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

机译:根据Jason-1卫星测高仪数据推论的南海西部的自由强迫罗斯比波

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摘要

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 remotely-sensed 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 109.5°E -115°E and 12°N -13.5°N). Lag correlation of SSH anomaly suggests that the westward propagating signals are free Rossby waves.
机译:来自南中国海西部的地下系泊设备的数据显示,在40到70天的时间内存在明显的季节内振荡(ISO)。对同一地区的遥感海面高度(SSH)异常进行分析表明,这些ISO信号向东和向西传播。 SSH异常和风应力卷曲中ISO信号的时间经度图表明,向东传播的SSH异常是由风应力卷曲推动的。 SSH异常与风应力-卷曲指数之间的滞后关系也证实了这一点(风应力卷曲在109.5°E -115°E和12°N -13.5°N范围内平均)。 SSH异常的滞后相关性表明,向西传播的信号是自由的Rossby波。

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