Selective Response of the South China Sea Circulation to Summer Monsoon
Selective Response of the South China Sea Circulation to Summer Monsoon
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DOI：
10.1175/jpo-d-16-0288.1
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发表时间：
2017-06
影响因子：
3.5
通讯作者：
Haiyuan Yang;Lixin Wu;Shantong Sun;Zhaohui Chen
中科院分区：
文献类型：
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作者：
Haiyuan Yang;Lixin Wu;Shantong Sun;Zhaohui Chen
摘要利用实测资料和1.5层简化重力模式研究了南海环流对夏季风季节内变化的响应。南海夏季风季节内变化的特征是中海盆风急流强度的演变，其典型振幅为6 m s−1，功率谱在10 - 60天之间有几个峰值。然而，这项研究发现，在南海海面高度（SSH）的季节内变化呈现出显着的变化，越南东南部的振幅为6厘米，周期只有40和60天之间。这暗示了海洋响应风强迫的频率选择性。数值试验表明，南海环流的内在变化解释了这一现象。基于Rossby盆地模式理论，这是由长，向西传播的Rossby波和短，向东传播的Rossby波之间的相互作用解释。
AbstractThe response of the South China Sea (SCS) circulation to intraseasonal variability of the summer monsoon is studied with both observations and a 1.5-layer reduced-gravity model. Intraseasonal variability of the SCS summer monsoon is characterized by evolution of the wind jet intensity in the midbasin with typical amplitude of 6 m s−1 and several peaks on its power spectrum between 10 and 60 days. However, this study finds that intraseasonal variability of the sea surface height (SSH) in the SCS presents significant variability to the southeast of Vietnam with amplitude of 6 cm and a period only between 40 and 60 days. This implicates the frequency selectivity of oceanic response to wind forcing. Numerical experiments suggest that the intrinsic variability of the SCS circulation accounts for this phenomenon. Based on the Rossby basin mode theory, this is explained by the interaction between the long, westward-propagating Rossby waves and the short, eastward-propagating Rossby waves.