{"NOAAStudyId":"17350","contactInfo":{"address":"325 Broadway, E/NE31","city":"Boulder","constraints":"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.","country":"USA","dataCenterUrl":"https://www.ncdc.noaa.gov/data-access/paleoclimatology-data","email":"paleo@noaa.gov","fax":"303-497-6513","longName":"National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce ","phone":"303-497-6280","postalCode":"80305-3328","shortName":"DOC/NOAA/NESDIS/NCEI","state":"CO","type":"CONTACT INFORMATION"},"contributionDate":"2014-10-19","dataPublisher":"NOAA","dataType":"PALEOLIMNOLOGY","dataTypeInformation":"https://www.ncdc.noaa.gov/data-access/paleoclimatology-data/datasets/lake","difMetadataLink":"http://www1.ncdc.noaa.gov/pub/data/metadata/published/paleo/dif/xml/noaa-lake-17350.xml","doi":null,"earliestYearBP":-50,"earliestYearCE":2000,"entryId":"noaa-lake-17350","funding":[{"fundingAgency":"US National Science Foundation","fundingGrant":"OCE0961697"}],"investigators":"Shanahan, T.M.; Hughen, K.A.; Van Mooy, B.","mostRecentYearBP":-50,"mostRecentYearCE":2000,"onlineResourceLink":"https://www.ncdc.noaa.gov/paleo/study/17350","originalSource":null,"publication":[{"abstract":"Understanding the causes and potential ecological and environmental impacts of recent and future temperature changes in the Arctic requires a better understanding of long term climate variability. Amongst the most promising new geochemical tools for sedimentary paleotemperature reconstructions are those based on the glycerol diakyl glycerol tetraethers (GDGTs). Although a number of studies have recently developed empirical calibrations for the temperature sensitivity of isoprenoid GDGTs (i.e., the TEX86 index) and the branched GDGTs (i.e., the MBT/CBT index) in mid and low latitude lakes, there is very little data from lakes in the Arctic. Here, we examine the temperature and environmental controls on GDGT abundances in a transect of small lakes (n = 59) distributed across Baffin Island in the eastern Canadian Arctic. Isoprenoid and branched GDGTs are ubiquitous in these lakes. The temperature control on the isoprenoid GDGT distributions is weak, although there is a significant relationship between the branched GDGT distributions and warm season temperature. Furthermore, published relationships developed between branched GDGTs and mean annual air temperatures in tropical lakes yield reconstructed temperatures from Arctic lakes that are consistent with Arctic summer air temperature. This suggests that empirical calibrations from branched GDGTs in lakes reflect the seasonality of branched GDGT production. For example, at low latitudes there is little seasonality in temperature, and branched GDGT production records air temperatures throughout the year. In the Arctic however, branched GDGTs are likely produced in summer, when the temperatures are warmest, sunlight hours are greatest and ice cover is diminished. Due to the extreme seasonality and short window of Arctic productivity, the use of branched GDGTs for summer paleotemperature reconstructions likely remains robust back through time. However, interpretations of paleotemperatures from branched GDGTs in temperate lakes may require careful consideration about potential changes in the seasonal timing of branched GDGT production.","author":{"name":"Timothy M. Shanahan, Konrad A. Hughen, Benjamin A.S. Van Mooy"},"citation":"Timothy M. Shanahan, Konrad A. Hughen, Benjamin A.S. Van Mooy. 2013. Temperature sensitivity of branched and isoprenoid GDGTs in Arctic lakes. Organic Geochemistry, 64, 119-128. doi: 10.1016/j.orggeochem.2013.09.010","edition":null,"identifier":{"id":"10.1016/j.orggeochem.2013.09.010","type":"doi","url":"http://dx.doi.org/10.1016/j.orggeochem.2013.09.010"},"issue":null,"journal":"Organic Geochemistry","pages":"119-128","pubRank":"1","pubYear":2013,"reportNumber":null,"title":"Temperature sensitivity of branched and isoprenoid GDGTs in Arctic lakes","type":"publication","volume":"64"}],"reconstruction":"N","scienceKeywords":null,"site":[{"NOAASiteId":"56315","geo":{"geoType":"Feature","geometry":{"coordinates":["62.112","73.042","-87.18","-62.17"],"type":"POLYGON"},"properties":{"easternmostLongitude":"-62.17","maxElevationMeters":null,"minElevationMeters":null,"northernmostLatitude":"73.042","southernmostLatitude":"62.112","westernmostLongitude":"-87.18"}},"locationName":"Continent>North