OH formation by HONO photolysis during the BERLIOZ experiment

OH formation by HONO photolysis during the BERLIOZ experiment

The photolysis of nitrous acid (HONO) in the early morning hours is an important source of OH radicals, the most important daytime oxidizing species. Although the importance of this mechanism has been recognized for many years, no accurate quantification of this OH source is available, and the role...

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Veröffentlicht in:Journal of Geophysical Research. D. Atmospheres 2003-02, Vol.108 (D4), p.PHO 3-1-PHO 3-17
Hauptverfasser: Alicke, B., Geyer, A., Hofzumahaus, A., Holland, F., Konrad, S., Pätz, H. W., Schäfer, J., Stutz, J., Volz-Thomas, A., Platt, U.
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HCHO
HONO
ozone
photochemistry
photolysis
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container_end_page PHO 3-17
container_issue D4
container_start_page PHO 3-1
container_title Journal of Geophysical Research. D. Atmospheres
container_volume 108
creator Alicke, B.
Geyer, A.
Hofzumahaus, A.
Holland, F.
Konrad, S.
Pätz, H. W.
Schäfer, J.
Stutz, J.
Volz-Thomas, A.
Platt, U.
description The photolysis of nitrous acid (HONO) in the early morning hours is an important source of OH radicals, the most important daytime oxidizing species. Although the importance of this mechanism has been recognized for many years, no accurate quantification of this OH source is available, and the role of HONO photolysis is often underestimated. We present measurements of HONO and its precursor NO2 by Differential Optical Absorption Spectroscopy (DOAS) during the Berliner Ozonexperiment (BERLIOZ) field campaign in July/August 1998 at Pabstthum near Berlin, Germany. HONO concentrations, formation rates, and simultaneously measured HONO photolysis frequencies are used to calculate the total amount of OH formed by HONO photolysis during a full diurnal cycle. A comparison with the OH formation by photolysis of O3 and HCHO and by the reaction of alkenes with ozone shows that HONO photolysis contributed up to 20% of the total OH formed in a 24 hour period during this campaign. In the morning hours, HONO photolysis was by far the most important OH source during BERLIOZ.
doi_str_mv 10.1029/2001JD000579
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source Wiley Online Library; Wiley Online Library Journals Frontfile Complete; Wiley-Blackwell AGU Digital Archive; Alma/SFX Local Collection
subjects HCHO
HONO
ozone
photochemistry
photolysis
title OH formation by HONO photolysis during the BERLIOZ experiment
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