Exploring the potential of Sentinel-3 delay Doppler altimetry for enhanced detection of coastal currents along the Northwest Atlantic shelf

Feng, Hui; Egido, Alejandro; Vandemark, Doug; Wilkin, John

doi:10.1016/j.asr.2022.09.011

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Exploring the potential of Sentinel-3 delay Doppler altimetry for enhanced detection of coastal currents along the Northwest Atlantic shelf

2023
By Feng, Hui ; Egido, Alejandro ; Vandemark, Doug ; ...
Source: Advances in Space Research, 71(1), 997-1016

[PDF-1.24 MB]

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Journal Title:

Advances in Space Research
Personal Author:

Feng, Hui ; Egido, Alejandro ; Vandemark, Doug ; Wilkin, John

Feng, Hui ; Egido, Alejandro ; Vandemark, Doug ; Wilkin, John Less -
NOAA Program & Office:

NOS (National Ocean Service) ; NESDIS (National Environmental Satellite, Data, and Information Service)

NOS (National Ocean Service) ; NESDIS (National Environmental Satellite, Data, and Information Service) Less -
Description:

In this study, we evaluate Sentinel-3A satellite synthetic aperture radar (SAR) altimeter observations along the Northwest Atlantic coast, spanning the Nova Scotian Shelf, Gulf of Maine, and Mid-Atlantic Bight. Comparisons are made of altimeter sea surface height (SSH) measurements from three different altimeter data processing approaches: fully-focused synthetic aperture radar (FFSAR), un-focused SAR (UFSAR), and conventional low-resolution mode (LRM). Results show that fully-focused SAR data always outperform LRM data and are comparable or slightly better than the nominal un-focused SAR product. SSH measurement noise in both SAR-mode datasets is significantly reduced compared to LRM. FFSAR SSH 20-Hz noise levels, derived from 80-Hz FFSAR data, are lower than 20-Hz UFSAR SSH with 25% noise reduction offshore of 5 km, and 55–70% within 5 km of the coast. The offshore noise improvement is most likely due to the higher native along-track data posting rate (80 Hz for FFSAR, and 20 Hz for UFSAR), while the large coastal improvement indicates an apparent FFSAR data processing advantage approaching the coastlines. FFSAR-derived geostrophic ocean current estimates exhibit the lowest bias and noise when compared to in situ buoy-measured currents. Assessment at short spatial scales of 5–20 km reveals that Sentinel-3A SAR data provide sharper and more realistic measurement of small-scale sea surface slopes associated with expected nearshore coastal currents and small-scale gyre features that are much less well resolved in conventional altimetric LRM data.
Keywords:

[+]

Aerospace Engineering Astronomy And Astrophysics Atmospheric Science General Earth And Planetary Sciences Geophysics Space And Planetary Science
Source:

Advances in Space Research, 71(1), 997-1016
DOI:

https://doi.org/10.1016/j.asr.2022.09.011
ISSN:

0273-1177
Format:

PDF
Publisher:

Elsevier BV
Document Type:

Journal Article
Funding:

Grant no. NA16NOS0120020 ; Grant no. NA19NES4320002

Grant no. NA16NOS0120020 ; Grant no. NA19NES4320002 Less -
Rights Information:

Accepted Manuscript
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Submitted
Main Document Checksum:

[+]

urn:sha256:36b5a7c60e48ac1014eab249f43024518022065c03d927d4c64148af8ed4e7e9
Download URL:

https://repository.library.noaa.gov/view/noaa/55845/noaa_55845_DS1.pdf
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Exploring the potential of Sentinel-3 delay Doppler altimetry for enhanced detection of coastal currents along the Northwest Atlantic shelf

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