Do East Australian Current anticyclonic eddies leave the Tasman Sea
Do East Australian Current anticyclonic eddies leave the Tasman Sea
复制标题
东澳大利亚洋流反气旋涡流离开塔斯曼海吗
DOI：
10.1002/2015jc011026
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发表时间：
2015
影响因子：
--
通讯作者：
K. Ridgway
中科院分区：
文献类型：
--
作者：
G. Pilo;P. Oke;T. Rykova;R. Coleman;K. Ridgway
利用卫星测高和高分辨率模型输出，我们分析了起源于东澳大利亚洋流（EAC）分离点附近的大型、长期反气旋涡旋的路径。我们发现，25-30%的这些漩涡向南传播，塔斯马尼亚岛周围，离开塔斯曼海，并在大澳大利亚湾衰减。由于塔斯马尼亚东部的卫星采样较差，这条路径以前没有记录。当涡旋向南传播时，它们经常在接近恒定的纬度上“停滞”几个月。沿着路径，涡旋变得越来越正压。涡旋强度主要受与其他涡旋合并的影响，否则逐渐衰减。与反气旋涡旋相关的地表温度异常随着它们的传播而变化，而地表盐度异常随着它们的传播而趋于保持相对不变。
Using satellite altimetry and high-resolution model output we analyze the pathway of large, long-lived anticyclonic eddies that originate near the East Australian Current (EAC) separation point. We show that 25-30% of these eddies propagate southward, around Tasmania, leave the Tasman Sea, and decay in the Great Australian Bight. This pathway has not been previously documented owing to poor satellite sampling off eastern Tasmania. As eddies propagate southward, they often "stall" for several months at near-constant latitude. Along the pathway eddies become increasingly barotropic. Eddy intensity is primarily influenced by merging with other eddies and a gradual decay otherwise. Surface temperature anomaly associated with anticyclonic eddies changes as they propagate, while surface salinity anomaly tends to remain relatively unchanged as they propagate.