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Exploitation of the ENVISAT radar altimeter individual echoes and S-band data for ocean, coastal zone, land and ice/sea ice altimetry (RAIES). Task 6: Scientific applications of S-band data

Exploitation of the ENVISAT radar altimeter individual echoes and S-band data for ocean, coastal zone, land and ice/sea ice altimetry (RAIES). Task 6: Scientific applications of S-band data
Exploitation of the ENVISAT radar altimeter individual echoes and S-band data for ocean, coastal zone, land and ice/sea ice altimetry (RAIES). Task 6: Scientific applications of S-band data
This report presents the results of Task 6 of the study led by the Southampton Oceanography Centre under ESRIN Contract No.17900/03/I-LG in response to AO/1-4539/03/I-LG on the Exploitation of the ENVISAT Radar Altimeter Individual Echoes and S Band Data for Ocean, Coastal Zone, Land and Ice/Sea-Ice Altimetry (RAIES). This report first reviews the findings relating to scientific applications of RA2 S-band data for the ocean and the coastal zone, including improved rain, wind and wave products. Using a combination of numerical waveform simulations and comparisons with ERS2 and buoy data, the added value provided by S-band measurements to estimate range, wave height and backscatter was examined. S-band measurements over the ocean and in the coastal zone appear much noisier than Ku-band and ERS measurements when validated against SWH buoy data. However, S-band ?0 values are found to be less affected by rain than Ku-band ?0. Ionospheric corrections based on RA-2 dualfrequency data show good agreement with those obtained from the JPL Global Ionospheric Maps (GIM). Global analyses show that S-band anomalies occur globally, with slight preference over Indonesia and descent over South America, plus poles. No periodicity is evident, indicating a likely instrumental origin. A new approach to estimating sea state bias at S-band using theoretical and empirical formulations is proposed.

The second part of the report presents the scientific applications with S-band data over land and ice/sea ice surfaces. Overall, the use of S-band for land/ice surfaces sounds promising. Extremely good echo retrieval is achieved at S-band over land surfaces, attributed to the width of the S band range window. Over sea ice, intriguing variations in the complex echo shapes are seen between Ku and S-band. Unexpected temporal variations are observed in many categories of waveform shape at S-band, which are not mirrored at Ku-band. This strongly indicates that the information content at S band differs significantly from that at Ku band over land as well as ice surfaces. This makes S-band data a valuable addition for non-ocean studies, and fully justifies the need to include S-band in the analysis of RA-2 waveforms.
ENVISAT RA2, altimetry, S-band, rain, SSB, ionospheric correction, wind and waves, land, ice/sea ice, EAPRS expert system
Southampton Oceanography Centre
Challenor, P.G.
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Gommenginger, C.P.
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Quartly, G.D.
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Gomez-Enri, J.
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Srokosz, M.A.
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Caltabiano, A.
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Berry, P.A.M.
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Mathers, L.
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Garlick, J.
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Cotton, P.D.
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Carter, D.J.T.
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Challenor, P.G.
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Gommenginger, C.P.
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Quartly, G.D.
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Gomez-Enri, J.
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Srokosz, M.A.
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Caltabiano, A.
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Berry, P.A.M.
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Mathers, L.
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Garlick, J.
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Cotton, P.D.
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Carter, D.J.T.
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Challenor, P.G., Gommenginger, C.P., Quartly, G.D., Gomez-Enri, J., Srokosz, M.A., Caltabiano, A., Berry, P.A.M., Mathers, L., Garlick, J., Cotton, P.D. and Carter, D.J.T. (2004) Exploitation of the ENVISAT radar altimeter individual echoes and S-band data for ocean, coastal zone, land and ice/sea ice altimetry (RAIES). Task 6: Scientific applications of S-band data (Southampton Oceanography Centre Research and Consultancy Report 94) Southampton, UK. Southampton Oceanography Centre 77pp.

Record type: Monograph (Project Report)

Abstract

This report presents the results of Task 6 of the study led by the Southampton Oceanography Centre under ESRIN Contract No.17900/03/I-LG in response to AO/1-4539/03/I-LG on the Exploitation of the ENVISAT Radar Altimeter Individual Echoes and S Band Data for Ocean, Coastal Zone, Land and Ice/Sea-Ice Altimetry (RAIES). This report first reviews the findings relating to scientific applications of RA2 S-band data for the ocean and the coastal zone, including improved rain, wind and wave products. Using a combination of numerical waveform simulations and comparisons with ERS2 and buoy data, the added value provided by S-band measurements to estimate range, wave height and backscatter was examined. S-band measurements over the ocean and in the coastal zone appear much noisier than Ku-band and ERS measurements when validated against SWH buoy data. However, S-band ?0 values are found to be less affected by rain than Ku-band ?0. Ionospheric corrections based on RA-2 dualfrequency data show good agreement with those obtained from the JPL Global Ionospheric Maps (GIM). Global analyses show that S-band anomalies occur globally, with slight preference over Indonesia and descent over South America, plus poles. No periodicity is evident, indicating a likely instrumental origin. A new approach to estimating sea state bias at S-band using theoretical and empirical formulations is proposed.

The second part of the report presents the scientific applications with S-band data over land and ice/sea ice surfaces. Overall, the use of S-band for land/ice surfaces sounds promising. Extremely good echo retrieval is achieved at S-band over land surfaces, attributed to the width of the S band range window. Over sea ice, intriguing variations in the complex echo shapes are seen between Ku and S-band. Unexpected temporal variations are observed in many categories of waveform shape at S-band, which are not mirrored at Ku-band. This strongly indicates that the information content at S band differs significantly from that at Ku band over land as well as ice surfaces. This makes S-band data a valuable addition for non-ocean studies, and fully justifies the need to include S-band in the analysis of RA-2 waveforms.

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Published date: 2004
Additional Information: Deposited at the request of Dr C. Gommenginger
Keywords: ENVISAT RA2, altimetry, S-band, rain, SSB, ionospheric correction, wind and waves, land, ice/sea ice, EAPRS expert system

Identifiers

Local EPrints ID: 44787
URI: https://eprints.soton.ac.uk/id/eprint/44787
PURE UUID: 62f06563-2efb-4966-ad83-363ead098d3b

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Date deposited: 15 Mar 2007
Last modified: 13 Mar 2019 21:06

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Contributors

Author: P.G. Challenor
Author: C.P. Gommenginger
Author: G.D. Quartly
Author: J. Gomez-Enri
Author: M.A. Srokosz
Author: A. Caltabiano
Author: P.A.M. Berry
Author: L. Mathers
Author: J. Garlick
Author: P.D. Cotton
Author: D.J.T. Carter

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