A semiannual Indian Ocean forced Kelvin wave observed in the Indonesian seas in May 1997
A semiannual Indian Ocean forced Kelvin wave observed in the Indonesian seas in May 1997
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DOI：
10.1029/2000jc900065
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发表时间：
2000-07
影响因子：
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通讯作者：
J. Sprintall;A. Gordon;R. Murtugudde;R. Susanto
中科院分区：
文献类型：
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作者：
J. Sprintall;A. Gordon;R. Murtugudde;R. Susanto
最近对印度尼西亚出口通道和内海的观测高度解析了半年一次开尔文波的到达和通过。 1997年5月中旬，南爪哇海流位于爪哇岛南部的一个系泊处，表层和次表层流向东南方向流动，而当地风力强迫则向西北方向流动。随后通过龙目海峡的地转流和来自位于望加锡海峡的两个系泊处观测到的流的向北波动与开尔文波穿过该地区的速度和通道相称。开尔文波是由于半年四月/五月季风过渡期间偏远赤道印度洋的西风强迫造成的。这通过南爪哇海流系泊位置和龙目海峡海平面的简单远程风力分析开尔文波速度模型以及 Murtugudde 等人的数值大气环流模型证实了这一点。 [1998]。在爪哇南部系泊处和望加锡海峡内测得的温暖异常与开尔文波的通过有关。在南爪哇系泊处测得的盐度异常与印度洋来源一致。 1997年5月观测到的开尔文波的经过首次明确表明赤道印度洋远程风力强迫有时可能影响印度尼西亚内海
Recent observations within the Indonesian exit passages and internal seas highly resolve the arrival and passage of a semiannual Kelvin wave. In mid-May 1997, surface and subsurface currents were to the southeast at a mooring located south of Java in the South Java Current, while local wind forcing was northwestward. Subsequent northward fluctuations in the geostrophic current through Lombok Strait and in observed currents from two moorings located in Makassar Strait are commensurate with the speed and passage of a Kelvin wave through the region. The Kelvin wave was due to westerly wind forcing in the remote equatorial Indian Ocean during the semiannual April/May monsoon transition period. This was confirmed through a simple remote wind-forced analytical Kelvin wave model of velocity at the South Java Current mooring location and sea level in Lombok Strait and also in the numerical general circulation model of Murtugudde et al. [1998]. Warm temperature anomalies measured at the south Java mooring and within Makassar Strait are associated with the passage of the Kelvin wave. Salinity anomalies measured at the south Java mooring are consistent with an Indian Ocean source. The observed passage of the Kelvin wave during May 1997 unambiguously demonstrates for the first time that equatorial Indian Ocean remote wind forcing may on occasions influence the internal Indonesian seas