气候变化领域集成服务门户(CCPortal): Melt in Antarctica derived from Soil Moisture and Ocean Salinity (SMOS) observations at L band

CCPortal

DOI	10.5194/tc-14-539-2020
	Melt in Antarctica derived from Soil Moisture and Ocean Salinity (SMOS) observations at L band
	Leduc-Leballeur M.; Picard G.; MacElloni G.; Mialon A.; Kerr Y.H.
发表日期	2020
ISSN	19940416
起始页码	539
结束页码	548
卷号	14 期号:2
英文摘要	Melt occurrence in Antarctica is derived from L-band observations from the Soil Moisture and Ocean Salinity (SMOS) satellite between the austral summer 2010-2011 and 2017-2018. The detection algorithm is adapted from a threshold method previously developed for 19 GHz passive microwave measurements from the special sensor microwave imager (SSM/I) and special sensor microwave imager sounder (SSMIS). The comparison of daily melt occurrence retrieved from 1.4 and 19 GHz observations shows an overall close agreement, but a lag of few days is usually observed by SMOS at the beginning of the melt season. To understand the difference, a theoretical analysis is performed using a microwave emission radiative transfer model. It shows that the sensitivity of 1.4 GHz signal to liquid water is significantly weaker than at 19 GHz if the water is only present in the uppermost tens of centimetres of the snowpack. Conversely, 1.4 GHz measurements are sensitive to water when spread over at least 1 m and when present in depths up to hundreds of metres. This is explained by the large penetration depth in dry snow and by the long wavelength (21 cm). We conclude that SMOS and higher-frequency radiometers provide interesting complementary information on melt occurrence and on the location of the water in the snowpack. © 2020 Author(s).
英文关键词	algorithm; instrumentation; observational method; radiative transfer; satellite sensor; SMOS; spatiotemporal analysis; Antarctica
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/202136
作者单位	Institute of Applied Physics "nello Carrara", National Research Council, Sesto Fiorentino, 50019, Italy; UGA, CNRS, Institut des Géosciences de l'Environnement (IGE), UMR 5001, Grenoble, 38041, France; CESBIO, CNES-CNRS-IRD-UPS, University of Toulouse, Toulouse Cedex 09, 31401, France
推荐引用方式 GB/T 7714	Leduc-Leballeur M.,Picard G.,MacElloni G.,et al. Melt in Antarctica derived from Soil Moisture and Ocean Salinity (SMOS) observations at L band[J],2020,14(2).
APA	Leduc-Leballeur M.,Picard G.,MacElloni G.,Mialon A.,&Kerr Y.H..(2020).Melt in Antarctica derived from Soil Moisture and Ocean Salinity (SMOS) observations at L band.Cryosphere,14(2).
MLA	Leduc-Leballeur M.,et al."Melt in Antarctica derived from Soil Moisture and Ocean Salinity (SMOS) observations at L band".Cryosphere 14.2(2020).