In:
Atmospheric Chemistry and Physics, Copernicus GmbH, Vol. 22, No. 14 ( 2022-07-22), p. 9483-9497
Abstract:
Abstract. In this work we present airborne in situ trace gas
observations of hydrogen peroxide (H2O2) and the sum of
organic hydroperoxides over Europe during the Chemistry of the Atmosphere –
Field Experiments in Europe (CAFE-EU, also known as BLUESKY) aircraft
campaign using a wet chemical monitoring system, the HYdrogen Peroxide and
Higher Organic Peroxide (HYPHOP) monitor. The campaign took place in
May–June 2020 over central and southern Europe with two additional flights
dedicated to the North Atlantic flight corridor. Airborne measurements were
performed on the High Altitude and LOng-range (HALO) research operating out
of Oberpfaffenhofen (southern Germany). We report average mixing ratios for
H2O2 of 0.32 ± 0.25, 0.39 ± 0.23
and 0.38 ± 0.21 ppbv in the upper and middle troposphere and the
boundary layer over Europe, respectively. Vertical profiles of measured
H2O2 reveal a significant decrease, in particular above the
boundary layer, contrary to previous observations, most likely due to cloud
scavenging and subsequent rainout of soluble species. In general, the
expected inverted C-shaped vertical trend with maximum hydrogen peroxide
mixing ratios at 3–7 km was not found during BLUESKY. This deviates from
observations during previous airborne studies over Europe, i.e., 1.64 ± 0.83 ppbv during the HOOVER campaign and 1.67 ± 0.97 ppbv during UTOPIHAN-ACT II/III. Simulations with the global
chemistry–transport model EMAC partly reproduce the strong effect of rainout
loss on the vertical profile of H2O2. A sensitivity study without
H2O2 scavenging performed using EMAC confirms the strong influence
of clouds and precipitation scavenging on hydrogen peroxide concentrations.
Differences between model simulations and observations are most likely due
to difficulties in the simulation of wet scavenging processes due to the
limited model resolution.
Type of Medium:
Online Resource
ISSN:
1680-7324
DOI:
10.5194/acp-22-9483-2022
DOI:
10.5194/acp-22-9483-2022-supplement
Language:
English
Publisher:
Copernicus GmbH
Publication Date:
2022
detail.hit.zdb_id:
2092549-9
detail.hit.zdb_id:
2069847-1
