Development and evaluation of an ozone deposition scheme for coupling to a terrestrial biosphere model

Franz, Martina; Simpson, David; Arneth, Almut; Zaehle, Sönke

doi:10.5194/bg-14-45-2017

Cited by 24 publications

(88 citation statements)

References 110 publications

(131 reference statements)

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“…Globally, concentrations of O 3 predicted for 2100 reduced GPP by 14 to 23 % using a former parameterisation of O 3 sensitivity in JULES (Sitch et al, 2007). The recent study by Franz et al (2017) showed mean GPP declined by 4.7 % over the period 2001 to 2010 using the OCN model over the same European domain and using the same O 3 forcing produced by EMEP MSC-W as used in this study. Our estimates of changes in present-day GPP and NPP are at the lower end of previously modelled estimates.…”

Section: Comparison Of Modelled Estimates Of O 3 Damagementioning

confidence: 56%

“…A similar approach is taken by Franz et al (2017) in the OCN model; however plant O 3 damage is a function of accumulated O 3 exposure over time. In JULES, plant O 3 damage is instantaneous because the impact of cumulative O 3 exposure on plant productivity has already been calibrated with observations (described below).…”

Section: Representation Of O 3 Effects In Julesmentioning

confidence: 99%

“…This set-up (EMEP + RCA3) is also used by Langner et al (2012a), Simpson et al (2014a), Tuovinen et al (2013), Franz et al (2017) and Engardt et al (2017), in which further details and model evaluation can be found. Unfortunately, the threedimensional RCA3 data needed by the EMEP model were not available prior to 1960, but as in Engardt et al (2017) the meteorology of 1900-1959 had to be approximated by assigning random years from 1960 to 1969.…”

Section: Forcing Datasetsmentioning

confidence: 99%

“…It is understood that climate change is likely to affect soil carbon turnover. Increased temperatures increase microbial decomposition activity in the soil and therefore increase carbon losses through higher rates of respiration (Cox et al, 2000;Friedlingstein et al, 2006;Jones et al, 2003). However, some studies have found that O 3 can decrease soil carbon content.…”

Section: Impacts Of O 3 At the Land Surfacementioning

confidence: 99%

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Large but decreasing effect of ozone on the European carbon sink

et al. 2018

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Abstract. The capacity of the terrestrial biosphere to sequester carbon and mitigate climate change is governed by the ability of vegetation to remove emissions of CO 2 through photosynthesis. Tropospheric O 3 , a globally abundant and potent greenhouse gas, is, however, known to damage plants, causing reductions in primary productivity. Despite emission control policies across Europe, background concentrations of tropospheric O 3 have risen significantly over the last decades due to hemispheric-scale increases in O 3 and its precursors. Therefore, plants are exposed to increasing background concentrations, at levels currently causing chronic damage. Studying the impact of O 3 on European vegetation at the regional scale is important for gaining greater understanding of the impact of O 3 on the land carbon sink at large spatial scales. In this work we take a regional approach and update the JULES land surface model using new measurements specifically for European vegetation. Given the importance of stomatal conductance in determining the flux of O 3 into plants, we implement an alternative stomatal closure parameterisation and account for diurnal variations in O 3 concentration in our simulations. We conduct our analysis specifically for the European region to quantify the impact of the interactive effects of tropospheric O 3 and CO 2 on gross primary productivity (GPP) and land carbon storage across Europe. A factorial set of model experiments showed that tropospheric O 3 can suppress terrestrial carbon uptake across Europe over the period 1901 to 2050. By 2050, simulated GPP was reduced by 4 to 9 % due to plant O 3 damage and land carbon storage was reduced by 3 to 7 %. The combined physiological effects of elevated future CO 2 (acting to reduce stomatal opening) and reductions in O 3 concentrations resulted in reduced O 3 damage in the future. This alleviation of O 3 damage by CO 2 -induced stomatal closure was around 1 to 2 % for both land carbon and GPP, depending on plant sensitivity to O 3 . Reduced land carbon storage resulted from diminished soil carbon stocks consistent with the reduction in GPP. Regional variations are identified with larger impacts shown for temperate Europe (GPP reduced by 10 to 20 %) compared to boreal regions (GPP reduced by 2 to 8 %). These results highlight that O 3 damage needs to be considered when predicting GPP and land carbon, and that the effects of O 3 on plant physiology need to be considered in regional land carbon cycle assessments.

