Analysis of Global Ocean Sea Surface Wind Speed Over Recent 44 Years
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Abstract:
Based on the ERA 40 sea surface 10 m wind field data of the European Centre for Medium Range Weather Forecasts (ECMWF), the change trends of the global sea surface wind speed from 1958 to 2001 are analyzed, mainly including the overall change trend, seasonal differences, regional differences, and change cycles. The result indicates: (1) Global sea surface wind speed increased significantly and linearly with a rate of 00067 m〖DK〗·s-1〖DK〗·a-1 year by year during the recent 44 years; the change of global sea surface wind speed is relatively gentle in the period of 1958 to 1975 and relatively sharp in the period of 1975 to 1983 The peak and valley of the annual mean global sea surface wind speed appeared in 1999 and 1975, respectively. (2) The change trends of global sea surface wind speed showed significant regional differences. The areas with an obvious increasing trend are mainly distributed in the Antarctic region, tropical Atlantic and North Pacific westerly zone waters, low latitudes in the Indian Ocean, and the regions near 60°S in the Southern Hemisphere, especially with the strongest increasing trend in the Southern Hemisphere high latitude waters; significantly decreasing areas are mainly distributed in the regions near the equatorial Middle East Pacific, Juan Fernandez Islands, the south westerly zone in the central Atlantic Ocean, as well as some sporadic waters. (3) The change trends of global sea surface wind speed showed significant seasonal differences with a significant linear increasing trend for all months. The sharpest increasing trend is in December (00103 m〖DK〗·s-1〖DK〗·a-1), and the gentlest increasing trend is in July (approximately 00033 m〖DK〗·s-1〖DK〗·a-1). (4) There is obvious periodic change in Global ocean sea surface wind speed with the periods being 22 to 43 years, as well as 65 years.
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Supported by:Beijing E-Tiller Technology Development Co., Ltd.
Supported by:Beijing E-Tiller Technology Development Co., Ltd.