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Analysis of Intensity Changes of Walker, Monsoon, and Hadley Circulations by the Global Warming in the 21st Century

PI: Hiroshi L. Tanaka
Institution: University of Tsukuba, Japan
Additional Investigators: Yasushi Watarai, and Akio Kitoh
In this study, we attempt to divide global divergent field at the upper troposphere in contributions from the Hadley, Walker, and monsoon circulations, following the method by Tanaka et al. (2004). The data used in this study are monthly mean wind at 200 hPa level. According to our previous study for the MRI CGCM with a gradual increase in CO2 at a compound rate of 1 %/yr for 150 years, it is found that the Hadley circulation intensifies by 40 %, and the monsoon circulation decays by 20% in boreal summer when the global warming takes places in the 21st century. We propose to conduct the same analysis for various climate model predictions under the IPCC Fourth Assessment Report using the monthly mean velocity potential field at 200 hPa level. The analysis would show how the intensity of Walker, monsoon, and Hadley circulation will change after the global warming.
  • Tanaka, H. L., N. Ishizaki and A. Kitoh, 2004: Trend and interannual variations of Walker, monsoon, and Hadley circulations defined by velocity potential in the upper troposphere. Tellus, 56A, 250-269. Abstract. Full Article. Edit.
  • Tanaka, H.L., N. Ishizaki, and D. Nohara, 2005: ntercomparison of the intensities and trends of Hadley, Walker, and monsoon circulations in the global warming predictions. SOLA, 1, 77-80, doi:10.2151/sola.2005-021. Abstract. Full Article. Edit.

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