NOAA/WDS Paleoclimatology - Baffin Island Small Lakes Surface Sediment GDGT Data
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organisationName: NOAA World Data Service for Paleoclimatology
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title: NOAA/WDS Paleoclimatology - Baffin Island Small Lakes Surface Sediment GDGT Data
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date: 2009-07-01
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Anchor: DOI doi:10.25921/7b8w-gb89
identifier: (MD_Identifier)
code: noaa-lake-8758
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code: NCEI DSI 1200_02
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code: NCEI DSI 1200_01
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individualName: Hughen, K.A.
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individualName: Hughen, K.A.
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individualName: Van Mooy, B.
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individualName: Van Mooy, B.
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organisationName: NOAA National Centers for Environmental Information
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abstract: This archived Paleoclimatology Study is available from the NOAA National Centers for Environmental Information (NCEI), under the World Data Service (WDS) for Paleoclimatology. The associated NCEI study type is Lake. The data include parameters of instrumental with a geographic location of Nunavut, Canada. The time period coverage is from 0 to -50 in calendar years before present (BP). See metadata information for parameter and study location details. Please cite this study when using the data.
purpose: Records of past climate and environment derived from lake sediment records. Parameter keywords describe what was measured in this dataset. Additional summary information can be found in the abstracts of papers listed in the dataset citations.
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organisationName: NOAA World Data Service for Paleoclimatology
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country: USA
electronicMailAddress: paleo@noaa.gov
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fileName: https://www.ncei.noaa.gov/pub/data/paleo/webimages/pc-default-lake.png
fileDescription: Paleoclimatology - Lake
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descriptiveKeywords: (MD_Keywords)
keyword: Earth Science > Climate Indicators > Paleoclimate Indicators > Ocean/Lake Records
type: (MD_KeywordTypeCode) theme
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title: Global Change Master Directory (GCMD) Science Keywords
date: (CI_Date)
date: 2020-01-09
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edition: 9.1
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organisationName: NASA Goddard Space Flight Center, Earth Science Data and Information System
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keyword: earth science > paleoclimate > instrumental
keyword: earth science > paleoclimate > paleolimnology
keyword: earth science > paleoclimate > paleolimnology
keyword: earth science > paleoclimate > instrumental
keyword: earth science > paleoclimate > climate reconstructions|paleolimnology
keyword: earth science > paleoclimate > climate reconstructions|paleolimnology
keyword: earth science > paleoclimate > paleolimnology
keyword: earth science > paleoclimate > climate reconstructions|paleolimnology
keyword: earth science > paleoclimate > paleolimnology > geochemistry
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keyword: What: temperature; Material: null
keyword: What: mass; Material: null
keyword: What: branched and isoprenoid tetraether index; Material: sediment
keyword: What: pH; Material: null
keyword: What: surface air temperature; Material: glycerol dialkyl glycerol tetraether index
keyword: What: pH; Material: glycerol dialkyl glycerol tetraether index|soil
keyword: What: sample identification; Material: null
keyword: What: surface air temperature; Material: glycerol dialkyl glycerol tetraether index
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descriptiveKeywords: (MD_Keywords)
keyword: Continent > North America > Canada > Nunavut > Baffin Island Small Lakes > LATITUDE 69 > LONGITUDE -69
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keyword: DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
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date: 2020-01-09
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linkage: https://www.earthdata.nasa.gov/learn/find-data/idn/gcmd-keywords
name: Global Change Master Directory (GCMD) Keywords
description: The information provided on this page seeks to define how the GCMD Keywords are structured, used and accessed. It also provides information on how users can participate in the further development of the keywords.
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otherConstraints: Cite as: Hughen, K.A.; Van Mooy, B. (2009-07-01): NOAA/WDS Paleoclimatology - Baffin Island Small Lakes Surface Sediment GDGT Data. [indicate subset used]. NOAA National Centers for Environmental Information. https://doi.org/10.25921/7b8w-gb89. Accessed [date].
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otherConstraints: Distribution liability: NOAA and NCEI make no warranty, expressed or implied, regarding these data, nor does the fact of distribution constitute such a warranty. NOAA and NCEI cannot assume liability for any damages caused by any errors or omissions in these data. If appropriate, NCEI can only certify that the data it distributes are an authentic copy of the records that were accepted for inclusion in the NCEI archives.
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otherConstraints: Use liability: NOAA and NCEI cannot provide any warranty as to the accuracy, reliability, or completeness of furnished data. Users assume responsibility to determine the usability of these data. The user is responsible for the results of any application of this data for other than its intended purpose.
