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Interannual variability of convective activity over the tropical Indian Ocean during the El Nino/La Nina events

Bansod, SD (2011) Interannual variability of convective activity over the tropical Indian Ocean during the El Nino/La Nina events. International Journal of Remote Sensing, 32 (19). pp. 5565-5582.

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Abstract

Convection over the tropical Indian Ocean is important to the global and regional climate. This study presents the monthly climatology of convection, inferred from the outgoing longwave radiation (OLR), over the tropical Indian Ocean. We also examine the impact of El Niño/La Niña events on the convection pattern and how variations in convection over the domain influence the spatial rainfall distribution over India. We used 35 recent years (1974–2008) of satellite-derived OLR over the area, the occurrence of El Niño/La Niña events and high resolution grid point rainfall data over India. The most prominent feature of the annual cycle of OLR over the domain is the movements of convection from south-east to north and north-west during the winter to the summer monsoon season. This feature represents the movement of the inter-tropical convergence zone (ITCZ). The climatology of OLR during the winter months (December–February) over the domain is characterized by high subsidence over central India with a decrease of OLR values towards the north and south. Moderate convection is also seen over the Himalayan Range and the south-east Indian Ocean. In contrast, during the summer (June–September) the OLR pattern indicates deep convection along the monsoon trough and over central India, with subsidence over the extreme north-west desert region.

Item Type: Article
Additional Information: Copyright of this article belongs to Taylor and Francis.
Uncontrolled Keywords: Annual cycle; Arabian Sea; Bay of Bengal; Central India; Convection patterns; Convective activity; Convergence zones; Data sets; Deep convection; Domain influence; Equatorial Indian Ocean; High-resolution grids; Indian ocean; Interannual variability; Outgoing longwave radiation; Prominent features; Rainfall data; Regional climate; Seasonal scale; Spatial rainfall; Spatial variability; Summer monsoon; Summer monsoon rainfall; Tropical Indian ocean; West coast; Winter months, Atmospheric thermodynamics; Climatology; Natural convection; Nickel compounds; Oceanography; Subsidence; Tropics, Rain, annual variation; convective system; El Nino; error correction; intertropical convergence zone; La Nina; longwave radiation; monsoon; rainfall; satellite data; spatial distribution, Indian Ocean; Indian Ocean (Equatorial); Indian Ocean (Tropical)
Subjects: Meteorology and Climatology
Depositing User: IITM Library
Date Deposited: 11 Aug 2014 11:01
Last Modified: 11 Aug 2014 11:01
URI: http://moeseprints.incois.gov.in/id/eprint/712

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