America>Canada>Nunavut","mappable":"N","paleoData":[{"NOAADataTableId":"27605","coreLengthMeters":null,"dataFile":[{"NOAAKeywords":["earth science>paleoclimate>paleolimnology>geochemistry"],"fileUrl":"https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/canada/baffin/baffin2013gdgt.txt","linkText":"Surface Sediment Branched GDGT Data","urlDescription":"Data File","variables":[{"cvAdditionalInfo":null,"cvDataType":"PALEOLIMNOLOGY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":null,"cvWhat":"sampling metadata>sample identification"},{"cvAdditionalInfo":"crenarchaeol","cvDataType":"PALEOLIMNOLOGY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":"geological material>bulk geological material>sediment","cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"percent","cvWhat":"chemical composition>compound>organic compound>organic hydroxy compound>glycerol dialkyl glycerol tetraether>isoprenoid glycerol dialkyl glycerol tetraether"},{"cvAdditionalInfo":"crenarchaeol prime","cvDataType":"PALEOLIMNOLOGY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":"geological material>bulk geological material>sediment","cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"percent","cvWhat":"chemical composition>compound>organic compound>organic hydroxy compound>glycerol dialkyl glycerol tetraether>isoprenoid glycerol dialkyl glycerol tetraether"},{"cvAdditionalInfo":"Isoprenoid GDGT-0","cvDataType":"PALEOLIMNOLOGY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":"geological material>bulk geological material>sediment","cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"percent","cvWhat":"chemical composition>compound>organic compound>organic hydroxy compound>glycerol dialkyl glycerol tetraether>isoprenoid glycerol dialkyl glycerol tetraether"},{"cvAdditionalInfo":"Isoprenoid GDGT-1","cvDataType":"PALEOLIMNOLOGY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":"geological material>bulk geological material>sediment","cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"percent","cvWhat":"chemical composition>compound>organic compound>organic hydroxy compound>glycerol dialkyl glycerol tetraether>isoprenoid glycerol dialkyl glycerol tetraether"},{"cvAdditionalInfo":"Isoprenoid GDGT-2","cvDataType":"PALEOLIMNOLOGY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":"geological material>bulk geological material>sediment","cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"percent","cvWhat":"chemical composition>compound>organic compound>organic hydroxy compound>glycerol dialkyl glycerol tetraether>isoprenoid glycerol dialkyl glycerol tetraether"},{"cvAdditionalInfo":"Isoprenoid GDGT-3","cvDataType":"PALEOLIMNOLOGY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":"geological material>bulk geological material>sediment","cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"percent","cvWhat":"chemical composition>compound>organic compound>organic hydroxy compound>glycerol dialkyl glycerol tetraether>isoprenoid glycerol dialkyl glycerol tetraether"},{"cvAdditionalInfo":null,"cvDataType":"PALEOLIMNOLOGY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":"geological material>bulk geological material>sediment","cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"dimensionless","cvWhat":"chemical composition>compound>organic compound>organic compound index>tetraether index of 86 carbon atoms"},{"cvAdditionalInfo":null,"cvDataType":"PALEOLIMNOLOGY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":"geological material>bulk geological material>sediment","cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"dimensionless","cvWhat":"chemical composition>compound>organic compound>organic compound index>branched and isoprenoid tetraether index"},{"cvAdditionalInfo":"Branched GDGT-I","cvDataType":"PALEOLIMNOLOGY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":"geological material>bulk geological material>sediment","cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"percent","cvWhat":"chemical composition>compound>organic compound>organic hydroxy compound>glycerol dialkyl glycerol tetraether>branched glycerol dialkyl glycerol tetraether"},{"cvAdditionalInfo":"Branched GDGT-Ib","cvDataType":"PALEOLIMNOLOGY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":"geological material>bulk geological material>sediment","cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"percent","cvWhat":"chemical composition>compound>organic compound>organic hydroxy