An assessment of CYGNSS ocean wind speed products

Hammond, Matthew ORCID: https://orcid.org/0000-0002-8918-2351; Foti, Giuseppe ORCID: https://orcid.org/0000-0002-1507-2133; Gommenginger, Christine ORCID: https://orcid.org/0000-0002-6941-1671; Srokosz, Meric ORCID: https://orcid.org/0000-0002-7347-7411; Floury, Nicolas. 2021 An assessment of CYGNSS ocean wind speed products. In: EGU General Assembly 2021, Online, 19-30 April 2021.

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Abstract/Summary

Global Navigation Satellite System-Reflectometry (GNSS-R) is an innovative and rapidly developing approach to Earth Observation that makes use of signals of opportunity from Global Navigation Satellite Systems, which have been reflected off the Earth’s surface. CYGNSS is a constellation of 8 satellites launched in 2016 which use GNSS-R technology for the remote sensing of ocean wind speed. The ESA ECOLOGY project aims to evaluate CYGNSS data which has recently undergone a series of improvements in the calibration approach. Using CYGNSS collections above the ocean surface, an assessment of Level-1 calibration is presented, alongside a performance evaluation of Level-2 wind speed products. L1 data collected by the individual satellites are shown to be generally well inter-calibrated and remarkably stable over time, a significant improvement over previous versions. However, some geographical biases are found, which appear to be linked to a number of factors including the transmitter-receiver pair considered, viewing geometry, and surface elevation. These findings provide a basis for further improvement of CYGNSS products and have wider applicability to improving calibration of GNSS-R sensors for remote sensing of the Earth.

Item Type:	Publication - Conference Item (Paper)
Digital Object Identifier (DOI):	10.5194/egusphere-egu21-3717
Date made live:	19 May 2021 13:14 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/530349

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