Intra-seasonal variability of Pacific-origin sea level anomalies around the Philippine Archipelago
Intra-seasonal variability of Pacific-origin sea level anomalies around the Philippine Archipelago
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DOI：
10.1007/s10872-015-0281-9
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发表时间：
2015-03
影响因子：
2.3
通讯作者：
Xiao Chen;B. Qiu;Xuhua Cheng;Y. Qi;Yan Du
中科院分区：
文献类型：
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作者：
Xiao Chen;B. Qiu;Xuhua Cheng;Y. Qi;Yan Du
利用合并测高SLA测量和涡旋分辨海洋模式输出，研究了菲律宾群岛周围太平洋海平面异常（SLA）的季节内变化。结果表明，热带北太平洋的SLA信号在季节内以斜压Rossby波的形式向西传播。这些Rossby波信号撞击菲律宾东海岸后，转化为沿岸捕获波（CTW），沿菲律宾群岛沿岸顺时针沿着传播，通过锡布图海峡和民都洛海峡进入南海东部。但是，SLA信号不能逆时针传播，不能通过吕宋海峡进入南海东部。涡分辨模式清楚地识别了季节内的海浪过程。与来自内太平洋的远距离信号相比，沿岸风强迫对SLA信号的影响显得微不足道。虽然在模式模拟中确定，未来的观测需要验证的季节内CTW环绕菲律宾群岛。
Intra-seasonal variability of sea level anomalies (SLAs) originated in the Pacific Ocean around the Philippine Archipelago was investigated using merged altimetry SLA measurements and eddy-resolving ocean model outputs. The results suggest the SLA signals from the tropical North Pacific propagate westward as baroclinic Rossby waves on an intra-seasonal time scale. Upon impinging the east coast of the Philippines, these Rossby wave signals transform into coastal trapped waves (CTWs), propagate clockwise along the coast of the Philippine Archipelago and enter into the eastern South China Sea (SCS) through the Sibutu Passage and Mindoro Strait. The SLA signals, however, cannot propagate anticlockwise and enter into the eastern SCS through the Luzon Strait. The intra-seasonal oceanic wave processes are clearly identified by the eddy-resolving model. The effect of along-shore wind forcing on the SLA signals appears insignificant when compared with the remote signals coming from the interior Pacific. While identified in the model simulation, future observations are needed to verify the intra-seasonal CTWs encircling the Philippine Archipelago.