FastFind »   Lastname: doi:10.1029/ Year: | Advanced Search  

AGU: Geophysical Research Letters

 

Index Terms

  • Atmospheric Composition and Structure: Chemical kinetic and photochemical properties
  • Atmospheric Composition and Structure: Aerosols and particles

Abstract

The loss of NO2, HNO3, NO3/N2O5, and HO2/HOONO2 on soot aerosol: A chamber and modeling study

H. Saathoff

Institut für Meteorologie und Klimaforschung, Forschungszentrum Karlsruhe, POB 3640, D‐76021 Karlsruhe, Germany

K.‐H. Naumann

Institut für Meteorologie und Klimaforschung, Forschungszentrum Karlsruhe, POB 3640, D‐76021 Karlsruhe, Germany

N. Riemer

Institut für Meteorologie und Klimaforschung, Forschungszentrum Karlsruhe, POB 3640, D‐76021 Karlsruhe, Germany

S. Kamm

Institut für Meteorologie und Klimaforschung, Forschungszentrum Karlsruhe, POB 3640, D‐76021 Karlsruhe, Germany

O. Möhler

Institut für Meteorologie und Klimaforschung, Forschungszentrum Karlsruhe, POB 3640, D‐76021 Karlsruhe, Germany

U. Schurath

Institut für Meteorologie und Klimaforschung, Forschungszentrum Karlsruhe, POB 3640, D‐76021 Karlsruhe, Germany

H. Vogel

Institut für Meteorologie und Klimaforschung, Forschungszentrum Karlsruhe, POB 3640, D‐76021 Karlsruhe, Germany

B. Vogel

Institut für Meteorologie und Klimaforschung, Forschungszentrum Karlsruhe, POB 3640, D‐76021 Karlsruhe, Germany

The heterogeneous loss of NO2, HNO3, NO3/N2O5, and HO2/HO2NO2 on soot aerosol was investigated in a large aerosol chamber for interaction times of up to several days. By fitting a detailed model to the measured time profiles of the trace gas concentrations in the presence / absence of soot aerosol, the following reaction probabilities have been deduced at 294 K and < 10 ppm H2O (in parentheses: at 50% r.h.):γ(NO2) ≤ 4× 10−8; γ(HNO3→NO2) ≤ 3× 10−7; γ(NO3) ≤ 3 × 10−4 (≤10−3); γ(N2O5, hydrolysis)=(4±2) ×10−5 ((2±1 ) × 10−4); γ(N2O5, reduction)=(4±2) × 10−6; γ(HO2≤ 10−2; γ(HO2NO2) ≤ 10−5. These results were adopted in a series of box model calculations for four‐day summer smog episodes, probing a wide range of NO emission rates. The 2nd day ozone maxima were reduced up to 10% in the presence of 20 µg m−3 soot aerosol, mainly due to the heterogeneous loss of HO2.

Received 13 November 2000; accepted 19 February 2001; .

Citation: Saathoff, H., K.‐H. Naumann, N. Riemer, S. Kamm, O. Möhler, U. Schurath, H. Vogel, and B. Vogel (2001), The loss of NO2, HNO3, NO3/N2O5, and HO2/HOONO2 on soot aerosol: A chamber and modeling study, Geophys. Res. Lett., 28(10), 1957–1960.

Cited By

Please wait one moment ...