TY - JOUR
T1 - Effects of Irrigation on Seasonal and Annual Temperature and Precipitation over China Simulated by the WRF Model
AU - Liu, Jian
AU - Jin, Jiming
AU - Niu, Guo Yue
N1 - Funding Information:
This work was supported by the National Key R&D Program of China on monitoring, early warning, and prevention of major natural disasters (grant number 2018YFC150703) and was also supported by the National Natural Science Foundation of China (grant numbers 91637209, 41571030, and 91737306). The authors thank the High‐Performance Computing Center (HPC) of Northwest A&F University (NWAFU) for providing computing resources.
Funding Information:
This work was supported by the National Key R&D Program of China on monitoring, early warning, and prevention of major natural disasters (grant number 2018YFC150703) and was also supported by the National Natural Science Foundation of China (grant numbers 91637209, 41571030, and 91737306). The authors thank the High-Performance Computing Center (HPC) of Northwest A&F University (NWAFU) for providing computing resources.
Publisher Copyright:
© 2021 American Geophysical Union. All Rights Reserved.
PY - 2021/5/8
Y1 - 2021/5/8
N2 - In this study, we developed a realistic irrigation scheme in version 3.6 of the Weather Research and Forecasting model (WRF3.6) with version 4 of the Community Land Model (CLM4) land surface scheme to investigate the effects of cropland irrigation on regional climate in China. Irrigation may occur throughout the year in most croplands with good thermal conditions to cultivate crops for more grain production, known as multiple cropping (MC). However, MC has been considered less in previous studies investigating the climatic effects of irrigation. In addition, the effects of cropland irrigation on seasonal climate in China have been less studied. The climatic effects of irrigation are assessed by comparing observations and model simulations with and without irrigation from 2001 through 2010. Results showed that the simulation with irrigation reduced mainly biases of land surface temperature (LST), surface air temperature (SAT), and precipitation over the irrigated areas. The simulation with irrigation also reproduced reliable annual irrigation water use and reasonable spatial distribution patterns of seasonal irrigation amounts. Both annual LST and SAT decreased 0.6 °C averaged over irrigated areas due to the irrigation-induced cooling effect. Additionally, the decreased surface temperature in the spring led to a reduced land-sea heat contrast that suppressed summer precipitation. The results indicated that a realistic irrigation scheme is important for accessing the climatic effects of irrigation. More broadly, including MC in the irrigation scheme may be useful for other assessments of the climatic effects of irrigation.
AB - In this study, we developed a realistic irrigation scheme in version 3.6 of the Weather Research and Forecasting model (WRF3.6) with version 4 of the Community Land Model (CLM4) land surface scheme to investigate the effects of cropland irrigation on regional climate in China. Irrigation may occur throughout the year in most croplands with good thermal conditions to cultivate crops for more grain production, known as multiple cropping (MC). However, MC has been considered less in previous studies investigating the climatic effects of irrigation. In addition, the effects of cropland irrigation on seasonal climate in China have been less studied. The climatic effects of irrigation are assessed by comparing observations and model simulations with and without irrigation from 2001 through 2010. Results showed that the simulation with irrigation reduced mainly biases of land surface temperature (LST), surface air temperature (SAT), and precipitation over the irrigated areas. The simulation with irrigation also reproduced reliable annual irrigation water use and reasonable spatial distribution patterns of seasonal irrigation amounts. Both annual LST and SAT decreased 0.6 °C averaged over irrigated areas due to the irrigation-induced cooling effect. Additionally, the decreased surface temperature in the spring led to a reduced land-sea heat contrast that suppressed summer precipitation. The results indicated that a realistic irrigation scheme is important for accessing the climatic effects of irrigation. More broadly, including MC in the irrigation scheme may be useful for other assessments of the climatic effects of irrigation.
KW - irrigation
KW - multiple cropping
KW - precipitation
KW - regional climate modeling
KW - temperature
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U2 - 10.1029/2020JD034222
DO - 10.1029/2020JD034222
M3 - Article
AN - SCOPUS:85106871881
SN - 2169-897X
VL - 126
JO - Journal of Geophysical Research Atmospheres
JF - Journal of Geophysical Research Atmospheres
IS - 10
M1 - e2020JD034222
ER -