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Surface roughness length for heat (m) in the Control (a, b) and MODIFIED (c, d) simulations during the pre-monsoon (a, c) and monsoon (b, d) seasons.
SEASONAL DIFFERENCES IN THE LAND-ATMOSPHERE COUPLING OVER SOUTH ASIA SIMULATED USING A REGIONAL CLIMATE MODEL
Main Findings (Rakesh and Takahashi 2020, Geographical Reports of Tokyo Metropolitan University)
- Default WRF coupled with NOAH land surface model configuration overestimated the roughness length for heat over short vegetation and underestimated the same metric over tall vegetation, leading to a larger sensible heat flux over South Asia.
- A modified NOAH LSM reduced the over-estimation of roughness length for heat, and thus reduced the sensible heat flux.
- A dry precipitation bias during the onset phase of the Indian summer monsoon over central India was found to be effectively reduced in the modified NOAH land surface model.
