Abstract
Using data from a variety of sources, land use and vegetation in Texas were mapped with a spatial resolution of approximately 1 km. Over 600 classifications were used to characterize the land use and land cover throughout the state and field surveys were performed to assign leaf biomass densities, by species, to the land cover classifications. The total leaf biomass densities associated with these land use classifications ranged from 0 to 556 g/m 2, with the highest assigned total and oak leaf biomass densities located in central and eastern Texas. The land cover data were used as input to a biogenic emissions model, GLOBEIS2. Estimates of biogenic emissions of isoprene based on GLOBEIS2 and the new land cover data showed significant differences when compared to biogenic isoprene emissions estimated using previous land cover data and emission estimation procedures. For example, for one typical domain in eastern Texas, total daily isoprene emissions increased by 38% with the new modeling tools. These results may ultimately affect the way in which ozone and other photochemical pollutants are modeled and evaluated in the state of Texas.
Highlights
The state of Texas has several urban areas that fail to meet the National Ambient Air Quality Standards for ozone, including the Houston/Galveston, Beaumont/ Port Arthur and Dallas/Ft
A digital map of land use and vegetation was compiled for the state of Texas
The classifications with the highest assigned total and oak leaf biomass density are located in Central and Eastern Texas
Summary
The state of Texas has several urban areas that fail to meet the National Ambient Air Quality Standards for ozone, including the Houston/Galveston, Beaumont/ Port Arthur and Dallas/Ft. Numerous other urban areas within the state are considered ‘near non-attainment’ regions and have come close to exceeding, or have recently exceeded, the standards. Both photochemical modeling and ambient observations indicate that elevated atmospheric ozone concentrations are not limited to the urban areas, and extend throughout the eastern half of the State of Texas, including rural areas Much of Eastern and Central Texas contains significant amounts of vegetation and forests This vegetation may be the source of substantial emissions of biogenic volatile organic compounds (BVOCs), which, when mixed with nitrogen oxides from anthropogenic sources, can lead to ozone formation in rural areas This vegetation may be the source of substantial emissions of biogenic volatile organic compounds (BVOCs), which, when mixed with nitrogen oxides from anthropogenic sources, can lead to ozone formation in rural areas (e.g. Fehsenfeld et al, 1992; Guenther et al, 2000)
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
