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SST-Induced Surface Wind Variations over the Brazil-Malvinas Confluence : Satellite and In Situ Observations

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Title: SST-Induced Surface Wind Variations over the Brazil-Malvinas Confluence : Satellite and In Situ Observations
Authors: Tokinaga, Hiroki Browse this author
Tanimoto, Youichi2 Browse this author →KAKEN DB
Xie, Shang-Ping Browse this author
Authors(alt): 谷本, 陽一2
Issue Date: Sep-2005
Publisher: American Meteorological Society
Journal Title: Journal of climate
Volume: 18
Issue: 17
Start Page: 3470
End Page: 3482
Publisher DOI: 10.1175/JCLI3485.1
Abstract: The confluence of the Brazil–Malvinas Currents maintains strong sea surface temperature (SST) fronts in the midlatitude southwestern Atlantic year-round. SST effects on near-surface stability and surface wind variations are examined in this region using satellite and in situ datasets. Satellite observations show strong (weak) surface wind speeds over the warm Brazil (cold Malvinas) Current. A novel feature of this study is the construction of a high-resolution surface meteorological dataset that is based on historical ship observations. Analysis of this new in situ dataset reveals an increased (reduced) sea–air temperature difference over the Brazil (Malvinas) Current, indicating destabilization (stabilization) in the atmospheric boundary layer. These results are consistent with the SST-induced vertical mixing mechanism for wind adjustment. The SST effect on the near-surface atmosphere is observed both in the climatology and on interannual time scales in the Brazil–Malvinas confluence. Along a zonal SST front at 49°S northeast of the Malvinas/Falkland Islands, there is a collocated line of surface wind divergence, with moderate convergence to the north. Vertical mixing does not explain this divergence pattern because the prevailing surface winds are westerly, blowing in parallel with the front. An additional mechanism is proposed for boundary layer wind adjustment.
Rights: Copyright (c) 2005 American Meteorological Society
Type: article
URI: http://hdl.handle.net/2115/14461
Appears in Collections:環境科学院・地球環境科学研究院 (Graduate School of Environmental Science / Faculty of Environmental Earth Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 谷本 陽一

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