Ensuring that the Sentinel-3A altimeter provides climate-quality data
Sentinel-3A, launched in February 2016, is part of ESA's long-term commitment to climate monitoring from space. Its suite of instruments for measuring surface topography includes a Microwave Radiometer (MWR) and SRAL, the first delay-Doppler instrument to provide global coverage. SRAL promises...
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ftucl:oai:eprints.ucl.ac.uk.OAI2:10045020 2023-12-24T10:24:47+01:00 Ensuring that the Sentinel-3A altimeter provides climate-quality data Quartly, GD Nencioli, F Labroue, S Femenias, P Scharroo, R Abdalla, S Bonnefond, P Cancet, M Frery, M-L Raynal, M Baker, S Muir, A Brockley, D Shepherd, A Garcia, P Roca, M Calmant, S Cretaux, J-F Bostater, CR Mertikas, SP Neyt, X Babichenko, S 2017-01-01 text https://discovery.ucl.ac.uk/id/eprint/10045020/1/104220R.pdf https://discovery.ucl.ac.uk/id/eprint/10045020/ eng eng SPIE Conference on Remote Sensing of the Ocean, Sea Ice, Coastal Waters, and Large Water Regions https://discovery.ucl.ac.uk/id/eprint/10045020/1/104220R.pdf https://discovery.ucl.ac.uk/id/eprint/10045020/ open In: Bostater, CR and Mertikas, SP and Neyt, X and Babichenko, S, (eds.) Proceedings of the conference on Remote Sensing of the Ocean, Sea Ice, Coastal Waters, and Large Water Regions 2017. (pp. 104220R1-104220R16). SPIE: Warsaw, Poland. (2017) Remote Sensing Optics climate monitoring Sentinel altimeter calibration/validation sea surface height cryosphere inland waters sea level ocean dynamics CALIBRATION Proceedings paper 2017 ftucl 2023-11-27T13:07:35Z Sentinel-3A, launched in February 2016, is part of ESA's long-term commitment to climate monitoring from space. Its suite of instruments for measuring surface topography includes a Microwave Radiometer (MWR) and SRAL, the first delay-Doppler instrument to provide global coverage. SRAL promises fine spatial resolution and reduced noise levels that should together lead to improved performance over all Earth surfaces. The Sentinel-3 Mission Performance Centre (S3MPC) has been developing the methodology to evaluate the accuracy of retrievals, monitor any changes and develop solutions to known problems. The S3MPC monitors internal temperatures, path delays and the shape of the generated pulses to assess the instruments health. The MWR records over known reference surfaces are compared with those from other spaceborne instruments. Over the ocean the SRAL's return pulses are analysed to give range to the sea surface, wave height and signal strength (which can be interpreted as wind speed). The metocean data are regularly contrasted with records from in situ measurements and the output from meteorological models, which rapidly highlights the effects of any changes in processing. Range information is used to give surface elevation, which is assessed in three ways. First, flights over a dedicated radar transponder provide an estimate of path delay to within ~10 mm (r.m.s.). Second, measurements are compared to GPS-levelled surfaces near Corsica and over Lake Issyk-kul. Third, there are consistency checks between ascending and descending passes and with other missions. Further waveform analysis techniques are being developed to improve the retrieval of information over sea-ice, land-ice and inland waters. Report Sea ice University College London: UCL Discovery The Sentinel ENVELOPE(73.317,73.317,-52.983,-52.983) |
institution |
Open Polar |
collection |
University College London: UCL Discovery |
op_collection_id |
ftucl |
language |
English |
topic |
Remote Sensing Optics climate monitoring Sentinel altimeter calibration/validation sea surface height cryosphere inland waters sea level ocean dynamics CALIBRATION |
spellingShingle |