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Section: Comparison Of Modelled Estimates Of O 3 Damagementioning

confidence: 56%

Section: Representation Of O 3 Effects In Julesmentioning

confidence: 99%

Section: Forcing Datasetsmentioning

confidence: 99%

Section: Impacts Of O 3 At the Land Surfacementioning

confidence: 99%

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Large but decreasing effect of ozone on the European carbon sink

et al. 2018

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“…There is a paucity of long-term measurements of O 3 deposition over forest vegetation (Mikkelsen et al, 2004;Fares et al, 2010;Rannik et al, 2012) but long-term series are important to study the O 3 dry deposition processes in different climatic and environmental conditions. In addition, new findings regarding O 3 dry deposition schemes must be incorporated in climate models, to assess effects of future climate scenarios on O 3 removal and to predict future vegetative exposure to O 3 under climate change and projected precursor emission reductions (Klingberg et al, 2014;Mills et al, 2016;Zhang et al, 2016;Franz et al, 2017;Sicard et al, 2017). Ozone induced damage may disrupt the hydrological cycle and key biogeochemical cycles, including those of carbon and nitrogen (Schreuder et al, 2001;Paoletti and Grulke, 2010;de Vries et al, 2014;Hoshika et al, 2015;Franz et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Variability of Ozone Deposition Velocity Over a Mixed Suburban Temperate Forest

Neirynck¹,

Verstraeten²

2018

Front. Environ. Sci.

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A 10-year long dataset of half-hourly ozone (O 3 ) fluxes was used to study the variability in deposition velocity (υ d ) over a mixed temperate suburban forest. Average (median) υ d amounted to 0.70 (0.46) cm s −1 , with day-and night-time average (median) of 0.98 (0.73) cm s −1 and 0.46 (0.30) cm s −1 , respectively. It was found that the precipitation form had a marked impact on υ d and the deposition efficiency (υ d/ υ dmax ), with highest values measured when the canopy was dew-wetted or covered with snow. The analysis further evidenced that traffic volume led to increased deposition due to the presence of chemical reactions between O 3 and nitric oxide (NO) above the canopy surface. During the working week, daytime values of υ d, υ d/ υ dmax and the O 3 fluxes (F) were found to be significantly higher than the weekend values, especially during the winter half-year. In a next step, half hourly deposition data were aggregated into day-and night-time monthly values, for a correlative study with measured environmental variables. Monthly average night-time/daytime υ d and υ d/ υ dmax were positively correlated with the relative humidity at the canopy surface (RH(z 0 ′ )) and negatively correlated with the water levels below the ground surface. During the daytime, monthly υ d and υ d/ υ dmax were additionally increased during the working-week when traffic volume was high. There existed, however, substantially different weather conditions, in which unaccounted covariates with a totally different meteorological signature controlled the υ d and F. It was speculated that, among other, biogenic volatile compounds (BVOCs) could have contributed to O 3 quenching in some (spring) months with severe drought stress.

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Climate Change Penalty to Ozone Air Quality: Review of Current Understandings and Knowledge Gaps

Huang

2019

Curr Pollution Rep

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Purpose of Review Climate warming may bear a penalty on future ozone air quality, even in the absence of changes in anthropogenic activities. This penalty has important implications for policy-making, but its quantification involves complex meteorological, chemical, and biological processes and feedbacks that are not well understood. We examined how climatesensitive processes may affect surface ozone, identified key knowledge gaps uncovered by recent studies, and summarized latest assessments of the climate change penalty on ozone air quality. Recent Findings Recent analyses have challenged earlier paradigms on how climate change may affect surface ozone. The widely accepted associations of high ozone events with stagnation and heat waves require re-examination. Emission responses of natural precursors to climate warming may be significantly modulated by CO 2 levels and ecosystem feedbacks, such that the direction of emission changes cannot be robustly determined at this time. Climate variability may drive fluctuations in surface ozone, which has implications for near-term air quality management. Recent studies have generally projected a climate change penalty on ozone air quality, although the magnitudes are smaller than those projected by earlier studies. Summary This review examined the latest understanding on the climate change penalty to surface ozone. Critical uncertainties are associated with the meteorological, chemical, and biological processes linking climate warming and ozone, and many of the known feedbacks are not yet included in models. Further research is needed to examine those processes in order to better quantify the climate change penalty on surface ozone to inform policy-making.

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Development and evaluation of an ozone deposition scheme for coupling to a terrestrial biosphere model

Cited by 24 publications

References 110 publications

Large but decreasing effect of ozone on the European carbon sink

Large but decreasing effect of ozone on the European carbon sink

Variability of Ozone Deposition Velocity Over a Mixed Suburban Temperate Forest

Climate Change Penalty to Ozone Air Quality: Review of Current Understandings and Knowledge Gaps

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