What question did this study set out to answer?

To examine the climatological trends, inner-core rainfall changes, and atmospheric-oceanic triggers associated with rapidly intensifying tropical cyclones in the North Indian Ocean between 1990 and 2019.

June 24, 2021International Journal of Climatology

On occurrence of rapid intensification and rainfall changes in tropical cyclones over the North Indian Ocean

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Authors

BVBuri VinodhkumarNational Institute of Technology Rourkela NBNanda Kishore Reddy BusireddyNew York University Abu Dhabi KAKumar AnkurUniversity of Alabama in Huntsville

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Implication

Climatological analysis reveals triggers and rainfall shifts driving rapid cyclone intensification in the North Indian Ocean, highlighting coastal vulnerability.

Key Points

To examine the climatological trends, inner-core rainfall changes, and atmospheric-oceanic triggers associated with rapidly intensifying tropical cyclones in the North Indian Ocean between 1990 and 2019.
Analyzed 30 years (1990–2019) of tropical cyclone records in the North Indian Ocean basin, evaluating track, translational speed, and inner-core precipitation changes.
Defined rapid intensification as a maximum sustained surface wind increase of at least 30 knots (15.4 m/s) over a 24-hour period (corresponding to the 93rd percentile using 3-minute sustained winds).
Performed composite analyses of environmental variables including precipitable water, surface heat flux, cyclone heat potential, and vertical wind shear prior to and during intensification onset.
Identified 46 tropical cyclones (~38% of total storms) exhibiting rapid intensification at 1–2 events per year, with a significant frequency increase observed after 2000 and peak occurrence during the post-monsoon season.
Observed that 48% of events initiated rapid intensification during the depression stage within 12–24 hours, alongside an inner-core rainfall rate increase of ~3 mm/hr from 12 hours before onset to the time of intensification.
Demonstrated that intensification is favored by high precipitable water (~55 mm), strong surface flux (500 W/m²), elevated cyclone heat potential (50–60 kJ/cm²), and moderate vertical shear (6–8 m/s), with most intensifying cyclones making landfall in eastern India.

Cite This Study

Vinodhkumar et al. (2021) studied this question.

synapsesocial.com/papers/6a6fc9ec75498292b7092bce https://doi.org/10.1002/joc.7268

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Implication

Climatological analysis reveals triggers and rainfall shifts driving rapid cyclone intensification in the North Indian Ocean, highlighting coastal vulnerability.

On occurrence of rapid intensification and rainfall changes in tropical cyclones over the North Indian Ocean

Discussion

Member takes

Implication

Key Points

Cite This Study

On occurrence of rapid intensification and rainfall changes in tropical cyclones over the North Indian Ocean

Discussion

Member takes

Implication

Key Points

Cite This Study

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