Difference between revisions of "Category:Marine Sediment Working Group"
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Revision as of 18:00, 17 March 2017
Contents
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 marine sedimentary archives (see this page for a definition of Marine Sediment Archive), and aims to formulate a set of recommendations for such a standard.
Members
The group currently has one coordinator, Julie Richey (USGS)
Members of 'Marine Sediment Working Group'
This working group has 16 members.
Specific tasks
We recommend that discussions focus on the following considerations, and explore potential commonalities.
For each observation type, we recommend:
- structuring discussions around what scientific questions one would want to ask of the data
- listing essential, recommended, and optional 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?)
- providing an ideal data table, so the community knows what to report and how to report it.
- providing separate recommendations for new and legacy datasets, and for how to label measured and inferred variable (e.g. Mg/Ca is measured, temperature is inferred)
- thinking about how the rest of the paleoscience community, or other (non)scientists may make use of the data you describe.
Marine sediments are a very ubiquitous archive on which many types of observations are made, and involving thousands of people around the world. It seems wise for this WG to rally around sub-groups start dedicated to data standards about the following sensors/observation types.
Previous standardization efforts
A discussion regarding paleoclimate data standards was started during the PMIP Ocean Workshop: Understanding changes since the Last Glacial Maximum (hereafter, PMIP_LGM) in Corvallis, OR in December 2013. Given the expertise of the working group members, the discussion focus on sedimentary archives. Meeting notes can be found here and summarized in the sections below.
The recommendations made at the workshop concerned new datasets only. It was recognized that different sets of standards would be necessary for legacy datasets.
Types of Data
There are three principle types of data that are relevant for the paleoceanography/paleoclimatology community:
Original data values
this would include raw values of all variables measured or otherwise determined on the substrate of interest, recorded against an unambiguous sample identifier (for instance, depth in the archive). This includes age control points (ACP) used to derive the age model of the paleo-time series, including radioisotopes (14C, excess 210Pb), and benthic stack comparison. All data that are reported for the first time in a scientific publication should be treated as original. The procedure of obtaining original data should be documented such as to allow full replication of the results. In the LinkedEarth Ontology, the original data values are referred as Category:MeasuredVariable_©.
Should the "unique sample identifier" identified at the PMIP_LGM workshop be:
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There were 7 votes since the poll was created on 23:13, 7 March 2017.
poll-id 36C56A4F3693990E0936AB6AC7F8F158
At the PMIP_LGM workshop, it was proposed that the unique sample identifier consists of the name, geographical coordinates, water depth of the sediment core in addition to the position of the analyses sediment segment in the core. Is this labelling:
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There were 7 votes since the poll was created on 23:27, 7 March 2017.
poll-id 14714BE25ABC4C1A7B14ED87FE6B20B1
Depth can be problematic as a unique identifier since there are several to calculate or report depth in a sample (i.e., top-depth, mid-depth, depth interval.) and IODP uses several depth scales.
In the case where depth is reported for sediment cores, should we report:
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There were 6 votes since the poll was created on 23:16, 7 March 2017.
poll-id 27DAE87F3370E83700CE16B6457F9284
Deborah Khider (talk) 15:29, 7 March 2017 (PST): I probably forgot ways of expressing depth, please add comments below.
Derived data values
this category refers to values of variables derived from other variables, derived or raw, original or compiled, reported against an unambiguous sample identifier and accompanied with a documentation of the derivation procedure such as to allow full replication of the result. This category includes algorithms of any kind relating depth to age that have been used to assign ages to values of raw or derived variables. In the LinkedEarth Ontology, derived data values are referred to as Category:InferredVariable_©.
The derivation procedure is contained in the Category: CalibrationModel_©.
For marine sediment cores, should the calibration model be:
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There were 7 votes since the poll was created on 00:30, 8 March 2017.
poll-id 7C4AE17FE47EA87830F1BA07B51F59C9
Should the code used in the calibration of marine sedimentary records be:
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There were 8 votes since the poll was created on 00:30, 8 March 2017.
poll-id AB5F5404199B91D8313625A32343B5A2
Should the calibration Publication information be:
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There were 7 votes since the poll was created on 19:44, 8 March 2017.
poll-id 32117782905226D0ADDA2F1557EA3F92
Compilation of data values
this refers to raw values of all variables from published sources, gathered for the purpose of quantitative treatment, recorded against an unambiguous sample identifier and labelled with an unambiguous reference to the publication where such data were originally presented. Reporting of data compilations is required wherever these are used to derive patterns or variables from the data other than those reported in the original publication.
