noaa-lake-17367 Baffin Island Lakes Surface Sediment Leaf Wax Hydrogen Isotope Data Shanahan, T.M.; Hughen, K.A.; Ampel, L.; Sauer, P.E.; Fornace, K. Baffin Island Lakes Surface Sediment Leaf Wax Hydrogen Isotope Data 2014-10-19 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/17367 Investigator Shanahan, T.M. Investigator K.A. Hughen Investigator L. Ampel Investigator P.E. Sauer Investigator K. Fornace earth science paleoclimate paleolimnology sample identification,null,null,null,null,paleolimnology,null,null,N,null earth science paleoclimate instrumental delta 2H,lake water,unspecified margin of error,per mil,null,instrumental,null,null,N,Measured lake water stable isotope data is from Sauer (1997) earth science paleoclimate notes,null,null,null,null,,null,null,C,latitude designation earth science paleoclimate instrumental relative humidity,null,null,null,annual,instrumental,null,null,N,estimated from the NCEP Reanalysis dataset (Kalnay et al. 1996) earth science paleoclimate instrumental delta 2H apparent fractionation factor,null,null,per mil,null,instrumental,null,null,N,lake water vs precipitation earth science paleoclimate instrumental delta 18O,lake water,unspecified margin of error,per mil,null,instrumental,null,null,N,Measured lake water stable isotope data is from Sauer (1997) earth science paleoclimate paleolimnology longitude,null,null,degree east,null,paleolimnology,null,null,N,null earth science paleoclimate paleolimnology collection elevation,null,null,meter,null,paleolimnology,null,null,N,null earth science paleoclimate paleolimnology delta 2H,C28 n-alkanoic acid|C30 n-alkanoic acid,null,per mil VSMOW,null,paleolimnology,null,null,N,null earth science paleoclimate instrumental delta 2H,precipitation,unspecified margin of error,per mil,Jun-Sep,instrumental,null,null,N,computed from the Online Isotopes in Precipitation calculator (OIPC; Bowen and Revenaugh 2003) earth science paleoclimate instrumental relative humidity,null,null,null,Jun-Sep,instrumental,null,null,N,estimated from the NCEP Reanalysis dataset (Kalnay et al. 1996) earth science paleoclimate instrumental delta 18O,lake water,null,per mil,null,instrumental,null,null,N,Measured lake water stable isotope data is from Sauer (1997) earth science paleoclimate instrumental precipitation,null,null,millimeter,annual,instrumental,null,null,N,null earth science paleoclimate instrumental delta 2H,lake water,null,per mil,null,instrumental,null,null,N,Measured lake water stable isotope data is from Sauer (1997) earth science paleoclimate instrumental surface temperature,null,null,degree Celsius,annual,instrumental,null,null,N,null earth science paleoclimate paleolimnology latitude,null,null,degree north,null,paleolimnology,null,null,N,null earth science paleoclimate instrumental delta 2H,precipitation,null,per mil,Jun-Sep,instrumental,null,null,N,computed from the Online Isotopes in Precipitation calculator (OIPC; Bowen and Revenaugh 2003) earth science paleoclimate instrumental delta 2H apparent fractionation factor,null,null,per mil,null,instrumental,null,null,N,leaf wax C-28-C30 fatty acids vs precipitation; computed from OIPC dD data and average measured dDFA28-30 earth science paleoclimate paleolimnology hydrogen isotopes geoscientificInformation -50 cal yr BP -50 cal yr BP Complete 62.112 73.042 -87.18 -62.17 Continent North America Canada Nunavut Baffin Island Lakes>LATITUDE >LONGITUDE None 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. English DOC/NOAA/NESDIS/NCEI National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce https://www.ncdc.noaa.gov/data-access/paleoclimatology-data DATA Center Contact Bruce Bauer bruce.a.bauer@noaa.gov paleo@noaa.gov 303-497-6280 303-497-6513

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Boulder CO 80305-3328 USA online ASCII Timothy M. Shanahan, Konrad A. Hughen, Linda Ampel, Peter E. Sauer, Kyrstin Fornace 2013 Geochimica et Cosmochimica Acta 119 286-301 110.1016/j.gca.2013.05.032 http://www.sciencedirect.com/science/article/pii/S0016703713003190#MMCvFirst

The hydrogen isotope composition of plant waxes preserved in lacustrine sediments is a potentially valuable tool for reconstructing paleoenvironmental changes in the Arctic. However, in contrast to the mid- and low-latitudes, significantly less effort has been directed towards understanding the factors controlling D/H fractionation in high latitude plant waxes and the impact of these processes on the interpretation of sedimentary leaf wax dD records. To better understand these processes, we examined the D/H ratios of long chain fatty acids in lake surface sediments spanning a temperature and precipitation gradient on Baffin Island in the eastern Canadian Arctic. D/H ratios of plant waxes increase with increasing temperature and aridity, with values ranging from -240 per mil to -160 per mil over the study area. Apparent fractionation factors between n-alkanoic acids in Arctic lake sediments and precipitation (EFA-ppt) are less negative than those of mid-latitude lakes and modern plants by 25 per mil to 65 per mil, consistent with n-alkane data from modern Arctic plants (Yang et al., 2011). Furthermore, EFA-ppt values from Arctic lakes become systematically more positive with increasing evaporation, in contrast to mid-latitude sites, which show little to no change in fractionation with aridity. These data are consistent with enhanced water loss and isotope fractionation at higher latitude in the Arctic summer, when continuous sunlight supports increased daily photosynthesis. The dominant control on dDFA variations on Baffin Island is temperature. However, changing EFA-ppt result in steeper dDFA-temperature relationships than observed for modern precipitation. The application of this dDFA-based paleotemperature calibration to existing dDFA records from Baffin Island produces much more realistic changes in late Holocene temperature and highlights the importance of these effects in influencing the interpretation of Arctic dDFA records. A better understanding of the controls on hydrogen isotope fractionation in high latitude leaf waxes will be essential to the proper interpretation of isotope records from sedimentary plant waxes in the Arctic. STUDY NOTES: Hydrogen isotope (dD) data from Baffin Island lakes, including measurements made on surface sediment leaf waxes, lake water, and precipitation.

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/canada/baffin/baffin2013ddwax.txt Data File; Baffin Island Lakes Surface Sediment Leaf Wax dD Data USA/NOAA DIF Version 9.8.4 2018-12-11 2018-12-11