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otherConstraints: Please cite original publication, online resource, dataset and publication DOIs (where available), and date accessed when using downloaded data. If there is no publication information, please cite investigator, title, online resource, and date accessed. The appearance of external links associated with a dataset does not constitute endorsement by the Department of Commerce/National Oceanic and Atmospheric Administration of external Web sites or the information, products or services contained therein. For other than authorized activities, the Department of Commerce/NOAA does not exercise any editorial control over the information you may find at these locations. These links are provided consistent with the stated purpose of this Department of Commerce/NOAA Web site.
language: eng; USA
topicCategory: (MD_TopicCategoryCode) geoscientificInformation
extent: (EX_Extent)
description: Date Range: 0 cal yr BP to -50 cal yr BP;
geographicElement: (EX_GeographicBoundingBox)
westBoundLongitude: -69
eastBoundLongitude: -69
southBoundLatitude: 69
northBoundLatitude: 69
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description: Study Coordinates
pos: 69 -69
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TimePeriod:
beginPosition: 1950
endPosition: 2000
supplementalInformation: STUDY NOTES: The GDGTs (glycerol dialkyl glycerol tetraethers) in sediments from 71 Arctic lakes were measured for quantitative concentration values using synthesized GDGT standards at known concentrations. ABSTRACT SUPPLIED BY ORIGINATOR: The GDGTs (glycerol dialkyl glycerol tetraethers) in sediments from 71 Arctic lakes were measured for quantitative concentration values using synthesized GDGT standards at known concentrations. Each sample was measured in duplicate with uncertainties of only ±1ºC in the TEX86 temperature proxy and ±0.01 in the BIT terrestrial proxy. A comparison of calculated TEX86 proxy temperatures to instrumental data showed no correlation to lake surface temperature (LST) or January, July or mean annual air temperature. TEX86 versus instrumental LST yielded a correlation r2 of only .02, and TEX86 versus instrumental air temperature yielded no correlations as well (r2 of -.06, .09 and -.0006 for mean annual, Jan and July air temperature, respectively). These results were not entirely unanticipated, as TEX86 has been shown to be problematic when applied to nearshore marine sites or small lakes with significant terrestrial input. Therefore, in addition to TEX86, we investigated a number of alternate indices based on average number of ring structures, or ratios of highest-to-lowest ring number, within the suite of GDGT compounds. These alternate indices were calculated for various combinations of ring number, including isolation of the compounds found at highest or lowest concentrations. For each of these alternate 'ring number' indices, there was no significant correlation to instrumental lake surface or average air temperature. The different temperature indices show no correlation to LST for these small lakes, and suggest that reconstructing water temperature with aquatic GDGTs from small, shallow Arctic lakes will not be a practical approach. Non-isoprenoidal GDGTs, primarily produced by soil microbes, are particularly abundant in the Arctic lakes we sampled. BIT values for the 71 Arctic lakes we investigated averaged 0.93, indicating a very high contribution of terrestrial organic matter to these lakes. This is an expected result, as these samples came from relatively small and shallow lakes, and further supports the lack of a strong correlation between TEX temperature indices and LST. Although in preliminary data based on 10 samples the BIT values showed a strong anticorrelation to mean annual precipitation (r2 = -.76), the final results on all 71 lake samples showed a much weaker relationship (r2 = -.23). For mean July precipitation, the correlation is weakest (r2=-.01), whereas for January the relationship is similar to annual precipitation (r2 = -.21). The BIT index in these lakes appears to be dominated by amount of winter snowpack, with an inverse relationship such that lower snowpack equals greater runoff of terrestrial GDGTs into the lakes. To test whether snowpack melt is related to the BIT index, we compared BIT to July air temperature, but found no relationship (r2 = -.03). Comparing BIT values to other parameters potentially linked to runoff also failed to yield any significant correlations (BIT vs transmissivity, r2 = -.02; BIT vs salinity, r2 = -.00003; BIT vs max depth, r2 = .0003). These BIT results indicate some success in developing a precipitation proxy for use in small Arctic lakes. However, the anticorrelation of BIT with mean annual precipitation is striking, as it is opposite what has been found previously, where BIT in river deltas and near-shore marine settings is positively correlated with river runoff. In addition, the correlation with January rather than July precipitation precludes a simple interpretation such as the hypothesis that for small Arctic lake catchments, the flux of terrestrial matter is controlled by the effect of aridity on increased erodability of peaty soils and tundra. Instead, the anticorrelation with only winter precipitation implies a potential protective effect of the snowpack, preventing soil erosion and runoff when the snowpack is larger. Nevertheless, any relationship between BIT and precipitation in Arctic lakes is complex, and the low degree of variance explained (~23%) suggests that the relationship may not be robust.
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maintenanceNote: This ISO metadata record was translated from DIF metadata using dif-9x-to-iso-19115-2.xsl Version: 2022-06-21
