Sentences with phrase «photochemical ozone»

Summertime Photochemical Ozone Formation in Santiago de Chile.

Not exact matches

A detailed ozone model budget analysis was performed with simultaneous observations of O3, HCl, H2O, CH4, NO, and NO2 from the Halogen Occultation Experiment (HALOE) on the Upper Atmosphere Research Satellite (UARS) under conditions with the strongest photochemical control of ozone.

On the contrary, the use of currently recommended photochemical parameters leads to insufficient ozone destruction in the model.

Recently, additional ozone production mechanisms have been proposed to resolve the ozone deficit problem, which arises from greater ozone destruction than production in several photochemical models of the upper stratosphere and lower mesosphere.

VOCs, sunlight and nitrogen oxides react to produce high levels of ozone and photochemical smogs.

Oxidized nitrogen becomes part of photochemical smog and ozone and is a major component of the infamous PM 2.5, particulate matter less than 2.5 microns in diameter that decreases visibility and is harmful when inhaled because it can penetrate deeply into the lungs.

Tracking the ozone lets us track the photochemical processes taking place in the Martian atmosphere.

The findings are timely because the Environmental Protection Agency is developing stricter regulations for ground - level ozone, a primary component in photochemical smog.

«Free oxygen [O2] in the atmosphere is required to form a protective layer of ozone [O3], which can shield methane from photochemical destruction,» Reinhard said.

The ozone season is selected because it is the part of the year with highest temperatures and strongest solar radiation and thus the time when photochemical reactions of ozone precursor gases are most likely to produce high ozone levels (Rice, 2014).

SO2 in the air will also eat ozone and contribute to photochemical smog.

Due to the important role of ozone in driving temperature changes in the stratosphere as well as radiative forcing of surface climate, several different groups have provided databases characterizing the time - varying concentrations of this key gas that can be used to force global climate change simulations (particularly for those models that do not calculate ozone from photochemical principles).

Even so, it has not been regarded as a threat to the ozone layer, because its typical lifetime in the atmosphere before it is broken down in photochemical reactions is only about five months.

This while the photochemical reactions are different but the mechanism involved in warming their atmosphere is similar to our oxygen - ozone system.

Smog consists of: - Ozone (O3) * (formed from the photochemical reaction of Nitrogen dioxide (NO2) + Hydrocarbons)- Particulate matter (PM - 10) * - Sulfur dioxide (SO2) * * Air Pollution is already regulated in the: 1970 Clean Air Act (Amended: 1977, 1990)- Water Pollution is already regulated in the Federal Water Pollution Control Act (Amended: Clean Water Act of 1977, Water Quality Act of 1987)

Joanna Haigh and colleagues now show that these spectral variations — when incorporated into a radiative - photochemical model — lead to decreases in ozone below 45 kilometres and increases above.

Langmann, B., and S.E. Bauer, 2002: On the importance of reliable background concentrations of ozone for regional scale photochemical modelling.

Our results, simulated with a radiative - photochemical model, are consistent with contemporaneous measurements of ozone from the Aura - MLS satellite, although the short time period makes precise attribution to solar effects difficult.

US EPA, 1996: Air quality criteria for ozone and related photochemical oxidants.