Cyclones and Depressions Over North Indian Ocean During 1996

Dikshit, S. K.; Desai, Damini; Bhandari, Sharmilla

doi:10.54302/mausam.v48i3.4256

Cited by 2 publications

(1 citation statement)

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“…However, particularly, node 7, which has four events from summer season and one event in November, exhibited a unique pattern, that is, cross‐equatorial flow coming from the southeastern Indian Ocean and a strong LPS over the study region and Bay of Bengal (Figure 3g). It is observed that all five events of node 7 are the result of tropical cyclones formed over the Bay of Bengal (9–11 May 1990, Gupta et al, 1991; 6 November 1996, Dikshit et al, 1997; 15 May 2020, Kashyapi & Shripad, 2021). The nodes 7 and 9 clearly indicate that its source of moisture is Bay of Bengal and it accounts to 15.43% of the total events.…”

Section: Resultsmentioning

confidence: 99%

Synoptic circulation patterns of urban floods for the city of Hyderabad

Mohammed,

Regonda

2023

Intl Journal of Climatology

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Synoptic fingerprinting of flood driving rainfall events over the Hyderabad city, India were assessed through an unsupervised machine learning technique—self‐organizing maps (SOM) for the period 1979–2020. Flood dates were identified using nonscientific data sources, and then large‐scale climate variables, that is, integrated vapour transport (IVT) and geopotential height at 500 hPa (Z500) along with rainfall at daily scale were considered. SOM was applied on IVT and results indicated large spatial scale‐ and season‐specific mechanisms in addition to local circulation systems—this highlights SOM's ability to cluster circulation mechanisms as per the relevance. The rainy seasons, that is, monsoon and postmonsoon showed well‐known moisture pathways. While synoptic systems can be easily linked with monsoon and postmonsoon mechanisms, it is interesting to note that the local systems exist even during the monsoon and postmonsoon season in addition to the summer season. Spatial patterns of Z500 corresponding to SOM nodes of IVT showed the presence of low‐pressure systems (LPSs), tropical cyclones and trough systems. Further analysis was performed, and a total of 35 atmospheric rivers (ARs) were identified. Plots of back trajectories for the selected AR events indicated that Arabian Sea is the main source of moisture in the monsoon season followed by Bay of Bengal for postmonsoon and tropical cyclones in summer season events. Additionally, moisture from land is also observed as another source of moisture. Back‐trajectory analysis further indicated AR‐LPS interaction during the monsoon and ARs feeding moisture to LPSs. Overall, well‐known and season‐specific synoptic systems that brought significant rainfall to the study region were identified by the SOM. The proposed framework is adaptable for different locations, and as floods in cities across the globe are on the rise, these findings will have a prominent role in urban flood forecasting and management.

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Section: Resultsmentioning

confidence: 99%

Synoptic circulation patterns of urban floods for the city of Hyderabad

Mohammed,

Regonda

2023

Intl Journal of Climatology

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Phytoplankton bloom in the Bay of Bengal during the northeast monsoon and its intensification by cyclones

Vinayachandran

Mathew

2003

Geophysical Research Letters

183

133

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Satellite derived chlorophyll a imageries are used to present a phytoplankton bloom in the Bay of Bengal during the northeast monsoon (November–February) and the mechanisms that can upwell nutrients to sustain the bloom are investigated using sea level anomalies and winds. OCTS and SeaWiFS chlorophyll a images show that there is a phytoplankton bloom in the southwestern part of the bay during November–January. The chlorophyll a concentration of the bloom can be as high as 2 mg m−3 compared to near zero value before the bloom. Open ocean upwelling driven by Ekman pumping causes the bloom. The cyclones which are common during this period lead to localized intense blooms in the western Bay of Bengal. The offshore extent and the intensity of the bloom varies from year to year. The bloom was absent during 1997 due to weak Ekman pumping.

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Cyclones and Depressions Over North Indian Ocean During 1996

Cited by 2 publications

References 0 publications

Synoptic circulation patterns of urban floods for the city of Hyderabad

Synoptic circulation patterns of urban floods for the city of Hyderabad

Phytoplankton bloom in the Bay of Bengal during the northeast monsoon and its intensification by cyclones

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