Remote Sensing Optics climate monitoring Sentinel altimeter calibration/validation sea surface height cryosphere inland waters sea level ocean dynamics CALIBRATION Quartly, GD Nencioli, F Labroue, S Femenias, P Scharroo, R Abdalla, S Bonnefond, P Cancet, M Frery, M-L Raynal, M Baker, S Muir, A Brockley, D Shepherd, A Garcia, P Roca, M Calmant, S Cretaux, J-F Ensuring that the Sentinel-3A altimeter provides climate-quality data |
topic_facet |
Remote Sensing Optics climate monitoring Sentinel altimeter calibration/validation sea surface height cryosphere inland waters sea level ocean dynamics CALIBRATION |
description |
Sentinel-3A, launched in February 2016, is part of ESA's long-term commitment to climate monitoring from space. Its suite of instruments for measuring surface topography includes a Microwave Radiometer (MWR) and SRAL, the first delay-Doppler instrument to provide global coverage. SRAL promises fine spatial resolution and reduced noise levels that should together lead to improved performance over all Earth surfaces. The Sentinel-3 Mission Performance Centre (S3MPC) has been developing the methodology to evaluate the accuracy of retrievals, monitor any changes and develop solutions to known problems. The S3MPC monitors internal temperatures, path delays and the shape of the generated pulses to assess the instruments health. The MWR records over known reference surfaces are compared with those from other spaceborne instruments. Over the ocean the SRAL's return pulses are analysed to give range to the sea surface, wave height and signal strength (which can be interpreted as wind speed). The metocean data are regularly contrasted with records from in situ measurements and the output from meteorological models, which rapidly highlights the effects of any changes in processing. Range information is used to give surface elevation, which is assessed in three ways. First, flights over a dedicated radar transponder provide an estimate of path delay to within ~10 mm (r.m.s.). Second, measurements are compared to GPS-levelled surfaces near Corsica and over Lake Issyk-kul. Third, there are consistency checks between ascending and descending passes and with other missions. Further waveform analysis techniques are being developed to improve the retrieval of information over sea-ice, land-ice and inland waters. |
author2 |
Bostater, CR Mertikas, SP Neyt, X Babichenko, S |
format |
Report |
author |
Quartly, GD Nencioli, F Labroue, S Femenias, P Scharroo, R Abdalla, S Bonnefond, P Cancet, M Frery, M-L Raynal, M Baker, S Muir, A Brockley, D Shepherd, A Garcia, P Roca, M Calmant, S Cretaux, J-F |
author_facet |
Quartly, GD Nencioli, F Labroue, S Femenias, P Scharroo, R Abdalla, S Bonnefond, P Cancet, M Frery, M-L Raynal, M Baker, S Muir, A Brockley, D Shepherd, A Garcia, P Roca, M Calmant, S Cretaux, J-F |
author_sort |
Quartly, GD |
title |
Ensuring that the Sentinel-3A altimeter provides climate-quality data |
title_short |
Ensuring that the Sentinel-3A altimeter provides climate-quality data |
title_full |
Ensuring that the Sentinel-3A altimeter provides climate-quality data |
title_fullStr |
Ensuring that the Sentinel-3A altimeter provides climate-quality data |
title_full_unstemmed |
Ensuring that the Sentinel-3A altimeter provides climate-quality data |
title_sort |
ensuring that the sentinel-3a altimeter provides climate-quality data |
publisher |
SPIE |
publishDate |
2017 |
url |
https://discovery.ucl.ac.uk/id/eprint/10045020/1/104220R.pdf https://discovery.ucl.ac.uk/id/eprint/10045020/ |
long_lat |
ENVELOPE(73.317,73.317,-52.983,-52.983) |
geographic |
The Sentinel |
geographic_facet |
The Sentinel |
genre |
Sea ice |
genre_facet |
Sea ice |
op_source |
In: Bostater, CR and Mertikas, SP and Neyt, X and Babichenko, S, (eds.) Proceedings of the conference on Remote Sensing of the Ocean, Sea Ice, Coastal Waters, and Large Water Regions 2017. (pp. 104220R1-104220R16). SPIE: Warsaw, Poland. (2017) |
op_relation |
https://discovery.ucl.ac.uk/id/eprint/10045020/1/104220R.pdf https://discovery.ucl.ac.uk/id/eprint/10045020/ |
op_rights |
open |
_version_ |
1786199909414731776 |