Implementation and Evaluation of Irrigation Techniques in the Community Land Model

Several previous studies have highlighted the irrigation-induced impacts on global and regional water cycle, energy budget, near-surface climate. While land models are widely used to address this question, implementations of irrigation in these vary complexity. Here, we expand representation CLM enable six different methods. We find that using a combination methods, including default, sprinkler, flood paddy techniques performs best as determined by evaluating simulated withdrawals against observations, therefore select new scheme. Then, impact scheme surface fluxes is evaluated detected single-point simulations. Finally, compared both original The substantially reduces bias RMSE withdrawal USA other countries, but considerably overestimates Central China. Results experiments show methods effects fluxes, while magnitudes small. At scale, enlarges variables relative scheme, with varying across regions. Overall, our results suggest newly developed better tool for simulating climate, highlight added value incorporating human management Earth system models.