Journal ArticleDOI
The photochemistry of a remote marine stratiform cloud
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TLDR
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
Accommodation coefficient of gaseous NO2 on water surfaces
J. H. Lee,I.N. Tang +1 more
TL;DR: In this article, experimental results are reported on the interfacial mass transfer of gaseous NO2 into aqueous phase, and the accommodation coefficient for NO2, α = (6.3 ± 0.7) × 10−4 at 0°C, has been measured using a stop-flow multiple-pass laser absorption technique.
Journal ArticleDOI
Budget and export of anthropogenic SOx from East Asia during continental outflow conditions
TL;DR: In this paper, the authors examined the budget and export of anthropogenic SOx (SO2 and sulfate aerosol) emitted from East Asia during the late winter/early spring when continental outflow conditions dominate.
Journal ArticleDOI
Cloud chemistry effects on tropospheric photooxidants in polluted atmosphere — Model results
D. Möller,G. Mauersberger +1 more
TL;DR: In this paper, a mathematical model is presented to analyze the influence of the liquid phase on photooxidant formation and destruction for different gaseous SO2 concentrations with and without consideration of organic aqueous phase chemistry.
Journal ArticleDOI
Estimates of nitrate formation in rain and snow systems
TL;DR: In this article, the authors derived approximate expressions for estimating NOy species concentrations and nitrate formation in storm systems using gas phase and heterogeneous chemical reaction mechanisms and conservation equations for chemical species and hydrometeors (cloud droplets, raindrops, and snowflakes).
Journal ArticleDOI
Temperature dependent near-UV molar absorptivities of aliphatic aldehydes and ketones in aqueous solution
TL;DR: In this paper, temperature dependent molar absorptivities are reported for acetone, 2-butanone and aldehydes in aqueous solution at eight temperatures in the range 65-695°C for wavelengths greater than 200 nm, a spectral resolution of 20 nm, and a spacing of 25 nm.
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.