Influence of LAI Change on Regional Climate Under Land-Atmosphere Coupling

As an important parameter to characterize land surface vegetation, leaf area index (LAI) is not only an important vegetation biophysical parameter that affects surface radiation transfer and material and energy balance, but also an important parameter to connect micro biogeochemical processes such as photosynthesis and respiration of vegetation. Because of the strong inhomogeneity of the lower land surface, correct description of the canopy structure as well as canopy physical and biogeochemical processes is the basis and prerequisite for the correct description of surface radiation characteristics and land-air interaction. In this paper, based on the Community Land Model (CLM4) and Data Assimilation Research Testbed (DART) developed by the National Center for Atmospheric Research (NCAR), the Global LAnd Surface Satellite (GLASS) LAI data are assimilated into the carbon and nitrogen component of CLM4 (CLM4-CN), and the impact of LAI change on climate change on a regional scale is further analyzed in the case of land-atmosphere coupling.