compound>glycerol dialkyl glycerol tetraether>branched glycerol dialkyl glycerol tetraether"},{"cvAdditionalInfo":"Branched GDGT-Ic","cvDataType":"PALEOLIMNOLOGY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":"geological material>bulk geological material>sediment","cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"percent","cvWhat":"chemical composition>compound>organic compound>organic hydroxy compound>glycerol dialkyl glycerol tetraether>branched glycerol dialkyl glycerol tetraether"},{"cvAdditionalInfo":"Branched GDGT-II","cvDataType":"PALEOLIMNOLOGY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":"geological material>bulk geological material>sediment","cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"percent","cvWhat":"chemical composition>compound>organic compound>organic hydroxy compound>glycerol dialkyl glycerol tetraether>branched glycerol dialkyl glycerol tetraether"},{"cvAdditionalInfo":"Branched GDGT-IIb","cvDataType":"PALEOLIMNOLOGY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":"geological material>bulk geological material>sediment","cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"percent","cvWhat":"chemical composition>compound>organic compound>organic hydroxy compound>glycerol dialkyl glycerol tetraether>branched glycerol dialkyl glycerol tetraether"},{"cvAdditionalInfo":"Branched GDGT-IIc","cvDataType":"PALEOLIMNOLOGY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":"geological material>bulk geological material>sediment","cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"percent","cvWhat":"chemical composition>compound>organic compound>organic hydroxy compound>glycerol dialkyl glycerol tetraether>branched glycerol dialkyl glycerol tetraether"},{"cvAdditionalInfo":"Branched GDGT-III","cvDataType":"PALEOLIMNOLOGY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":"geological material>bulk geological material>sediment","cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"percent","cvWhat":"chemical composition>compound>organic compound>organic hydroxy compound>glycerol dialkyl glycerol tetraether>branched glycerol dialkyl glycerol tetraether"},{"cvAdditionalInfo":"Branched GDGT-IIIb","cvDataType":"PALEOLIMNOLOGY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":"geological material>bulk geological material>sediment","cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"percent","cvWhat":"chemical composition>compound>organic compound>organic hydroxy compound>glycerol dialkyl glycerol tetraether>branched glycerol dialkyl glycerol tetraether"},{"cvAdditionalInfo":"Branched GDGT-IIIc","cvDataType":"PALEOLIMNOLOGY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":"geological material>bulk geological material>sediment","cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"percent","cvWhat":"chemical composition>compound>organic compound>organic hydroxy compound>glycerol dialkyl glycerol tetraether>branched glycerol dialkyl glycerol tetraether"},{"cvAdditionalInfo":null,"cvDataType":"PALEOLIMNOLOGY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":"geological material>bulk geological material>sediment","cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"dimensionless","cvWhat":"chemical composition>compound>organic compound>organic compound index>cyclization index of branched tetraethers"},{"cvAdditionalInfo":null,"cvDataType":"PALEOLIMNOLOGY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":"geological material>bulk geological material>sediment","cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"dimensionless","cvWhat":"chemical composition>compound>organic compound>organic compound index>methylation index of branched tetraethers"}]}],"dataTableName":"Baffin2013GDGT","dataTableNotes":null,"earliestYear":-50,"earliestYearBP":-50,"earliestYearCE":2000,"mostRecentYear":-50,"mostRecentYearBP":-50,"mostRecentYearCE":2000,"species":[],"timeUnit":"cal yr BP"}],"siteName":"Baffin Island Lakes"}],"studyCode":null,"studyName":"Baffin Island Lakes Surface Sediment Branched GDGT Data","studyNotes":"Calibration of the branched GDGT/temperature relationship \nfor lake surface sediments collected on Baffin Island, Arctic Canada.\nData include water temperature and water chemistry measurements for \n60 Baffin Island lakes, plus fractional abundances of iso- and br-GDGTs \nand calculated parameters (TEX86, BIT, MBT, CBT) for lake surface sediments.","version":"1.0","xmlId":"15039"}