Influence of topography on temperature variations in the tropical tropopause layer

Kubokawa, Hiroyasu; Satoh, Masaki; Suzuki, Junko et al.

Journal of geophysical research atmospheres, 2016, 121(19), 11556-11574

Permalink : https://hdl.handle.net/2115/63930

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アクセス権
open access
URI
https://hdl.handle.net/2115/63930
タイトル
Influence of topography on temperature variations in the tropical tropopause layer
著者
Kubokawa, Hiroyasu ; Satoh, Masaki ; Suzuki, Junko ; Fujiwara, Masatomo
著者名
Kubokawa, Hiroyasu
e-Rad_Researcher
00255142
著者名
Satoh, Masaki
著者名
Suzuki, Junko
e-Rad_Researcher
00360941
著者名
Fujiwara, Masatomo
言語
英語
キーワード
extreme events
topography
gravity waves
tropical tropopause layer
発行日
2016-10
出版者
American Geophysical Union
収録物名
Journal of geophysical research atmospheres
巻(号)
121(19)
ページ
11556-11574
抄録
Temperature variations in the tropical tropopause layer (TTL) play an important role in dehydration in the upper troposphere and lower stratosphere. Equatorial Kelvin waves associated with the Madden-Julian Oscillation (MJO) are known to induce remarkable temperature variations in the TTL. In this study, the influence of topography on temperature variations in the TTL is investigated by using radiosonde data, satellite data, reanalysis data, and numerically simulated data. When MJO convection passes over the radiosonde sites, temperature variations near mountainous regions are larger than those measured in regions of lower elevation. The difference in temperature amplitude reaches similar to 1-2K. Large temperature variations over mountainous regions were also found in other data sets. Numerically simulated data from the Nonhydrostatic Icosahedral Atmospheric Model (NICAM) are also used to investigate the temperature variations in the TTL. The results show that the temperature variations associated with Kelvin waves become large over mountainous regions. A sensitivity test using the stretched version of NICAM gave two important results: (i) the height of mountains affects the magnitude of the temperature variations in the TTL, and (ii) the terrain-following coordinate system used in the model produces the artificially high-temperature variation in the TTL. When Kelvin waves pass over mountainous regions, topographic gravity waves are excited and superimposed on the Kelvin waves, thereby producing large temperature variations over these regions. The mountainous region of the Indonesian Maritime Continent is a favorable location for large temperature variations in the TTL.
資源タイプ
学術雑誌論文
出版タイプ
Version of Record
権利情報
Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
PISSN
2169-897X
関連情報 (isIdenticalTo)
出版社版DOI
https://doi.org/10.1002/2016JD025569