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dc.contributor.authorFischer, Albert S.  Concept link
dc.coverage.spatialArabian Sea
dc.date.accessioned2012-12-28T16:02:33Z
dc.date.available2012-12-28T16:02:33Z
dc.date.issued1997-09
dc.identifier.urihttps://hdl.handle.net/1912/5666
dc.descriptionSubmitted in partial fulfillment of the requirements for the degree of Master of Science at the Massachusetts Institute of Technology and the Woods Hole Oceanographic Institution September 1997en_US
dc.description.abstractThe unusual twice-yearly cycle of mixed layer deepening and cooling driven by the monsoon is analyzed using a recently collected (1994-95) dataset of concurrent local air-sea fluxes and upper ocean dynamics from the Arabian Sea. The winter northeast monsoon has moderate wind forcing and a strongly destabilizing surface buoyancy flux, driven by large radiative and latent heat losses at the sea surface. Convective entrainment is the primary local mechanism driving the observed mixed layer cooling and deepening, although horizontal advection of thermocline depth variations affect the depth which the mixed layer attains. Modifications of a one-dimensional mixed layer model and heat balance show that the primary nonlocal forcing of the upper ocean is the horizontal advection of temperature gradients below the mixed layer base. The summer southwest monsoon has strong wind stresses and a neutral to stabilizing surface buoyancy flux, limited by the extreme humidity of the atmosphere, which suppresses both the radiative and latent heat losses at the surface. Wind-driven shear instabilities at the base of the mixed layer, which entrain cooler and fresher water primarily produces the observed mixed layer cooling and deepening. Horizontal advection of cooler water within the mixed layer influences the local heat balance at the mooring site. Ekman pumping velocities play only a small role in the upper ocean evolution during both monsoon seasons.en_US
dc.description.sponsorshipThis research was funded by ONR grant N00014-94- 1-0161, and I was supported during this time by a generous NDSEG fellowship.en_US
dc.format.mimetypeapplication/pdf
dc.language.isoen_USen_US
dc.publisherMassachusetts Institute of Technology and Woods Hole Oceanographic Institutionen_US
dc.relation.ispartofseriesWHOI Thesesen_US
dc.subjectOcean-atmosphere interactionen_US
dc.subjectMonsoonsen_US
dc.titleArabian Sea mixed layer deepening during the monsoon : observations and dynamicsen_US
dc.typeThesisen_US
dc.identifier.doi10.1575/1912/5666


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