气候变化领域集成服务门户(CCPortal): Assessment of satellite altimetry SWH measurements by in situ observations within 25 km from the coast

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DOI	10.1007/s10236-024-01597-9
	Assessment of satellite altimetry SWH measurements by in situ observations within 25 km from the coast
	Bue, Isabel; Lemos, Gil; Semedo, Alvaro; Catalao, Joao
发表日期	2024
ISSN	1616-7341
EISSN	1616-7228
起始页码	74
结束页码	3
卷号	74 期号:3
英文摘要	Satellite radar altimeters (SA) have been providing ocean wind and wave measurements for over 35 years. These data have been used for modelling data assimilation, improving wind and wave climatology, and determining long-term trends of the oceanic wave parameters. Fixed observational sites (in situ locations), such as buoys, have provided reliable wave observations since the early 1970s. However, their positioning is inhomogeneous, mainly in the Northern Hemisphere, and only provides point measurements. SA significant wave height (SWH) measurements have been proven as accurate as in situ observations, particularly in the open ocean. Progress in coastal altimetry sensors, upgraded data corrections, and new extraction algorithms have recently improved the quality of SA measurements closer to the coast. This study evaluates the performance of 12 SA missions from 1985 to 2020, particularly in nearshore areas. The SA SWH along-track measurements are compared with observations from 402 in situ locations, distributed worldwide within 25 km of the coastline. Results indicate a slight overestimation from the 12 SA missions, mainly for lower sea states (under 2 m high) and closer to the coast (0 to 10 km). The Sentinel-3 mission showed the highest percentages of valid measurements near the coast and presented 72.66% of collocated in situ data. This SA mission has shown the best overall performance closer to the coast, with biases, correlation coefficient, and root-mean-squared error of 0.23 m, 0.85 m, and 0.50 m, respectively. SA undersampling in coastal areas is present and can lead to underestimation during extreme wave events. The cross-validation of the wave data in two regional analyses conducted during periods of severe wave conditions is evaluated for the new altimeters' generation.
英文关键词	Satellite altimetry; Coastal monitoring; Significant wave height; In situ observations
语种	英语
WOS研究方向	Oceanography
WOS类目	Oceanography
WOS记录号	WOS:001143990700001
来源期刊	OCEAN DYNAMICS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/303030
作者单位	Universidade de Lisboa; IHE Delft Institute for Water Education
推荐引用方式 GB/T 7714	Bue, Isabel,Lemos, Gil,Semedo, Alvaro,et al. Assessment of satellite altimetry SWH measurements by in situ observations within 25 km from the coast[J],2024,74(3).
APA	Bue, Isabel,Lemos, Gil,Semedo, Alvaro,&Catalao, Joao.(2024).Assessment of satellite altimetry SWH measurements by in situ observations within 25 km from the coast.OCEAN DYNAMICS,74(3).
MLA	Bue, Isabel,et al."Assessment of satellite altimetry SWH measurements by in situ observations within 25 km from the coast".OCEAN DYNAMICS 74.3(2024).