Generation and Validation of two Day Composite Wind Fields from Oceansat-2 Scatterometer

Autor: Tata V. S. Udaya Bhaskar, Chiranjivi Jayaram, Saurabh Bansal, Debadatta Swain, K Krishna Mohan
Rok vydání: 2016
Předmět:
Zdroj: Journal of the Indian Society of Remote Sensing. 45:113-122
ISSN: 0974-3006
0255-660X
DOI: 10.1007/s12524-016-0566-5
Popis: The Oceansat-2 scatterometer (OSCAT) of the Indian Space Research Organization (ISRO), provides surface wind speed and direction with a spatial resolution of 50 km × 50 km. With a revisit time of 2 days it had provided ocean surface wind vectors over the global oceans. In the present work, an attempt has been made to generate two day composite of OSCAT wind vectors using Data-Interpolating Variational Analysis (DIVA) and compare them with daily composite winds to check how better is the two day composites in comparison to daily composites. The daily and two days composite wind vectors of zonal (U) and meridional (V) components have been validated with wind measurements from in situ buoys and Advanced Scatterometer (ASCAT) for the year 2012 over the tropical Indian Ocean region. The statistical comparison with the in situ measurements and ASCAT has shown that the two-day OSCAT wind composites are slightly better than the daily composite winds. The improvement in the statistics can be attributed to the use of ascending and descending passes pertaining to two days which results in fewer gaps between passes, thereby reducing the interpolation errors.
Databáze: OpenAIRE
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