A distinct stronger warming in the tropical tropopause layer during 2001-2010 using GPS radio occultation : association with minor volcanic eruptions

Material type: 文書・図像類

Author: MEHTA, Sanjay Kumarほか

Publisher: Chiba University. Center for Environmental Remote Sensing

Publication date: 2013-08-08

Material Format: Digital

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Note (General)：: type:text[ABSTRACT]The trends and various interannual variability components in the tropical tropopause layer (TTL) over the tropics (15°S-15°N) were ...

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Material Type: 文書・図像類
Title: A distinct stronger warming in the tropical tropopause layer during 2001-2010 using GPS radio occultation : association with minor volcanic eruptions
Author/Editor: MEHTA, Sanjay Kumar
FUJIWARA, Masatomo
TSUDA, Toshitaka
VERNIER, Jean-Paul
Author Heading: MEHTA, Sanjay Kumar
FUJIWARA, Masatomo
TSUDA, Toshitaka
VERNIER, Jean-Paul
Publication, Distribution, etc.: Chiba University. Center for Environmental Remote Sensing
Publication Date: 2013-08-08
Publication Date (W3CDTF): 2013-08-08
Periodical title: Proceedings of the CEReS international symposium = CEReS国際シンポジウム資料集
No. or year of volume/issue: 20
Volume: 20
Pages: 21-22
Text Language Code: eng
Target Audience: 一般
Note (General): type:text
[ABSTRACT]The trends and various interannual variability components in the tropical tropopause layer (TTL) over the tropics (15°S-15°N) were examined by employing upper air data from GPS radio occultation (RO), radiosondes (IGRA, RICH, and HadAT2), and ERA-Interim during the period 2001-2010. The detection capability of the GPS RO, though with limited data coverage, has been shown in previous studies. A detailed analysis of the warming observed in the TTL from 2001 to 2010 using both standard linear and multiple regressions is carried out. The temperature trends estimated using standard linear regression analysis (with only constant and linear trend terms) reveals a strong warming of about 0.5-1.5 K/decade in the TTL in each dataset during 2001-2010. This strong warming in the TTL is not explained by the global warming. The contribution from various interannual variability components such as quasi-biennial oscillation (QBO), El Ni?o southern oscillation (ENSO), and stratospheric aerosol optical depth (AOD) is separated using multiple regression analysis techniques. We performed two types of multiple regression analysis that do not consider and that consider seasonal modulation of the interannual components. The distinct warming in the TTL is found to be partly associated with the minor volcanic eruptions during the first decade of the 21st century. Positive and significant AOD responses to the temperatures of about 0.1-0.2 K are observed in the TTL region, explaining about 5% to 15% of the total variance during 2001-2010.
Access Restrictions: 限定公開
Data Provider (Database): 国立情報学研究所 : 学術機関リポジトリデータベース（IRDB）（機関リポジトリ）
https://irdb.nii.ac.jp
Original Data Provider (Database): 千葉大学 : 千葉大学学術成果リポジトリ