Models and observations of the impact of natural hydrocarbons on rural ozone

Canopy level emissions of 2-methyl-3-buten-2-ol, monoterpenes, and sesquiterpenes from an experimental Pinus taeda plantation

“…Over 80% of new plantations are established with genetically improved P. taeda seedlings (McKeand et al, 2003), produced via controlled pollination, cloning, and tissue culture, with the goals of improving biomass production, stem/fiber quality, crown characteristics, and disease resistance. Since the southeastern U.S. has persistent PM 2.5 and O 3 air quality problems that are complicated by BVOC emissions (Carlton et al, 2009;Trainer et al, 1987), it is important to improve understanding of BVOC fluxes from P. taeda, characterize BVOC emission model performance, and examine effects such as genetic and regional variability on BVOC emissions.…”

“…The importance of isoprene and monoterpenes in atmospheric chemistry and air quality analyses has been well documented (Trainer et al, 1987). Based on published sesquiterpene aerosol yields and branch enclosure measurements from P. taeda, Helmig et al (2006) determined that sesquiterpenes can significantly impact secondary organic aerosol (SOA) concentrations in the southeastern U.S. Carlton et al (2009) conclude that "Global biogenic emissions of isoprene (600 Tg yr −1 ) are sufficiently large that the formation of SOA in even small yields results in substantial production of atmospheric particulate matter, likely having implications for air quality and climate".…”

Past and present-day biogenic volatile organic compound emissions in East Asia

“…Subsequent studies further defined the speciation, magnitude, and mechanisms of biogenic VOC emissions from specific vegetation sources (Guenther et al, , 2000Harley et al, 1999;Helmig et al, 1998Helmig et al, , 1999Lamb et al, 1985;Rasmussen, 1972;Simpson et al, 1995Simpson et al, , 1999Fall and Wildermuth, 1998;Zimmerman, 1979). These detailed studies allowed other investigators to assess the relative importance of biogenic and anthropogenic VOC emissions and their respective roles in the formation of local and regionalscale photochemical smog (Chameides et al, 1988;Fehsenfeld et al, 1992;Geron et al, 1994;Lamb et al, 1987;NRC, 1991;Pierce et al, 1991Pierce et al, , 1998Roselle et al, 1991;Trainer et al, 1987). It has been found that, depending upon climatic conditions and land-cover characteristics, biogenic VOC emissions can be as large as or even larger than anthropogenic sources and, if sufficient NO x is present, can amplify the production rates of photochemical smog.…”

Atmospheric volatile organic compounds (VOC) at a remote tropical forest site in central Amazonia

“…They can directly or indirectly increase the acidity of the atmosphere and provide the starting material for much of the natural atmospheric aerosol (Graedel, 1979;Altshuller, 1983;Yokouchi and Ambe, 1985;Trainer et al, 1987;Chameides et al, 1988;Warneck, 1988;Kotzias et al, 1989;Atkinson, 1990;Brasseur and Chat"eld, 1991;Pandis et al, 1991;Fehsenfeld et al, 1992;Andreae and Crutzen, 1997;Christo!ersen et al, 1998;Kavouras et al, 1998Kavouras et al, , 1999Calogirou et al, 1999). Having in mind this important role of VOCs, a detailed description of the atmospheric concentrations and the exchange processes on a local and regional scale as well as a better understanding of the biological production and the chemical fate of all these compounds in the atmosphere is urgently needed, especially in the tropics where our knowledge is poorest.…”