Should compilation of previous work involving marine sediment records report:
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There were 8 votes since the poll was created on 00:31, 8 March 2017.
poll-id 54ACE3242CF87B5F02B413BD62B72E8D
LinkedEarth identifies each series using Property:hasID_©
Archiving
The following recommendations were made at the PMIP_LGM workshop:
The data should be archived in easily accessible database administered by an editorial board. The database should included on on-line system for (1) the reporting of errors, (2) a community-driven quality flag system, and (3) the update of datasets as new data become available. Updates to a particular dataset should be assigned a version number with a link to the old and new references. The editorial board should also be tasked in identifying and archiving older datasets.
For versioning of datasets, see the proposed LinkedEarth standard here and use the Discussion page to comment.
Marine Sediment Standards
| Metadata | Essential (E)/ Recommended (R) / Desired (D) | Reason | Added by (optional) |
|---|---|---|---|
| Collection Method: Gear Type | D | Some coring techniques are known to stretch/compress the cores (i.e. Marion Dufresne piston core) | Deborah Khider (talk) 16:17, 7 March 2017 (PST) |
| Collection method: Volume of sediment analyzed | D | May not be useful for all types of data measured on sediment cores. If deemed recommend or essential, insert comment/poll in appropriate section | Deborah Khider (talk) 16:17, 7 March 2017 (PST) |
| Collection method: Sampling methods | D | u-channel, syringe, slice | Deborah Khider (talk) 16:17, 7 March 2017 (PST) |
| Instrumentation | D | How were the MeasuredVariables measured? Desired for standard analytical techniques. Should be essential/recommended for new techniques | Deborah Khider (talk) 16:23, 7 March 2017 (PST) |
For marine sediments, the gear type used for the collection of the archive should be:
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There were 5 votes since the poll was created on 18:00, 17 March 2017.
poll-id 7DC5CE9086A322329E11688B7BC1D130
For studies based on marine sediments, should the volume of sediment analyzed be:
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There were 5 votes since the poll was created on 18:00, 17 March 2017.
poll-id B7C3AB70BF578DC1DD84577B9927261C
For marine sediment studies, should the instrument used for standard analytical techniques be:
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There were 5 votes since the poll was created on 18:00, 17 March 2017.
poll-id 4ADE31D2B4F457D8E7F252760213ACF7
For marine sediment studies, should the instrument used in new protocols be:
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There were 4 votes since the poll was created on 18:00, 17 March 2017.
poll-id D90ACBF4A9DE1C00F457763F37E748C2
Geochemical Data
Foraminiferal Geochemistry
For foraminiferal geochemistry work, should information about the taxonomy being followed on top of the genus/species information be:
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There were 4 votes since the poll was created on 00:25, 8 March 2017.
poll-id 0A5106C96F47C17DC1B065830CA5D1B6
Stable isotopes
In the following table, enter the metadata that you'd wish every member of the stable isotope community would enter to make their data reproducible. To add more lines, follow this guide. For a definition of Essential (E)/ Recommended (R)/ Desired (D), see this page.
| Metadata | Essential (E)/ Recommended (R) / Desired (D) | Reason | Added by (optional) |
|---|---|---|---|
| Category: Location_© (Lat, Lon) | E | Location is a must | Kau (talk) 13:34, 7 March 2017 (PST) |
| Property:Wgs84:Alt © (Depth) | R | Especially for deep-sea drilling sediments, water depths can be important to assess various biogeochemical properties and parameters of stable isotopic parameters | Kau (talk) 13:34, 7 March 2017 (PST) |
| Property:SensorGenus_© Property:SensorSpecies_© | E | Species information needed to infer which section of the water column is being recorded | Kau (talk) 13:34, 7 March 2017 (PST) |
| Cleaning Methodology | R | Useful to correct for offsets, especially for compilation work although a quick plot can often help figure out the cleaning methodology | Kau (talk) 13:34, 7 March 2017 (PST) |
| Sample Depth | E | Positional information needed to relate the samples back to the archive | Kau (talk) 13:34, 7 March 2017 (PST) |
| ChonDataTable | E for new datasets/ R for legacy datasets | The raw radiocarbon, tie points, 210Pb measurements should be made available so that age models can be updated in light of new calibration curves or new age modeling techniques | Kau (talk) 13:34, 7 March 2017 (PST) |
