EGU2020-4467
https://doi.org/10.5194/egusphere-egu2020-4467
EGU General Assembly 2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Indian irrigation effects on precipitation over the Tibetan Plateau

Yaqiong Lu and Shan Lin
Yaqiong Lu and Shan Lin
  • Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, China (yaqiong@imde.ac.cn)

Indian agriculture equipped the most intensive irrigation worldwide and still maintains an increasing trend of irrigation due to the decreasing of Indian summer monsoon rainfall. Irrigation could largely increase soil moisture and evapotranspiration while cooling air temperature. Several researches showed that Indian irrigation did not significantly contribute to local precipitation, so will the Indian irrigation affect the adjacent regions, such as the Tibetan Plateau is unclear. Here, we set up 10-years simulations for two nested domains (30-10km) over the South-East Asia to quantify the irrigation effects with a coupled dynamic crop model and regional climate model (WRF4.0-CLM4Crop). Besides the numeric simulations, we adopted a water vapor back trajectory tracking method to track where the evaporation from the irrigated land fall as precipitation. Our preliminary results showed that Indian irrigation did not significantly affects temperature, sensible heat flux, and latent heat flux over the Tibetan Plateau, but the water vapor from Indian irrigation contributed to 10% of the summer precipitation on the Tibetan Plateau.

How to cite: Lu, Y. and Lin, S.: Indian irrigation effects on precipitation over the Tibetan Plateau, EGU General Assembly 2020, Online, 4–8 May 2020, EGU2020-4467, https://doi.org/10.5194/egusphere-egu2020-4467, 2020