Evaluation of two isoprene emission models for use in a long-range air pollution model

Zare, Azimeh; Christensen, J. H.; Irannejad, Parviz; Brandt, Jørgen

doi:10.5194/acp-12-7399-2012

Cited by 31 publications

(30 citation statements)

References 31 publications

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“…Zare et al (2012) simulated isoprene overestimation for 4 European sites (between a factor 2 and 10), good agreement (within +/-30%) for 2 sites and an underestimation for 2 sites (also between a factor 2 and 10). However, none of the sites was located close to the Mediterranean Sea.…”

Section: Gaseous Speciesmentioning

confidence: 99%

“…The local character of the comparisons for biogenic VOCs was pointed out, as well as the fact that biogenic OA is formed at a regional scale from these precursors rather than a 10 local scale. Available regional comparisons show acceptable comparisons for BVOC observed and simulated concentrations (Curci et al, 2010 ;Zare et al, 2012 ;Fares et al, 2013).Therefore, a systematic misrepresentation of BVOC in the model seem to be unlikely. For aerosol species, low bias was seen for BC, while an overestimation in simulations is observed for sulfates.…”

Section: Particulate Speciesmentioning

confidence: 99%

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Simulation of fine organic aerosols in the western Mediterranean area during the ChArMEx 2013 summer campaign

Cholakian¹,

Beekmann²,

Colette³

et al. 2017

Preprint

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especially at several hundred meters height from the surface; however over the Gulf of Genoa near the surface, the anthropogenic origin is of similar importance. A general assessment of other species was performed to evaluate the robustness of the simulations for this particular domain before evaluating OA simulation schemes. It is also shown that the Cap Corse site presents important orographic complexity which makes comparison between model simulations and observations difficult. A method was designed to estimate an orographic representativeness error 5 for a list of species and yields an uncertainty of between 50-85% for primary pollutants, and around 2-10% for secondary species, for these species model to observations comparisons are only little impacted by orography.

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Section: Gaseous Speciesmentioning

confidence: 99%

Section: Particulate Speciesmentioning

confidence: 99%

Simulation of fine organic aerosols in the western Mediterranean area during the ChArMEx 2013 summer campaign

Cholakian¹,

Beekmann²,

Colette³

et al. 2017

Preprint

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show abstract

“…Jansen and De Serves, 1998;Lindfors and Laurila, 2000). Recently comparisons of European isoprene mixing ratios calculated online in a CTM with MEGAN against similar EMEP data for 2006 have also shown that there is a wide variability in agreement between different EMEP sites even when including yearly specific meteorological variability during the derivation of emission fluxes (Zare et al, 2012). Figure 8 shows the seasonal cycle in tropospheric CO as observed at 12 measurement sites in the GMD network, with the location of each measurement site being given in the figure caption.…”

Section: Isoprenementioning

confidence: 99%

“…global isoprene and terpene emissions have already received some attention in the literature (e.g. Arneth et al, 2008;Williams et al, 2009;Zare et al, 2012). Figure 2a-d shows the seasonal climatological cycles for CO, C 2 H 4 , C 2 H 6 and CH 3 COCH 3 for each of the four chosen BVOC inventories (solid lines) both globally and for each of the five pre-defined regions.…”

Section: Comparison Of Biogenic Emission Inventoriesmentioning

confidence: 99%

Quantifying the uncertainty in simulating global tropospheric composition due to the variability in global emission estimates of Biogenic Volatile Organic Compounds

