Seasonal Variation of Tropical Cyclone Genesis and the Related Large-Scale Environments: Comparison between the Bay of Bengal and Arabian Sea Sub-Basins

Duan, Wen‐Shan; Yuan, Junpeng; Xu, Dongmei; Feng, Dian

doi:10.3390/atmos12121593

Cited by 15 publications

(5 citation statements)

References 31 publications

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“…Lower SSTs, such as 26 • C or lower, are predominantly observed in the western section, around the Arabian Peninsula and off the Somali Peninsula. These areas correspond to the wind-driven upwelling zone [47]. The difference in SST is more pronounced in the Arabian Sea compared to the Bay of Bengal, where SST generally decreases with latitude.…”

Section: General Tc Features In the Niomentioning

confidence: 87%

Tropical Cyclone-Induced Sea Surface Temperature Responses in the Northern Indian Ocean

Yu,

Lv,

Tan

et al. 2023

JMSE

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Tropical cyclones (TCs) exert a significant influence on the upper ocean, leading to sea surface temperature (SST) changes on a global scale. However, TC-induced SST responses exhibit considerable variability in the northern Indian Ocean (NIO), and the general understanding of these responses remains limited. This paper investigates the SST changes caused by 96 TCs over an 18-year period in the NIO. Through a composite analysis utilizing satellite SST data, a comprehensive study is conducted to examine the relationship between TC characteristics, including wind speed and translation speed, and the associated SST changes. The overall findings reveal that within a radius of 300 km from the TC center, SST decreases were observed at 1702 (86%) locations, with an average SST response to TC of −0.46 °C and a maximum decrease of −2.07 °C. The most significant reduction in SST typically occurred two days after the passage of TCs, followed by a gradual recovery period exceeding 15 days for the SSTs to return to their initial values. Consistent with findings in other ocean basins, stronger and slower-moving TCs induced more substantial cooling effects. Conversely, at 279 (14%) locations, particularly associated with TCs of weaker intensities, SST increases were observed following the TC passage. Notably, 140 of these locations were situated at low latitudes, specifically between 8° N and 15° N. This study provides a quantitative analysis of the comprehensive SST response to TCs in the NIO.

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Section: General Tc Features In the Niomentioning

confidence: 87%

Tropical Cyclone-Induced Sea Surface Temperature Responses in the Northern Indian Ocean

Yu,

Lv,

Tan

et al. 2023

JMSE

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“…Temporally, the NIO has two TC seasons per year, which are the pre-monsoon season (April-June) and the postmonsoon season (October-December). During the period of 1980-2019, the frequencies of TCs in the BoB and ARB were comparatively similar in the pre-monsoon season, but the number of TCs in the BoB was approximately 2.3 times higher than that of the ARB in the post-monsoon season [5]. Vertical wind shear was the primary contributor to TC genesis in the ARB in the post-monsoon season, whereas bothvertical wind shear and relative humidity dominated TC genesis in the BoB.…”

Section: Introductionmentioning

confidence: 89%

“…Vertical wind shear was the primary contributor to TC genesis in the ARB in the post-monsoon season, whereas bothvertical wind shear and relative humidity dominated TC genesis in the BoB. The BoB has more favorable TC genesis conditions than the ARB, especially during the post-monsoon season [5]. Previous studies have extensively investigated the variations in TC frequency using the best track data in the NIO, including the ARB and the BoB.…”

Section: Introductionmentioning

confidence: 99%

Climate control of tropical cyclone rapid intensification frequency in the north indian ocean

Wang

Hong

2022

Environ. Res. Commun.

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Rapid intensification (RI, ≥ 20 knots/24h) is essential to very severe cyclonic storm (VSCS) in the North Indian Ocean (NIO). Between 1980 and 2020, the annual numbers of VSCSs were strongly correlated with the annual numbers of RI-20 events during the pre-monsoon (April-June) and post-monsoon (October-December) periods in the Arabian Sea (ARB) and the Bay of Bengal (BoB). Singular value decomposition (SVD) analysis was applied to the sea surface temperature (SST) and the number of RI events in the pre-monsoon and post-monsoon seasons. The leading SVD mode explained ~85% (83%) of the total covariance during the pre-monsoon (post-monsoon). With an increase in the SST, the number of RI events increased in the ARB and the BoB during the pre-monsoon, and the number of RI events was enhanced in the ARB but reduced in the BoB during the post-monsoon. Decreased vertical wind shear was the primary contributor to the increased RI-20 events during the pre-monsoon. During the post-monsoon, decreased vertical wind shear and increased relative humidity contributed to increased RI-20 events in the ARB, while reduced absolute vorticity and decreased relative humidity contributed to decreased RI-20 events in the BoB. These results suggest an increased occurrence of VSCSs in both seasons in the ARB, and an increased (decreased) occurrence of VSCSs in the pre-monsoon (post-monsoon) in the BoB with increasing SST.

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“…SST, UOHC, atmospheric water vapour, and the genesis potential index (GPI) were all strongly associated with the growth and variability of ACE. According to Duan et al (2021), the lower and middle troposphere's relative humidity and vertical wind shear are the two key contributors to TC genesis. The combination of these two variables drives the bimodal seasonal cycle of TCs' in both the ARB and the BoB.…”

Section: Role Of Atmospherementioning

confidence: 99%

The appraisal of tropical cyclones in the North Indian Ocean: An overview of different approaches and the involvement of Earth’s components

2022

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This study aims to provide a comprehensive and balanced assessment of recent scientific studies on the evolution, temporal variability and prediction of tropical cyclones (TCs), focusing on the North Indian Ocean (NIO). The involvement of earth’s components in TC genesis and intensification has been elaborated in a confined way. The advancement of multidisciplinary approaches for comprehending the TCs is highlighted after a brief description of the involvement of oceanic, atmospheric, and land surface processes. Only a few studies illustrate how land surface plays a role in TC intensification; however, the role of latent heat flow, moisture, and convection in cyclogenesis is well documented. Despite two to 3 decades of advancement and significant development in forecasting techniques and satellite products, the prediction of TC’s intensity, dissipation, track, and landfall remains a challenge. The most noticeable improvements in NIO TC’s prediction have been achieved in the last couple of decades when concord techniques are utilized, especially the data assimilation methods and dynamical coupled atmosphere-ocean regional models. Through diverse methodologies, algorithms, parameterization, in-situ observational data, data mining, boundary layer, and surface fluxes, significant research has been done to increase the skills of standalone atmospheric models and air-sea coupled models. However, some crucial issues still exist, and it is suggested that they should be addressed in future studies.

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Seasonal Variation of Tropical Cyclone Genesis and the Related Large-Scale Environments: Comparison between the Bay of Bengal and Arabian Sea Sub-Basins

Cited by 15 publications

References 31 publications

Tropical Cyclone-Induced Sea Surface Temperature Responses in the Northern Indian Ocean

Tropical Cyclone-Induced Sea Surface Temperature Responses in the Northern Indian Ocean

Climate control of tropical cyclone rapid intensification frequency in the north indian ocean

The appraisal of tropical cyclones in the North Indian Ocean: An overview of different approaches and the involvement of Earth’s components

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