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Author: Alison Mariko Fankhauser Publisher: ISBN: Category : Languages : en Pages :
Book Description
We utilize the current state of knowledge surrounding IEPOX SOA formation in an attempt to elucidate a unifying mechanism. However, model results suggest that significant gaps remain in our understanding of formation and aging processes, especially oligomerization. Finally, we consider microbial consumption of aerosol organics in the atmosphere. Observations of culturable cells in aqueous aerosols and cloud water suggest that they may be actively metabolizing aqueous media while they are airborne, which could have significant impacts on aerosol and cloud properties. Metabolic rates of cells cultured from atmospheric samples are incorporated into GAMMA. While there is a substantial decrease in the concentration of organic species for particles in which cells reside, the overall effect on populations of particles is negligible, and bacterial metabolism is not expected to measurably alter the organic content of the atmosphere.
Author: Alison Mariko Fankhauser Publisher: ISBN: Category : Languages : en Pages :
Book Description
We utilize the current state of knowledge surrounding IEPOX SOA formation in an attempt to elucidate a unifying mechanism. However, model results suggest that significant gaps remain in our understanding of formation and aging processes, especially oligomerization. Finally, we consider microbial consumption of aerosol organics in the atmosphere. Observations of culturable cells in aqueous aerosols and cloud water suggest that they may be actively metabolizing aqueous media while they are airborne, which could have significant impacts on aerosol and cloud properties. Metabolic rates of cells cultured from atmospheric samples are incorporated into GAMMA. While there is a substantial decrease in the concentration of organic species for particles in which cells reside, the overall effect on populations of particles is negligible, and bacterial metabolism is not expected to measurably alter the organic content of the atmosphere.
Author: Ian Barnes Publisher: Springer Science & Business Media ISBN: 9781402042317 Category : Nature Languages : en Pages : 492
Book Description
The book gives in the first instance descriptions of different types of so-called environment chambers or photoreactors used mainly for the simulation and/or investigation of important chemical processes occurring in the atmosphere. The types of reactor described include outdoor and indoor chambers, temperature regulated chambers and glass and Teflon foil chambers The practical use of chambers is demonstrated in contributions by leading scientists in the field of atmospheric chemistry using, in many cases, current results. The types of atmospherically relevant investigations described include the measurement of reactivities, the measurement of radicals, the measurement of photolysis frequencies and products, kinetic and product studies on the oxidation of different types of hydrocarbons by important oxidant species (OH, N03, 03), formation of secondary organic aerosol from hydrocarbon oxidation etc. A special section includes contributions from eastern European countries which highlight some of the environmental research being performed in these countries. An abridged version of a specially commissioned review by the JRC Ispra on the status of environmental research in eastern European countries is also included in this section.
Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
Organic material constitutes about 50% of global atmospheric aerosol mass, and the dominant source of organic aerosol is the oxidation of volatile hydrocarbons, to produce secondary organic aerosol (SOA). Understanding the formation of SOA is crucial to predicting present and future climate effects of atmospheric aerosols. The goal of this program is to significantly increase our understanding of secondary organic aerosol (SOA) formation in the atmosphere. Ambient measurements indicate that the amount of SOA in the atmosphere exceeds that predicted in current models based on existing laboratory chamber data. This would suggest that either the SOA yields measured in laboratory chambers are understated or that all major organic precursors have not been identified. In this research program we are systematically exploring these possibilities.
Author: Jack G Calvert Publisher: Oxford University Press ISBN: 0199710880 Category : Science Languages : en Pages : 1005
Book Description
An international team of eminent atmospheric scientists have prepared Mechanisms of Atmospheric Oxidation of the Alkanes as an authoritative source of information on the role of alkanes in the chemistry of the atmosphere. The book includes the properties of the alkanes and haloalkanes, as well as a comprehensive review and evaluation of the existing literature on the atmospheric chemistry of the alkanes and their major atmospheric oxidation products, and the various approaches now used to model the alkane atmospheric chemistry. Comprehensive coverage is given of both the unsubstituted alkanes and the many haloalkanes. All the existing quality measurements of the rate coefficients for the reactions of OH, Cl, O(3P), NO3, and O3 with the alkanes, the haloalkanes, and their major oxidation products have been reviewed and evaluated. The expert authors then give recommendations of the most reliable kinetic data. They also review the extensive literature on the mechanisms and rates and modes of photodecomposition of the haloalkanes and the products of atmospheric oxidation of the alkanes and the haloalkanes, and make recommendations for future use by atmospheric scientists. The evaluations presented allow an extrapolation of the existing kinetic and photochemical data to those alkanes and haloalkanes that are as yet unstudied. The current book should be of special interest and value to the modelers of atmospheric chemistry as a useful input for development of realistic modules designed to simulate the atmospheric chemistry of the alkanes, their major oxidation products, and their influence on ozone and other trace gases within the troposphere.
Author: Alison Mariko Fankhauser
Author: Alison Mariko Fankhauser
Author: Axel Metzger
Author: Ian Barnes
Author: 
Author: Daniel Grosjean
Author: Emma Louise D'Ambro
Author: Chen Song
Author: Jack G Calvert
Author: Shunsuke Nakao
Author: Kenneth Stephen Docherty