Diurnal variability, photochemical production and loss processes of hydrogen peroxide in the boundary layer over Europe

Publikationstyp:
Zeitschriftenaufsatz
Metadaten:
Autoren
  • Horst Fischer
  • Raoul Axinte
  • Heiko Bozem
  • John N Crowley
  • Cheryl Ernest
  • Stefan Gilge
  • Sascha Hafermann
  • Hartwig Harder
  • Korbinian Hens
  • Ruud HH Janssen
  • Rainer Koenigstedt
  • Dagmar Kubistin
  • Chinmay Mallik
  • Monica Martinez
  • Anna Novelli
  • Uwe Parchatka
  • Christian Plass-Duelmer
  • Andrea Pozzer
  • Eric Regelin
  • Andreas Reiffs
  • Torsten Schmidt
  • Jan Schuladen
  • Jos Lelieveld
Autoren-URL
https://www.webofscience.com/api/gateway?GWVersion=2&SrcApp=fis-test-1&SrcAuth=WosAPI&KeyUT=WOS:000488022200003&DestLinkType=FullRecord&DestApp=WOS_CPL
DOI
10.5194/acp-19-11953-2019
eISSN
1680-7324
Externe Identifier
  • Clarivate Analytics Document Solution ID: JA7KO
ISSN
1680-7316
Ausgabe der Veröffentlichung
18
Zeitschrift
ATMOSPHERIC CHEMISTRY AND PHYSICS
Paginierung
11953 - 11968
Datum der Veröffentlichung
2019
Status
Published
Titel
Diurnal variability, photochemical production and loss processes of hydrogen peroxide in the boundary layer over Europe
Sub types
  • Article
Ausgabe der Zeitschrift
19

Datenquelle: Web of Science (Lite)

Andere Metadatenquellen:
Abstract
<jats:p>Abstract. Hydrogen peroxide (H2O2) plays a significant role in the oxidizing capacity of the atmosphere. It is an efficient oxidant in the liquid phase and serves as a temporary reservoir for the hydroxyl radical (OH), the most important oxidizing agent in the gas phase. Due to its high solubility, removal of H2O2 due to wet and dry deposition is efficient, being a sink of HOx (OH+HO2) radicals. In the continental boundary layer, the H2O2 budget is controlled by photochemistry, transport and deposition processes. Here we use in situ observations of H2O2 and account for chemical source and removal mechanisms to study the interplay between these processes. The data were obtained during five ground-based field campaigns across Europe from 2008 to 2014 and bring together observations in a boreal forest, two mountainous sites in Germany, and coastal sites in Spain and Cyprus. Most campaigns took place in the summer, while the measurements in the south-west of Spain took place in early winter. Diel variations in H2O2 are strongly site-dependent and indicate a significant altitude dependence. While boundary-layer mixing ratios of H2O2 at low-level sites show classical diel cycles with the lowest values in the early morning and maxima around local noon, diel profiles are reversed on mountainous sites due to transport from the nocturnal residual layer and the free troposphere. The concentration of hydrogen peroxide is largely governed by its main precursor, the hydroperoxy radical (HO2), and shows significant anti-correlation with nitrogen oxides (NOx) that remove HO2. A budget calculation indicates that in all campaigns, the noontime photochemical production rate through the self-reaction of HO2 radicals was much larger than photochemical loss due to reaction with OH and photolysis, and that dry deposition is the dominant loss mechanism. Estimated dry deposition velocities varied between approximately 1 and 6 cm s−1, with relatively high values observed during the day in forested regions, indicating enhanced uptake of H2O2 by vegetation. In order to reproduce the change in H2O2 mixing ratios between sunrise and midday, a variable contribution from transport (10 %–100 %) is required to balance net photochemical production and deposition loss. Transport is most likely related to entrainment from the residual layer above the nocturnal boundary layer during the growth of the boundary layer in the morning. </jats:p>
Autoren
  • Horst Fischer
  • Raoul Axinte
  • Heiko Bozem
  • John N Crowley
  • Cheryl Ernest
  • Stefan Gilge
  • Sascha Hafermann
  • Hartwig Harder
  • Korbinian Hens
  • Ruud HH Janssen
  • Rainer Königstedt
  • Dagmar Kubistin
  • Chinmay Mallik
  • Monica Martinez
  • Anna Novelli
  • Uwe Parchatka
  • Christian Plass-Dülmer
  • Andrea Pozzer
  • Eric Regelin
  • Andreas Reiffs
  • Torsten Schmidt
  • Jan Schuladen
  • Jos Lelieveld
DOI
10.5194/acp-19-11953-2019
eISSN
1680-7324
Ausgabe der Veröffentlichung
18
Zeitschrift
Atmospheric Chemistry and Physics
Sprache
en
Online publication date
2019
Paginierung
11953 - 11968
Status
Published online
Herausgeber
Copernicus GmbH
Herausgeber URL
http://dx.doi.org/10.5194/acp-19-11953-2019
Datum der Datenerfassung
2020
Titel
Diurnal variability, photochemical production and loss processes of hydrogen peroxide in the boundary layer over Europe
Ausgabe der Zeitschrift
19

Datenquelle: Crossref

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