Changes in extreme rainfall events in the recent decades and their linkage with atmospheric moisture transport
Global and Planetary Change, ISSN: 0921-8181, Vol: 221, Page: 104047
2023
- 5Citations
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Most Recent News
Investigators from Cochin University of Science and Technology Target Global and Planetary Change (Changes In Extreme Rainfall Events In the Recent Decades and Their Linkage With Atmospheric Moisture Transport)
2023 MAR 29 (NewsRx) -- By a News Reporter-Staff News Editor at Ecology Daily News -- Research findings on Environment - Global and Planetary Change
Article Description
In the present study, we have examined extreme rainfall events during the southwest monsoon and their relationship with vertically integrated atmospheric moisture transport. For the analysis, we have used daily rainfall data from IMD, wind and humidity data from NCEP from 1951 to 2020. Extreme rainfall events are identified when the daily rainfall value exceeds three times the standard deviation and also this rainfall amount exceeds the threshold value of 100 mm day −1 in a grid point on the spatial domain. The entire study period was divided into the first (1951–1985) and the second (1986–2020) epochs. The significant epochal differences in some key aspects of extreme rainfall events related to moisture transport mechanisms were examined in detail. For the selected epochs, distinct variabilities in monsoon rainfall were observed, especially in the northern parts of India. Furthermore, we have observed spatial variability in the frequency of occurrence of extreme rainfall events, the Central Indian region indicates an increasing trend in the frequency and its relative contribution. Whereas a significant negative trend is found in the northeast sector of the Indian subcontinent. Moreover, prominent moisture sources and their pathways that account for the extreme events were also identified using a 5-day back trajectory. Comparing the two epochs, a notable westward shift was obtained in the seasonal moisture flux and trajectories of selected rainfall events in the second epoch. The moisture from the Arabian Sea, Bay of Bengal and the Red Sea regions were contributing primarily towards the extreme rainfall events over the Indian subcontinent. In certain cases, land regions of northeast India and the Ganga basin played a crucial role in generating ample moisture. Moisture River (MR) patterns associated with extreme rainfall events were identified using vertically integrated moisture flux. During the last two decades of the study period, the MR patterns are observed to be more intense. The MR patterns are significantly influenced by the low-level wind patterns in addition to the prominent role of atmospheric moisture.
Bibliographic Details
http://www.sciencedirect.com/science/article/pii/S0921818123000206; http://dx.doi.org/10.1016/j.gloplacha.2023.104047; http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=85149722718&origin=inward; https://linkinghub.elsevier.com/retrieve/pii/S0921818123000206; https://dx.doi.org/10.1016/j.gloplacha.2023.104047
Elsevier BV
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