The influence of temperature on ozone production under varying NOx conditions - a modelling study

被引:173
作者
Coates, Jane [1 ]
Mar, Kathleen A. [1 ]
Ojha, Narendra [2 ]
Butler, Tim M. [1 ]
机构
[1] Inst Adv Sustainabil Studies, Potsdam, Germany
[2] Max Planck Inst Chem, Atmospher Chem Dept, Mainz, Germany
关键词
VOLATILE ORGANIC-COMPOUNDS; MASTER CHEMICAL MECHANISM; MCM V3 PART; AIR-QUALITY; ATMOSPHERIC CHEMISTRY; TROPOSPHERIC DEGRADATION; CLIMATE-CHANGE; PHOTOCHEMICAL OZONE; URBAN ATMOSPHERE; SURFACE OZONE;
D O I
10.5194/acp-16-11601-2016
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Surface ozone is a secondary air pollutant produced during the atmospheric photochemical degradation of emitted volatile organic compounds (VOCs) in the presence of sunlight and nitrogen oxides (NOx). Temperature directly influences ozone production through speeding up the rates of chemical reactions and increasing the emissions of VOCs, such as isoprene, from vegetation. In this study, we used an idealised box model with different chemical mechanisms (Master Chemical Mechanism, MCMv3.2; Common Representative Intermediates, CRIv2; Model for OZone and Related Chemical Tracers, MOZART-4; Regional Acid Deposition Model, RADM2; Carbon Bond Mechanism, CB05) to examine the non-linear relationship between ozone, NOx and temperature, and we compared this to previous observational studies. Under high-NOx conditions, an increase in ozone from 20 to 40aEuro-A degrees C of up to 20aEuro-ppbv was due to faster reaction rates, while increased isoprene emissions added up to a further 11aEuro-ppbv of ozone. The largest inter-mechanism differences were obtained at high temperatures and high-NOx emissions. CB05 and RADM2 simulated more NOx-sensitive chemistry than MCMv3.2, CRIv2 and MOZART-4, which could lead to different mitigation strategies being proposed depending on the chemical mechanism. The increased oxidation rate of emitted VOC with temperature controlled the rate of O-x production; the net influence of peroxy nitrates increased net O-x production per molecule of emitted VOC oxidised. The rate of increase in ozone mixing ratios with temperature from our box model simulations was about half the rate of increase in ozone with temperature observed over central Europe or simulated by a regional chemistry transport model. Modifying the box model set-up to approximate stagnant meteorological conditions increased the rate of increase of ozone with temperature as the accumulation of oxidants enhanced ozone production through the increased production of peroxy radicals from the secondary degradation of emitted VOCs. The box model simulations approximating stagnant conditions and the maximal ozone production chemical regime reproduced the 2aEuro-ppbv increase in ozone per degree Celsius from the observational and regional model data over central Europe. The simulated ozone-temperature relationship was more sensitive to mixing than the choice of chemical mechanism. Our analysis suggests that reductions in NOx emissions would be required to offset the additional ozone production due to an increase in temperature in the future.
引用
收藏
页码:11601 / 11615
页数:15
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