Urban heat island in OSAKA CITY - distribution of 'NETTAIYA'and 'MOUSHOBI' degree hoursand characteristics of air temperature

摘要

In Osaka City, the number of heat stroke patients has been found to be strongly related to theincreasing air temperatures in urban areas. In 2005, the Osaka City Govemment formulated theHeat Island Measures Promotion Plan. The target of this plan was stated as follows: "The in-creasing annual mean temperature and the increasing number of 'Nettaiya' nights must be con-trolled by FY2020." It was found that the heat could be evaluated quantitatively using "degreehour (DH)" according to the class of temperature as an index. In this evaluation, it is necessaryto consider regional characteristics because measures corresponding to the regional differencesin energy consumption and sea breeze are necessary.