Sea surface height variations in the Mindanao Dome region in response to the northern tropical Pacific winds
Sea surface height variations in the Mindanao Dome region in response to the northern tropical Pacific winds
复制标题
DOI：
10.1007/s00343-012-1155-2
复制
发表时间：
2012-07
影响因子：
--
通讯作者：
Dan Song;D. Hu;Fangguo Zhai
中科院分区：
文献类型：
--
作者：
Dan Song;D. Hu;Fangguo Zhai
棉兰老岛穹（MD）地区的海面高度（SSH）的变化被认为是北方太平洋的强变化之一。其强度仅弱于黑潮延伸区，与北太平洋副热带逆流区相当。利用1.5层简化重力模式，分析了该区域SSH的变化及其对北方热带太平洋风场的响应。该区域平均SSH距平主要表现为季节性变化，显著周期为0.5年和1年，ENSO时间尺度为2-7年，时间尺度超过8年。年度和长期的变化是非常强大的。这些变化基本上是对北方热带太平洋风的反应。在季节和厄尔尼诺/南方涛动时间尺度上，它们主要是由该区域以东的风异常造成的，这些风异常产生了向西传播的长Rossby波。在超过8年的时间尺度上，它们主要是由当地埃克曼抽水引起的。首次研究和讨论了MD地区SSH的长期变化及其对局地风场的响应。
Sea surface height (SSH) variability in the Mindanao Dome (MD) region is found to be one of the strong variations in the northern Pacific. It is only weaker than that in the Kuroshio Extension area, and is comparable to that in the North Pacific Subtropical Countercurrent region. Based on a 1.5-layer reduced gravity model, we analyzed SSH variations in this region and their responses to northern tropical Pacific winds. The average SSH anomaly in the region varies mainly on a seasonal scale, with significant periods of 0.5 and 1 year, ENSO time scale 2–7 years, and time scale in excess of 8 years. Annual and long-term variabilities are comparably stronger. These variations are essentially a response to the northern tropical Pacific winds. On seasonal and ENSO time scales, they are mainly caused by wind anomalies east of the region, which generate westward-propagating, long Rossby waves. On time scales longer than 8 years, they are mostly induced by local Ekman pumping. Long-term SSH variations in the MD region and their responses to local winds are examined and discussed for the first time.