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Biogenic volatile organic compounds (BVOC) participate in reactions that canlead to secondarily formed ozone and particulate matter (PM) impacting airquality and climate. BVOC emissions are important inputs to chemicaltransport models applied on local to global scales but considerableuncertainty remains in the representation of canopy parameterizations andemission algorithms from different vegetation species. The Biogenic EmissionInventory System (BEIS) has been used to support both scientific andregulatory model assessments for ozone and PM. Here we describe a newversion of BEIS which includes updated input vegetation data and canopymodel formulation for estimating leaf temperature and vegetation data onestimated BVOC. The Biogenic Emission Landuse Database (BELD) was revised toincorporate land use data from the Moderate Resolution ImagingSpectroradiometer (MODIS) land product and 2006 National Land Cover Database(NLCD) land coverage. Vegetation species data are based on the US ForestService (USFS) Forest Inventory and Analysis (FIA) version 5.1 for 2002–2013and US Department of Agriculture (USDA) 2007 census ofagriculture data. This update results in generally higher BVOC emissionsthroughout California compared with the previous version of BEIS. Baselineand updated BVOC emission estimates are used in Community Multiscale AirQuality (CMAQ) Model simulations with 4 km grid resolution and evaluatedwith measurements of isoprene and monoterpenes taken during multiple fieldcampaigns in northern California. The updated canopy model coupled withimproved land use and vegetation representation resulted in better agreementbetween CMAQ isoprene and monoterpene estimates compared with theseobservations

Evaluation of improved land use and canopy representation in BEIS v3.61 with biogenic VOC measurements in California