Quartly, GD;
Nencioli, F;
Labroue, S;
Femenias, P;
Scharroo, R;
Abdalla, S;
Bonnefond, P;
... Cretaux, J-F; + view all
(2017)
Ensuring that the Sentinel-3A altimeter provides climate-quality data.
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.
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Abstract
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.
| Type: | Proceedings paper |
|---|---|
| Title: | Ensuring that the Sentinel-3A altimeter provides climate-quality data |
| Event: | SPIE Remote Sensing |
| Location: | Warsaw, POLAND |
| Dates: | 11 September 2017 - 12 September 2017 |
| ISBN-13: | 978-1-5106-1308-9 |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1117/12.2277593 |
| Publisher version: | http://dx.doi.org/10.1117/12.2277593 |
| Language: | English |
| Additional information: | This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Remote Sensing, Optics, climate monitoring, Sentinel, altimeter, calibration/validation, sea surface height, cryosphere, inland waters, sea level, ocean dynamics, CALIBRATION |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Space and Climate Physics |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10045020 |
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