オダ　リョウコ   Ryoko Oda   小田　僚子    所属   千葉工業大学  創造工学部 都市環境工学科    千葉工業大学  創造工学研究科 都市環境工学専攻    千葉工業大学  工学研究科 工学専攻    職種   教授
言語種別	英語
発行・発表の年月	2018/04
形態種別	学術雑誌
標題	Urban Thermal Influence on the Background Environment of Convective Precipitation
執筆形態	共著
掲載誌名	Journal of the Meteorological Society of Japan
掲載区分	国外
出版社・発行元	The Meteorological Society of Japan c/o Japan Meteorological Agency
巻・号・頁	96A,pp.67-76
著者・共著者	Hirofumi Sugawara, Ryoko Oda, Naoko Seino
概要	Does the presence of cities enhance precipitation? It is an issue that needs to be addressed. This study focuses on the thermal excess in cities and attempts to determine the influence of this parameter on atmospheric instability, which constitutes the background condition for convective precipitation. A simple analytical approach involving the calculation of the daytime evolution of the mixed layer over a homogeneous ground surface was developed. The calculations were based on the data from the ensemble average of observations. Using these calculations, the convective available potential energy (CAPE) was obtained for two idealized geographic areas: one with urban land cover and the other with rural land cover. Urban heat excess, which was 200 W m−2 greater than rural area, increased CAPE value by 75 % comparing to the rural CAPE value of 513 J kg−1. Cities can produce stratification in the atmosphere that is favorable for convective precipitation.
DOI	10.2151/jmsj.2018-010