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Diagnostics for Near-Surface Wind Response to the Gulf Stream in a Regional Atmospheric Model
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Title: Diagnostics for Near-Surface Wind Response to the Gulf Stream in a Regional Atmospheric Model
Authors: Takatama, Kohei Browse this author
Minobe, Shoshiro Browse this author →KAKEN DB
Inatsu, Masaru Browse this author →KAKEN DB
Small, R. Justin Browse this author
Issue Date: Jan-2015
Publisher: American Meteorological Society
Journal Title: Journal of Climate
Publisher DOI: 10.1175/JCLI-D-13-00668.1
Abstract: The mechanisms acting on near-surface winds over the Gulf Stream are diagnosed using 5-yr outputs of a regional atmospheric model. The diagnostics for the surface-layer momentum vector, its curl, and its convergence are developed with a clear separation of pressure adjustment from downward momentum inputs from aloft in the surface-layer system. The results suggest that the downward momentum mixing mechanism plays a dominant role in contributing to the annual-mean climatological momentum curl, whereas the pressure adjustment mechanism plays a minor role. In contrast, the wind convergence is mainly due to the pressure adjustment mechanism. This can be explained by the orientation of background wind to the sea surface temperature front. The diagnostics also explain the relatively strong seasonal variation in surface-layer momentum convergence and the small seasonal variation in curl. Finally, the surface-layer response to other western boundary currents is examined using a reanalysis dataset.
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Appears in Collections: 理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
Submitter: 見延 庄士郎