Influence of atmospheric rivers on the Leeuwin Current system
Influence of atmospheric rivers on the Leeuwin Current system
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DOI：
10.1007/s00382-020-05228-z
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发表时间：
2018-12
期刊：
影响因子：
4.6
通讯作者：
T. Shinoda;W. Han;L. Zamudio;Xue Feng
中科院分区：
文献类型：
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作者：
T. Shinoda;W. Han;L. Zamudio;Xue Feng
以前的工作已经证明，由于与大气河流(Ars)相关的强烈地面风，海洋对东北太平洋包括北美西海岸沿岸的大气河流(Ars)有强烈的响应。最近一项关于AR全球分布的研究也表明，东南印度洋是AR活动相对较强的地区之一。本文研究了Ars对印度洋主要边界流之一的Leeuwin流系的影响。通过一个高分辨率海洋再分析(0.08°HYCOM)，证明了与印度洋东南部典型ARS相关的风可以在澳大利亚西海岸产生强烈的极地沿岸流和海平面上升。利用HYCOM再分析、长期AR资料和验潮仪资料，建立了与澳大利亚西海岸登陆ARS相关的上层洋流和海面高度(SSH)的合成。在复合材料中发现了Ars产生的极向电流的增强，其增强的幅度与Leeuwin电流本身的强度相当。结果还表明，沿西海岸的SSH和沿岸流的波动沿南海岸一直传播到澳大利亚的东南海岸(太平洋一侧)。在澳大利亚西海岸和南海岸的验潮仪数据中也发现了SSH沿海岸的传播。
Previous work has demonstrated the strong ocean response to atmospheric rivers (ARs) in the northeast Pacific including coastal currents along the west coast of North America, because of strong surface winds associated with ARs. A recent study on the global distribution of ARs also suggests that the southeast Indian Ocean is one of the areas of relatively strong AR activity. This study investigates the influence of ARs on the Leeuwin Current system, which is one of the major boundary currents in the Indian Ocean. It is demonstrated that winds associated with typical ARs in the southeast Indian Ocean can generate strong poleward coastal currents and sea level rise along the west coast of Australia using a high-resolution ocean reanalysis (0.08° HYCOM). The composite of upper ocean currents and sea surface height (SSH) associated with landfalling ARs along the west coast of Australia is constructed using the HYCOM reanalysis, long-term AR data set, and tide gauge data. The enhancement of the poleward currents generated by ARs is found in the composite, and the magnitude of the enhancement is comparable to the strength of the Leeuwin Current itself. The results also indicate that the fluctuation of SSH and coastal currents along the west coast propagates along the southern coast all the way to the southeast coast (Pacific side) of Australia. The SSH propagation along the coasts is also detected in the tide gauge data in the west and southern coasts of Australia.