Sensitivity of the Weather Research and Forecast/Community Multiscale Air Quality modeling system to MODIS LAI, FPAR, and albedo
2015
This study aims to improve land surface processes in a retrospective meteorology and air quality modeling system through the use of
Moderate Resolution Imaging Spectroradiometer(MODIS) vegetation and
albedoproducts for more realistic vegetation and surface representation. MODIS
leaf area index(LAI), fraction of absorbed
photosynthetically active radiation(FPAR), and
albedoare incorporated into the Pleim-Xiu land surface model (PX LSM) used in a combined meteorology and air quality modeling system. The current PX LSM intentionally exaggerates vegetation coverage and LAI in western dry lands so that its soil moisture nudging scheme is more effective in simulating surface temperature and mixing ratio. Reduced vegetation coverage from the PX LSM with MODIS input results in hotter and dryer daytime conditions with reduced ozone dry deposition velocities in much of western North America. Evaluations of the new system indicate greater error and bias in temperature, but reduced error and bias in moisture with the MODIS vegetation input. Hotter daytime temperatures and reduced dry deposition result in greater ozone concentrations in the western arid regions even with deeper boundary layer depths. MODIS
albedohas much less impact on the meteorology simulations than MODIS LAI and FPAR. The MODIS vegetation and
albedoinput does not have much influence in the east where differences in vegetation and
albedoparameters are less extreme. Evaluation results showing increased temperature errors with more accurate representation of vegetation suggests that improvements are needed in the model surface physics, particularly the soil processes in the PX LSM.
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