Indian Ocean experiments with a coupled model

Wainer, I. (1997) Indian Ocean experiments with a coupled model. Il nuovo cimento C, 20 C (2). pp. 165-180. ISSN 1826-9885


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A coupled ocean-atmosphere model is used to investigate the equatorial Indian Ocean response to the seasonally varying monsoon winds. Special attention is given to the oceanic response to the spatial distribution and changes in direction of the zonal winds. The atmosphere is modeled using a simple shallow-water system that is coupled to a nonlinear zonally symmetric model, which provides a zonally averaged annual cycle. The Indian Ocean is surrounded by an «Asian» land mass to the North and an «African» land mass to the West. The model extends latitudinally between 41 N and 41 S. The asymmetric atmospheric model is driven by a mass sourceOsink term that is proportional to the sea surface temperature (SST) over the oceans and the heat balance over the land. The ocean is modeled using the Anderson and McCreary reduced-gravity transport model that includes a prognostic equation for the SST. The coupled system is driven by the annual cycle as manifested by zonally symmetric and asymmetric land and ocean heating. The ocean is driven by atmospheric wind stress forcing and a parametrized heat flux. We explored the different nature of the equatorial ocean response to various patterns of zonal wind stress forcing in order to isolate the impact of the remote response on the Somali current. The major conclusions are: i) the equatorial response is fundamentally different for easterlies and westerlies, ii) the impact of the remote forcing on the Somali current is a function of the annual cycle, iii) the size of the basin sets the phase of the interference of the remote forcing on the Somali current relative to the local forcing.

Item Type: Article
Uncontrolled Keywords: Physics of the oceans
Subjects: 500 Scienze naturali e Matematica > 530 Fisica
500 Scienze naturali e Matematica > 550 Scienze della Terra > 551 Geologia, Idrologia, Meteorologia
Depositing User: Marina Spanti
Date Deposited: 09 May 2017 11:17
Last Modified: 09 May 2017 11:17

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