noaa-icecore-20427 Northeast Greenland Ice Stream (NEGIS) 2012 Ice Core Chemistry and Density Vallelonga, P. Northeast Greenland Ice Stream (NEGIS) 2012 Ice Core Chemistry and Density 2016-08-11 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/20427 Investigator P. Vallelonga 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 physical properties earth science paleoclimate ice core age control earth science paleoclimate ice core chemistry geoscientificInformation 343 cal yr BP -62 cal yr BP Complete 75.623 75.623 -35.96 -35.96 2702 2702 Continent North America Greenland Northeast Greenland Ice Stream (NEGIS)>LATITUDE 75.623>LONGITUDE -35.96 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 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. Winstrup 2014 The Cryosphere 8 4 1275-1287 10.5194/tc-8-1275-2014 http://www.the-cryosphere.net/8/1275/2014/

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

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/greenland/negis2012age.txt Data File; NEGIS 2012 Ice Core Age Model GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/greenland/negis2012chem.txt Data File; NEGIS 2012 Ice Core Chemistry and Isotope Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/greenland/negis2012dens.txt Data File; NEGIS 2012 Ice Core Density, Accumulation, and Layer Thickness Data USA/NOAA DIF Version 9.8.4 2018-12-11 2018-12-11