Changes in the North Pacific wave climate since the mid-1990s
Changes in the North Pacific wave climate since the mid-1990s
复制标题
20世纪90年代中期以来北太平洋波浪气候的变化
DOI：
10.1002/2014gl061590
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发表时间：
2014
影响因子：
5.2
通讯作者：
Wataru Sasaki
中科院分区：
文献类型：
--
作者：
村山武彦;土志田匡啓;Takehiko Murayama;Wataru Sasaki
自20世纪90年代中期以来，海浪再分析和现场波浪观测显示，波高有明显的下降趋势，在北太平洋中纬度地区每十年超过-0.1米。热带太平洋的波浪周期也呈下降趋势，在此期间每十年超过-0.4秒。太平洋波浪气候的这些变化可归因于热带太平洋最近加强的信风和拉尼娜现象。中纬度北太平洋有效波高的下降趋势是由于太平洋-北美遥相关的负相位的加强。波浪模式的数值试验还表明，赤道东太平洋波浪周期的下降趋势不仅是由于信风加强引起的风浪增加，而且也是由于中纬度北太平洋的涌浪传播减弱所致。
Since the mid‐1990s, ocean wave reanalysis and in situ wave observations have revealed marked downward trends in wave height, exceeding −0.1 m per decade in the midlatitude North Pacific. The wave period in the tropical Pacific is also on a downward trend, exceeding −0.4 s per decade during this period. These changes in wave climate in the Pacific are attributable to recently strengthened trade winds and La Niña‐like conditions in the tropical Pacific. The downward trend in significant wave height in the midlatitude North Pacific is due to strengthening of the negative phase of the Pacific‐North American teleconnection. Numerical experimentations with a wave model also showed that the downward trend in the wave period in the eastern equatorial Pacific was induced not only by increased wind waves due to strengthened trade winds but also by weakened propagating swells from the midlatitude North Pacific.