2013

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Abstract. The emission of organic compounds from biogenic processes acts as an important source of trace gases in remote regions away from urban conurbations, and is likely to become more important in future decades due to the further mitigation of anthropogenic emissions that affect air quality and climate forcing. In this study we examine the contribution of biogenic volatile organic compounds (BVOCs) towards global tropospheric composition using the global 3-D chemistry transport model TM5 and the recently developed modified CB05 chemical mechanism. By comparing regional BVOC emission estimates we show that biogenic processes act as dominant sources for many regions and exhibit a large variability in the annually and seasonally integrated emission fluxes. By performing sensitivity studies we find that the contribution of BVOC species containing between 1 to 3 carbon atoms has an impact on the resident mixing ratios of tropospheric O3 and CO, accounting for ~2.5% and ~10.8% of the simulated global distribution, respectively. This is approximately a third of the cumulative effect introduced by isoprene and the monoterpenes. By examining an ensemble of 3-D global chemistry transport simulations which adopt different global BVOC emission inventories we determine the associated uncertainty introduced towards simulating the composition of the troposphere for the year 2000. By comparing the model ensemble values against a composite of atmospheric measurements we show that the effects on tropospheric O3 are limited to the lower troposphere (with an uncertainty between −2% to 10%), whereas that for tropospheric CO extends up to the upper troposphere (with an uncertainty of between 10 to 45%). Comparing the mixing ratios for low molecular weight alkenes in TM5 against surface measurements taken in Europe implies that the cumulative emission estimates are too low, regardless of the chosen BVOC inventory. This variability in the global distribution of CO due to BVOC emissions introduces an associated uncertainty in the tropospheric CO burden of 11.4%, which impacts strongly on the oxidative capacity of the troposphere, introducing an uncertainty in the atmospheric lifetime of the greenhouse gas CH4 of ~3.3%. This study thus identifies the necessity of placing further constraints on non-CH4 global biogenic emission estimates in large-scale global atmospheric chemistry models.

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“…GEOS-Chem and other chemical transport models have previously shown a large sensitivity to land cover data sets (Li et al, 2013) and biogenic emission models (Fiore, 2005;Kim et al, 2014;Zare et al, 2012). Globally, we find annual emissions of isoprene decrease by 14 % from 531 to 459 Tg yr −1 with land use harmonization and updated emission factors.…”

Section: Impact Of Updates and Land Use Harmonization On Geos-chem Simentioning

confidence: 58%

Land cover change impacts on atmospheric chemistry: simulating projected large-scale tree mortality in the United States

et al. 2016

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Abstract. Land use and land cover changes impact climate and air quality by altering the exchange of trace gases between the Earth's surface and atmosphere. Large-scale tree mortality that is projected to occur across the United States as a result of insect and disease may therefore have unexplored consequences for tropospheric chemistry. We develop a land use module for the GEOS-Chem global chemical transport model to facilitate simulations involving changes to the land surface, and to improve consistency across land-atmosphere exchange processes. The model is used to test the impact of projected national-scale tree mortality risk through 2027 estimated by the 2012 USDA Forest Service National Insect and Disease Risk Assessment. Changes in biogenic emissions alone decrease monthly mean O 3 by up to 0.4 ppb, but reductions in deposition velocity compensate or exceed the effects of emissions yielding a net increase in O 3 of more than 1 ppb in some areas. The O 3 response to the projected change in emissions is affected by the ratio of baseline NO x : VOC concentrations, suggesting that in addition to the degree of land cover change, tree mortality impacts depend on whether a region is NO x -limited or NO x -saturated. Consequently, air quality (as diagnosed by the number of days that 8 h average O 3 exceeds 70 ppb) improves in polluted environments where changes in emissions are more important than changes to dry deposition, but worsens in clean environments where changes to dry deposition are the more important term. The influence of changes in dry deposition demonstrated here underscores the need to evaluate treatments of this physical process in models. Biogenic secondary organic aerosol loadings are significantly affected across the US, decreasing by 5-10 % across many regions, and by more than 25 % locally. Tree mortality could therefore impact background aerosol loadings by between 0.5 and 2 µg m −3 . Changes to reactive nitrogen oxide abundance and partitioning are also locally important. The regional effects simulated here are similar in magnitude to other scenarios that consider future biofuel cropping or natural succession, further demonstrating that biosphere-atmosphere exchange should be considered when predicting future air quality and climate. We point to important uncertainties and further development that should be addressed for a more robust understanding of land cover change feedbacks.

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Evaluation of two isoprene emission models for use in a long-range air pollution model

Cited by 31 publications

References 31 publications

Simulation of fine organic aerosols in the western Mediterranean area during the ChArMEx 2013 summer campaign

Simulation of fine organic aerosols in the western Mediterranean area during the ChArMEx 2013 summer campaign

Quantifying the uncertainty in simulating global tropospheric composition due to the variability in global emission estimates of Biogenic Volatile Organic Compounds

Land cover change impacts on atmospheric chemistry: simulating projected large-scale tree mortality in the United States

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