نتایج جستجو برای: tropospheric ozone
تعداد نتایج: 25310 فیلتر نتایج به سال:
We analyze MOZAIC ozone observations recorded over Equatorial Africa, from April 1997 to March 2003 to give the first ozone climatology of this region. The monthly mean vertical profiles have been systematically analyzed with monthly mean ECMWF data using a Lagrangian-model (LAGRANTO). We assess the roles played by the dy-5 namical features of Equatorial Africa and the intense biomass burning s...
Ozone is produced in the troposphere by gas-phase oxidation of hydrocarbons and CO catalyzed by hydrogen oxide radicals (HOx ≡ OH + H + peroxy radicals) and nitrogen oxide radicals (NOx ≡ NO+NO2). Heterogeneous chemistry involving reactions in aerosol particles and cloud droplets may affect O3 concentrations in a number of ways including production and loss of HOx and NOx, direct loss of O3, an...
Abstract. The evolution of tropospheric ozone from 1850 to 2100 has been studied using data Phase 6 the Coupled Model Intercomparison Project (CMIP6). We evaluate long-term changes coupled atmosphere–ocean chemistry–climate models, focusing on CMIP Historical and ScenarioMIP ssp370 experiments, for which detailed tropospheric-ozone diagnostics were archived. model ensemble evaluated against a s...
Global column ozone and tropospheric temperature observations made by groundbased (1964–2004) and satellite-borne (1978–2004) instrumentation are analyzed. Ozone and temperature fluctuations in small time-intervals are found to be positively correlated to those in larger time-intervals in a power-law fashion. For temperature, the 5 exponent of this dependence is larger in the mid-latitudes than...
Most of the short-lived biogenic and anthropogenic chemical species that are emitted into the atmosphere break down efficiently by reaction with OH and do not reach the stratosphere. Here we show the existence of a pronounced minimum in the tropospheric column of ozone over the West Pacific, the main source region for stratospheric air, and suggest a corresponding minimum of the tropospheric co...
It is well-understood that reductions in air quality play a significant role in both environmental and human health. Interactions between ozone depletion and global climate change will significantly alter atmospheric chemistry which, in turn, will cause changes in concentrations of natural and human-made gases and aerosols. Models predict that tropospheric ozone near the surface will increase g...
Ozone pollution in the Southeast US involves complex chemistry driven by emissions of anthropogenic nitrogen oxide radicals (NOx ≡ NO + NO2) and biogenic isoprene. Model estimates of surface ozone concentrations tend to be biased high in the region and this is of concern for designing effective emission control strategies to meet air quality standards. We use detailed chemical observations from...
An unusual stratospheric ozone decrease linked to isentropic air-mass transport as observed over Irene (25.5 S, 28.1 E) in mid-May 2002 N. Semane, H. Bencherif, B. Morel, A. Hauchecorne, and R. D. Diab Centre National de Recherches Météorologiques, Direction de la Météorologie Nationale, Casablanca, Morocco Laboratoire de Physique de l’Atmosphère, UMR CNRS 8105, Université de La Réunion, Reunio...
[1] We explore the extent to which chemistry-aerosol-climate coupling influences predictions of future ozone and aerosols as well as future climate using the Goddard Institute for Space Studies (GISS) general circulation model II’ with on-line simulation of tropospheric ozone-NOx-hydrocarbon chemistry and sulfate, nitrate, ammonium, black carbon, primary organic carbon, and secondary organic ca...
Tropospheric ozone concentration is increasing and represents a threat to single plants and whole ecosystems. The deleterious ozone effects mainly occur when (i) ozone concentration in the air builds up; (ii) the pollutant enters the leaf through stomatal uptake, and (iii) ozone-produced reactive oxygen species are not efficiently scavenged by leaf antioxidants and then oxidize leaf tissues. Th...
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