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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

Boundary-Layer Meteorology, ISSN: 1573-1472, Vol: 179, Issue: 3, Page: 447-476
2021
  • 2
    Citations
  • 0
    Usage
  • 17
    Captures
  • 1
    Mentions
  • 0
    Social Media
Metric Options:   Counts1 Year3 Year

Metrics Details

  • Citations
    2
    • Citation Indexes
      2
  • Captures
    17
  • Mentions
    1
    • Blog Mentions
      1
      • Blog
        1

Article Description

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 CO 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 × 300 km region in Japan. Downscaling meteorological variables from grid-mean values of mixed land use (3 × 3 km) 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 CO concentration increases the daily maximum grid-mean air temperature, particularly where rice paddies are present, by up to 0.7 °C. This CO 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 CO change. However, within the internal atmospheric boundary layer of the rice paddies, the CO effect on the air temperature (+ 0.44 °C) still exceeds the effects of the land-use change (+ 0.11 °C). These results show a potentially important interplay of plant physiological responses regarding atmospheric CO in the heat-mitigation effect of rice-paddy fields under a changing climate.

Bibliographic Details

Hiroki Ikawa; Tsuneo Kuwagata; Shigenori Haginoya; Yasushi Ishigooka; Keisuke Ono; Atsushi Maruyama; Hidemitsu Sakai; Minehiko Fukuoka; Mayumi Yoshimoto; Tsutomu Watanabe; Sachinobu Ishida; Charles P. Chen; Toshihiro Hasegawa

Springer Science and Business Media LLC

Earth and Planetary Sciences

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