite powder, calcite)
  • min/max weight of sample used for dating
  • Is date used in the original age model? Yes/No
  • For U/Th samples: uncorrected age, 238U content, 232Th content, 230Th content, 230Th/232Th ratio, 230th/238U activity, decay constants used, corrected age, year of chemistry

Age models

  • Age model type (linear between dates, polynomial fit, polynomial fit omitting outliers, bayesian, stalAge...)
  • For age models based in lamina counting, evidence that laminae are annual
  • For age models using C14 for deposition rate, evidence on robustness of assumed linearity

Sample data

  • Distance from top of speleothem
  • Thickness of analysed sample
  • Evidence of equilibrium (Hendy tests)
  • Year (with uncertainty)
  • Measurements with precision
  • Isotope standards (PDB, VPDB)
  • Correction made for aragonite?
For speleothem archive, should the distance from top of speleothem be:
You are not entitled to vote.
You are not entitled to view results of this poll.
There were 3 votes since the poll was created on 21:52, 24 April 2017.
poll-id 92DF7F273FD78182C1B97AB17663CF78

For speleothem archive, should the thickness of the analyzed sample be:
You are not entitled to vote.
You are not entitled to view results of this poll.
There were 3 votes since the poll was created on 21:58, 24 April 2017.
poll-id 753AABC2C06AFDE6819656DDF1D8FD15

For speleothem archive, should the evidence for equilibirum (Hendy tests) be:
You are not entitled to vote.
You are not entitled to view results of this poll.
There were 2 votes since the poll was created on 21:59, 24 April 2017.
poll-id 703907FFABA25FFA9D9C8C2F284ED589

For speleothem archive, should the precision on the measurements be:
You are not entitled to vote.
You are not entitled to view results of this poll.
There were 3 votes since the poll was created on 21:59, 24 April 2017.
poll-id A79EA4392B2575F8A55DE073F1FC4B67

For speleothem archive, should the standard (PDB,VPDB) be:
You are not entitled to vote.
You are not entitled to view results of this poll.
There were 3 votes since the poll was created on 22:00, 24 April 2017.
poll-id 1AB1B0ECE933E3D8D305CC2D714452C4

For speleothem archive, should the correction made for aragonite be:
You are not entitled to vote.
You are not entitled to view results of this poll.
There were 3 votes since the poll was created on 22:00, 24 April 2017.
poll-id 6A30E25D5B3A2203E5F6DEA7CC64FB1B

Modern Cave Conditions

The interpretation of geochemical or lithological signals embedded in speleothem archives relies sometimes heavily on implicit assumptions about cave hydrology. What parameters need to be archived to enable long-term re-use and better information extraction from speleothem datasets?

For datasets based on the speleothem , should metadata about modern cave conditions be:
You are not entitled to vote.
You are not entitled to view results of this poll.
There was one vote since the poll was created on 22:54, 24 April 2017.
poll-id B90DAAEA9432F732B869AACC6A03D64A

Above-Cave

  • soil thickness
  • vegetation type
For datasets based on the speleothem , should metadata about the soild sickness above the cave be:
You are not entitled to vote.
You are not entitled to view results of this poll.
There was one vote since the poll was created on 22:54, 24 April 2017.
poll-id 79EB03277C258F3AA6E1F0EFDA2E8D1B

For datasets based on the speleothem , should metadata about the vegetation above the cave be:
You are not entitled to vote.
You are not entitled to view results of this poll.
There was one vote since the poll was created on 22:55, 24 April 2017.
poll-id AE385ED6AE0967680D494A134D575106

In-Karst Hydrology

  • karst residence time
  • transit time distributions
  • porosity
  • rock overburden thickness
  • flow route type

In-Cave

  • Temperature
  • Humidity
  • pCO2
  • drip-rate
  • drip chemistry

References

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