Results 191 to 200 of about 162,471 (236)
Some of the next articles are maybe not open access.
Chemosphere - Global Change Science, 2000
Anthropogenic emissions of chemical reactive trace gases have substantially altered the composition of the troposphere. These perturbations have caused tropospheric O3 increases, in particular in the Northern Hemisphere. It remains, however, difficult to accurately establish O3 trends throughout the troposphere because the number of sites where surface
Guicherit, R., Roemer, M.
openaire +2 more sources
Anthropogenic emissions of chemical reactive trace gases have substantially altered the composition of the troposphere. These perturbations have caused tropospheric O3 increases, in particular in the Northern Hemisphere. It remains, however, difficult to accurately establish O3 trends throughout the troposphere because the number of sites where surface
Guicherit, R., Roemer, M.
openaire +2 more sources
Photochemistry of tropospheric ozone
Journal of Geophysical Research, 1977A photochemical equilibrium model of minor constituent chemistry in the troposphere was constructed to investigate the photochemistry of tropospheric ozone. We find that photochemical production must be supplemented by additional sources to account for observed ozone levels in clean air, while photochemical loss is more important than surface ...
Richard W. Stewart +2 more
openaire +1 more source
Tropospheric Ozone and the Greenhouse Effect
1994Global changes in emissions of the non-greenhouse gases nitrogen oxides (N0x), Volatile Organic Compounds (VOCs) and carbon monoxide (CO), affect the concentrations of greenhouse gases, in particular of ozone. The chemical mechanisms causing these changes were investigated with a global two-dimensional model, and the greenhouse effect of tropospheric ...
Roemer, M.G.M. +2 more
openaire +2 more sources
On the origin of tropospheric ozone
Journal of Geophysical Research: Oceans, 1980The effects of NOx (NO + NO2) intrusion from the stratosphere on photochemical ozone production in the upper troposphere are investigated. Using the currently accepted reaction rate coefficients, we find that this upper tropospheric ozone source may be significantly larger than the direct injection of ozone from the stratosphere.
S. C. Liu +4 more
openaire +1 more source
The origin of ozone in the troposphere
Nature, 1978Examination of the distribution of tropospheric ozone indicates that surface destruction in the Northern Hemisphere (NH) should be about three times larger than in the Southern Hemisphere (SH). If, according to the traditional understanding of ozone, this species were a passive tracer in the troposphere, a threefold larger flux out of the stratosphere ...
Jack Fishman, Paul J. Crutzen
openaire +1 more source
Simplified kinetics of tropospheric ozone
Ecological Modelling, 1996Abstract Though air quality modelling has reached a stage of extreme complexity, this simple model is intended to demonstrate how the basic mechanism of tropospheric ozone can be explained with a very simple dynamics, if the model is adjusted to the field situation with the aid of an efficient parameter calibration algorithm.
openaire +2 more sources
2003
Tropospheric ozone in Croatia has been measured on various locations since 1975. These locations includes sites as Puntijarka (where ozone is measured continuously since 1989) and the town of Zagreb, Split, Šibenik, Zadar, Dubrovnik and Osijek. Short measurements campaigns took place along the Adriatic coast at Rovinj, Omišalj, Mali Lošinj, Zavižan, Iž,
Butković, Vjera +4 more
openaire +3 more sources
Tropospheric ozone in Croatia has been measured on various locations since 1975. These locations includes sites as Puntijarka (where ozone is measured continuously since 1989) and the town of Zagreb, Split, Šibenik, Zadar, Dubrovnik and Osijek. Short measurements campaigns took place along the Adriatic coast at Rovinj, Omišalj, Mali Lošinj, Zavižan, Iž,
Butković, Vjera +4 more
openaire +3 more sources
Tropospheric Ozone: The Dynamics of Human Exposure
Toxicology and Industrial Health, 1989The conditions in the ambient atmosphere conducive to ozone exposure are examined, and placed into a context of the time arid locations where individuals would be expected to be affected by high ozone. This is done for both 1 h and 8 h averaging times.
P J, Lioy, R V, Dyba
openaire +2 more sources
Journal of Geophysical Research: Oceans, 1983
The small‐scale vertical variability of tropospheric O3 and CO is examined from a set of simultaneous measurements obtained in July and August 1974, between 55°S and 67°N. From this set of vertical profiles, it is noted that many of the fluctuations are coincident in both species, and a method is presented that quantifies the correlation between the ...
Jack Fishman, Wolfgang Seiler
openaire +1 more source
The small‐scale vertical variability of tropospheric O3 and CO is examined from a set of simultaneous measurements obtained in July and August 1974, between 55°S and 67°N. From this set of vertical profiles, it is noted that many of the fluctuations are coincident in both species, and a method is presented that quantifies the correlation between the ...
Jack Fishman, Wolfgang Seiler
openaire +1 more source
QSAR Prediction of Ozone Tropospheric Degradation
QSAR & Combinatorial Science, 2003AbstractThe lifetime of organic chemicals in the atmosphere can be calculated from a knowledge of the rate constant of their reaction with free radicals (OH., NO3.) and O3. The rate constant for the tropospheric degradation of 125 organic compounds by reaction with ozone, the least widely and successfully modelled degradation process, is predicted here
GRAMATICA, PAOLA +2 more
openaire +1 more source