The relationship between significant wave height and Indian Ocean Dipole in the equatorial North Indian Ocean
The relationship between significant wave height and Indian Ocean Dipole in the equatorial North Indian Ocean
复制标题
赤道北印度洋有效波高与印度洋偶极子的关系
DOI：
10.1007/s10236-018-1154-8
复制
发表时间：
2018-06-01
期刊：
影响因子：
2.3
通讯作者：
Yao, Jinglong
中科院分区：
文献类型：
--
作者：
Fu, Chen;Wang, Dongxiao;Yao, Jinglong
根据再分析资料，我们发现印度洋偶极子（IOD）在赤道北方印度洋（NIO）波动气候的变率中起着重要的作用。在赤道NIO，特别是在斯里兰卡东南部的沃茨，显着波高（SWH），表现出强烈的年际变化。SWH异常的沃茨东南斯里兰卡相关以及偶极模式指数（）在夏季和秋季。正IOD事件期间，斯里兰卡东南海域出现SWH负异常，并随IOD类型的不同而变化。在IOD为正的长时间（非季节性）IOD期间，SWH异常在秋季（夏季）最强，而在IOD为正的正常IOD期间，SWH异常在夏季和秋季都很弱。正IOD事件期间，斯里兰卡东南海区的强东风异常减弱了原有的赤道西风应力，导致风浪减弱。正IOD事件期间较长的波浪周期进一步证实了较少的风浪。负IOD事件期间的SWH异常模式与正IOD事件期间的SWH异常模式几乎相反。
Based on reanalysis data, we find that the Indian Ocean Dipole (IOD) plays an important role in the variability of wave climate in the equatorial Northern Indian Ocean (NIO). Significant wave height (SWH) in the equatorial NIO, especially over the waters southeast to Sri Lanka, exhibits strong interannual variations. SWH anomalies in the waters southeast to Sri Lanka correlate well with dipole mode index (DMI) during both summer and autumn. Negative SWH anomalies occur over the oceanic area southeast to Sri Lanka during positive IOD events and vary with different types of IOD. During positive prolonged (unseasonable) IOD, the SWH anomalies are the strongest in autumn (summer); while during positive normal IOD, the SWH anomalies are weak in both summer and autumn. Strong easterly wind anomalies over the southeast oceanic area of Sri Lanka during positive IOD events weaken the original equatorial westerly wind stress, which leads to the decrease in wind-sea waves. The longer wave period during positive IOD events further confirms less wind-sea waves. The SWH anomaly pattern during negative IOD events is nearly opposite to that during positive IOD events.