Pathways of intraseasonal Kelvin waves in the Indonesian Throughflow regions derived from satellite altimeter observation
Pathways of intraseasonal Kelvin waves in the Indonesian Throughflow regions derived from satellite altimeter observation
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DOI：
10.1080/16742834.2016.1208047
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发表时间：
2016-07
影响因子：
2.3
通讯作者：
Tengfei Xu;Zexun Wei;Guojiao Cao;Shu-jiang Li
中科院分区：
文献类型：
--
作者：
Tengfei Xu;Zexun Wei;Guojiao Cao;Shu-jiang Li
摘要利用AVISO提供的网格化海平面异常（SLA）数据集，对印度尼西亚赤道气流（ITF）区季节内Kelvin波的传播进行了跟踪。沿着苏门答腊和爪哇海岸季节内SLA的大均方根值与赤道印度洋季节内Kelvin波的传播密切相关。这些开尔文波进一步被发现在龙目海峡传播遵循不同的路径。路径A向东传播穿过松巴海峡和萨武海，到达翁拜海峡。路径B深入龙目岛，向北传播到达马卡萨尔海峡。路径C沿松巴岛西南海岸向东南沿着传播。赤道开尔文波从赤道印度洋传播到龙目海峡大约需要15天，进入马卡萨尔和翁拜海峡大约需要5天。Kelvin波诱导的SLA在ITF区域中持续另外5天，然后随后减小。这些季内开尔文波沿沿着路径A、B和C的相速度分别为1.91-2.86、1.69和1.96 m/s--与开尔文波的前两个斜压模态一致。
Abstract The gridded sea level anomaly (SLA) data-set provided by AVISO is used to track the propagation of intraseasonal Kelvin waves in the Indonesian Throughflow (ITF) region. The large root mean square of intraseasonal SLA along the Sumatra and Java coast is closely related to the propagation of intraseasonal Kelvin waves that derive from the equatorial Indian Ocean. These Kelvin waves are further found to propagate following different pathways at the Lombok Strait. Pathway A propagates eastward throughout the Sumba Strait and Savu Sea to reach the Ombai Strait. Pathway B penetrates into Lombok and propagates northward to reach the Makassar Strait. Pathway C propagates southeastward along the southwest coast of the Sumba Island. The equatorial Kelvin waves take around 15 days to travel from the equatorial Indian Ocean to Lombok Strait, and around 5 days to penetrate into the Makassar and Ombai straits. The Kelvin wave-induced SLA persists in the ITF region for an additional 5 days and then diminishes subsequently. The phase speeds of these intraseasonal Kelvin waves along Pathways A, B, and C are 1.91–2.86, 1.69, and 1.96 m s−1, respectively—in agreement with the first two baroclinic modes of Kelvin waves.