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Sensors 2008, 8(6), 3633-3642; doi:10.3390/s8063633

Article

Free and Forced Rossby Waves in the Western South China Sea Inferred from Jason-1 Satellite Altimetry Data

Xiangyu Wu, Qiang Xie, Zhigang He and Dongxiao Wang*

Key Laboratory of Tropical Marine Environmental Dynamics, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou, P.R. China

* Author to whom correspondence should be addressed.

Received: 24 January 2008; in revised form: 23 May 2008 / Accepted: 23 May 2008 / Published: 1 June 2008

(This article belongs to the Special Issue Ocean Remote Sensing)

Download PDF Full-Text [115 KB, uploaded 16 September 2008 11:02 CEST]

Abstract: Data from a subsurface mooring deployed in the western South China Sea shows clear intra-seasonal oscillations (ISO) at the period of 40~70 days. Analysis of remotelysensed sea surface height (SSH) anomalies in the same area indicates that these ISO signals propagate both eastward and westward. Time-longitude diagrams of ISO signals in SSH anomalies and wind-stress curl indicate that the eastward propagating SSH anomalies is forced by wind-stress curl. This is also confirmed by lag correlation between SSH anomalies and the wind-stress-curl index (wind stress curl averaged over 109.5ºE -115ºE and 12ºN -13.5ºN). Lag correlation of SSH anomaly suggests that the westward propagating signals are free Rossby waves.

Keywords: intra-seasonal signal; South China Sea; Rossby wave; sea surface height

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