Monoterpene and Sesquiterpene Emission Estimates for the United States

Abstract

Biogenic volatile organic compounds (BVOC) contribute significantly to the formation of ozone and secondary organic aerosol (SOA). The Model of Emissions of Gases and Aerosols from Nature (MEGANv2.02) is used to estimate emissions of isoprene, monoterpenes (MT), and sesquiterpenes (SQT) across the United States. Compared to the Biogenic Emission Inventory System (BEIS3.0), MEGANv2.02 estimates higher isoprene but lower MT emissions for July 2001 and January 2002. A sensitivity study of SQT and MT emission factors and algorithm parameters was conducted by assigning values to four plant functional types (PFTs) using both recent measurements and literature values. The standard deviations of the emissions factors within these PFTs were two to four times the averages because of the variation in experimental basal emissions rate data. More recently published SQT and MT basal emission rates are generally lower than those reported in the literature through 2004. With the new emissions factors, monthly average SQT emission rates for the contiguous United States are equal to 16% of the MT emissions during July and 9% of the emissions during January. The SQT emissions distribution is strongly influenced by the grass and crop PFT, for which SQT emissions data are quite limited.

Improved land cover and emission factors for modeling biogenic volatile organic compounds emissions from Hong Kong

“…It is computed based on the weather data as described in Section 3.3 and the LAI data as described in Section 3.2.4. g age is calculated with a leaf age algorithm that assigns different emission activities to new, growing, mature, and old leaves (Guenther et al, 2006;Sakulyanontvittaya et al, 2008). There is observational evidence that moderate (or intermittent) drought can increase the isoprene emission while extended drought will decrease isoprene emissions (Guenther et al, 2006).…”

“…As Hong Kong did not have any serious drought during the study period, it is reckoned that normal soil moisture existed, which did not impose any significant effect on the BVOC emissions in the present study. Also note that different VOC species (isoprene, monoterpenes, sesquiterpenes) have different temperature-and light-dependence factors and algorithms (Kesselmeier and Staudt, 1999;Sakulyanontvittaya et al, 2008) and this can be represented in MEGAN. The parameterized canopy environment emission activity (PCEEA) algorithm was used (Guenther et al, 2006).…”

“…Heald et al, 2009). Recently, Sakulyanontvittaya et al (2008) used MEGAN version 2.02 to estimate emissions of BVOCs across the United States with a focus on monoterpenes and sesquiterpenes in particular. Some emission factors are provided in their paper based on recent laboratory measurements.…”

“…Some emission factors are provided in their paper based on recent laboratory measurements. When compared to the Biogenic Emission Inventory System (BEIS 3.0), MEGAN was found to estimate higher isoprene but lower monoterpene emissions for the period between July 2001 and January 2002 (Sakulyanontvittaya et al, 2008).…”

<sup>13</sup>C labelling study of constitutive and stress-induced terpenoide missions from Norway spruce and Scots pine

“…So far, the light intensity dependence of sesquiterpene emissions has not been clear (Sakulyanontvittaya et al, 2008;10 Guenther et al, 2012). Hansen and Seufert (2003) compared the prediction of short-term variations of β-caryophyllene emissions from orange trees (Citrus sinensis L.) with an algorithm accounting exclusively for temperature dependence and with another including both light and temperature dependence.…”