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Direct Observations of Atmospheric Boundary Layer Response to SST Variations Associated with Tropical Instability Waves over the Eastern Equatorial Pacific

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Title: Direct Observations of Atmospheric Boundary Layer Response to SST Variations Associated with Tropical Instability Waves over the Eastern Equatorial Pacific
Authors: Hashizume, Hiroshi Browse this author
Xie, Shang-Ping Browse this author
Fujiwara, Masatomo Browse this author →KAKEN DB
Shiotani, Masato Browse this author
Watanabe, Tomowo Browse this author
Tanimoto, Youichi Browse this author
Liu, W. Timothy Browse this author
Takeuchi, Kensuke Browse this author
Issue Date: Dec-2002
Publisher: American Meteorological Society
Journal Title: Journal of Climate
Volume: 15
Issue: 23
Start Page: 3379
End Page: 3393
Publisher DOI: 10.1175/1520-0442(2002)015<3379:DOOABL>2.0.CO;2
Abstract: Tropical instability waves (TIWs), with a typical wavelength of 1000 km and period of 30 days, cause the equatorial front to meander and result in SST variations on the order of 18–28C. Vertical soundings of temperature, humidity, and wind velocity were obtained on board a Japanese research vessel, which sailed through three fully developed SST waves from 1408 to 1108W along 28N during 21–28 September 1999. A strong temperature inversion is observed throughout the cruise along 28N, capping the planetary boundary layer (PBL) that is 1– 1.5 km deep. Temperature response to TIW-induced SST changes penetrates the whole depth of the PBL. In response to an SST increase, air temperature rises in the lowest kilometer and shows a strong cooling at the mean inversion height. As a result, this temperature dipole is associated with little TIW signal in the observed sea level pressure (SLP). The cruise mean vertical profiles show a speed maximum at 400–500 m for both zonal and meridional velocities. SST-based composite profiles of zonal wind velocity show weakened (intensified) vertical shear within the PBL that is consistent with enhanced (reduced) vertical mixing, causing surface wind to accelerate (decelerate) over warm (cold) SSTs. Taken together, the temperature and wind soundings indicate the dominance of the vertical mixing over the SLP-driving mechanism. Based on the authors’ measurements, a physical interpretation of the widely used PBL model proposed by Lindzen and Nigam is presented.
Rights: © Copyright 2002 American Meteorological Society (AMS). Permission to use figures, tables, and brief excerpts from this work in scientific and educational works is hereby granted provided that the source is acknowledged. Any use of material in this work that is determined to be “fair use” under Section 107 of the U.S. Copyright Act September 2010 Page 2 or that satisfies the conditions specified in Section 108 of the U.S. Copyright Act (17 USC §108, as revised by P.L. 94-553) does not require the AMS’s permission. Republication, systematic reproduction, posting in electronic form, such as on a web site or in a searchable database, or other uses of this material, except as exempted by the above statement, requires written permission or a license from the AMS. Additional details are provided in the AMS Copyright Policy, available on the AMS Web site located at (https://www.ametsoc.org/) or from the AMS at 617-227-2425 or copyrights@ametsoc.org.
Type: article
URI: http://hdl.handle.net/2115/64852
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: 藤原 正智

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