1989 Fiscal Year Final Research Report Summary

Research on the change in urban climate follows development of urbanization.

Research Project

Project/Area Number	61420049
Research Category	Grant-in-Aid for General Scientific Research (A)
Allocation Type	Single-year Grants
Research Field	自然地理学
Research Institution	University of Tsukuba
Principal Investigator	NISHIZAWA Toshie Univ.of Tsukuba Inst.of Geoscience Professor, 地球科学系, 教授 (90062512)
Co-Investigator(Kenkyū-buntansha)	YOSHINO M. Univ.of Tsukuba Inst. of Geosci. Prof., 地球科学系, 教授 (60015956) TAKAHASHI N. Univ.of Tsukuba Inst. of Geosci.Aso.Prof., 地球科学系, 助教授 (50015773) KOBAYASHI M. Univ.of Tsukuba Inst. of Geosci.Ass.Prof., 地球科学系, 講師 (10153644) KOTOODA K. Univ.of Tsukuba Inst. of Geosci. Prof., 地球科学系, 教授 (40015540) KAWAMURA T. Univ.of Tsukuba Inst. of Geosci. Prof., 地球科学系, 教授 (20111362)
Project Period (FY)	1986 – 1989
Keywords	urbanization / indicator of urbanization / urban heat island intensity / exposure rate / green house effect / incomfort index
Research Abstract	In the final year of this research project, the research review on urban heat island was made from three points : field observation, theory, and modeling. The necessity of research on heat sink in an urban area was considered. The morphological feature and population in an urban area and in DID were used as an indicator of urbanization. These indicators were observed at 11 cities in the Kanto District. Field observation of urban heat island were also conducted at 11 cities and heat island was observed remarkably in each city. From these results, the unique relationship between maximum urban heat-island and population in both urban area and DID was found. This relationship is different clearly from the result which was found by Fukuoka in Japanese cities. Moreover, the relationship between air temperature and exposure rate at each observation point was obtained 5 cities. This relation occurs remarkably around 21:00 at each city. Landsat imagines on the same day as the field observation at 11 cities were also analyzed. Long term trend of air temperature in an urban area was also analyzed in the relation to the air temperature increase caused by the green house effect. In addition, imcom incomfort index was calculated in Tokyo and its surrounding area. The relationship between maximum heat island intensity ( T_<u-r> max) and population P was obtained, using data at 11 cities as follows: T_<u-r> max = 2.02 log P - 7.69 ( r = 0.979 ) at 21:00 T_<u-r> max = 1.47 log P_<did> - 4.28 (r = 0.986 ) at 21:00.