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Investigation on the consequential features of Southwest Monsoon-2007 Onset and Super cyclone "Gonu" using Satellite, Model and Ground-based data

Harikumar, R and Varikoden, H and Babu, CA and Vishnu, R and Mohan Kumar, G (2014) Investigation on the consequential features of Southwest Monsoon-2007 Onset and Super cyclone "Gonu" using Satellite, Model and Ground-based data. Journal of Indian Geophysical Union, 18. pp. 319-329.

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Abstract

Onset features of the Summer monsoon-2007 were analyzed using data from five different sources, namely,the Tropical Rainfall Measuring Mission (TRMM) 3-hourly rainfall, National Centers for Environmental Prediction/National Center for Atmospheric Research (NCEP/NCAR) wind reanalysis data set, NOAA Outgoing Longwave Radiation (OLR), cloud imageries from the meteosat satellite,cloud base height and cloud occurrence frequency from a ground-based Vaisala Laser Ceilometer at Thiruvananthapuram. On the day of onset, 33 mm of rainfall was registered by TRMM satellite over south Kerala region with 80% cloud frequency and an averaged cloud base height of 2 km. On the next day, the formation of ‘Gonu’ super cyclone as a consequence of the convergence of monsoon onset surge in the Arabian Sea has caused the dissipation of cloud bands in the Arabian Sea and in the Bay of Bengal, except over the region of the system. This caused a lull situation for about ten days after the India Meteorological Department (IMD) declared monsoon onset. In fact, the remarkable characteristics of onset, such as deepening of westerlies and strengthening of low level jet streams were observed only after two weeks of IMD declared monsoon onset. Another unique behavior of 2007 monsoon onset was that the Arabian Sea branch of monsoon onset surge has advanced faster than the Bay of Bengal branch in the early stage.

Item Type: Article
Additional Information: Copyright of this article belongs to Journal of Indian Geophysical Union
Uncontrolled Keywords: Southwest Monsoon-2007; Super Cyclone; Gonu; Tropical Rainfall Measuring Mission
Subjects: Meteorology and Climatology
Depositing User: IITM Library
Date Deposited: 17 Aug 2015 05:07
Last Modified: 17 Aug 2015 05:07
URI: http://moeseprints.incois.gov.in/id/eprint/2732

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