气候变化领域集成服务门户(CCPortal): Benefits of assimilating thin sea ice thickness from SMOS into the TOPAZ system

CCPortal

DOI	10.5194/tc-10-2745-2016
	Benefits of assimilating thin sea ice thickness from SMOS into the TOPAZ system
	Xie J.; Counillon F.; Bertino L.; Tian-Kunze X.; Kaleschke L.
发表日期	2016
ISSN	19940416
卷号	10 期号:6
英文摘要	An observation product for thin sea ice thickness (SMOS-Ice) is derived from the brightness temperature data of the European Space Agency's (ESA) Soil Moisture and Ocean Salinity (SMOS) mission. This product is available in near-real time, at daily frequency, during the cold season. In this study, we investigate the benefit of assimilating SMOS-Ice into the TOPAZ coupled ocean and sea ice forecasting system, which is the Arctic component of the Copernicus marine environment monitoring services. The TOPAZ system assimilates sea surface temperature (SST), altimetry data, temperature and salinity profiles, ice concentration, and ice drift with the ensemble Kalman filter (EnKF). The conditions for assimilation of sea ice thickness thinner than 0.4 m are favorable, as observations are reliable below this threshold and their probability distribution is comparable to that of the model. Two parallel Observing System Experiments (OSE) have been performed in March and November 2014, in which the thicknesses from SMOS-Ice (thinner than 0.4 m) are assimilated in addition to the standard observational data sets. It is found that the root mean square difference (RMSD) of thin sea ice thickness is reduced by 11 % in March and 22 % in November compared to the daily thin ice thicknesses of SMOS-Ice, which suggests that SMOS-Ice has a larger impact during the beginning of the cold season. Validation against independent observations of ice thickness from buoys and ice draft from moorings indicates that there are no degradations in the pack ice but there are some improvements near the ice edge close to where the SMOS-Ice has been assimilated. Assimilation of SMOS-Ice yields a slight improvement for ice concentration and degrades neither SST nor sea level anomaly. Analysis of the degrees of freedom for signal (DFS) indicates that the SMOS-Ice has a comparatively small impact but it has a significant contribution in constraining the system (> 20 % of the impact of all ice and ocean observations) near the ice edge. The areas of largest impact are the Kara Sea, Canadian Archipelago, Baffin Bay, Beaufort Sea and Greenland Sea. This study suggests that the SMOS-Ice is a good complementary data set that can be safely included in the TOPAZ system. © Author(s) 2016.
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/119546
作者单位	Nansen Environmental and Remote Sensing Center, Bergen, Norway; Institute of Oceanography, University of Hamburg, Hamburg, Germany
推荐引用方式 GB/T 7714	Xie J.,Counillon F.,Bertino L.,et al. Benefits of assimilating thin sea ice thickness from SMOS into the TOPAZ system[J],2016,10(6).
APA	Xie J.,Counillon F.,Bertino L.,Tian-Kunze X.,&Kaleschke L..(2016).Benefits of assimilating thin sea ice thickness from SMOS into the TOPAZ system.Cryosphere,10(6).
MLA	Xie J.,et al."Benefits of assimilating thin sea ice thickness from SMOS into the TOPAZ system".Cryosphere 10.6(2016).