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Sea Level Pressure Minimum along the Kuroshio and Its Extension

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Title: Sea Level Pressure Minimum along the Kuroshio and Its Extension
Authors: Tanimoto, Youichi Browse this author
Kanenari, Tomohisa Browse this author
Tokinaga, Hiroki Browse this author
Xie, Shang-Ping Browse this author
Issue Date: Aug-2011
Publisher: American Meteorological Society
Journal Title: Journal of Climate
Volume: 24
Issue: 16
Start Page: 4419
End Page: 4434
Publisher DOI: 10.1175/2011JCLI4062.1
Abstract: Atmospheric effects of sea surface temperature (SST) fronts along the Kuroshio and Kuroshio Extension (K-KE) are investigated by examining spatial characteristics of the climatological sea level pressure (SLP), surface winds and surface heat flux (Q) fields based on an in situ observation dataset. A hydrostatic effect of the SST front is observed during the northwesterly monsoon characterized by a westward-extending low-SLP wedge (trough) slightly south of the peak in Q along the K-KE. Ageostrophic surface westerlies crossing SLP isobars toward a trough center are found north of the low-SLP wedge apparently because of the eastward acceleration by the vertical mixing effect. This feature of the ageostrophic winds is less pronounced south of it, a north-south asymmetry arising as vertical mixing accelerates (decelerates) eastward ageostrophic winds north (south) of it. While the SLP trough near the SST front is found nearly year-round except for summer, its meridional location seasonally migrates probably due to the change in the mean surface flow. Regional atmospheric model experiments are conducted to examine the effect of the SST front on the overlying atmosphere. The observed features in winter are adequately simulated when high-resolution SST is prescribed as the boundary condition. The strong Q along the K-KE and resultant SLP trough and ageostrophic surface winds are absent when the SST boundary condition is smoothed in space to weaken the SST front. These results illustrate that the cross-frontal change in Q is of great importance to leave the SST imprint on the overlying atmosphere via hydrostatic and vertical mixing adjustments.
Rights: © 2011 American Meteorological Society
Type: article
URI: http://hdl.handle.net/2115/48175
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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