Remove maintenance message An airborne study of ozone concentrations and fluxes in the lower layers of the atmosphere was conducted over the Central African Republic (CAR) and northern Congo in November/December 1996, within the framework of the Experiment of Regional Sources and Sinks of Oxidants (EXPRESSO). The daily O3 increase was comprised of two approximately equal portions: one due to downmixing of O3 from aloft (0600–1000 h), and the other due to photochemistry and possibly some further downmixing (1000–1400 h). Since the O3 loss-rate could be parameterized equally well by either zero- or first-order rate laws, we could not distinguish between the two mechanisms. An airborne study of ozone concentrations and fluxes in the lower layers of the atmosphere was conducted over the Central African Republic (CAR) and northern Congo in November/December 1996, within the framework of the Experiment of Regional Sources and Sinks of Oxidants (EXPRESSO). Consequently, it is concluded that O3 loss was controlled by surface deposition with deposition velocities ranging from 0.06 to 0.34cms−1 at the three sites. Ozone is also an important constituent of the stratosphere, where the ozone layer exists which is located between 10 and 50 kilometers above the earths surface. Copyright © 1984 Published by Elsevier Ltd. https://doi.org/10.1016/0004-6981(84)90036-2. We use cookies to help provide and enhance our service and tailor content and ads. By continuing you agree to the use of cookies. We use cookies to help provide and enhance our service and tailor content and ads. Based on data collected at rural sites in South Dakota, Louisiana and Virginia during the summers of 1978–1980, the factors controlling the diurnal behavior of O 3 near the surface were determined. Even assuming that all of the O3 increase during the 1000–1400 h period was due to local photochemistry, only very small amounts of O3 were formed i.e. Ozone (O 3) is a trace gas of the troposphere, with an average concentration of 20–30 parts per billion by volume (ppbv), with close to 100 ppbv in polluted areas. Comparing the ambient data with the bag irradiation and modeling results, it was concluded that rural photochemistry was not controlled exclusively by NOx, but depended on hydrocarbons as well. Al.5.2 Sinks 38 Al.5.3 Sources 38 AL6 Ozone 39 A 1.6.1 Observed Trends in Total Column Ozone 39 A 1.6.2 Observed Trends in the Vertical Distribution of Ozone 39 A1.6.3 Future Levels of Stratospheric Ozone 40 A1.7 Tropospheric Ozone Precursors: Carbon Monoxide, Non-Methane Hydrocarbons and Nitrogen Oxides 40 A 1.7.1 Trends 40 The O3 decrease (1800 to 0600 h) generally occurred while nocturnal inversions isolated the lower 50 m of the atmosphere from the air aloft. about 6 ppb of O3 per ppb of nitrogen oxides (NOx). At all three sites, the diurnal O3 profile consisted of a period of O3 increase from sunrise until mid-afternoon, and a period of O3 decrease from late afternoon until sunrise. Comparing the ambient data with the bag irradiation and modeling results, it was concluded that rural photochemistry was not controlled exclusively by NOx, but depended on hydrocarbons as well. An airborne study of ozone concentrations and fluxes in the lower layers of the atmosphere was conducted over the Central African Republic (CAR) and northern Congo in November/December 1996, within the framework of the Experiment of Regional Sources and Sinks of Oxidants (EXPRESSO). By continuing you agree to the use of cookies. The occurrence of this gas is in the upper atmosphere of Earth as well as on the ground level. About Cookies, including instructions on how to turn off cookies if you wish to do so. Ozone has full FDA-approval for direct-food contact. Ozone is made up of a combination of three oxygen atoms. Copyright © 2020 Elsevier B.V. or its licensors or contributors. Both bag irradiation and photochemical modeling studies suggested similar, but slightly higher O3 formation. The occurrence of this gas is in the upper atmosphere of Earth as well as on the ground level. At all three sites, the diurnal O 3 profile consisted of a period of O 3 increase from sunrise until mid-afternoon, and a period of O 3 decrease from late afternoon until sunrise. The O3 decrease (1800 to 0600 h) generally occurred while nocturnal inversions isolated the lower 50 m of the atmosphere from the air aloft. The stratospheric ozone is a naturally occurring atmospheric gas which forms the ozone layer that protects the Earth from catastrophic ultraviolet rays produced by the sun. Based on data collected at rural sites in South Dakota, Louisiana and Virginia during the summers of 1978–1980, the factors controlling the diurnal behavior of O3 near the surface were determined. By continuing to browse this site you agree to us using cookies as described in About Cookies..
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