气候变化领域集成服务门户(CCPortal): On Removal of Sea State Contribution to Sentinel-1 Doppler Shift for Retrieving Reliable Ocean Surface Current

CCPortal

DOI	10.1029/2020JC016288
	On Removal of Sea State Contribution to Sentinel-1 Doppler Shift for Retrieving Reliable Ocean Surface Current
	Moiseev A.; Johnsen H.; Johannessen J.A.; Collard F.; Guitton G.
发表日期	2020
ISSN	21699275
卷号	125 期号:9
英文摘要	The Doppler frequency shift acquired by Synthetic Aperture Radar (SAR) contains information about ocean surface motion induced by waves and the underlying ocean currents in the radar range direction. An accurate estimate of the wave-induced contribution is therefore required to derive a reliable estimation of the ocean surface current. In this study, we developed an empirical model for estimating the wave-induced Doppler shift based on Sentinel-1B Wave Mode (WV) Level 2 Ocean products acquired from December 2017 to January 2018 collocated with wind field from ECMWF and wavefield from WAVEWATCH III. We found that the relationship between the wind field at 10 m height and the Doppler shift from Sentinel-1 is in agreement with previous findings based on ASAR observations. Retraining of the conventional CDOP model for the Sentinel-1 observations (CDOP-S) yields distinct improvements. We speculate that the improvement is due to different sensor properties and hence biases in the data. Moreover, combing wave and wind information into the model yield considerable improvements especially for the Southern Ocean and the North Pacific. Given accurate wave bias correction, the ocean surface radial velocity maps based on 2 months of Sentinel-1 acquisitions agree with ocean surface current climatology derived from multiyear drifter observations. This suggests that Sentinel-1 Doppler shift observations can be used to study ocean surface currents with 20 km spatial resolutions at a monthly time scale. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	Doppler shift; neural networks; ocean surface currents; sea state; Sentinel-1
语种	英语
来源期刊	Journal of Geophysical Research: Oceans
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/186668
作者单位	Nansen Environmental and Remote Sensing Center, Bergen, Norway; NORCE Norwegian Research Center AS, Tromsø, Norway; Geophysical Institute, University of Bergen, Bergen, Norway; OceanDataLab, Locmaria Plouzane, France
推荐引用方式 GB/T 7714	Moiseev A.,Johnsen H.,Johannessen J.A.,et al. On Removal of Sea State Contribution to Sentinel-1 Doppler Shift for Retrieving Reliable Ocean Surface Current[J],2020,125(9).
APA	Moiseev A.,Johnsen H.,Johannessen J.A.,Collard F.,&Guitton G..(2020).On Removal of Sea State Contribution to Sentinel-1 Doppler Shift for Retrieving Reliable Ocean Surface Current.Journal of Geophysical Research: Oceans,125(9).
MLA	Moiseev A.,et al."On Removal of Sea State Contribution to Sentinel-1 Doppler Shift for Retrieving Reliable Ocean Surface Current".Journal of Geophysical Research: Oceans 125.9(2020).