Vertical ozone distribution on a global scale

Dütsch, H. U.

doi:10.1007/bf01636904

Cited by 111 publications

(43 citation statements)

References 4 publications

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“…For carbonaceous aerosols, optical properties were extracted from the biomass-burning study of Reid et al (2005), considering the hygroscopic growth effect on radiation following Kasten (1969). No photochemistry option is included in RegCM; the zonally averaged atmospheric ozone profile is prescribed following the results of Dütsch (1978).…”

Section: Model Regcmmentioning

confidence: 99%

Interactive coupling of a regional climate model and a chemical transport model: evaluation and preliminary results on ozone and aerosol feedback

Huszár¹,

Mikšovský²,

Pišoft³

et al. 2012

Clim. Res.

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This study presents an interactive coupling system of the regional climate model RegCM3 and the chemistry transport model CAMx, called RegCMCAMx. This system provides an advancement from offline coupling methods already in use. In RegCMCAMx, the radiative effects of tropospheric ozone, sulfates and black and organic carbon were considered. A series of annual sensitivity simulations were carried out for the year 2005 over a European domain, where ozone and/or aerosols were interactively coupled (taking their radiative feedbacks into account). The simulated concentrations of ozone, nitrogen dioxide, sulfur dioxide, sulfate and carbonaceous aerosol were validated against surface measurements. The coupling was evaluated by simulating 2 m temperature as well. The model satisfactorily reproduced near-surface ozone, especially in summer, and made reasonable predictions for monthly sulfate aerosol concentrations. Deficiencies were identified in simulating nitrogen (underprediction), sulfur oxides (overprediction) and carbonaceous aerosols (underprediction). The performance of the coupling system compared to non-coupled data was analyzed, and significant improvement of the model was found in terms of reproducing 2 m temperature, mainly for interactively coupled ozone. The short-term climate response of interactively coupled chemistry/aerosol was analyzed for the first time by this coupling model as well. The seasonally averaged temperature perturbation caused by coupled ozone/aerosols ranged from −1.5 to +1.5°C, not only near the surface but also at higher altitudes. Despite expectations, the surface radiative forcing due to aerosols did not correlate with the induced temperature changes, reflecting the complexity of the processes when ozone and/or aerosols perturb the overall dynamics of the atmosphere. The limitations of the newly established coupling system and the potential for future development are discussed.

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Section: Model Regcmmentioning

confidence: 99%

Interactive coupling of a regional climate model and a chemical transport model: evaluation and preliminary results on ozone and aerosol feedback

Huszár¹,

Mikšovský²,

Pišoft³

et al. 2012

Clim. Res.

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“…Within the model domain, initial ozone concentrations were taken from climatological data developed by Dutsch [1978]. Because the top of the model is fixed roughly at the 9 mbar level, the ozone column abundance above this height must be specified for photochemical calculations.…”

Section: Radiation Componentmentioning

confidence: 99%

Aerosol‐induced chemical perturbations of stratospheric ozone: Three‐dimensional simulations and analysis of mechanisms

Zhao¹,

Turco²,

Kao³

et al. 1997

J. Geophys. Res.

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Abstract. An atmospheric general circulation model is coupled with a stratospheric photochemical model to simulate the chemical/dynamical perturbations associated with background and volcanically perturbed aerosols in the lower stratosphere. The present work focuses on short-term anomalies at middle and high latitudes in the northern hemisphere, where large ozone depletions have been observed in late winter and early spring, particularly following the eruption of Mount Pinatubo. Five fully coupled simulations are analyzed, corresponding to a control case with only gas phase chemistry, and cases including heterogeneous chemistry on background aerosols, on E1 Chich6n-type, and on Pinatubo-type aerosols. It is found that heterogeneous reactions occurring on sulfate aerosols (background or postvolcanic) can strongly perturb the chemical partitioning in the lower stratosphere, leading to significant ozone depletion through enhanced chlorine, bromine, and odd-hydrogen catalytic cycles. In the Arctic lower stratosphere, the maximum zonal and March monthly mean local ozone reductions (with respect to the control case) can exceed 15% for the background aerosol case, 40% for the E1 Chich6n case, and 50% for the Pinatubo case. The corresponding zonal mean total column ozone decreases are roughly 5% and 15% for the background and volcanic aerosol cases, respectively. In the most extreme case tested (post-Pinatubo), a large ozone depletion below 30 mbar is offset to some extent by an ozone increase above that level. The results of a sensitivity study (in which the aerosols are distributed closer to the tropics, as might occur early after an eruption at low latitude) lead to relatively small total ozone depletions at northern high latitudes, and small ozone increases in the tropical lower stratosphere. The reduced impact on total ozone at high latitudes is associated both with local ozone increases above 30 mbar and with poleward transport of enhanced ozone from the tropical lower stratosphere. The ozone increase at low latitudes is the net result of compensating changes in the catalytic destruction cycles involving odd-nitrogen and chlorine species activated by heterogeneous processes at the low temperatures and abundant sunlight found near the tropical tropopause. Our simulations indicate that ozone variations triggered by volcanic injections of aerosols depend on the global distribution as well as the abundance of the particles and their evolution over time, and on the initial dynamical-radiative-chemical state of the atmosphere, which itself exhibits large seasonal and interannual variability.

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“…The ozone distributes in the lower stratosphere much more in spring than in autumn (e. g., Dutsch, 1978). This is a consequence of ozone transport from the upper and northern stratosphere due to the planetary wave.…”

Section: Seasonal Behaviormentioning

confidence: 99%