LYCOS RETRIEVER 
Arabian Sea: Western Arabian Sea
built 617 days ago
The Arabian Sea region is an area of dramatic current and past tectonic and climatic activity. It may be considered the world type area for studying tectonic-climatic interactions related to orogenic uplift, this case the uplift of the Tibetan Plateau and the onset of the SW Monsoon. The Indus Fan drains the high topography of western Tibet, the Karakoram, and Himalaya, whose development is proposed to have initiated the SW Monsoon. [See related articles in Eos and Geoscientist]. The sedimentary record of the Arabian Sea should reflect both orogenic processes as well as changes in the ocean and atmospheric circulation.
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The winds of the Gulf of Aden and Western Arabian Sea are of a monsoonal nature in that they reverse in direction from summer to winter. They are controlled by the seasonal changes of surface pressure patterns. The pressure patterns are in turn the result of the annual variation of temperature that is much larger over land areas compared with neighboring ocean surfaces, causing high pressure over land during the cold winters and low pressure during the hot summers. Short transition seasons are experienced between the summer southwesterly and the winter northeasterly regimes.
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Plankton biomass distributions in the western Arabian Sea region undergo strong seasonal variations as the surface winds change semiannually. Strong coastal upwelling occurring along the Somali coast in summer brings fresh nutrients to the surface, favoring the generation of phytoplankton blooms. These type of blooms are intense and long-lasting, and therefore have a large impact on zooplankton and fishery production in the region. It has been pointed out in previous studies that the intensity of the blooms is sensitive to the atmospheric winds. In this project, a physical-biological coupled system is used to examine how different wind products influence biomass distribution in the western Arabian Sea area. The physical model is the three-dimensional Miami Isopycnic Coordinate Ocean Model (MICOM).
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Over the Western Arabian Sea and the rest of the open Sea the major transition takes place in October. The zone of transition progresses southward during October and November, but south of 5N the Northeast Monsoon is not fully established until December.
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Western Arabian Sea