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Heat-Mitigation Effects of Irrigated Rice-Paddy Fields Under Changing Atmospheric Carbon Dioxide Based on a Coupled Atmosphere and Crop Energy-Balance Model

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Title: Heat-Mitigation Effects of Irrigated Rice-Paddy Fields Under Changing Atmospheric Carbon Dioxide Based on a Coupled Atmosphere and Crop Energy-Balance Model
Authors: Ikawa, Hiroki Browse this author
Kuwagata, Tsuneo Browse this author
Haginoya, Shigenori Browse this author
Ishigooka, Yasushi Browse this author
Ono, Keisuke Browse this author
Maruyama, Atsushi Browse this author
Sakai, Hidemitsu Browse this author
Fukuoka, Minehiko Browse this author
Yoshimoto, Mayumi Browse this author
Ishida, Sachinobu Browse this author
Chen, Charles P. Browse this author
Hasegawa, Toshihiro Browse this author
Watanabe, Tsutomu Browse this author
Keywords: Crop energy-balance model
Heat-mitigation effect
Regional atmospheric model
Rice-paddy field
Issue Date: 5-Mar-2021
Publisher: Springer
Journal Title: Boundary-layer meteorology
Volume: s10546-021-00604-6
Start Page: s10546-021-00604-6
Publisher DOI: 10.1007/s10546-021-00604-6
Abstract: Known as the heat-mitigation effect, irrigated rice-paddy fields distribute a large fraction of their received energy to the latent heat during the growing season. The present hypothesis is that increased atmospheric CO2 concentration decreases the stomatal conductance of rice plants and increases the air temperature by means of an increased sensible heat flux. To test this hypothesis, a coupled regional atmospheric and crop energy-balance model is developed and applied to a 300 x 300 km(2) region in Japan. Downscaling meteorological variables from grid-mean values of mixed land use (3 x 3 km(2)) generates realistic typical diurnal cycles of air temperature in rice paddies and adjacent residential areas. The model simulation shows that, on a typical sunny day in summer, doubling the CO2 concentration increases the daily maximum grid-mean air temperature, particularly where rice paddies are present, by up to 0.7 degrees C. This CO2 effect on the grid-mean air temperature is approximately half the effect of the reduction in rice-paddy area that is postulated to occur on a time scale similar to that of the atmospheric CO2 change. However, within the internal atmospheric boundary layer of the rice paddies, the CO2 effect on the air temperature (+ 0.44 degrees C) still exceeds the effects of the land-use change (+ 0.11 degrees C). These results show a potentially important interplay of plant physiological responses regarding atmospheric CO2 in the heat-mitigation effect of rice-paddy fields under a changing climate.
Type: article
Appears in Collections:低温科学研究所 (Institute of Low Temperature Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

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