气候变化领域集成服务门户(CCPortal): Nadir altimetry Vis-à-Vis swath altimetry: A study in the context of SWOT mission for the Bay of Bengal

CCPortal

DOI	10.1016/j.rse.2020.112120
	Nadir altimetry Vis-à-Vis swath altimetry: A study in the context of SWOT mission for the Bay of Bengal
	Chaudhary A.; Agarwal N.; Sharma R.; Ojha S.P.; Kumar R.
发表日期	2021
ISSN	00344257
卷号	252
英文摘要	Conventional nadir looking altimeters make along track measurements on a line and mapped sea level anomaly (SLA) information is obtained using a combination of several such altimeters (Jason, SARAL, Cryosat etc.). Mapping techniques, in general, introduce a lot of uncertainties in sea level representation and sub-mesoscale variability. Surface Water and Ocean Topography (SWOT) mission, based on radar interferometry, will measure SLA along wide swath thus providing detailed ocean information. This study aims to evaluate the advantages of SWOT measurements over nadir looking altimeters by making use of SWOT-simulator tool in the Bay of Bengal (BoB) region. Although, BoB is a small basin but interestingly it is full of mesoscale and sub-mesoscale features. The study performs several sensitivity experiments to allow a comparison of gridded SLA product from SWOT with the product from a constellation of nadir altimeters. Space-time scales for mapping the SLA from SWOT were obtained by performing a series of sensitivity experiments involving different spatial resolutions and temporal sampling. Sensitivity to different type of errors on the quality of mapped SLA fields from nadir-altimeters and SWOT is also carried out. In case of SWOT, mapped SLA fields generated using correlated noise were better as compared to the maps that were generated by making an assumption that the noise is uncorrelated. It is found that gridded SLA from SWOT have less error in the eddy dominant (high variability) regions as compared to the mapped SLA field from nadir altimeters, which perform better in the regions of low SLA variability. Apart from this, the position and strength of mesoscale eddies is well resolved by SWOT-mapped SLA fields as compared to nadir-altimeter mapped fields. © 2020 Elsevier Inc.
语种	英语
scopus关键词	Mapping; Meteorological instruments; Surface waters; Topography; Mapping techniques; Mesoscale features; Mesoscale variability; Radar interferometry; Sea level anomaly; Spatial resolution; Temporal sampling; Track measurement; Sea level
来源期刊	Remote Sensing of Environment
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/179088
作者单位	Earth, Ocean, Atmosphere, Planetary Sciences and Applications Area, Space Applications Centre, ISRO, Ahmedabad, 380015, India
推荐引用方式 GB/T 7714	Chaudhary A.,Agarwal N.,Sharma R.,et al. Nadir altimetry Vis-à-Vis swath altimetry: A study in the context of SWOT mission for the Bay of Bengal[J],2021,252.
APA	Chaudhary A.,Agarwal N.,Sharma R.,Ojha S.P.,&Kumar R..(2021).Nadir altimetry Vis-à-Vis swath altimetry: A study in the context of SWOT mission for the Bay of Bengal.Remote Sensing of Environment,252.
MLA	Chaudhary A.,et al."Nadir altimetry Vis-à-Vis swath altimetry: A study in the context of SWOT mission for the Bay of Bengal".Remote Sensing of Environment 252(2021).