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ISSN 2070-7401 (Print), ISSN 2411-0280 (Online)
Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa
CURRENT PROBLEMS IN REMOTE SENSING OF THE EARTH FROM SPACE

  

Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2016, Vol. 13, No. 6, pp. 63-74

On reconstruction of turbulent momentum flux in the atmospheric boundary layer under strong wind and hurricane conditions from measurements of sea surface microwave backscatter cross section on orthogonal polarization

Yu.I. Troitskaya 1 , V.I. Abramov 2, 1 , A.V. Ermoshkin 1 , E.M. Zuikova 1 , V.I. Kazakov 1 , D.A. Sergeev 1, 3 , A.A. Kandaurov 1, 3 , O.S. Ermakova 1, 3 
1 Institute of Applied Physics RAS, Nizhny Novgorod, Russia
2 Radiophysical Research Institute, Nizhni Novgorod, Russia
3 N.I. Lobachevsky State University of Nizhni Novgorod, Nizhni Novgorod, Russia
Accepted: 03.11.2016
DOI: 10.21046/2070-7401-2016-13-6-63-74
On the basis of laboratory experiments on simultaneous measurements of normalized X-band radar cross-section (NRCS) of water surface for co-polarized and de-polarized radar return and parameters of the turbulent boundary air layer for storm and hurricane conditions, and a comparison with the available in-situ measurements, we propose a geophysical model function (GMF) linking NRCS for X and C-band de-polarized radar return with the wind friction velocity which is one of the most important characteristics governing many geophysical processes (ocean circulation, storm surge, wave generation, mixing of the upper ocean layer, etc.). Traditional GMFs representing NRCS dependencies on wind speed on orthogonal polarization at standard meteorological height of 10 m are retrieved based on NRSC logarithmic dependency on wind friction velocity on orthogonal polarization. A comparison with in-situ measurement data shows that the proposed X-band GMF is similar to the empirical GMF for C-band. Based on this result, a GMF linking NRCS for the de-polarized radar return in the C-band and the wind friction velocity is suggested. The proposed GMF is applicable for remote retrieval of wind speed for storm and hurricane conditions.
Keywords: radar scattering on sea surface, co-polarized and de-polarized radar return, storm, hurricane, microwave remote sensing, polarization, boundary layers of atmosphere and ocean, wind speed, Reynolds stress
Full text

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