TY - JOUR
T1 - Importance of formaldehyde in cloud chemistry
AU - Adewuyi, Yusuf G
AU - Cho, Seog-Yeon
AU - Tsay, Re-Peng
AU - Carmichael, Gregory R.
PY - 1984/1/1
Y1 - 1984/1/1
N2 - A physical-chemical model which is an extension of that of Hong and Carmichael (1983) is used to investigate the role of formaldehyde in cloud chemistry. This model takes into account the mass transfer of SO2, O3, NH3, HNO3, H2O2, CO2, HCl, HCHO, O2, OH and HO2 into cloud droplets and their subsequent chemical reactions. The model is used to assess the importance of S(IV)-HCHO adduct formation, the reduction of H2O2 by HCHO, HCHO-free radical interactions, and the formation of HCOOH in the presence of HCHO in cloud droplets. Illustrative calculations indicate that the presence of HCHO inhibits sulfate production rate in cloud droplets. The direct inhibition of sulfate production rate in cloud water due to nucleophilic addition of HSO-3 to HCHO(aq) to form hydroxymethanesulfonate (HMSA) is generally low for concentrations of HCHO typical of ambient air. However, inhibition of sulfate production due to formaldehyde-free radical interactions in solution can be important. These formaldehyde-free radical reactions can also generate appreciable quantities of formic acid. © 1984.
AB - A physical-chemical model which is an extension of that of Hong and Carmichael (1983) is used to investigate the role of formaldehyde in cloud chemistry. This model takes into account the mass transfer of SO2, O3, NH3, HNO3, H2O2, CO2, HCl, HCHO, O2, OH and HO2 into cloud droplets and their subsequent chemical reactions. The model is used to assess the importance of S(IV)-HCHO adduct formation, the reduction of H2O2 by HCHO, HCHO-free radical interactions, and the formation of HCOOH in the presence of HCHO in cloud droplets. Illustrative calculations indicate that the presence of HCHO inhibits sulfate production rate in cloud droplets. The direct inhibition of sulfate production rate in cloud water due to nucleophilic addition of HSO-3 to HCHO(aq) to form hydroxymethanesulfonate (HMSA) is generally low for concentrations of HCHO typical of ambient air. However, inhibition of sulfate production due to formaldehyde-free radical interactions in solution can be important. These formaldehyde-free radical reactions can also generate appreciable quantities of formic acid. © 1984.
KW - cloud chemistry
KW - Formaldehyde
KW - formaldehyde-free radical interactions
KW - formic acid
KW - hydroxymethanesulfonate
KW - inhibition
KW - sulfate production
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U2 - 10.1016/0004-6981(84)90011-8
DO - 10.1016/0004-6981(84)90011-8
M3 - Article
SN - 0004-6981
VL - 18
SP - 2413
EP - 2420
JO - Atmospheric Environment (1967)
JF - Atmospheric Environment (1967)
IS - 11
ER -