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New Characteristics of the Tropical Tropopause Revealed by CHAMP/GPS Measurements

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Title: New Characteristics of the Tropical Tropopause Revealed by CHAMP/GPS Measurements
Authors: Ratnam, M. Venkat Browse this author
Tsuda, T. Browse this author
Shiotani, M. Browse this author
Fujiwara, M. Browse this author →KAKEN DB
Issue Date: 23-Mar-2017
Publisher: 日本気象学会
Journal Title: SOLA
Volume: 1
Start Page: 185
End Page: 188
Publisher DOI: 10.2151/sola.2005-048
Abstract: Structure and variability of the tropical tropopause are presented using radio occultation measurements by CHAMP/GPS (CHAllenging Mini satellite Payload/ Global Positioning System) from May 2001 to December 2004 (with a total of 175,149 occultations). The tropopause heights defined by both lapse rate and cold point generally show large-scale, off-equatorial maxima (tropopause increase at 20°N or S than at equator), and sometimes even a high tropopause for about 0.3 to 0.65 km (on an average) at 20°N and S simultaneously than at the equator along a particular meridian, in contrast to our previous knowledge. Although this feature has already been reported partially during the summer monsoon season, the present study shows the seasonal and geographical distributions of the tropical tropopause comprehensively using a new promising observational technique. In addition, the vertical shape of the tropopause is found to be sharp in the equatorial region and broad in the subtropics especially in northern winter. Possible mechanisms are discussed in light of dynamical and radiative processes.
Type: article
URI: http://hdl.handle.net/2115/64830
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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