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An active role of extratropical sea surface temperature anomalies in determining anomalous turbulent heat flux

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Title: An active role of extratropical sea surface temperature anomalies in determining anomalous turbulent heat flux
Authors: Tanimoto, Youichi1 Browse this author →KAKEN DB
Nakamura, Hisashi Browse this author
Kagimoto, Takashi Browse this author
Yamane, Shozo Browse this author
Authors(alt): 谷本, 陽一1
Keywords: sea surface temperature
ocean-to-atmosphere effect
air-sea interaction
decadal variability
subpolar frontal zone
Issue Date: 1-Oct-2003
Publisher: American Geophysical Union
Journal Title: Journal of Geophysical Research
Volume: 108
Issue: c10
Start Page: 3304
Publisher DOI: 10.1029/2002JC001750
Abstract: Temporal and spatial structures of turbulent latent and sensible heat flux anomalies are examined in relation to dominant patterns of sea surface temperature anomalies (SSTA) observed over the North Pacific. Relative importance among observed anomalies in SST, surface air temperature, and wind speed in determining the anomalous turbulent heat fluxes is assessed through linearizing the observed flux anomalies. Over the central basin of the North Pacific, changes in the atmospheric variables, including air temperature and wind speed, are primarily responsible for the generation of local SST variations by changing turbulent heat flux, which supports a conventional view of extratropical air-sea interaction. In the region where ocean dynamics is very important in forming SSTAs, in contrast, SSTAs that have been formed in early winter play the primary role in determining mid- and late-winter turbulent heat flux anomalies, indicative of the SST forcing upon the overlying atmosphere. Specifically, both decadal scale SSTAs in the western Pacific subarctic frontal zone and El Niño related SSTAs south of Japan are found to be engaged actively in such forcing on the atmosphere. The atmospheric response to this forcing appears to include the anomalous storm track activity. The observed atmospheric anomalies, which may be, in part, forced by the preexisting SSTAs in those two regions, act to force SSTAs in other portions of the basin, leading to the time evolution of SSTAs as observed in the course of the winter season.
Rights: An edited version of this paper was published by AGU. Copyright 2003 American Geophysical Union.
Type: article
URI: http://hdl.handle.net/2115/14619
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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