Northeast Greenland Ice Stream (NEGIS) 2012 Ice Core Chemistry and Density Vallelonga, P. Vallelonga, P. earth science/paleoclimate/ice cores (ice age,null,null,year Common Era,null,ice cores,null,null,N,null) earth science/paleoclimate/ice cores (sodium,bulk ice,null,nanogram per gram,null,ice cores,null,null,N,null) earth science/paleoclimate/ice cores (layer thickness,bulk ice,null,meter,null,ice cores,null,null,N,annual layer thickness) earth science/paleoclimate/ice cores (ice age,null,null,calendar year before present,null,ice cores,null,null,N,null) earth science/paleoclimate/ice cores (ammonium,bulk ice,null,nanogram per gram,null,ice cores,null,null,N,null) earth science/paleoclimate/ice cores (accumulation rate,bulk ice,null,meter per year,null,ice cores,null,null,N,meters of ice equivalent per year) earth science/paleoclimate/ice cores (deuterium excess,bulk ice,null,per mil SMOW,null,ice cores,null,null,N,null) earth science/paleoclimate/ice cores (electrical conductivity,bulk ice,null,microsiemens per centimeter,null,ice cores,null,null,N,Electrolytic meltwater conductivity) earth science/paleoclimate/ice cores (density,bulk ice,null,gram per cubic centimeter,null,ice cores,null,null,N,null) earth science/paleoclimate/ice cores (depth,null,null,meter,null,ice cores,null,null,N,null) earth science/paleoclimate/ice cores (delta 18O,bulk ice,null,per mil SMOW,null,ice cores,null,null,N,null) earth science/paleoclimate/ice cores (dust,bulk ice,null,count per milliliter,null,ice cores,null,null,N,null) earth science/paleoclimate/ice core earth science/paleoclimate/ice core earth science/paleoclimate/ice core (Northeast Greenland Ice Stream (NEGIS)>LATITUDE 75.623>LONGITUDE -35.96) The Northeast Greenland Ice Stream (NEGIS) is the sole interior Greenlandic ice stream. Fast flow initiates near the summit dome, and the ice stream terminates approximately 1000 km downstream in three large outlet glaciers that calve into the Greenland Sea. To better understand this important system, in the summer of 2012 we drilled a 67 m firn core and conducted ground-based radio-echo sounding (RES) and active-source seismic surveys at a site approximately 150 km downstream from the onset of streaming flow (NEGIS firn core, 75 37.61'N, 35 56.49'W). The site is representative of the upper part of the ice stream, while also being in a crevasse-free area for safe surface operations. Annual cycles were observed for insoluble dust, sodium and ammonium concentrations and for electrolytic conductivity, allowing a seasonally resolved chronology covering the past 400 yr. Annual layer thicknesses averaged 0.11 m ice equivalent (i.e.) for the period 1607-2011, although accumulation varied between 0.08 and 0.14 m i.e., likely due to flow-related changes in surface topography. Tracing of RES layers from the NGRIP (North Greenland Ice Core Project) ice core site shows that the ice at NEGIS preserves a climatic record of at least the past 51 kyr. We demonstrate that deep ice core drilling in this location can provide a reliable Holocene and late-glacial climate record, as well as helping to constrain the past dynamics and ice-lithosphere interactions of the Greenland Ice Sheet. STUDY NOTES: CFA chemistry, density, accumulation, and annual layer thickness data produced from NEGIS 2012 ice core NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Vallelonga, P. 2016-08-11 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/20427 https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/greenland/negis2012age.txt https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/greenland/negis2012chem.txt https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/greenland/negis2012dens.txt https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/greenland/negis2012age.txt https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/greenland/negis2012chem.txt https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/greenland/negis2012dens.txt English https://www.ncdc.noaa.gov/paleo/study/20427 https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/greenland/negis2012age.txt https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/greenland/negis2012chem.txt https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/greenland/negis2012dens.txt P. Vallelonga, K. Christianson, R.B. Alley, S. Anandakrishnan, J.E.M. Christian, D. Dahl-Jensen, V. Gkinis, C. Holme, R.W. Jacobel, N.B. Karlsson, B.A. Keisling, S. Kipfstuhl, H.A. Kjær, M.E.L. Kristensen, A. Muto, L.E. Peters, T. Popp, K.L. Riverman, A.M. Svensson, C. Tibuleac, B.M. Vinther, Y. Weng, and M. Winstrup2014Initial results from geophysical surveys and shallow coring of the Northeast Greenland Ice Stream (NEGIS)The Cryosphere841275-128710.5194/tc-8-1275-2014http://www.the-cryosphere.net/8/1275/2014/ START YEAR: 343 cal yr BP * END YEAR: -62 cal yr BP -35.96 75.623 -35.96 75.623