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Realities ofAir Temperature Disfribution in Summer in Tokyo-Observation results since 2007 to 2009 YOKOYAMA Hitoshi, ANDO Haruo, OOKUBO Sayuri*, AKASAKA lkumi**, TAKAIIASHI Kazuyuki*Assooiate researcher, i'*JAMSTEC
Surnmary
We examined the realities ofurban heat island phenomena in Tol'To in summer by analyzing data ofthe high density
heat island observation net. As a result, it became clear that the detailed reality ofheat island in Tokyo. Main results
were as follous. Daily maximum air temperature was high in not only Tokyo wards but also the east part ofTama. Onthe oth€r hand, ratio ofPeriods

7-o230t which are said to be closely related to h€at disorder was lowin Tama andhigh in the area fiom c€ntral Tokyo toward the northem and no hw€st area. Numbers of I'1n-25tdays(tropicalnight) was high in the area from central Tokyo toward Tokyo bay; appeared from late mid-night to early morning. By
analyzing relationship b€tween distribution ofair temperature and ratio ofgreen space, there was negative corelation,
especially tropical night and daily minimum air temperature was higher.

Key words: Urban Heat Island, Air Temperature Dstribution, Ratio of Periods Z*2 3011, Ratio of Green SpaceHHSEEfl+tr4ffiS* 2010

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