Seasonal and intraseasonal modulation of near-inertial wind power associated with fluctuations in unidirectional wind speed in the Bay of Bengal

IF 2.2 3区地球科学 Q2 OCEANOGRAPHY Ocean Dynamics Pub Date : 2023-12-14 DOI:10.1007/s10236-023-01589-1

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Abstract

This study examines the seasonal and intraseasonal modulation of near-inertial wind power associated with fluctuations in unidirectional wind speed in the Bay of Bengal (BoB). For that purpose, we use concurrent measurements of high-resolution in situ near-surface current and wind speed from six moorings in the BoB. It is found that the annual mean of near-inertial wind power in the BoB shows roughly similar magnitude (0.25–0.35 mW m⁻²) at all the mooring locations. However, in response to the seasonal evolution of monsoonal wind forcing, near-inertial wind power shows significant annual variability, with a maximum during summer (~ 0.4–0.5 mW m⁻²) and fall (~ 0.3–0.4 mW m⁻²) and a minimum during winter (~ 0.1 mW m⁻²) and spring (~ 0.2 mW m⁻²). In addition, it is also found that modulation of near-inertial wind power due to summer monsoon intraseasonal oscillation (MISO), such as its magnitude, reaches as large as ~ 1 mW m⁻² at the mooring in the northern BoB during phases 3–4 of MISO. Using a high vertical resolution of current profile data, the near-inertial kinetic energy (NIKE) budget in the mixed layer in the northern BoB shows good temporal correspondence with the magnitude of the rate of change of NIKE and near-inertial wind power, with a maximum magnitude of the rate of change of NIKE lags the wind power by 24 hr. The NIKE budget also indicates that a significant portion of near-inertial wind power dissipates in the mixed layer and rarely energises the depth regime underneath the mixed layer.

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与孟加拉湾单向风速波动相关的近惯性风力的季节和季节内调制

摘要本研究探讨了与孟加拉湾（BoB）单向风速波动有关的近惯性风力的季节和季节内调制。为此，我们使用了来自孟加拉湾六个系泊站的高分辨率原位近表面海流和风速同步测量数据。结果发现，在所有系泊点，孟加拉湾近惯性风力的年平均值大致相同（0.25-0.35 mW m-2）。然而，随着季风胁迫的季节性演变，近惯性风功率显示出显著的年变化，夏季（约 0.4-0.5 mW m-2）和秋季（约 0.3-0.4 mW m-2）为最大值，冬季（约 0.1 mW m-2）和春季（约 0.2 mW m-2）为最小值。此外，研究还发现，在夏季季风季内振荡（MISO）的第 3-4 阶段，夏季季风季内振荡引起的近惯性风功率的调制，如其幅度，在北部 BoB 的锚泊处可达约 1 mW m-2。利用高垂直分辨率的海流剖面数据，北博波混合层的近惯性动能（NIKE）预算与近惯性动能变化率和近惯性风能的大小在时间上有很好的对应关系，近惯性动能变化率的最大值滞后风能 24 小时。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Ocean Dynamics 地学-海洋学

CiteScore

5.40

自引率

0.00%

发文量

审稿时长

6-12 weeks

期刊介绍： Ocean Dynamics is an international journal that aims to publish high-quality peer-reviewed articles in the following areas of research: Theoretical oceanography (new theoretical concepts that further system understanding with a strong view to applicability for operational or monitoring purposes); Computational oceanography (all aspects of ocean modeling and data analysis); Observational oceanography (new techniques or systematic approaches in measuring oceanic variables, including all aspects of monitoring the state of the ocean); Articles with an interdisciplinary character that encompass research in the fields of biological, chemical and physical oceanography are especially encouraged.