Air-sea interactions and Bay of Bengal basin wide variability with respect to long tracked cyclone ‘Viyaru’

IF 1.8 4区地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS

Journal of Atmospheric and Solar-Terrestrial Physics Pub Date : 2024-11-01 DOI:10.1016/j.jastp.2024.106382

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引用次数: 0

Abstract

The Bay of Bengal (BoB) is a potentially active region for the formation of the Tropical Cyclones (TCs) and accounts for about 6% of the global annual total number of tropical storms. These TCs occur during the pre-monsoon (March–May) and post-monsoon (October–November) seasons over the BoB. Among all the pre-monsoon cyclones that occurred from 1993 to 2019, we have identified that the “Viyaru” is a typical one originated in the southern BoB, propagated approximately through the middle of the bay, and made landfall over the northern BoB. The cyclonic storm Viyaru caused a basin-scale sea surface cooling of 0.35 °C by increasing the mixed layer depth by 3.5 m over the Bay of Bengal. An analysis of mixed layer heat budget terms infers that reduced short wave radiation and increased latent heat fluxes as the key factors responsible for basin-wide cooling associated with the Viyaru cyclone. We have also found that the enhanced entrainment processes even after the dissipation of the Viyaru cyclone had resulted in a post-cyclone basin-wide cooling tendency over the Bay of Bengal. The present study exemplifies the role of a pre-monsoon cyclone (Viyaru) in impacting the Bay of Bengal basin-scale variability of surface Physical Oceanographic variables and associated processes.

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海气相互作用和孟加拉湾海盆大范围变化与长轨迹气旋 "维亚鲁 "有关

孟加拉湾（BoB）是热带气旋（TCs）形成的潜在活跃区域，每年的热带风暴数量约占全球总数的 6%。这些热带气旋多发生在季风前（3 月至 5 月）和季风后（10 月至 11 月）的季节。在 1993 年至 2019 年发生的所有季风前气旋中，我们发现 "维亚鲁 "是一个典型的气旋，它起源于渤海湾南部，大约从渤海湾中部传播，并在渤海湾北部登陆。气旋风暴 "维亚鲁 "使孟加拉湾上空的混合层深度增加了 3.5 米，造成海盆尺度海面降温 0.35 °C。对混合层热量预算项的分析表明，短波辐射的减少和潜热通量的增加是造成与 Viyaru 气旋有关的全海盆降温的关键因素。我们还发现，即使在维亚鲁气旋消散后，增强的夹带过程也导致了气旋后孟加拉湾全海盆降温的趋势。本研究说明了季风前气旋（维亚鲁气旋）在影响孟加拉湾海盆尺度表面物理海洋学变量变化及相关过程方面所起的作用。

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来源期刊

Journal of Atmospheric and Solar-Terrestrial Physics 地学-地球化学与地球物理

CiteScore

4.10

自引率

5.30%

发文量

审稿时长

6 months

期刊介绍： The Journal of Atmospheric and Solar-Terrestrial Physics (JASTP) is an international journal concerned with the inter-disciplinary science of the Earth''s atmospheric and space environment, especially the highly varied and highly variable physical phenomena that occur in this natural laboratory and the processes that couple them. The journal covers the physical processes operating in the troposphere, stratosphere, mesosphere, thermosphere, ionosphere, magnetosphere, the Sun, interplanetary medium, and heliosphere. Phenomena occurring in other "spheres", solar influences on climate, and supporting laboratory measurements are also considered. The journal deals especially with the coupling between the different regions. Solar flares, coronal mass ejections, and other energetic events on the Sun create interesting and important perturbations in the near-Earth space environment. The physics of such "space weather" is central to the Journal of Atmospheric and Solar-Terrestrial Physics and the journal welcomes papers that lead in the direction of a predictive understanding of the coupled system. Regarding the upper atmosphere, the subjects of aeronomy, geomagnetism and geoelectricity, auroral phenomena, radio wave propagation, and plasma instabilities, are examples within the broad field of solar-terrestrial physics which emphasise the energy exchange between the solar wind, the magnetospheric and ionospheric plasmas, and the neutral gas. In the lower atmosphere, topics covered range from mesoscale to global scale dynamics, to atmospheric electricity, lightning and its effects, and to anthropogenic changes.