P95 Evaluation of dynamic vegetation process in WRF model

Byun, Ui-Yong, Jinkyu Hong, and Song-You Hong, Yonsei University, South Korea

The Leaf Area Index (LAI) is an essential parameter for studying atmosphere-vegetation interactions. The LAI is evolved dynamically interacting with atmospheric conditions through absorption of CO2 in photosynthesis and releasing of water vapor through evapotranspiration. The global LAI data including the seasonal change and spatial distribution is applied in Numerical Weather Prediction (NWP) models through the Land Surface Model (LSM). In recent studies on LSMs, seasonal variation of LAI is influenced by atmospheric condition, as well as dependent on land use type. In NOAH LSM, LAI is determined by only the land-use type. For this reason, there is a limitation in simulating the seasonal change of vegetation in the different atmospheric conditions. However, the NOAH-MP (multi physics) LSM considers the development, extinction and dormancy of vegetation. The leaf dynamics of NOAH-MP scheme describes a carbon budget for various parts of carbon pools - leaf, stem, root, wood, and soil. The objective of this study is to examine the LAI simulation ability of the NOAH and NOAH-MP LSM. In addition, effects of initial values of carbon pool on the LAI are verified.