日本地球惑星科学連合2019年大会

講演情報

[E] ポスター発表

セッション記号 A (大気水圏科学) » A-CG 大気海洋・環境科学複合領域・一般

[A-CG34] 衛星による地球環境観測

2019年5月30日(木) 13:45 〜 15:15 ポスター会場 (幕張メッセ国際展示場 8ホール)

コンビーナ:沖 理子(宇宙航空研究開発機構)、本多 嘉明(千葉大学環境リモートセンシング研究センター)、高薮 縁(東京大学 大気海洋研究所)、松永 恒雄(国立環境研究所地球環境研究センター/衛星観測センター)

[ACG34-P17] A Relationship between Diurnal Change Patterns of Land Surface Temperature and Spatial Configuration of the Osaka Metropolitan Area Captured by Himawari-8

*山本 雄平1石川 裕彦1 (1.京都大学防災研究所)

キーワード:地表面温度、ひまわり8号、都市ヒートアイランド

Land surface temperature (LST) is a physical quantity that greatly contributes to the formation of an urban thermal environment. Therefore, understanding the spatiotemporal characteristics of LST is necessary for constructing a sustainable urban environment. The spatial distribution relationship between the instantaneous LST and urban land use has been investigated using polar-orbiting satellite/airborne sensors. This study explored how the urban spatial configuration and meteorological field affect the temporal changes of LST by using Japanese geostationary satellite (Himawari-8) sensor.
The study area is the Osaka metropolitan area in Japan and target days are three days that were clear-sky throughout the day in summer (August 12, 2016, July 19, 2018, and August 4, 2018). We used 100 m-mesh urban land use data and ground-based meteorological observation data to examine the urban spatial configuration and meteorological fields, respectively. The temporal changes of LST are the amplitude and phase mainly forming the diurnal change of LST. These two temporal changes were extracted by applying principal component analysis to the diurnal changes of LST represented by the 10-minute LST dataset retrieved from Himawari-8 data.
Our results showed that the spatial variations in the amplitude and phase corresponded to the penetration time and duration of the sea breeze and the thermal inertia of surface materials. Besides, it was found that the LST change during daytime was larger in the high-density low-building areas than in the low-density low-building areas. This result suggests that the increase in building density increases the LST change during the daytime. These findings lead to a deeper understanding of an urban hot environment and are helpful for urban planning to mitigate the deterioration of a hot environment.