The Tropical Tropopause Layer 1960–2100

• DOI: 10.5194/acpd-8-1367-2008
• Publication Date: 2010-04-29T12:30:31Z
• Authors: A. Gettelman; T. Birner; V. Eyring; H. Akiyoshi; D. A. Plummer; M. Dameris; S. Bekki; F. Lefèvre; F. Lott; C. Brühl; K. Shibata; E. Rozanov; E. Mancini; G. Pitari; H. Struthers; W. Tian; D. E. Kinnison
• Keywords: Tropopause; Outflow; Quasi-biennial oscillation

Abstract. The representation of the Tropical Tropopause Layer in 13 different Chemistry Climate Models designed to represent stratosphere is analyzed. Simulations for 1960–present and 1980–2100 are analyzed compared reanalysis model output. Results indicate that models able reproduce basic structure TTL. There a large spread cold point tropopause temperatures may be linked variation TTL ozone values. generally historical trends pressure obtained from products. Simulated meridional extent not consistent across models. both tropical level main convective outflow appear decreasing (increasing altitude) runs. Similar seen future. consistently predict pressure, by several hPa/decade. increase 0.2 K/decade. This indicates tropospheric warming dominates stratospheric cooling at tropopause. Stratospheric water vapor 100 hPa increases up 0.5–1 ppmv 2100. less than implied directly temperature methane increases, highlighting correlation with vapor, but also complex nature transport.