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 |
URI: | http://hdl.handle.net/2115/81167 |
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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