Isoprene and monoterpene fluxes measured above Amazonian rainforest and their dependence on light and temperature

Rinne, Janne; Guenther, Alex; Greenberg, J.; Harley, P. C.

doi:10.1016/s1352-2310(01)00523-4

Cited by 198 publications

(171 citation statements)

References 45 publications

(26 reference statements)

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“…There is an increasing experimental evidence ( Fig. 15; Rinne et al, 2002;Kuhn et al, 2002;Karl et al, 2004) that monoterpene emissions in the Amazonian tropical forest are strongly light dependent and the results suggest that the LDF factor for monoterpenes emitted in this region should be set close to 1.…”

Section: Global and Regional Totals Of Other Speciesmentioning

confidence: 99%

Global data set of biogenic VOC emissions calculated by the MEGAN model over the last 30 years

et al. 2014

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Abstract. The Model of Emissions of Gases and Aerosols from Nature (MEGANv2.1) together with the ModernEra Retrospective Analysis for Research and Applications (MERRA) meteorological fields were used to create a global emission data set of biogenic volatile organic compounds (BVOC) available on a monthly basis for the time period of 1980-2010. This data set, developed under the Monitoring Atmospheric Composition and Climate project (MACC), is called MEGAN-MACC. The model estimated mean annual total BVOC emission of 760 Tg (C) yr −1 consisting of isoprene (70 %), monoterpenes (11 %), methanol (6 %), acetone (3 %), sesquiterpenes (2.5 %) and other BVOC species each contributing less than 2 %.Several sensitivity model runs were performed to study the impact of different model input and model settings on isoprene estimates and resulted in differences of up to ±17 % of the reference isoprene total. A greater impact was observed for a sensitivity run applying parameterization of soil moisture deficit that led to a 50 % reduction of isoprene emissions on a global scale, most significantly in specific regions of Africa, South America and Australia.MEGAN-MACC estimates are comparable to results of previous studies. More detailed comparison with other isoprene inventories indicated significant spatial and temporal differences between the data sets especially for Australia, Southeast Asia and South America. MEGAN-MACC estimates of isoprene, α-pinene and group of monoterpenes showed a reasonable agreement with surface flux measurements at sites located in tropical forests in the Amazon and Malaysia. The model was able to capture the seasonal variation of isoprene emissions in the Amazon forest.

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Section: Global and Regional Totals Of Other Speciesmentioning

confidence: 99%

Global data set of biogenic VOC emissions calculated by the MEGAN model over the last 30 years

et al. 2014

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“…This maximum value is just over 50 % higher than a previous report (0.73 mg C m −2 h −1 ) for highlatitude Salix plantation (58 • N, Olofsson et al, 2005). To put this in perspective, a northern hardwood forest in Michigan had average midday fluxes of 3 mg C m −2 h −1 over the entire growing season (Pressley et al, 2005), and several short data sets of emissions from tropical ecosystems give estimates of approximately 2.5 mg C m −2 h −1 (Rinne et al, 2002;Karl et al, 2004). This tundra ecosystem has a much lower LAI than both the mid-latitude and tropical forested ecosystems.…”

Section: Eddy Covariance Measurementsmentioning

confidence: 99%

“…Most field studies of isoprene emissions have focused on temperate ecosystems (e.g., Goldstein et al, 1995;Pressley et al, 2005;McKinney et al, 2011) due to accessibility and tropical ecosystems (e.g., Geron et al, 2002;Rinne et al, 2002;Langford et al, 2010) because warm temperatures, high biomass densities, and long growing seasons drive globally significant fluxes. Other studies have stretched from savannahs (e.g., Guenther et al, 1996;Otter et al, 2003) to boreal forests (e.g., Rinne et al, 2000;Spirig et al, 2004).…”

