Modelling ozone deposition fluxes: The relative roles of deposition and detoxification processes

Tuzet, Andrée; Perrier, Alain; Loubet, Benjamin; Cellier, Pierre

doi:10.1016/j.agrformet.2010.12.004

Cited by 40 publications

(37 citation statements)

References 51 publications

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“…11) due to decreasing levels of irradiance. A similar pattern was observed by Emberson et al (2000) and Tuzet et al (2011) who concluded that reduction in g sto in the early evening was due to decreasing irradiance and air and soil humidity; yet, ideal conditions for conductance occurred in the morning. Also, Gerosa et al (2003) showed that afternoon high O 3 concentrations are thus less harmful than the same ones in the morning.…”

Section: Ambient Ozone Levelssupporting

confidence: 77%

Stomatal ozone flux and visible leaf injury in native juvenile trees of Fagus sylvatica L.: a field study from the Jizerske hory Mts., the Czech Republic

Vlasáková-Matoušková

Hůnová

2015

Environ Sci Pollut Res

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The study was carried out at six sites in the Jizerskehory Mts. in the north of the Czech Republic. At all these sites, ranging in altitude between 460 and 962 m a. s. l., and during the period from June to September in 2008, O3 concentrations and environmental parameters important for accumulated stomatal O3 flux (AFst) into Fagus sylvatica leaves were measured. At five sites, visible injury on Fagus sylvatica L. juvenile tree leaves was observed. A combination of actual O3 levels in the Jizerkehory Mts. and environmental conditions, though relative air humidity and air temperature significantly limited stomatal conductance, has been sufficient enough to cause O3 uptake exceeding the critical level (CL) for forest ecosystems. The AFst values ranged between 13.4 and 22.3 mmol O3 m(-2). The CL for the accumulated stomatal flux of O3 above a flux threshold 1.6 nmol m(-2) s(-1) (AFst1.6) was exceeded at all sites from ca 45 to 270% (160% on average). The CL of 5 ppm h(-1) for AOT40 (accumulated O3 exposure above threshold of 40 ppb) was exceeded at four sites. The relationship between visible injury on O3 indices was found. The conclusions based on AOT40 and AFSt are not the same. AFSt has been determined as better predictor of visible injury than AOT40.

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Section: Ambient Ozone Levelssupporting

confidence: 77%

Stomatal ozone flux and visible leaf injury in native juvenile trees of Fagus sylvatica L.: a field study from the Jizerske hory Mts., the Czech Republic

Vlasáková-Matoušková

Hůnová

2015

Environ Sci Pollut Res

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“…Biochemical models, e.g. SODA (Simulated Ozone Detoxification in the Apoplast) and MODD (Model of Ozone Deposition and Detoxification) (Tuzet et al, 2011) could be used to quantify diurnal changes of the O 3 detoxification capacity. Linking the diurnal change of detoxification with the information of hourly O 3 concentrations and stomatal O 3 flux, effective O 3 flux can be defined as a more reliable and precise measure of O 3 impacts.…”

Section: Discussionmentioning

confidence: 99%

Diurnal variation of apoplastic ascorbate in winter wheat leaves in relation to ozone detoxification

Wang

Pang

Feng

et al. 2015

Environmental Pollution

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a b s t r a c tBesides stomatal closure, biological detoxification is an important protection mechanism for plants against ozone (O 3 ). This study investigated the diurnal changes of ascorbate (a major detoxification agent) in the apoplast and leaf tissues of winter wheat grown under ambient air field conditions. Results showed the reduced ascorbate in the apoplast (ASC apo ) exhibited a peak in late morning or midday, mismatching with either the maximum external O 3 concentrations in mid-afternoon or the maximum stomatal O 3 uptake between late morning and mid-afternoon. In contrast, the ASC in leaf tissues remained stable throughout the day. The investigations conducted in a Free-Air Concentration Elevation of O 3 system confirmed that the diurnal variations of the ASC apo were induced more by the daily variations of O 3 concentrations rather than the cumulative O 3 effects. In conclusion, the O 3 -stress detoxification should be a dynamic variable rather than a fixed threshold as assumed in the stomatal flux-based O 3 dose metrics.

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“…Whether it is possible to separate the components of R ns (R c2 -external surfaces; R c3 -soil; R c4 -in-canopy chemistry) depends on the nature of the measurement site and canopy, and there are some models available based on measurements over bare soil, senescent vegetation and in-canopy chemistry (Launiainen et al, 2013;Fares et al, 2013bFares et al, , 2012Büker et al, 2012;Tuzet et al, 2011;Stella et al, 2011). Many research groups have taken this approach, and Table 1 provides a summary of some of the different estimates of the values for R ns in the literature.…”

Section: B Non-stomatal Uptakementioning

confidence: 99%

Tropospheric ozone and its precursors from the urban to the global scale from air quality to short-lived climate forcer

et al. 2015

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Abstract. Ozone holds a certain fascination in atmospheric science. It is ubiquitous in the atmosphere, central to tropospheric oxidation chemistry, yet harmful to human and ecosystem health as well as being an important greenhouse gas. It is not emitted into the atmosphere but is a byproduct of the very oxidation chemistry it largely initiates. Much effort is focused on the reduction of surface levels of ozone owing to its health and vegetation impacts, but recent efforts to achieve reductions in exposure at a country scale have proved difficult to achieve owing to increases in background ozone at the zonal hemispheric scale. There is also a growing realisation that the role of ozone as a short-lived climate pollutant could be important in integrated air quality climate change mitigation. This review examines current understanding of the processes regulating tropospheric ozone at global to local scales from both measurements and models. It takes the view that knowledge across the scales is important for dealing with air quality and climate change in a synergistic manner. The review shows that there remain a number of clear challenges for ozone such as explaining surface trends, incorporating new chemical understanding, ozone-climate coupling, and a better assessment of impacts. There is a clear and present need to treat ozone across the range of scales, a transboundary issue, but with an emphasis on the hemispheric scales. New observational opportunities are offered both by satellites and small sensors that bridge the scales.

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Modelling ozone deposition fluxes: The relative roles of deposition and detoxification processes

Cited by 40 publications

References 51 publications

Stomatal ozone flux and visible leaf injury in native juvenile trees of Fagus sylvatica L.: a field study from the Jizerske hory Mts., the Czech Republic

Stomatal ozone flux and visible leaf injury in native juvenile trees of Fagus sylvatica L.: a field study from the Jizerske hory Mts., the Czech Republic

Diurnal variation of apoplastic ascorbate in winter wheat leaves in relation to ozone detoxification

Tropospheric ozone and its precursors from the urban to the global scale from air quality to short-lived climate forcer

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