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On the spatial structure and time evolution of shamal winds over the Arabian Sea – a case study through numerical modelling.

DRS at CSIR-National Institute of Oceanography

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Title On the spatial structure and time evolution of shamal winds over the Arabian Sea – a case study through numerical modelling.
 
Creator VinodKumar, K.
Seemanth, M.
Vethamony, P.
Aboobacker, V.M.
 
Subject winds
monsoons
numerical taxonomy
atmospheric temperature
 
Description Shamal events are extra-tropical weather systems which occur in winter (cold and dry winds) as well as summer (hot and humid winds) with strong northwesterly or northerly winds blowing over the Arabian Peninsula. We have used Weather Research and Forecasting (WRF) model to simulate a major winter shamal event (having duration of 3–5?days), which occurred in 2008 and analysed the spatial structure and time evolution of shamal winds over the Arabian Sea (AS). The study reveals that horizontally, shamal winds extend upto 14°N and bring out significant changes in the atmospheric temperature—longitudinally from Arabian coast to west coast of India; its vertical extension is upto to approximately 8 km near Oman and approximately 3km near Ratnagiri coast. Along the Arabian coast a temperature drop of 12°C is observed and along west coast of India a drop of 5°C. It gets dissipated when northeast monsoon winds dominate. Its speed reduces from 15ms-1 (Oman coast) to 9ms-1 (central AS) as it propagates into AS. However, it must be noted that the present work is limited to a case study and hence, the southerly extension of the phenomenon and the associated changes in air temperature should not be considered a climatological reference. The shamal events may influence the wind induced circulation, heat flux and stratification in the AS, and these need to be analysed further.
 
Date 2014-05-06T11:35:27Z
2014-05-06T11:35:27Z
2014
 
Type Journal Article
 
Identifier International Journal Of Climatology, vol.34(6); 2014; 2122–2128.
no
http://drs.nio.org/drs/handle/2264/4531
 
Language en
 
Relation Bioorg_Med_Chem_Lett_24_2863.jpg
 
Rights This is a preprint of an article published in [International Journal of Climatology, DOI: 10.1002/joc.3819]”and located at the following Wiley URL: http://onlinelibrary.wiley.com/doi/10.1002/joc.3819/abstract . Copyright[2013] Royal Meteorological Society
 
Publisher Royal Meteorological Society