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In this study, the characteristic features in both global change of the K？pen climate regions and desertification during the 20th century were investigated using observed data. The results of the analyses for the areal changes of K？pen climate regions show that the warmer climate areas and the colde...

In this study, the characteristic features in both global change of the K？pen climate regions and desertification during the 20th century were investigated using observed data. The results of the analyses for the areal changes of K？pen climate regions show that the warmer climate areas and the colder climate areas were continually expanded and shrunk, respectively, over the entire period. Areas of C and D climate types show distinct increase and decrease, respectively, since 1960s. These changes seem to be understood by the direct consequences of global warming. Area of the dry climate was considerably expanded since 1970s so that its areal percentage during 1990s was increased by about 2% compared to during 1960s. Especially, area of the desert climates was increased by about 1,320×103km2 during the last decade, relative to the average for 1961~1990. This expansion can be interpreted as a desertification because most of the expansion (more than 98%) was from BS climate regions around deserts. Analysis for the regional desertification reveals that the most prominent expansion occurred in the northern Africa and in the central Asia since 1950s. The possibility of global warming as a cause of the desertification was prudently examined by inquiring intensification of the wintertime Hadley circulation. We found that Hadley circulation in boreal winter was significantly strengthened since 1960s.

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