Impact of climate and land cover changes on tropospheric ozone air quality and public health in East Asia between 1980 and 2010

Fu, Yue; Tai, Amos P. K.

doi:10.5194/acp-15-10093-2015

Cited by 64 publications

(56 citation statements)

References 50 publications

(54 reference statements)

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“…Future trends of tropospheric ozone strongly depend on the emission factors of the corresponding precursor compounds (i.e. VOC and NO x ) and indirectly also on land cover and character-istics of the vegetation (Dentener et al, 2006;IPCC, 2013;Fu and Tai, 2015). Some recent studies revealed a stabilization or even a lowering of the tropospheric background ozone concentrations in parts of the industrialized western countries since the turn of the millennium (Logan et al, 2012;Parrish et al, 2012;Oltmans et al, 2013;IPCC, 2013).…”

Section: Introductionmentioning

confidence: 99%

Plant surface reactions: an opportunistic ozone defence mechanism impacting atmospheric chemistry

et al. 2016

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Abstract. Elevated tropospheric ozone concentrations are considered a toxic threat to plants, responsible for global crop losses with associated economic costs of several billion dollars per year. Plant injuries have been linked to the uptake of ozone through stomatal pores and oxidative damage of the internal leaf tissue. But a striking question remains: can surface reactions limit the stomatal uptake of ozone and therefore reduce its detrimental effects to plants?In this laboratory study we could show that semi-volatile organic compounds exuded by the glandular trichomes of different Nicotiana tabacum varieties are an efficient ozone sink at the plant surface. In our experiments, different diterpenoid compounds were responsible for a strongly varietydependent ozone uptake of plants under dark conditions, when stomatal pores are almost closed. Surface reactions of ozone were accompanied by a prompt release of oxygenated volatile organic compounds, which could be linked to the corresponding precursor compounds: ozonolysis of cis-abienol (C 20 H 34 O) -a diterpenoid with two exocyclic double bonds -caused emissions of formaldehyde (HCHO) and methyl vinyl ketone (C 4 H 6 O). The ring-structured cembratrien-diols (C 20 H 34 O 2 ) with three endocyclic double bonds need at least two ozonolysis steps to form volatile carbonyls such as 4-oxopentanal (C 5 H 8 O 2 ), which we could observe in the gas phase, too.Fluid dynamic calculations were used to model ozone distribution in the diffusion-limited leaf boundary layer under daylight conditions. In the case of an ozone-reactive leaf surface, ozone gradients in the vicinity of stomatal pores are changed in such a way that the ozone flux through the open stomata is strongly reduced.Our results show that unsaturated semi-volatile compounds at the plant surface should be considered as a source of oxygenated volatile organic compounds, impacting gas phase chemistry, as well as efficient ozone sink improving the ozone tolerance of plants.

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Section: Introductionmentioning

confidence: 99%

Plant surface reactions: an opportunistic ozone defence mechanism impacting atmospheric chemistry

et al. 2016

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“…The 20-year climate change has led to large changes in the seasonal mean surface ozone concentration (±10 ppbv), mainly driven by changes in temperature and other meteorological variables, while the historical land use change induces decreases of summer mean surface ozone by up to 5-7 ppbv in the Northern Hemisphere due to deforestation and cropland expansion as discussed in recent studies (Fu and Tai, 2015;Heald and Geddes, 2016). Compared with those changes, we find that the influences of anthropogenic nitrogen deposition can be comparable at regional scales.…”

Section: Discussionmentioning

confidence: 99%

“…As listed in Table 2, we conduct the GEOSChem simulations by using the 1986-1990 MERRA fields (for comparison with the 2006-2010 fields) or the preindustrial land use data (1860 vs. the present-day condition for 2000), generally following the previous work of Fu and Tai (2015) and Heald and Geddes (2016). The impacts of climate change on wildfire emissions (Yue et al, 2015) are not considered here.…”

Section: Asynchronous Coupling and Model Experimentsmentioning

confidence: 99%

“…The GEOS-Chem model has been applied in a number of studies to simulate atmospheric nitrogen deposition Ellis et al, 2013;Zhao et al, 2015Zhao et al, , 2017, surface ozone air quality (Zhang et al, , 2014, and recently impacts of land use changes on atmospheric composition through biosphere-atmosphere exchange processes (Fu and Tai, 2015;Fu et al, 2016;Geddes et al, 2016;Heald and Geddes, 2016). It includes a detailed simulation of tropospheric NO x -VOC-O 3 -aerosol chemistry (Park et al, 2004;Mao et al, 2010).…”

