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arXiv 2103.09771physics.ao-ph
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安达曼海大气环流和主波样式的观测

General Circulation and Principal Wave Modes in Andaman Sea from Observations

S. R. Kiran

摘要:

目的:本研究旨在描述安达曼海的环流,并调查在该盆地的变化的主导模式。分析/观察结果:5月至9月,该区域的西南风较强,11月至2月,东北风相对较弱。夏季在印度尼西亚北海岸观测到强烈的负埃克曼抽吸。本文用简单的质量平衡法计算了安达曼-尼科巴群岛海峡(ANI)的水输运,发现ANI的输运与安达曼海月平均平均海平面距平(MSLA)同相。夏季通过大通道和十度通道的下垫面通量较高。在4月和10月,通过海峡的运输率最高。在同一个月,纬向表层洋流沿盆地东部边界加强,并与下降流的签名。调查结果:强烈的下降流发生在印度尼西亚北部海岸在夏季,当地被迫西南风。在4月至11月期间,有大量的水通过岛屿之间的海峡流入安达曼海。赤道Wyrtki喷流远程力开尔文波的下降流性质的盆地在4月和10月。安达曼海环流的特征是环流或涡旋,是半年模态罗斯贝波的表现。该盆地具有向西传播的长Rossby波包的特征,该波包从ANI海岸反射为向东传播的短罗斯贝波。新颖性:第一次尝试完全从观测中描述安达曼海环流的动力学。

英文摘要:

Objectives: This study intends to describe the Andaman Sea circulation and investigate the dominant modes of variability in the basin. Analysis/Observations: The domain experiences stronger South-westerly winds from May to September and relatively weaker North-easterlies from November to February. A strong negative Ekman pumping along the north coast of Indonesia is observed during Summer. The transport of water across the straits of Andaman and Nicobar Islands (ANI) is computed by simple mass balance and is found to be in phase with the monthly averaged Mean Sea Level Anomalies (MSLA) of Andaman Sea. There occurs high surface outflux through Great channel and Ten-Degree channel in Summer. In April and October, rate of transport through the straits is maximum. During the same months, meridional surface currents intensify along the eastern boundary of the basin and are associated with signatures of downwelling. Findings: Intense down welling occurs to the north coast of Indonesia during Summer, locally forced by south-westerlies. There occurs large influx of water into Andaman Sea between April and November through the straits between the islands. Equatorial Wyrtki jets remotely force Kelvin waves of downwelling nature in the basin during April and October. The circulation in Andaman Sea is characterised by gyres or vortices, which is the manifestation of Rossby waves of semi-annual mode. The basin has a characteristic 120-day mode of westward propagating long Rossby wave packets which reflect from the coast of ANI as eastward propagating short Rossby waves. Novelty: The first attempt to completely describe the dynamics of Andaman Sea circulation exclusively from observations.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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