气候变化领域集成服务门户(CCPortal): Evaluation of long-term Northern Hemisphere snow water equivalent products

CCPortal

DOI	10.5194/tc-14-1579-2020
	Evaluation of long-term Northern Hemisphere snow water equivalent products
	Mortimer C.; Mudryk L.; Derksen C.; Luojus K.; Brown R.; Kelly R.; Tedesco M.
发表日期	2020
ISSN	19940416
起始页码	1579
结束页码	1594
卷号	14 期号:5
英文摘要	Nine gridded Northern Hemisphere snow water equivalent (SWE) products were evaluated as part of the European Space Agency (ESA) Satellite Snow Product Intercomparison and Evaluation Exercise (SnowPEx). Three categories of datasets were assessed: (1) those utilizing some form of reanalysis (the NASA Global Land Data Assimilation System version 2 - GLDAS-2; the European Centre for Medium-Range Weather Forecasts (ECMWF) interim land surface reanalysis - ERA-Interim/Land and ERA5; the NASA Modern-Era Retrospective Analysis for Research and Applications version 1 (MERRA) and version 2 (MERRA-2); the Crocus snow model driven by ERA-Interim meteorology - Crocus); (2) passive microwave remote sensing combined with daily surface snow depth observations (ESA GlobSnow v2.0); and (3) stand-alone passive microwave retrievals (NASA AMSR-E SWE versions 1.0 and 2.0) which do not utilize surface snow observations. Evaluation included validation against independent snow course measurements from Russia, Finland, and Canada and product intercomparison through the calculation of spatial and temporal correlations in SWE anomalies. The stand-alone passive microwave SWE products (AMSR-E v1.0 and v2.0 SWE) exhibit low spatial and temporal correlations to other products and RMSE nearly double the best performing product. Constraining passive microwave retrievals with surface observations (GlobSnow) provides performance comparable to the reanalysis-based products; RMSE over Finland and Russia for all but the AMSR-E products is ĝˆ1/450 mm or less, with the exception of ERA-Interim/Land over Russia. Using a seven-dataset ensemble that excluded the stand-alone passive microwave products reduced the RMSE by 10 mm (20 %) and increased the correlation from 0.67 to 0.78 compared to any individual product. The overall performance of the best multiproduct combinations is still at the margins of acceptable uncertainty for scientific and operational requirements; only through combined and integrated improvements in remote sensing, modeling, and observations will real progress in SWE product development be achieved. © 2020 Copernicus GmbH. All rights reserved.
英文关键词	data assimilation; data set; Northern Hemisphere; operations technology; remote sensing; satellite altimetry; snow water equivalent; weather forecasting; Crocus
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/202161
作者单位	Climate Research Division, Environment and Climate Change Canada, Toronto, Canada; Finnish Meteorological Institute, Helsinki, Finland; Department of Geography and Environmental Management, University of Waterloo, Waterloo, Canada; Lamont Doherty Earth Observatory, Columbia University, Palisades, NY, United States; NASA Goddard Institute for Space Studies, New York, United States
推荐引用方式 GB/T 7714	Mortimer C.,Mudryk L.,Derksen C.,et al. Evaluation of long-term Northern Hemisphere snow water equivalent products[J],2020,14(5).
APA	Mortimer C..,Mudryk L..,Derksen C..,Luojus K..,Brown R..,...&Tedesco M..(2020).Evaluation of long-term Northern Hemisphere snow water equivalent products.Cryosphere,14(5).
MLA	Mortimer C.,et al."Evaluation of long-term Northern Hemisphere snow water equivalent products".Cryosphere 14.5(2020).