Ocean doppler anomaly and ocean surface current from Sentinel 1 tops mode

Type Proceedings paper
Date 2016
Language English
Author(s) Johnsen Harald1, Nilsen Vegard1, Engen Geir1, Mouche Alexis2, Collard Fabrice3
Affiliation(s) 1 : Northern Research Institute, Box 6434, N-9294 Tromsoe, Norway
2 : Laboratoire d'Ocanographie Spatiale - Ifremer, 29280 Plouzane, France
3 : OceanDataLab, 29280 Locmaria Plouzane, France
Meeting Geoscience and Remote Sensing Symposium (IGARSS), 2016 IEEE International. 10-15 July 2016
Source Geoscience and Remote Sensing Symposium (IGARSS), 2016 IEEE International. 10-15 July 2016.pp. 3993 - 3996
Keyword(s) Doppler effect, Sea surface, Sea measurements, Ocean temperature, Surface treatment, Antennas
Abstract Processing and analysis of Doppler information from Sentinel 1A Interferometric Wide (IW) and Extra Wide (EW) modes are performed for assessing the capabilities of mapping ocean surface current field. Data from Agulhas (South-Africa) and Norwegian Coast are used in combination with numerical models, higher-order satellite products, and Lagrangian drifters. Results show strong Doppler signal and dynamics from coastal areas caused by a mixture of surface current and wind/wave induced drifts at a spatial resolution of around 2 km2 in IW mode and 4km2 in EW mode. Doppler values of up to 70 Hz are observed, corresponding to a surface drift velocity of 3.5 m/s. The Sentinel 1 retrieved surface current component is in reasonable agreement with the circulation models and drifter measurements. Surface current values up to 1.5 m/s are observed in the central Agulhas current, with a standard deviation of around 0.39 m/s with respect to Lagrangian drifters.
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Johnsen Harald, Nilsen Vegard, Engen Geir, Mouche Alexis, Collard Fabrice (2016). Ocean doppler anomaly and ocean surface current from Sentinel 1 tops mode. Geoscience and Remote Sensing Symposium (IGARSS), 2016 IEEE International. 10-15 July 2016.pp. 3993 - 3996. https://archimer.ifremer.fr/doc/00356/46713/