Flower Valley Lake, Southeast Greenland 8800 Year Biogeochemical Data Balascio, N.L.; D'Andrea, W.J.; Bradley, R.S.; Perren, B. Balascio, N.L. D'Andrea, W.J. Bradley, R.S. Perren, B. earth science/paleoclimate/paleolimnology (C23 n-alkane,null,null,microgram per gram,null,paleolimnology,null,gas chromatography - flame ionization detection,N,null) earth science/paleoclimate/paleolimnology (delta 2H,C25 n-alkane,null,per mil VSMOW,null,paleolimnology,null,isotope ratio mass spectrometry,N,null) earth science/paleoclimate/paleolimnology (depth,null,null,centimeter,null,paleolimnology,null,null,N,null) earth science/paleoclimate/paleolimnology (C21 n-alkane,null,null,microgram per gram,null,paleolimnology,null,gas chromatography - flame ionization detection,N,null) earth science/paleoclimate/paleolimnology (delta 2H,C27 n-alkane,null,per mil VSMOW,null,paleolimnology,null,isotope ratio mass spectrometry,N,null) earth science/paleoclimate/paleolimnology (delta 2H,null,null,per mil VSMOW,null,paleolimnology,null,null,N,Apparent fractionation value of lake water derived lipids (aq) from precipitation (p)) earth science/paleoclimate/paleolimnology (carbon preference index,null,null,dimensionless,null,paleolimnology,null,null,N,null) earth science/paleoclimate/paleolimnology (C27 n-alkane,null,null,microgram per gram,null,paleolimnology,null,gas chromatography - flame ionization detection,N,null) earth science/paleoclimate/paleolimnology (C31 n-alkane,null,null,microgram per gram,null,paleolimnology,null,gas chromatography - flame ionization detection,N,null) earth science/paleoclimate/paleolimnology (C33 n-alkane,null,null,microgram per gram,null,paleolimnology,null,gas chromatography - flame ionization detection,N,null) earth science/paleoclimate/paleolimnology (delta 13C,organic matter,null,per mil VPDB,null,paleolimnology,null,isotope ratio mass spectrometry,N,null) earth science/paleoclimate/paleolimnology (C25 n-alkane,null,null,microgram per gram,null,paleolimnology,null,gas chromatography - flame ionization detection,N,null) earth science/paleoclimate/paleolimnology (C29 n-alkane,null,null,microgram per gram,null,paleolimnology,null,gas chromatography - flame ionization detection,N,null) earth science/paleoclimate/paleolimnology (delta 2H,C31 n-alkane,null,per mil VSMOW,null,paleolimnology,null,isotope ratio mass spectrometry,N,null) earth science/paleoclimate/paleolimnology (carbon/nitrogen,sediment,null,dimensionless,null,paleolimnology,null,elemental analysis,N,null) earth science/paleoclimate/paleolimnology (volume magnetic susceptibility,sediment,null,dimensionless (SI system),null,paleolimnology,null,magnetic susceptibility measurement with point or surface sensor,N,x10-6 units) earth science/paleoclimate/paleolimnology (age,null,null,calendar year before present,null,paleolimnology,null,null,N,null) earth science/paleoclimate/paleolimnology (average chain length,n-alkane,null,count,null,paleolimnology,null,null,N,null) earth science/paleoclimate/paleolimnology (delta 2H,C29 n-alkane,null,per mil VSMOW,null,paleolimnology,null,isotope ratio mass spectrometry,N,null) earth science/paleoclimate/paleolimnology (organic carbon,sediment,null,percent,null,paleolimnology,null,elemental analysis,N,null) earth science/paleoclimate/paleolimnology earth science/paleoclimate/paleolimnology earth science/paleoclimate/paleolimnology earth science/paleoclimate/paleolimnology (Flower Valley Lake>LATITUDE 65.6107>LONGITUDE -37.6935) Holocene paleoclimate records from Greenland help us understand the response of the Greenland Ice Sheet and regional oceanic and atmospheric circulation systems to natural climate variability in order to place recent changes in a longer-term perspective. Here biogeochemical analysis of a lake sediment core from southeast Greenland is used to define changes in moisture balance and runoff during the Holocene in a catchment near the margin of the Greenland Ice Sheet. A 1.6-m sediment core that spans the last 8.8 ka was recovered from Flower Valley Lake on Ammassalik Island. Magnetic susceptibility, diatoms, bulk biogeochemical properties (TOC, C/N, d13Corg), and lipid biomarkers (n-alkanes; C16 -C31) reveal changes in clastic sedimentation and the relative input of terrestrial- and aquatic-derived organic matter. Hydrogen isotope values (dD) of mid- (n-C25) and long-chain (n-C29, n-C31) n-alkanes allow reconstruction of dD of precipitation and summertime evaporation of lake water. Following a period of early lake ontogeny and landscape stabilization after deglaciation from 8.4-7.0 ka, the mid-Holocene, 8.4-4.1 ka, is characterized by greater evaporative enrichment of the lake water as indicated by dD records. After 4.1 ka, there is a decrease in evaporative enrichment of the lake water. There is also an abrupt transition to more variable sedimentation marked by sharp increases in magnetic susceptibility, C/N, d13Corg, and the concentration of long-chain n-alkanes, showing periodic delivery of terrestrial organic matter and clastic sediment to the lake. Higher insolation during the mid-Holocene resulted in a warmer and drier climate with longer ice-free periods in the summer and enhanced evaporation of lake water. The reduction in insolation and colder temperatures during the late Holocene caused a reduction in evaporation of lake water over the last 4.1 ka and was accompanied by periodic increases in surface runoff, which correspond with intervals of cold Greenland Ice Sheet surface temperatures. STUDY NOTES: Biogeochemical data from a 1.6-m sediment core from Flower Valley Lake on Ammassalik Island spanning the last 8.8 ka. Data include Magnetic susceptibility, bulk biogeochemical properties (TOC, C/N, d13Corg), lipid biomarkers (n-alkanes; C16 -C31), hydrogen isotope values (dD) of mid- (n-C25) and long-chain (n-C29, n-C31) n-alkanes. NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Balascio, N.L. Investigator : D'Andrea, W.J. Investigator : Bradley, R.S. Investigator : Perren, B. 2013-05-24 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/14513 https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/greenland/flower-valley2013ms.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/greenland/flower-valley2013cn.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/greenland/flower-valley2013alkanes.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/greenland/flower-valley2013ms.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/greenland/flower-valley2013cn.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/greenland/flower-valley2013alkanes.txt English https://www.ncdc.noaa.gov/paleo/study/14513 https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/greenland/flower-valley2013ms.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/greenland/flower-valley2013cn.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/greenland/flower-valley2013alkanes.txt Balascio, N.L., W.J. D'Andrea, R.S. Bradley, and B.B. Perren2013Biogeochemical evidence for hydrologic changes during the Holocene in a lake sediment record from southeast GreenlandThe Holocene231428-143910.1177/0959683613493938 START YEAR: 8771 cal yr BP * END YEAR: -60 cal yr BP -37.6935 65.6107 -37.6935 65.6107