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Rain and ice flagging of Envisat altimeter and MWR data

Rain and ice flagging of Envisat altimeter and MWR data
Rain and ice flagging of Envisat altimeter and MWR data
Altimetry range, wave height, and wind speed measurements are often corrupted by two effects over the ocean: rain and sea-ice. Radiometer measurements, which provide the altimetric wet troposphere correction, are similarly corrupted by the presence of rain or sea-ice in the instrument's footprint. To avoid contamination of sea surface height measurements, it is imperative that data influenced by either of these effects be edited out. The waveform “peakiness” parameter, available on the GDR data sets is effective at identifying sea-ice returns when stringent thresholds are applied. The mean relationship between backscatter (sigma0) at the two altimeter frequencies allows one to flag data impacted by both rain and sea-ice. We present here a new method for flagging rain or sea-ice contaminated data, based on two-dimensional histograms of sigma0.
altimeter, RA-2, Envisat, dual-frequency, rain, ice, land, S-band anomalies
Session 2D5, Abs. No. 205
European Space Agency
Lillibridge, J.
3f3c0a5f-ab74-4d66-8ed2-c72f7a8ad810
Scharroo, R.
aa733522-f4d8-43f6-bece-d385c5d80656
Quartly, G.
3d1e4e87-f001-4d18-b95f-9bca4db6ff9d
Lillibridge, J.
3f3c0a5f-ab74-4d66-8ed2-c72f7a8ad810
Scharroo, R.
aa733522-f4d8-43f6-bece-d385c5d80656
Quartly, G.
3d1e4e87-f001-4d18-b95f-9bca4db6ff9d

Lillibridge, J., Scharroo, R. and Quartly, G. (2004) Rain and ice flagging of Envisat altimeter and MWR data. In 2004 Envisat and ERS Symposium, Salzburg, Austria, 6-10 September 2004: programme and abstract book. European Space Agency. Session 2D5, Abs. No. 205 .

Record type: Conference or Workshop Item (Paper)

Abstract

Altimetry range, wave height, and wind speed measurements are often corrupted by two effects over the ocean: rain and sea-ice. Radiometer measurements, which provide the altimetric wet troposphere correction, are similarly corrupted by the presence of rain or sea-ice in the instrument's footprint. To avoid contamination of sea surface height measurements, it is imperative that data influenced by either of these effects be edited out. The waveform “peakiness” parameter, available on the GDR data sets is effective at identifying sea-ice returns when stringent thresholds are applied. The mean relationship between backscatter (sigma0) at the two altimeter frequencies allows one to flag data impacted by both rain and sea-ice. We present here a new method for flagging rain or sea-ice contaminated data, based on two-dimensional histograms of sigma0.

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More information

Published date: 2004
Venue - Dates: Envisat and ERS Symposium, Salzburg, Austria, 2004-09-06 - 2004-09-10
Keywords: altimeter, RA-2, Envisat, dual-frequency, rain, ice, land, S-band anomalies

Identifiers

Local EPrints ID: 17318
URI: http://eprints.soton.ac.uk/id/eprint/17318
PURE UUID: a5d7fb37-1c57-4905-a5e3-96daa0160172

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Date deposited: 16 Sep 2005
Last modified: 15 Mar 2024 05:58

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Contributors

Author: J. Lillibridge
Author: R. Scharroo
Author: G. Quartly

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