On the dynamics of the Zanzibar Channel

dc.contributor.author Zavala-Garay, Javier
dc.contributor.author Theiss, Jurgen
dc.contributor.author Moulton, Melissa
dc.contributor.author Walsh, Connor
dc.contributor.author van Woesik, Robert
dc.contributor.author Mayorga-Adame, Claudia G.
dc.contributor.author García-Reyes, Marisol
dc.contributor.author Mukaka, D. S.
dc.contributor.author Whilden, Kerri
dc.contributor.author Shaghude, Y. W.
dc.date.accessioned 2015-11-23T19:57:52Z
dc.date.available 2016-03-12T08:37:03Z
dc.date.issued 2015-09-12
dc.description Author Posting. © American Geophysical Union, 2015. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Journal of Geophysical Research: Oceans 120 (2015): 6091–6113, doi:10.1002/2015JC010879. en_US
dc.description.abstract The Zanzibar Channel lies between the mainland of Tanzania and Zanzibar Island in the tropical western Indian Ocean, is about 100 km long, 40 km wide, and 40 m deep, and is essential to local socioeconomic activities. This paper presents a model of the seasonal and tidal dynamics of the Zanzibar Channel based on the Regional Ocean Modeling System (ROMS) and a comparison of the model and observations. The seasonal dynamics of the channel is forced by remote processes and the local wind. Remote forcing creates the East African Coastal Current, a portion of which flows through the channel northward with a seasonally varying magnitude. The local wind enhances this seasonality in the surface Ekman layer, resulting in a stronger northward flow during the southwest monsoon season and a weak northward or occasionally southward flow during the northeast monsoon season. The tidal flows converge and diverge in the center of the channel and reduce the transport in the channel. The remotely forced, wind-forced, and tidal dynamics contain 5%, 3%, and 92% of the total kinetic energy, respectively. Despite their low kinetic energy, the remotely forced and wind-forced flows are most relevant in advecting channel water to the open ocean, which occurs in 19 days at the peak of the southwest monsoon season. The channel is well mixed, except during brief periods in the two rainy seasons, and temporarily cools between December and February. The dispersion of passive tracers is presented as an example of potential model applications. en_US
dc.description.embargo 2016-03-12 en_US
dc.description.sponsorship National Science Foundation Grant Numbers: OISE-0827059 , OCE-0550658 , OCE-0851493 , OCE-0927472 en_US
dc.format.mimetype application/pdf
dc.identifier.citation Journal of Geophysical Research: Oceans 120 (2015): 6091–6113 en_US
dc.identifier.doi 10.1002/2015JC010879
dc.identifier.uri https://hdl.handle.net/1912/7643
dc.language.iso en_US en_US
dc.publisher John Wiley & Sons en_US
dc.relation.uri https://doi.org/10.1002/2015JC010879
dc.subject Zanzibar Channel en_US
dc.subject Ocean Modeling en_US
dc.subject East Africa Coastal Current en_US
dc.subject Monsoon en_US
dc.subject Channel dynamics en_US
dc.title On the dynamics of the Zanzibar Channel en_US
dc.type Article en_US
dspace.entity.type Publication
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