Journal ArticleDOI
The photochemistry of a remote marine stratiform cloud
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In this article, coupled gas and aqueous-phase photochemistry of a stratiform cloud in a remote region of the marine atmosphere is investigated with a time-dependent box model.Abstract:
The coupled gas- and aqueous-phase photochemistry of a stratiform cloud in a remote region of the marine atmosphere is investigated with a time-dependent box model. Both scavenging of ambient acidic aerosols and gases as well as aqueous-phase chemical reactions within droplets are found to be important sources of acidity to cloud water and can lead to pH levels in cloud water in the remote marine atmosphere well below 5.6. The major sources of acidity via aqueous-phase chemical reactions are the generation of sulfuric acid from dissolved SO2 and the generation of formic acid from dissolved formaldehyde. In both cases, aqueous-phase free radicals can play a significant role either directly by oxidizing dissolved SO2 and HCHO or indirectly by producing the aqueous-phase oxidant H2O2. The rate of SO2 conversion to sulfuric acid is sensitive to a variety of parameters including the accommodation or sticking coefficient for SO2, H2O2, HO2, and OH, the liquid water content, and the ambient levels of SO2, HNO3, and other acidic or basic gases. Because high levels of SO2 tend to deplete cloud water of H2O3, the possibility exists that the pH of precipitation in polluted regions will respond nonlinearly to reduced SO2 emissions.read more
Citations
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Journal ArticleDOI
A historical record of formate and acetate from a high‐elevation Alpine glacier: Implications for their natural versus anthropogenic budgets at the European scale
TL;DR: In this article, high-resolution records of formate and acetate from a Col du Dome (CDD, 4250 m elevation, French Alps) ice core were used to investigate the impact of man-made activities on the midtropospheric levels of these species over Europe since 1925.
Journal ArticleDOI
Scavenging of gaseous mercury by acidic snow at Kuujjuarapik, Northern Québec.
TL;DR: Findings suggest that snow may also play a role in enhancing deposition of mercury, as gas phase oxidation by halogen-containing radicals leading to abrupt atmospheric mercury depletion concurrent with ozone depletion.
Book ChapterDOI
Pollutant Wet Deposition Mechanisms in Precipitation and Fog Water
TL;DR: In this article, the relative importance of each deposition pathway depends on the frequency of occurrence of precipitation or fog, the magnitude of the event and the efficiency of pollutant removal by each mechanism.
Book ChapterDOI
Fundamentals of Atmospheric Modeling: Sedimentation, dry deposition, and air–sea exchange
Journal ArticleDOI
Modeling atmospheric mineral aerosol chemistry to predict heterogeneous photooxidation of SO 2
TL;DR: In this paper, the photocatalytic rate constant was derived from the integration of the combinational product of the dust absorbance spectrum and wave-dependent actinic flux for the full range of wavelengths of the light source.
References
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CRC Handbook of Chemistry and Physics
TL;DR: CRC handbook of chemistry and physics, CRC Handbook of Chemistry and Physics, CRC handbook as discussed by the authors, CRC Handbook for Chemistry and Physiology, CRC Handbook for Physics,
Chemical kinetics and photochemical data for use in stratospheric modeling
W. B. Demore,J. J. Margitan,Mario J. Molina,R. T. Watson,D. M. Golden,R. F. Hampson,Michael J. Kurylo,Carleton J. Howard,A. R. Ravishankara +8 more
TL;DR: As part of a series of evaluated sets, rate constants and photochemical cross sections compiled by the NASA Panel for Data Evaluation are provided in this article, with particular emphasis on the ozone layer and its possible perturbation by anthropogenic and natural phenomena.
Journal ArticleDOI
Tropospheric chemistry: A global perspective
TL;DR: A model for the photochemistry of the global troposphere constrained by observed concentrations of H2O, O3, CO, CH4, NO, NO2, and HNO3 is presented in this paper.
Book
Selected values of chemical thermodynamic properties
TL;DR: The Selected Values of Chemical Thermodynamic Properties as mentioned in this paper, published by the National Bureau of Standards (NBS) in 1952, is a seminal work in the field of thermodynamics.