Section: The Geos-chem Chemical Transport Modelmentioning

confidence: 99%

“…A number of studies have investigated how surface air quality may respond to perturbations of these processes driven by historical land use change (Fu and Tai, 2015;Val Martin et al, 2015;Fu et al, 2016;Heald and Geddes, 2016) and climate change (Fu and Tai, 2015;Fu et al, 2016). Atmospheric nitrogen deposition, by enhancing plant growth and soil mineral nitrogen content, is thus expected to modulate the production and loss of surface ozone.…”

mentioning

confidence: 99%

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Responses of surface ozone air quality to anthropogenic nitrogen deposition in the Northern Hemisphere

et al. 2017

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Abstract. Human activities have substantially increased atmospheric deposition of reactive nitrogen to the Earth's surface, inducing unintentional effects on ecosystems with complex environmental and climate consequences. One consequence remaining unexplored is how surface air quality might respond to the enhanced nitrogen deposition through surface-atmosphere exchange. Here we combine a chemical transport model (GEOS-Chem) and a global land model (Community Land Model, CLM) to address this issue with a focus on ozone pollution in the Northern Hemisphere. We consider three processes that are important for surface ozone and can be perturbed by the addition of atmospheric deposited nitrogen -namely, emissions of biogenic volatile organic compounds (VOCs), ozone dry deposition, and soil nitrogen oxide (NO x ) emissions. We find that present-day anthropogenic nitrogen deposition (65 Tg N a −1 to the land), through enhancing plant growth (represented as increases in vegetation leaf area index, LAI, in the model), could increase surface ozone from increased biogenic VOC emissions (e.g., a 6.6 Tg increase in isoprene emission), but it could also decrease ozone due to higher ozone dry deposition velocities (up to 0.02-0.04 cm s −1 increases). Meanwhile, deposited anthropogenic nitrogen to soil enhances soil NO x emissions. The overall effect on summer mean surface ozone concentrations shows general increases over the globe (up to 1.5-2.3 ppbv over the western US and South Asia), except for some regions with high anthropogenic NO x emissions (0.5-1.0 ppbv decreases over the eastern US, western Europe, and North China). We compare the surface ozone changes with those driven by the past 20-year climate and historical land use changes. We find that the impacts from anthropogenic nitrogen deposition can be comparable to the climate-and land-use-driven surface ozone changes at regional scales and partly offset the surface ozone reductions due to land use changes reported in previous studies. Our study emphasizes the complexity of biosphere-atmosphere interactions, which can have important implications for future air quality prediction.

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Interannual variability in ozone removal by a temperate deciduous forest

Clifton

Fiore

Munger

et al. 2017

Geophysical Research Letters

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The ozone (O3) dry depositional sink and its contribution to observed variability in tropospheric O3 are both poorly understood. Distinguishing O3 uptake through plant stomata versus other pathways is relevant for quantifying the O3 influence on carbon and water cycles. We use a decade of O3, carbon, and energy eddy covariance (EC) fluxes at Harvard Forest to investigate interannual variability (IAV) in O3 deposition velocities ( vd,O3). In each month, monthly mean vd,O3 for the highest year is twice that for the lowest. Two independent stomatal conductance estimates, based on either water vapor EC or gross primary productivity, vary little from year to year relative to canopy conductance. We conclude that nonstomatal deposition controls the substantial observed IAV in summertime vd,O3 during the 1990s over this deciduous forest. The absence of obvious relationships between meteorology and vd,O3 implies a need for additional long‐term, high‐quality measurements and further investigation of nonstomatal mechanisms.

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Impact of climate and land cover changes on tropospheric ozone air quality and public health in East Asia between 1980 and 2010

Cited by 64 publications

References 50 publications

Plant surface reactions: an opportunistic ozone defence mechanism impacting atmospheric chemistry

Plant surface reactions: an opportunistic ozone defence mechanism impacting atmospheric chemistry

Responses of surface ozone air quality to anthropogenic nitrogen deposition in the Northern Hemisphere

Interannual variability in ozone removal by a temperate deciduous forest

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