1995-05-20 | Alex Guenther, C. Nicholas Hewitt, David Erickson, Ray Fall, Chris Geron, Tom Graedel, Peter Harley, Lee Klinger, Manuel Lerdau, W. A. McKay, Tom Pierce, Bob Scholes, Rainer Steinbrecher, Raja Tallamraju, John Taylor, Pat Zimmerman
The paper presents a global model for estimating natural volatile organic compound (NVOC) emissions, focusing on isoprene and monoterpenes. The model uses a highly resolved spatial grid (0.5° × 0.5° latitude/longitude) and generates hourly average emission estimates. NVOC emissions from oceans are estimated based on geophysical variables from a general circulation model and ocean color satellite data, while emissions from plant foliage are estimated using ecosystem-specific biomass and emission factors, along with algorithms describing light and temperature dependence. The annual global VOC flux is estimated to be 1150 Tg C, with isoprene contributing 44%, monoterpenes 11%, other reactive VOC (ORVOC) 22.5%, and other VOC (OVOC) 22.5%. Tropical woodlands contribute about half of all global natural VOC emissions, followed by croplands, shrublands, and other woodlands. The model's uncertainties are discussed, particularly for compounds other than isoprene and monoterpenes, and the need for further research is highlighted.The paper presents a global model for estimating natural volatile organic compound (NVOC) emissions, focusing on isoprene and monoterpenes. The model uses a highly resolved spatial grid (0.5° × 0.5° latitude/longitude) and generates hourly average emission estimates. NVOC emissions from oceans are estimated based on geophysical variables from a general circulation model and ocean color satellite data, while emissions from plant foliage are estimated using ecosystem-specific biomass and emission factors, along with algorithms describing light and temperature dependence. The annual global VOC flux is estimated to be 1150 Tg C, with isoprene contributing 44%, monoterpenes 11%, other reactive VOC (ORVOC) 22.5%, and other VOC (OVOC) 22.5%. Tropical woodlands contribute about half of all global natural VOC emissions, followed by croplands, shrublands, and other woodlands. The model's uncertainties are discussed, particularly for compounds other than isoprene and monoterpenes, and the need for further research is highlighted.