| Number of specimens utilized per sample | R | The number of foraminiferal tests used per sample can be used to understand the sampling uncertainity associated with the measurements based on the signal-to-noise ratio of the climate signal at the location (planktic foraminifera live for 2-4 weeks) | Kau (talk) 13:34, 7 March 2017 (PST) |
| Property:Standard © | E | The standard against which the measurements are reported (especially for d18O). VBDP vs VSMOW | Deborah Khider (talk) 13:41, 7 March 2017 (PST) |
| Analytical Precision | R | The machine precision based on reproducability of standards | Kau (talk) 13:49, 7 March 2017 (PST) |
| Size Fraction | R | Stable isotopes ratios have been shown to vary by size fraction in several studies | Deborah Khider (talk) 15:48, 7 March 2017 (PST) |
| Method of sediment disintegration and washing | D | Brought up at the PMIP_LGM meeting | Deborah Khider (talk) 16:19, 7 March 2017 (PST) |
| Correction applied/Equilibration offset | R | For instance, correction for offsets in benthic species (critical for compilation work) | Deborah Khider (talk) 16:27, 7 March 2017 (PST) |
| Seasonality | R | Necessary for compilation work especially as to not combine summer and winter ProxySensors | Deborah Khider (talk) 11:39, 8 March 2017 (PST) |
| Habitat Depth | R | Which part of the water column is being represented | Deborah Khider (talk) 11:39, 8 March 2017 (PST) |
To gather rapid feedback on whether the proposed metadata should be essential, recommended or optional, answer the polls below:
For stable isotopes in foraminifera, should the location information (and water depth) be:
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There were 6 votes since the poll was created on 21:45, 7 March 2017.
poll-id 45FF02339429C6C462C391EC3CEE963C
For stable isotopes in foraminifera, should the sensor genus/species information be:
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There were 5 votes since the poll was created on 21:45, 7 March 2017.
poll-id F4DAE98FBB4889111B360750A225B6C6
For stable isotopes in foraminifera, should the depth (position of the measurement in the archive) information be:
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There were 6 votes since the poll was created on 21:45, 7 March 2017.
poll-id 9C0329A43D83FE74AB4BBFAF34E3676B
For stable isotopes in foraminifera, should the ChonMeasurementTable information be:
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There were 4 votes since the poll was created on 21:45, 7 March 2017.
poll-id 9E1154CAC198A5C2E9756598EC5FB134
For stable isotopes in foraminifera, should the numbers of specimens utilized be:
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There were 4 votes since the poll was created on 21:45, 7 March 2017.
poll-id E46F4CC0B5B309E1DD2E2019C99AD8E2
For stable isotopes in foraminifera, should the property standard reported be:
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There were 4 votes since the poll was created on 21:52, 7 March 2017.
poll-id 2F10B4A70435835B8464A443435D56CF
For stable isotopes in foraminifera, should the analytical precision reported be:
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There were 4 votes since the poll was created on 21:52, 7 March 2017.
poll-id E198E4FAF1A9E8358CE0BBA841C3BA4F
For stable isotopes in foraminifera, should size fraction be:
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There were 4 votes since the poll was created on 23:48, 7 March 2017.
poll-id 8ED5D3D55F5D5E0D577F05470CA3D485
For stable isotopes in foraminifera, should the method of sediment disintegration be:
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There were 4 votes since the poll was created on 19:37, 8 March 2017.
poll-id C03DF076795FD835C666874277A553FB
For stable isotopes in foraminifera, should the applied correction/equilibrium offset be:
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There were 4 votes since the poll was created on 19:38, 8 March 2017.
poll-id 4597E75365B81B5AB6E810309E50C28D
For stable isotopes in foraminifera, should the seasonality be:
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There were 5 votes since the poll was created on 19:38, 8 March 2017.
poll-id AE66893582EBBE5745D27A2288FAAB06
For stable isotopes in foraminifera, should the habitat depth be:
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There were 5 votes since the poll was created on 19:38, 8 March 2017.
poll-id E463DF6713337347458F54AECA2080C7
Trace Metals
Mg/Ca
In the following table, enter the metadata that you'd wish every member of the Mg/Ca community would enter to make their data reproducible. To add more lines, follow this guide. For a definition of Essential (E)/ Recommended (R)/ Desired (D), see this page.
