气候变化领域集成服务门户(CCPortal): Marked decrease in the near-surface snow density retrieved by AMSR-E satellite at Dome C, Antarctica, between 2002 and 2011

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DOI	10.5194/tc-13-1215-2019
	Marked decrease in the near-surface snow density retrieved by AMSR-E satellite at Dome C, Antarctica, between 2002 and 2011
	Champollion N.; Picard G.; Arnaud L.; Lefebvre E.; MacElloni G.; Rémy F.; Fily M.
发表日期	2019
ISSN	19940416
EISSN	13
起始页码	1215
结束页码	1232
卷号	13 期号:4
英文摘要	Surface snow density is an important variable for the surface mass balance and energy budget. It evolves according to meteorological conditions, in particular, snowfall, wind, and temperature, but the physical processes governing atmospheric influence on snow are not fully understood. A reason is that no systematic observation is available on a continental scale. Here, we use the passive microwave observations from AMSR-E satellite to retrieve the surface snow density at Dome C on the East Antarctic Plateau. The retrieval method is based on the difference of surface reflections between horizontally and vertically polarized brightness temperatures at 37GHz, highlighted by the computation of the polarization ratio, which is related to surface snow density. The relationship has been obtained with a microwave emission radiative transfer model (DMRT-ML). The retrieved density, approximately representative of the topmost 3cm of the snowpack, compares well with in situ measurements. The difference between mean in situ measurements and mean retrieved density is 26.2kgm-3, which is within typical in situ measurement uncertainties. We apply the retrieval method to derive the time series over the period 2002-2011. The results show a marked and persistent pluri-annual decrease of about 10kgm3yr1, in addition to atmosphere-related seasonal, weekly, and daily density variations. This trend is confirmed by independent active microwave observations from the ENVISAT and QuikSCAT satellites, though the link to the density is more difficult to establish. However, no related pluri-annual change in meteorological conditions has been found to explain such a trend in snow density. Further work will concern the extension of the method to the continental scale. © 2019 Author(s).
学科领域	AMSR-E; brightness temperature; climate conditions; energy budget; glacier mass balance; in situ measurement; polarization; QuikSCAT; radiative transfer; satellite altimetry; snow; uncertainty analysis; Antarctica; Dome Concordia; East Antarctica
语种	英语
scopus关键词	AMSR-E; brightness temperature; climate conditions; energy budget; glacier mass balance; in situ measurement; polarization; QuikSCAT; radiative transfer; satellite altimetry; snow; uncertainty analysis; Antarctica; Dome Concordia; East Antarctica
来源期刊	The Cryosphere
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/118895
作者单位	Institut des Géosciences de l'Environnement (UMR 5001), CNRS/UGA/Grenoble-INP/IRD, CS 40700, Grenoble Cedex 9, 38058, France; Institute of Applied Physics, IFAC/CNR, Via Madonna del Piano 10, Fiorentino, 50019, Italy; Laboratoire d'Étude en Géophysique et Océanographie Spatiales (UMR 5566), UPS/CNRS, 18 av. Edouard Belin, Toulouse Cedex 9, 31401, France; Climate Lab, University of Bremen, Celsiusstrasse 2, Bremen, 28359, Germany
推荐引用方式 GB/T 7714	Champollion N.,Picard G.,Arnaud L.,et al. Marked decrease in the near-surface snow density retrieved by AMSR-E satellite at Dome C, Antarctica, between 2002 and 2011[J],2019,13(4).
APA	Champollion N..,Picard G..,Arnaud L..,Lefebvre E..,MacElloni G..,...&Fily M..(2019).Marked decrease in the near-surface snow density retrieved by AMSR-E satellite at Dome C, Antarctica, between 2002 and 2011.The Cryosphere,13(4).
MLA	Champollion N.,et al."Marked decrease in the near-surface snow density retrieved by AMSR-E satellite at Dome C, Antarctica, between 2002 and 2011".The Cryosphere 13.4(2019).