| ZHU Geli,LIN Wantao,ZHAO Sen,CAO Yanhua. 2015. Spatial and temporal variation characteristics of ocean waves in the South China Sea during the boreal winter. Acta Oceanologica Sinica, 34(1):23－28 |
| Spatial and temporal variation characteristics of ocean waves in the South China Sea during the boreal winter |
| 南海冬季海浪的时空变率特征 |
| Received:April 09, 2014 Revised:July 04, 2014 |
| DOI：10.1007/s13131-015-0592-0 |
| Key words:ocean waves interannual variability South China Sea ENSO PdO |
| 中文关键词: 海浪 年际变率 南海 ENSO PdO |
| 基金项目:The National Basic Research Program (973 Program) of China under contract No. 2011CB403501. |
| Author Name | Affiliation | E-mail | | ZHU Geli | State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid dynamics, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China
Department of Mathematics and Physics, North China Electric Power University, Beijing 102206, China | juliekxkl@126.com | | LIN Wantao | State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid dynamics, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China | | | ZHAO Sen | State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid dynamics, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China
University of Chinese Academy of Sciences, Beijing 100049, China | | | CAO Yanhua | Department of Mathematics and Physics, North China Electric Power University, Beijing 102206, China | |
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| Abstract: |
| The spatial and temporal variation characteristics of the waves in the South China Sea (SCS) in the boreal winter during the period of 1979/1980-2011/2012 have been investigated based on the European Centre for Medium-range Weather Forecasts interim (ERA-Interim) reanalysis dataset. The results show that the leading mode of significant wave height anomalies (SWHA) in the SCS exhibits significant interannual variation and a decadal shift around the mid-1990s, and features a basin-wide pattern in the entire SCS with a center located in the west of the Luzon Strait. The decadal change from a weak regime to a strong regime is mainly associated with the enhancement of winter monsoon modulated by the Pacific decadal oscillation (PdO). The interannual variation of the SWHA has a significant negative correlation with the El Niño Southern Oscillation (ENSO) in the same season and the preceding autumn. For a better understanding of the physical mechanism between the SCS ocean waves and ENSO, further investigation is made by analyzing atmospheric circulation. The impact of the ENSO on the SWHA over the SCS is bridged by the East Asian winter monsoon and Pacific-East Asian teleconnection in the lower troposphere. during the El Niño (La Niña), the anomalous Philippine Sea anticyclone (cyclone) dominates over the Western North Pacific, helps to weaken (enhance) East Asian winter monsoon and then emerges the negative (positive) SWHA in the SCS. |
| 中文摘要: |
| 本文利用欧洲中尺度天气预报中心提供的高分辨率再分析数据集ERA-Interim 资料, 分析了1979/80-2011/12 冬季南海海浪的时空变率特征. 结果表明: 南海冬季有效波高的主导模态存在显著的年代际和年际变化特征(上世纪90 年代中期), 空间模态呈海盆一致模, 异常中心位于吕宋海峡西侧. 在年代际尺度上, 有效波高从负位相转变为正位相主要受太平洋十年涛动(PdO)对东亚冬季风的调制作用影响;年代际尺度上, 波高变率与前秋和同期的 ENSO有很显著的负相关. 为了更好地探究南海海浪与ENSO 的物理机制, 我们进一步对环流场做了相应分析, 证明了 ENSO 通过南海冬季风和对流层底层的太平洋-东亚遥相关影响南海海浪. 在 El Niño(La Niña)年, 西太平洋被菲律宾海的异常反气旋(气旋)覆盖, 削弱(增强)了东亚冬季风从而导致南海海浪异常偏低(偏高). |
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