气候变化领域集成服务门户(CCPortal): Initial results from geophysical surveys and shallow coring of the Northeast Greenland Ice Stream (NEGIS)

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DOI	10.5194/tc-8-1275-2014
	Initial results from geophysical surveys and shallow coring of the Northeast Greenland Ice Stream (NEGIS)
	Vallelonga P.; Christianson K.; Alley R.B.; Anandakrishnan S.; Christian J.E.M.; Dahl-Jensen D.; Gkinis V.; Holme C.; Jacobel R.W.; Karlsson N.B.; Keisling B.A.; Kipfstuhl S.; Kjær H.A.; Kristensen M.E.L.; Muto A.; Peters L.E.; Popp T.; Riverman K.L.; Svensson A.M.; Tibuleac C.; Vinther B.M.; Weng Y.; Winstrup M.
发表日期	2014
ISSN	19940416
卷号	8 期号:4
英文摘要	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. © Author(s) 2014. CC Attribution 3.0 License.
语种	英语
来源期刊	Cryosphere
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/120085
作者单位	Centre for Ice and Climate, Niels Bohr Institute, University of Copenhagen, Juliane Maries vej 30, Copenhagen 2100, Denmark; Courant Institute of Mathematical Science, New York University, 251 Mercer St, New York, NY 10012, United States; Physics Department, St Olaf College, 1520 St Olaf Ave, Northfield, MN 55057, United States; Department of Geosciences, Earth and Environmental Systems Institute, Pennsylvania State University, University Park, PA 16802-6813, United States; Department of Geosciences, University of Massachusetts Amherst, 611 North Pleasant St., Amherst, MA 01003-9297, United States; Alfred Wegener Institute, Am Handelshafen 12, 27570 Bremerhaven, Germany
推荐引用方式 GB/T 7714	Vallelonga P.,Christianson K.,Alley R.B.,et al. Initial results from geophysical surveys and shallow coring of the Northeast Greenland Ice Stream (NEGIS)[J],2014,8(4).
APA	Vallelonga P..,Christianson K..,Alley R.B..,Anandakrishnan S..,Christian J.E.M..,...&Winstrup M..(2014).Initial results from geophysical surveys and shallow coring of the Northeast Greenland Ice Stream (NEGIS).Cryosphere,8(4).
MLA	Vallelonga P.,et al."Initial results from geophysical surveys and shallow coring of the Northeast Greenland Ice Stream (NEGIS)".Cryosphere 8.4(2014).