Journal of Earth System Science ( IF 1.3 ) Pub Date : 2021-04-28 , DOI: 10.1007/s12040-021-01568-4 Vineet Jain , P Amol , S G Aparna , V Fernando , A Kankonkar , V S N Murty , A M Almeida , Areef A Sardar , S T Khalap , N P Satelkar , S Ghatkar , P A Tari , M G Gaonkar , R Khedekar
Abstract
Deep-sea moorings in the equatorial Indian Ocean were first deployed by India in the year 2000, and currents were measured at three locations (\(77^\circ \hbox {E}\), \(83^\circ \hbox {E}\), and \(93^\circ \hbox {E}\)) on the equator. In this paper, we present two decades of current observations from these moorings and discuss how the moorings have evolved with time. The observations show that the 180-day (90-day) period dominates the surface and mid-depth (bottom) circulation. Though the Wyrtki Jets are strong, the near-surface currents do not show any clear semi-annual reversals. The reversals become evident only below 100 m.
Research Highlights
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1.
Twenty years of ocean current data collected at the equatorial Indian Ocean
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2.
Bottom current data show strong intraseasonal variability
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3.
Upward phase propagation associated with the semi-annual cycle more prominent for the mid-depth currents
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4.
The semi-annual reversals not evident every year near the surface
中文翻译:
赤道印度洋的近二十年来的观测
摘要
印度于2000年首次在赤道印度洋部署深海系泊设备,并在三个位置测量了洋流(\(77 ^ \ circ \ hbox {E} \),\(83 ^ \ circ \ hbox { E} \)和赤道上的\(93 ^ \ circ \ hbox {E} \))。在本文中,我们将介绍来自这些系泊设备的最新二十年观测结果,并讨论系泊设备如何随着时间演变。观测结果表明,在180天(90天)的周期内,地表和中深度(底部)环流占主导地位。尽管Wyrtki射流很强,但近地表电流并没有显示任何明显的半年度反转。逆转仅在100 m以下才变得明显。
研究重点
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1。
在赤道印度洋收集的二十年洋流数据
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2。
底部当前数据显示强烈的季节内变异性
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3。
与半年周期相关的向上相位传播在中深度海流中更为突出
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4,
半年一次的逆转每年在地表附近都不明显