Baffin Island Lakes Surface Sediment Leaf Wax Hydrogen Isotope Data Shanahan, T.M.; Hughen, K.A.; Ampel, L.; Sauer, P.E.; Fornace, K. Shanahan, T.M. Hughen, K.A. Ampel, L. Sauer, P.E. Fornace, K. 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 (Baffin Island Lakes>LATITUDE >LONGITUDE ) 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. NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Shanahan, T.M. Investigator : Hughen, K.A. Investigator : Ampel, L. Investigator : Sauer, P.E. Investigator : Fornace, K. 2014-10-19 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/17367 https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/canada/baffin/baffin2013ddwax.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/canada/baffin/baffin2013ddwax.txt English https://www.ncdc.noaa.gov/paleo/study/17367 https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/canada/baffin/baffin2013ddwax.txt Timothy M. Shanahan, Konrad A. Hughen, Linda Ampel, Peter E. Sauer, Kyrstin Fornace2013Environmental controls on the 2H/1H values of terrestrial leaf waxes in the eastern Canadian ArcticGeochimica et Cosmochimica Acta119286-301110.1016/j.gca.2013.05.032http://www.sciencedirect.com/science/article/pii/S0016703713003190#MMCvFirst START YEAR: -50 cal yr BP * END YEAR: -50 cal yr BP -87.18 62.112 -62.17 73.042