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Role of vertical eddy heat flux in the response of tropical tropopause temperature to changes in tropical sea surface temperature
| Title: | Role of vertical eddy heat flux in the response of tropical tropopause temperature to changes in tropical sea surface temperature |
| Authors: | Yoshida, Kohei Browse this author | | Yamazaki, Koji Browse this author →KAKEN DB |
| Issue Date: | 13-Jan-2010 |
| Publisher: | American Geophysical Union |
| Journal Title: | Journal of Geophysical Research, Atmospheres |
| Volume: | 115 |
| Start Page: | D01108 |
| Publisher DOI: | 10.1029/2009JD012783 |
| Abstract: | We performed numerical experiments using an atmospheric general circulation model to assess the effect of convections associated with various tropical sea surface temperature (SST) fields on the tropical tropopause (TT). Three experiments were designed with different patterns of tropical SST: increasing and decreasing mean tropical SST, enhanced and weakened longitudinal gradient of tropical SST, and observed SST corresponding to strong El Niño-Southern Oscillation (ENSO) events. The results reveal that vertical advection plays an important role in controlling seasonal variation in TT temperature. In the case of a large (small) longitudinal gradient of tropical SST, the vertical eddy heat flux (￣ω'θ') diverges strongly (weakly) around the TT, resulting in cooling (warming) of the TT. Divergence of the vertical eddy heat flux is a primary controlling factor of variations in interannual TT temperature, especially during the peak of El Niño events. Analysis of ERA-Interim and ERA-40 data supports our results regarding the influence of vertical eddy heat flux on TT temperature. Divergence of vertical eddy heat flux at the TT layer is sensitive to the "strength" of the Matsuno-Gill-type tropical stationary wave response; this divergence appears to explain variations in the observed TT temperature associated with ENSO. |
| Rights: | Copyright 2010 by the American Geophysical Union |
| Type: | article |
| URI: | http://hdl.handle.net/2115/49419 |
| 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)
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Submitter: 山崎 孝治
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