| Metadata | Essential (E)/ Recommended (R) / Desired (D) | Reason | Added by (optional) |
|---|---|---|---|
| Category: Location_© (Lat, Lon) | E | Location is a must | Deborah Khider (talk) 12:37, 17 February 2017 (PST) |
| Property:Wgs84:Alt © (Depth) | E | Water depth can be useful to get an idea of dissolution in the core. Especially for deep-sea drilling sediments, water depths can be important to assess various biogeochemical properties and parameters of stable isotopic parameters | Kau (talk) 13:39, 7 March 2017 (PST) |
| Property:SensorGenus_© Property:SensorSpecies_© | E | Species information needed to infer which section of the water column is being recorded | Deborah Khider (talk) 12:37, 17 February 2017 (PST) |
| Cleaning Methodology | R | Useful to correct for offsets, especially for compilation work although a quick plot can often help figure out the cleaning methodology | Deborah Khider (talk) 12:37, 17 February 2017 (PST) |
| Sample Depth | E | Positional information needed to relate the samples back to the archive | Deborah Khider (talk) 12:37, 17 February 2017 (PST) |
| ChonDataTable | E for new datasets/ R for legacy datasets | The raw radiocarbon, tie points, 210Pb measurements should be made available so that age models can be updated in light of new calibration curves or new age modeling techniques | Deborah Khider (talk) 12:37, 17 February 2017 (PST) |
| Number of specimens utilized per sample | R | The number of foraminiferal tests used per sample can be used to understand the sampling uncertainity associated with the measurements based on the signal-to-noise ratio of the climate signal at the location (planktic foraminifera live for 2-4 weeks) | Kau (talk) 13:17, 7 March 2017 (PST) |
| Analytical Precision | D | Uncertainty in the measurements | Deborah Khider (talk) 13:51, 7 March 2017 (PST) |
| Size fraction | R | Mg/Ca and other trace element ratios have been shown to vary with specimens size | Deborah Khider (talk) 15:49, 7 March 2017 (PST) |
| Method of sediment disintegration and washing | D | Brought up at the PMIP_LGM workshop | Deborah Khider (talk) 16:20, 7 March 2017 (PST) |
| Correction applied/Equilibrium offset | R | For instance, correction for offsets for cleaning methodologies (critical for compilation work) | Deborah Khider (talk) 16:27, 7 March 2017 (PST) |
| Seasonality | R | Necessary for compilation work especially as to not combine summer and winter ProxySensors | Deborah Khider (talk) 11:39, 8 March 2017 (PST) |
| Habitat Depth | R | Which part of the water column is being represented | Deborah Khider (talk) 11:39, 8 March 2017 (PST) |
| Contamination indicators | R | Ancillary trace element data to asses contamination (e.g. Al/Ca, Mn/Ca, Fe/Ca) | William Gray (talk) 17:12, 17 March 2017 (GMT) |
| Property:Standard © | D | The value of any certified reference material analysed by the lab (e.g. ECRM 752-1) | William Gray (talk) 17:24, 17 March 2017 (GMT) |
To gather rapid feedback on whether the proposed metadata should be essential, recommended or optional, answer the polls below:
For Mg/Ca in foraminifera, should the location information (especially in relation to water depth) be:
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There were 5 votes since the poll was created on 21:26, 7 March 2017.
poll-id 30B1E1BEA2083F7429E59527F2DBF8A8
For Mg/Ca in foraminifera, should the sensor genus/species information be:
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There were 5 votes since the poll was created on 21:26, 7 March 2017.
poll-id 036FE79A6C27842348B489B982D516D8
Should the cleaning methodology be considered:
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There were 7 votes since the poll was created on 20:07, 7 November 2016.
poll-id 5D88039254CA2FE4746A7A2515CDDBCA
For Mg/Ca in foraminifera, should the depth (position of the measurement in the archive) information be:
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There were 5 votes since the poll was created on 21:26, 7 March 2017.
poll-id 5E204D0FB2EBB8A0B8A78A229261EC4E
For Mg/Ca in foraminifera, should the ChonMeasurementTable information be:
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There were 5 votes since the poll was created on 21:26, 7 March 2017.
poll-id 40ECF6DB8C722909F39479BD19C3F2CD
For Mg/Ca in foraminifera, should the numbers of specimens utilized be:
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There were 4 votes since the poll was created on 21:46, 7 March 2017.
poll-id 9D1700879FA581737C1F779C8C0BAB9E
For Mg/Ca in foraminifera, should the analytical precision reported be:
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There were 4 votes since the poll was created on 23:49, 7 March 2017.
poll-id E59628A325A1D182243A5EAF06D70679
For Mg/Ca in foraminifera, should the size fraction be:
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There were 4 votes since the poll was created on 23:49, 7 March 2017.
poll-id 775A08139E4A98D799AA31AA05C7D200
For Mg/Ca in foraminifera, should the method of sediment disintegration be:
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There were 4 votes since the poll was created on 19:39, 8 March 2017.
