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Oceanic upwelling and downwelling processes in waters off the west coast of India

Rao, AD and Joshi, M and Ravichandran, M (2008) Oceanic upwelling and downwelling processes in waters off the west coast of India. Ocean Dynamics, 58 (3-4). pp. 213-226. ISSN 1616-7228

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A three-dimensional model based on the Princeton Ocean Model (POM) has been implemented to study the circulation of the west coast of India. The model uses a curvilinear orthogonal horizontal grid with higher resolution near the coast (3-9 km) and a terrain following sigma coordinate in the vertical. The model is able to simulate Lakshadweep High and Lakshadweep Low (LL) during the winter and summer monsoons, respectively. During winter, the downwelling processes noticed along the coast help in the formation of temperature inversions. The inversions can be seen even up to the depths of Ì50 m, which agrees with the available ARGO data in the region. Model simulations show that coastal upwelling off Kerala is at its peak in July. The intensity of upwelling reduces along the coast towards north. During the existence of LL, there is a cyclonic eddy in the sub-surface waters over the South-Eastern Arabian Sea, with vertical extent up to the depths of 100-150 m and it is strengthened due to the presence of northward counter current in the shelf region. The southerly coastal jet formed along the southern coast as a result of upwelling is noticed a westward shift along with LL. The location of the eddy off Kerala is tilted towards the open ocean with depth and our experiments suggest that this flow can be understood as a first baroclinic mode.

Item Type: Article
Additional Information: Copyright of this article belongs to Springer-Verlag.
Uncontrolled Keywords: Temperature inversion;Coastal upwelling; Arabian Sea;Kelvin wave;ARGO;River discharge
Subjects: Oceanography > oceanography
Depositing User: INCOIS Library
Date Deposited: 20 Nov 2013 10:54
Last Modified: 20 Nov 2013 10:54

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