Section: Introductionmentioning

confidence: 99%

Isoprene emissions from a tundra ecosystem

et al. 2013

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Whole-system fluxes of isoprene from a moist acidic tundra ecosystem and leaf-level emission rates of isoprene from a common species (Salix pulchra) in that same ecosystem were measured during three separate field campaigns. The field campaigns were conducted during the summers of 2005, 2010 and 2011 and took place at the Toolik Field Station (68.6° N, 149.6° W) on the north slope of the Brooks Range in Alaska, USA. The maximum rate of whole-system isoprene flux measured was over 1.2 mg C m−2 h−1 with an air temperature of 22 °C and a PAR level over 1500 μmol m−2 s−1. Leaf-level isoprene emission rates for S. pulchra averaged 12.4 nmol m−2 s−1 (27.4 μg C gdw−1 h−1) extrapolated to standard conditions (PAR = 1000 μmol m−2 s−1 and leaf temperature = 30 °C). Leaf-level isoprene emission rates were well characterized by the Guenther algorithm for temperature with published coefficients, but less so for light. Chamber measurements from a nearby moist acidic tundra ecosystem with little S. pulchra emitted significant amounts of isoprene, but at lower rates (0.45 mg C m−2 h−1) suggesting other significant isoprene emitters. Comparison of our results to predictions from a global model found broad agreement, but a detailed analysis revealed some significant discrepancies. An atmospheric chemistry box model predicts that the observed isoprene emissions have a significant impact on Arctic atmospheric chemistry, including a reduction of hydroxyl radical (OH) concentrations. Our results support the prediction that isoprene emissions from Arctic ecosystems will increase with global climate change

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“…For example, if there are age-related changes in leaf structure, CO 2 assimilation rates, nitrogen concentration, canopy structure and stand productivity, will biogenic emissions differ from those measured at younger stands? Progress has been made in developing reliable micrometeorological techniques for measuring canopy scale monoterpene fluxes (Rinne et al, 2002;Schween et al, 1997); however, determining species-specific standard emission rates requires enclosure techniques. In addition, understanding physiological controls of monoterpene emissions (such as differences in emission rates from various heights within the canopy) requires detailed spatial sampling techniques not available with above canopy flux measurements.…”

Section: Article In Pressmentioning

confidence: 99%

Monoterpene emissions from a Pacific Northwest Old-Growth Forest and impact on regional biogenic VOC emission estimates

Pressley

Lamb

Westberg

et al. 2004

Atmospheric Environment

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Measurements of natural hydrocarbon emission rates are reported for an old-growth Pacific Northwest coniferous forest. The emission data were collected for the two dominant species Douglas-fir (Pseudotsuga menziesii) and western hemlock (Tsuga heterophylla) during the growing season in 1997 and 1998 using branch enclosure techniques. Samples were collected at different heights from 13 to 51 m within the canopy using the Wind River Canopy Crane facility. The standard emission factor at a temperature of 30 C and the temperature coefficient for Douglas-fir is E s ¼ 0:3970:14 mg C g À1 h À1 and b ¼ 0:1470:05 C À1 and for western hemlock E s ¼ 0:9570:17 mg C g À1 h À1 and b ¼ 0:0670:02 C À1 : There was considerable variability among all the emission factors due to seasonal and branch-tobranch variations. Within season emission factors appear to decline from May to September for the Douglas-fir, although there was no corresponding decrease for the western hemlock. There was no significant difference in standard emission factors (E s ) or temperature coefficients as a function of sunlit versus shady growth environment (different heights) for Douglas-fir, but western hemlock emission samples collected low in the canopy showed no exponential correlation with temperature. Applying the standard emission factors from this study to a Pacific Northwest domain and comparing the modified emission inventory to the current regulatory-based emission inventory yielded a net decrease of 19% in the domain wide monoterpene emissions. The relatively small difference in biogenic emissions is slightly misleading, as the difference in standard emission rates between this study and current regulatory rates is quite significant, and they offset each other when combined in this domain. When this inventory was input into a regional photochemical air quality simulation using the MM5/CMAQ system, the reduction in biogenic emissions resulted in an insignificant decrease of O 3 and a significant decrease in the secondary organic aerosol (domain wide À20%). The emission measurements reported here represent one of the first extensive data sets for an old-growth forest, where sampling conditions are limited to in situ enclosure techniques within the tall, elevated canopy. r

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Isoprene and monoterpene fluxes measured above Amazonian rainforest and their dependence on light and temperature

Cited by 198 publications

References 45 publications

Global data set of biogenic VOC emissions calculated by the MEGAN model over the last 30 years

Global data set of biogenic VOC emissions calculated by the MEGAN model over the last 30 years

Isoprene emissions from a tundra ecosystem

Monoterpene emissions from a Pacific Northwest Old-Growth Forest and impact on regional biogenic VOC emission estimates

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