poll-id 5CEF1475190DAD116F1B4CBC88281438
For Mg/Ca in foraminifera, should the applied correction/equilibrium offset be:
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There were 3 votes since the poll was created on 19:39, 8 March 2017.
poll-id B2D384EDF4B84E02B35DD8B24FDF2109
For Mg/Ca in foraminifera, should the seasonality be:
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There were 4 votes since the poll was created on 19:39, 8 March 2017.
poll-id C43DEA2CB3276A48B899AC1C0AF4204A
For Mg/Ca in foraminifera, should the habitat depth be:
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There were 4 votes since the poll was created on 19:39, 8 March 2017.
poll-id BB59D36FDAEE93B0CE37426CD39AA9A2
For Mg/Ca in foraminifera, should contamination indicators (Al/Ca, Mn/Ca, Fe/Ca) be:
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There were 4 votes since the poll was created on 17:05, 17 March 2017.
poll-id A8E7999FB8F8C9C39260BE14FD789CA5
Boron isotopes
In the following table, enter the metadata that you'd wish every member of the stable isotope community would enter to make their data reproducible. To add more lines, follow this guide. For a definition of Essential (E)/ Recommended (R)/ Desired (D), see this page.
| Metadata | Essential (E)/ Recommended (R) / Desired (D) | Reason | Added by (optional) |
|---|---|---|---|
| Category: Location_© (Lat, Lon) | E | Location is a must | William Gray (talk) 17:29, 17 March 2017 (GMT) |
| Property:Wgs84:Alt © (Depth) | R | Water depth is essential for benthic foraminferal data | William Gray (talk) 17:29, 17 March 2017 (GMT) |
| Property:SensorGenus_© Property:SensorSpecies_© | E | Planktonic species show different relationships to d11B of borate | William Gray (talk) 17:29, 17 March 2017 (GMT) |
| Sample Depth | E | Positional information needed to relate the samples back to the archive | William Gray (talk) 17:29, 17 March 2017 (GMT) |
| ChonDataTable | E for new datasets/ R for legacy datasets | The raw radiocarbon, tie points, 210Pb measurements should be made available so that age models can be updated in light of new calibration curves or new age modeling techniques | William Gray (talk) 17:29, 17 March 2017 (GMT) |
| Analytical Method | E | The analytical method used for seperation (e.g. Amberlite columns, micro sublimation ) and analysis (MC-ICP-MS, NTIMS) | William Gray (talk) 17:29, 17 March 2017 (GMT) |
| Sample size | R | ng of Boron analysed | William Gray (talk) 17:29, 17 March 2017 (GMT) |
| Property:Standard © | E | The values for certified reference materials analysed (e.g. JCP, JCT, AE121) | William Gray (talk) 17:29, 17 March 2017 (GMT) |
| Analytical precision | E | Precision based on reproducibility of standards, may be a function of sample size | William Gray (talk) 17:29, 17 March 2017 (GMT) |
Organic Geochemistry
Alkenones
GDGTs
Should raw peak areas (as opposed to just TEX86 index) be:
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There were 4 votes since the poll was created on 19:20, 21 November 2016.
poll-id 661DF66A537B28E6EBFFACB0E845D584
Compound specific isotopes
Physical Data
Grain Size
Micropaleontological Data
- Report raw counts if available. If not available, then at least report minimum number of specimens counted
- Minimum number of specimens counted
- Size fraction
If the data were used to infer temperature or sea ice concentration, then the method (MAT, WA-PLS, etc) and the training set should be mentioned/required metadata.
For Micropaleontological Data , should raw counts be:
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There were 3 votes since the poll was created on 23:53, 7 March 2017.
poll-id 7A33C91948DB228ECA30F04A172545F2
For Micropaleontological Data , should the number of specimens counted be:
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There were 3 votes since the poll was created on 23:53, 7 March 2017.
poll-id C9A7C884503C82BD1523BC97FF29A258
For Micropaleontological Data, should size fraction be:
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There were 3 votes since the poll was created on 23:54, 7 March 2017.
poll-id 6DB2FF5E82BDB47B27497680D9290BEE
For Micropaleontological Data, should the seasonality be:
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There were 3 votes since the poll was created on 19:27, 8 March 2017.
poll-id 93117ECF8F1D6DB124852051416FE405
For Micropaleontological Data, should the habitat depth be:
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There were 3 votes since the poll was created on 19:27, 8 March 2017.
poll-id 6E4C094C8B33C461F680E659DE4F5A65
Pages in category "Marine Sediment Working Group"
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