A biogenic hydrocarbon emission inventory for the U.S.A. using a simple forest canopy model

Abstract A biogenic hydrocarbon emission inventory system, developed for acid deposition and regional oxidant modeling, is described, and results for a U.S. emission inventory are presented. For deciduous and coniferous forests, scaling relationships are used to account for canopy effects upon solar radiation temperature, humidity and wind speed as a function of height through the canopy. Leaf temperature is calculated iteratively from a leaf energy balance as a function of height through the canopy. The predicted light and temperature levels are used with mean emprical emission rate factors and laboratory emission algorithms to predict hydrocarbon emission rates. For application to a U.S. inventory, diurnal emission fluxes of isoprene, α-pinene, other monoterpenes adn otehr hydrocarbons are predicted for eight land cover classes by state climatic division by month. The total U.S. emissions range from 22 to 50 Tg yr −1 depending upon the formulation of different emission rate factors. In the case where the forest canopy model is not used, the isoprene emissions increase by 50% and terpene emissions increase by 6%. In case study analyses, the predicted leaf temperatures were within 1–2°C of observed for a deciduous forest, and predicted emissions were within a factor of two of observations. Further evaluation of the inventory using field measurements is required to determine the overall accuracy of the emission estimates.

[1]  D. M. Gates,et al.  Atlas of Energy Budgets of Plant Leaves. , 1972 .

[2]  A numerical model for simulating the radiation regime within a deciduous forest canopy , 1989 .

[3]  A. Winer,et al.  Investigation of the role of natural hydrocarbons in photochemical smog formation in California. Final report 19 Jun 79-18 Sep 80 , 1981 .

[4]  Randal S. Martin,et al.  Measurement of isoprene and its atmospheric oxidation products in a central Pennsylvania deciduous forest , 1991 .

[5]  Hal Westberg,et al.  A national inventory of biogenic hydrocarbon emissions , 1987 .

[6]  Russell K. Monson,et al.  Isoprene and monoterpene emission rate variability: Observations with Eucalyptus and emission rate algorithm development , 1991 .

[7]  D. Olszyk,et al.  Emission rates of organics from vegetation in California's Central Valley , 1992 .

[8]  A. Winer.  Hydrocarbon emissions from vegetation found in California's central valley. , 1989 .

[9]  Tilden P. Meyers,et al.  Modelling the plant canopy micrometeorology with higher-order closure principles , 1987 .

[10]  D. M. Gates.  Transpiration and Leaf Temperature , 1968 .

[11]  S. Tajchman.  Comments on Measuring Turbulent Exchange Within and Above Forest Canopy , 1981 .

[12]  Richard H. Waring,et al.  Leaf area differences associated with old-growth forest communities in the western Oregon Cascades , 1976 .

[13]  J. Reagan,et al.  Comparison of natural and man-made hydrocarbon emission inventories necessary for regional acid deposition and oxidant modeling , 1986 .

[14]  A. Winer,et al.  The emission of (Z)-3-hexen-1-ol, (Z)-3-hexenylacetate and other oxygenated hydrocarbons from agricultural plant species , 1991 .

[15]  Ramakrishna R. Nemani,et al.  Mapping regional forest evapotranspiration and photosynthesis by coupling satellite data with ecosystem simulation , 1989 .

[16]  D. M. Gates.  Energy Exchange in the Biosphere , 1963 .

[17]  T. Pierce,et al.  PC-BEIS: A Personal Computer Version of the Biogenic Emissions Inventory System , 1991 .

[18]  Heat balance of the plant cover , 1977 .

[19]  B. Lamb,et al.  Biogenic hydrocarbon emissions from deciduous and coniferous trees in the United States , 1985 .

[20]  J. Arey,et al.  Monoterpene emission rate measurements from a Monterey pine , 1990 .

[21]  K. Kourtidis,et al.  Biosphere/Atmosphere interactions: Integrated research in a European coniferous forest ecosystem , 1992 .

[22]  D. Olszyk,et al.  Terpenes emitted from agricultural species found in California's Central Valley , 1991 .