近45年北印度洋海表风、浪特征研究

Wave analysis of the North Indian Ocean from 1957 to 2002

基于第三代海浪数值模式（WAVEWAZTCH-III），以ERA．40海表风场为驱动场，得到北印度洋1957年9月-2002年8月的海浪场，并分析其特征。研究发现，北印度洋1958～2001年年平均海表风速和有效波高均呈缓慢递增趋势；北印度洋的海表风速、有效波高存在2．36～5．2a左右的共同周期及26a的长周期震荡；北印度洋海域年平均海表风速、有效波高的突变形势与冬季相似，突变期在20世纪80年代初。本研究可以为在北印度洋这一重要战略通道上作业的船只提供重要参考。

Characteristics of waves from Sep. 1957 to Aug. 2002 in the North Indian had been analyzed, on the basis of WAVEWATCH -III drived with ERA- 40 sea-surface wind field. The North Indian monsoon was affected mainly by winter and summer. Wave-heights in summer were obviously higher than those in other seasons. Year-averages of surface winds or wave-heights were slowly increasing in the North Indian, 1958N2001. The cycles of 2.36-5.2 years of sea-surface winds and wave-heights were the same, and so were the cycles of longer than 26 years. In the North Indian, saltation with year-average of surface winds and wave-heights were similar to winter in the early 1980s.