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Chakraborty, Arun
- A Brief Study of the Relationship Between Selected Geopotential Heights and Vertically Integrated Moisture Flux Divergence Over India
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Authors
Amarjeet
1,
Vineet Sharma
1,
Anil Kumar Gupta
2,
Arun Chakraborty
1,
Akshay Kumar Sagar
1,
Sakshi Sharma
1
Affiliations
1 Centre for Ocean, River, Atmosphere and Land Sciences (CORAL), Indian, Institute of Technology, Kharagpur, West Bengal, India – 721302., IN
2 Department of Geology and Geophysics, Indian Institute of Technology, Kharagpur, West Bengal, India – 721302., IN
1 Centre for Ocean, River, Atmosphere and Land Sciences (CORAL), Indian, Institute of Technology, Kharagpur, West Bengal, India – 721302., IN
2 Department of Geology and Geophysics, Indian Institute of Technology, Kharagpur, West Bengal, India – 721302., IN
Source
Journal of Environment and Sociobiology, Vol 19, No 2 (2022), Pagination: 193-202Abstract
In this study, an analysis of the relationship of 500, 700, and 850 hPa geopotential heights (GpH) with vertically integrated moisture flux divergence is examined for two selected sets of years named Dry and Wet. First, a comparison of the four different datasets, ERA-5, JRA-55, NCEP/NCAR, and MERRA-2, is done to look out for the variations and trends of geopotential SS heights from 1980-2021 and to select the best dataset for the whole analysis. Though all the datasets provide more or less the same variations and trends (except NCEP/NCAR), only ERA-5 is chosen on basis of high spatial resolution (0.25° × 0.25°) data. From the rainfall data, the dry and wet years are selected based on the Indian Meteorological Department (IMD) criteria. The variations of the standardized anomaly of different GpH are examined with the vertically integrated moisture flux divergence (VIMFD) in the selected dry and wet years. All the GpH are found to depict the condition of the less (more) trough (low-pressure area) over central India and the Bay of Bengal (BB), coinciding with the less (more) convergence of vertically integrated moisture flux (VIMF) in JJAS season of dry (wet) years.Keywords
Geopotential Heights (GpH), Vertically Integrated Moisture Flux Divergence (VIMFD), Dry and Wet Years.References
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- Evolution in Relationship Between Mascarene Highs and Indian Summer Monsoon In Recent Times
Abstract Views :155 |
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Authors
Vineet Sharma
1,
Amarjeet
1,
Arun Chakraborty
1,
Abhishek Kumar
1,
Biplab Sadhukhan
1,
Swarnali Dhar
1
Affiliations
1 Centre for Ocean, River, Atmosphere & Land Sciences (CORAL), IIT Kharagpur, West Bengal, India., IN
1 Centre for Ocean, River, Atmosphere & Land Sciences (CORAL), IIT Kharagpur, West Bengal, India., IN
Source
Journal of Environment and Sociobiology, Vol 19, No 2 (2022), Pagination: 283-293Abstract
Mascarene Highs (MH) is an important semi-permanent feature of Indian summer Monsoon(ISM). It is a subtropical anticyclonic feature located in the Southern Indian Ocean. The relationship between ISMR and Mascarenes highs is quite complex and is attributed to thermal and pressure gradients developed between the two regions (particularly during JJAS season) developed due to differential heating of land and water in the two regions. Global warming hiatus (comparative cooling of ocean waters in western Pacific) post 1998 have led to redistribution of thermal energy across the Indonesian through flow to the Indian ocean as a result the region has experienced rising SSTs. Declining Mean Sea Level Pressure (MSLP), rising SST and latitudinal and longitudinal shifts in the mean annual location of the centre of MH have led to reconfiguration of the relationship of Mascarene High with Indian Summer Monsoon. This changing relationship may be considered as one of many factors controlling recent revival/strengthening of Indian Summer Monsoon in recent times.Keywords
Mascarene Highs (MH), Anticyclone, Global Warming Hiatus, Indian Summer Monsoon (ISM).References
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