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

Note: Do not edit the polls (even for typos) once voting has started as it will reset the vote counts to zero. If a change needs to be made, make an annotation above the old poll (i.e., above the poll tags) and place the new poll below the first one.


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 were 3 votes since the poll was created on 02:07, 9 May 2017.
poll-id 9CBB1CD6F47EBC7153CEA253EAE32880

Results of the poll placed on Twitter from May 9th to 16th 2017
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 14:37, 24 April 2017.
poll-id B63A2049AF73AF9AECBFA36B0ECCCAC2

Results of the poll placed on Twitter from May 9th to 16th 2017
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 14:37, 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)

Note: Do not edit the polls (even for typos) once voting has started as it will reset the vote counts to zero. If a change needs to be made, make an annotation above the old poll (i.e., above the poll tags) and place the new poll below the first one.

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 13:29, 20 April 2017.
poll-id 7C59D3050C1CA3EB8C91D48708A76DB4

Results of the poll placed on Twitter between April 21st and 28th 2017
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 13:29, 20 April 2017.
poll-id 6513930FF9869D405A754BFAB003D532

Results of the poll placed on Twitter between April 24th and May 1st 2017
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 13:30, 20 April 2017.
poll-id 9CA2F6138E534E8382767476DC19E355

Results of the poll placed on Twitter between April 24th and May 1st 2017
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 13:30, 20 April 2017.
poll-id 41410C43036015CA7C4D01E95C834203

Results of the poll placed on Twitter between May 17th and 24th 2017
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 13:31, 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?

Note: Do not edit the polls (even for typos) once voting has started as it will reset the vote counts to zero. If a change needs to be made, make an annotation above the old poll (i.e., above the poll tags) and place the new poll below the first one.

Results of the poll placed on Twitter from June 6th to 13th 2017
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 14:52, 24 April 2017.
poll-id 92DF7F273FD78182C1B97AB17663CF78

Results of the poll placed on Twitter between May 26th and June 2nd 2017
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 14:58, 24 April 2017.
poll-id 753AABC2C06AFDE6819656DDF1D8FD15

Results of the poll placed on Twitter between May 26th and June 2nd 2017
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 14:59, 24 April 2017.
poll-id 703907FFABA25FFA9D9C8C2F284ED589

Comment from User:Anoronha on Twitter and liked by User:KJohnson

'I'd hesitate to label some of this info (i.e. Hendy tests) as desired. Implies that records that have it are better than those that don't.'

Further comment:

'Hendy Test, and the concept of equilib frac in speleos in general, has generally been demostrated to be wrong. I would argue that this metadata is counterproductive. Hendy Test/evidence of equilib frac is ultimately a derived value. More useful to only include raw data over test known to be unreliable.'
Results of the poll placed on Twitter between May 26th and June 2nd 2017
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 14:59, 24 April 2017.
poll-id A79EA4392B2575F8A55DE073F1FC4B67

For speleothem archive, should the standard (PDB,VPDB) be:
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There were 3 votes since the poll was created on 15:00, 24 April 2017.
poll-id 1AB1B0ECE933E3D8D305CC2D714452C4

Results of the poll placed on Twitter between June 6th and 13th 2017
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 15:00, 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?

Note: Do not edit the polls (even for typos) once voting has started as it will reset the vote counts to zero. If a change needs to be made, make an annotation above the old poll (i.e., above the poll tags) and place the new poll below the first one.

For datasets based on the speleothem , should metadata about modern cave conditions be:
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There was one vote since the poll was created on 15:54, 24 April 2017.
poll-id B90DAAEA9432F732B869AACC6A03D64A

Above-Cave

  • soil thickness
  • vegetation type

Note: Do not edit the polls (even for typos) once voting has started as it will reset the vote counts to zero. If a change needs to be made, make an annotation above the old poll (i.e., above the poll tags) and place the new poll below the first one.

For datasets based on the speleothem , should metadata about the soild sickness above the cave be:
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There was one vote since the poll was created on 15:54, 24 April 2017.
poll-id 79EB03277C258F3AA6E1F0EFDA2E8D1B

For datasets based on the speleothem , should metadata about the vegetation above the cave be:
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There was one vote since the poll was created on 15:55, 24 April 2017.
poll-id AE385ED6AE0967680D494A134D575106

In-Karst Hydrology

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

Note: Do not edit the polls (even for typos) once voting has started as it will reset the vote counts to zero. If a change needs to be made, make an annotation above the old poll (i.e., above the poll tags) and place the new poll below the first one.

For speleothem archives, should the karst residence time be:
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You are not entitled to view results of this poll.
There was one vote since the poll was created on 16:37, 24 April 2017.
poll-id 64563B7CDB324144A8D9FBADA9D25615

For speleothem archives, should the karst transit time distributions be:
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You are not entitled to view results of this poll.
There was one vote since the poll was created on 16:38, 24 April 2017.
poll-id 4BCFD5F68E45C6EE853624327C9252EB

For speleothem archives, should the karst porosity 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 16:38, 24 April 2017.
poll-id 99641FA39A2FC4ADA382E5C1CDBF45AC

For speleothem archives, should the karst rock overburden thickness 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 16:38, 24 April 2017.
poll-id F592E4CBC2CA4A11A80C95309BD9B60E

For speleothem archives, should the karst flow route type 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 16:38, 24 April 2017.
poll-id 41183E16E7033278E3816C078C0E2AF9

In-Cave

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

Note: Do not edit the polls (even for typos) once voting has started as it will reset the vote counts to zero. If a change needs to be made, make an annotation above the old poll (i.e., above the poll tags) and place the new poll below the first one.

For speleothem archives, should the in-cave temperature be:
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You are not entitled to view results of this poll.
There was one vote since the poll was created on 17:06, 24 April 2017.
poll-id 73D18C0253AA9D0FEFECB21E82869D01

For speleothem archives, should the in-cave humidity be:
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You are not entitled to view results of this poll.
There was one vote since the poll was created on 17:07, 24 April 2017.
poll-id 1B54C66A915951CD8E839747422EBBB1

For speleothem archives, should the in-cave pCO2 be:
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You are not entitled to view results of this poll.
There was one vote since the poll was created on 17:07, 24 April 2017.
poll-id B4622E50B02B1FF66F08401083AC28E4

For speleothem archives, should the in-cave drip-rate be:
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You are not entitled to view results of this poll.
There was one vote since the poll was created on 17:07, 24 April 2017.
poll-id 37F4D9DCB9EEB3F10327F52870B15B47

For speleothem archives, should the in-cave drip chemistry 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 17:07, 24 April 2017.
poll-id D996954AF5B11932F73EB4BD0075B9CF

References

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