NDLI: Variations of the Tropopause Over Different Latitude Bands Observed Using COSMIC Radio Occultation Bending Angles

Content Provider	IEEE Xplore Digital Library
Author	Xiaohong Zhang Pan Gao Xiaohua Xu
Copyright Year	1980
Abstract	The tropopause is a transition layer between the troposphere and the stratosphere. The exchange of air, water vapor, trace gases, and energy between the troposphere and the stratosphere occurs in this layer. Accurate and continuous observations of the tropopause on a global scale are crucial for monitoring stratosphere-troposphere exchange and understanding the properties of atmosphere in the upper troposphere and lower stratosphere. In this paper, the tropopause heights are identified from Global Positioning System radio occultation (RO) bending angle profiles using the covariance transform method. Temporal variations of the tropopause parameters, including the tropopause height, temperature, and pressure at different latitude bands are investigated using the RO observations from the Constellation Observing System for Meteorology, Ionosphere and Climate mission during the period from January 2007 to December 2011. We divide the Earth into 18 nonoverlapping latitude bands 10 ^° wide. Monthly averages of the tropopause parameters weighted by area are calculated at each latitude band and the temporal variations of these tropopause parameters are analyzed. The results indicate that the latitudinal variation patterns of the tropopause parameters in the Northern Hemisphere are different than those in the Southern Hemisphere. The relationship between the variations of different tropopause parameters is studied. The results show that the variation of the tropopause temperature and pressure is negatively correlated with that of the tropopause height in most of the latitude bands. In addition, the trend of the variation of the tropopause height in each latitude band is calculated with the median of pairwise slopes regression method. We find that the overall trend in the tropopause height varies in different latitude bands. The global average tropopause height decreases ~ 7 m/a during the period from 2007 to 2011.
Sponsorship	IEEE Geoscience and Remote Sensing Society IEEE URSI
Starting Page	2339
Ending Page	2349
Page Count	11
File Size	1269323
File Format	PDF
ISSN	01962892
Volume Number	52
Issue Number	5
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2014-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	tropopause Bending angle Constellation Observing System for Meteorology Ionosphere and Climate (COSMIC) Global Positioning System (GPS) radio occultation
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences Electrical and Electronic Engineering

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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