Active-passive synergy for interpreting ocean L-band emissivity: Results from the CAROLS airborne campaigns
Active-passive synergy for interpreting ocean L-band emissivity: Results from the CAROLS airborne campaigns
The impact of the ocean surface roughness on the ocean L-band emissivity is investigated using simultaneous airborne measurements from an L-band radiometer (CAROLS) and from a C-band scatterometer (STORM) acquired in the Gulf of Biscay (off-the French Atlantic coasts) in November 2010. Two synergetic approaches are used to investigate the impact of surface roughness on the L-band brightness temperature (Tb). First, wind derived from the scatterometer measurements is used to analyze the roughness contribution to Tb as a function of wind and compare it with the one simulated by SMOS and Aquarius roughness models. Then residuals from this mean relationship are analyzed in terms of mean square slope derived from the STORM instrument. We show improvement of new radiometric roughness models derived from SMOS and Aquarius satellite measurements in comparison with prelaunch models. Influence of wind azimuth on Tb could not be evidenced from our data set. However, we point out the importance of taking into account large roughness scales (>20 cm) in addition to small roughness scale (5 cm) rapidly affected by wind to interpret radiometric measurements far from nadir. This was made possible thanks to simultaneous estimates of large and small roughness scales using STORM at small (7–16°) and large (30°) incidence angles.
L-band microwave radiometry, C-band scatterometry, sea surface roughness, mean square slope (mss), sea surface salinity (SSS), wind speed
4940-4957
Martin, A.C.H.
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Boutin, J.
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Hauser, D.
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Dinnat, E.P.
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August 2014
Martin, A.C.H.
e47e1b62-a223-4474-9490-c2c3895291ec
Boutin, J.
1d2ca4a2-1915-436d-aa2f-3a076e30eed3
Hauser, D.
c2129b46-1662-469a-93f9-f8c46b1e11af
Dinnat, E.P.
16aa05c2-ba14-4f3f-ac0c-ad66d5f5c7fb
Martin, A.C.H., Boutin, J., Hauser, D. and Dinnat, E.P.
(2014)
Active-passive synergy for interpreting ocean L-band emissivity: Results from the CAROLS airborne campaigns.
Journal of Geophysical Research: Oceans, 119 (8), .
(doi:10.1002/2014JC009890).
Abstract
The impact of the ocean surface roughness on the ocean L-band emissivity is investigated using simultaneous airborne measurements from an L-band radiometer (CAROLS) and from a C-band scatterometer (STORM) acquired in the Gulf of Biscay (off-the French Atlantic coasts) in November 2010. Two synergetic approaches are used to investigate the impact of surface roughness on the L-band brightness temperature (Tb). First, wind derived from the scatterometer measurements is used to analyze the roughness contribution to Tb as a function of wind and compare it with the one simulated by SMOS and Aquarius roughness models. Then residuals from this mean relationship are analyzed in terms of mean square slope derived from the STORM instrument. We show improvement of new radiometric roughness models derived from SMOS and Aquarius satellite measurements in comparison with prelaunch models. Influence of wind azimuth on Tb could not be evidenced from our data set. However, we point out the importance of taking into account large roughness scales (>20 cm) in addition to small roughness scale (5 cm) rapidly affected by wind to interpret radiometric measurements far from nadir. This was made possible thanks to simultaneous estimates of large and small roughness scales using STORM at small (7–16°) and large (30°) incidence angles.
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Accepted/In Press date: August 2014
Published date: August 2014
Keywords:
L-band microwave radiometry, C-band scatterometry, sea surface roughness, mean square slope (mss), sea surface salinity (SSS), wind speed
Organisations:
Marine Physics and Ocean Climate
Identifiers
Local EPrints ID: 367985
URI: http://eprints.soton.ac.uk/id/eprint/367985
ISSN: 2169-9275
PURE UUID: cf7a3798-00ef-4ec6-a693-a6094470284b
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Date deposited: 12 Aug 2014 12:27
Last modified: 14 Mar 2024 17:39
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Contributors
Author:
A.C.H. Martin
Author:
J. Boutin
Author:
D. Hauser
Author:
E.P. Dinnat
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