NDLI: Assessing ocean salinity retrieval using WindSAT data over the Amazone river plume and North Brazil Current retroflection

Content Provider	IEEE Xplore Digital Library
Author	Picart, S.S. Reul, N. Guimbard, S. Chapron, B. Vandemark, D.
Copyright Year	2008
Description	Author affiliation: Lab. d'Ocanographie Spatiale, Brest (Picart, S.S.; Reul, N.; Guimbard, S.; Chapron, B.) \|\| NASA Goddard Space Flight Center, Hydrospheric & Biospheric Sci. Lab., Wallops Island, VA (Vandemark, D.)
Abstract	Measurement of ocean surface salinity (SSS) dynamics from space involve precise determination of the dielectric characteristics of seawater through low-noise passive microwave (MW) radiometer measurement of the oceans brightness temperature (TB), optimally performed at a low frequency near 1.4 GHz (L-band). The future SMOS mission is based on such principles and will aim at retrieving SSS with an accuracy of the order of 0.1 psu (practical salinity units). This represents numerous engineering and scientific challenges, in particular because competing terms carried in the ocean TB measurements, foremost being sea surface temperature (SST) and ocean surface roughness, must be accounted for in a new and more robust manner. Prior to launch, we analyze the sensitivity of the future measurements to these factors by looking at somewhat higher frequency C and X-band data (6.8 and 10.7 versus the L-band 1.4 GHz) that are readily available from several recent MW imagers (AMSR-E, TMI, WindSAT). The shift to C and X-bands lowers TB sensitivity to changes in salinity by a large factor of 10-20. To compensate, we performed our study over the Amazon plume region where there are large (100-200 km) and persistent salinity contrasts that exceed the 0.1 psu science salinity requirement by a factor of 10-40 [1]-[2]. This region is of great importance within the salinity mission context due to the large freshwater flux and northward propagating eddies from retroreflection of the North Brazil Current (NBC). The validity of the emissivity/scattering models developed for SMOS at L-band are analyzed at these higher frequencies and our ability to detect these world largest salinity gradients is assessed.
Starting Page	1
Ending Page	5
File Size	909156
Page Count	5
File Format	PDF
ISBN	9781424428151
DOI	10.1109/PASSIVE.2008.4787006
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2008-10-14
Publisher Place	France
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Sea surface Sea measurements Dielectric measurements Information retrieval Rivers Frequency measurement Ocean salinity Ocean temperature L-band Microwave measurements
Content Type	Text
Resource Type	Article

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

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