Distribution of hydrogen peroxide over Europe during the BLUESKY aircraft campaign

• Main Authors: Hamryszczak, Zaneta Teresa, Pozzer, Andrea, Obersteiner, Florian, Bohn, Birger, Steil, Benedikt, Lelieveld, Jos, Fischer, Horst
• Format: Text
• Language: English
• Published: 2022
• Subjects: Bluesky; North Atlantic
• Online Access: https://doi.org/10.5194/acp-2022-89; https://acp.copernicus.org/preprints/acp-2022-89/

In this work we present airborne in situ trace gas observations of hydrogen peroxide (H 2 O 2 ), and methyl hydroperoxide (MHP) estimated from measurements of 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. 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 (Germany). We report average mixing ratios for H 2 O 2 of 0.32 ± 0.25 ppb v , 0.39 ± 0.23 ppb v and 0.38 ± 0.21 ppb v within the upper and middle troposphere and the boundary layer over Europe, respectively. Vertical profiles of measured H 2 O 2 reveal a significant decrease in particular above the boundary layer, compared 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 contrasts with observations during previous air-borne studies over Europe, i.e., 1.64 ± 0.83 ppb v during the HOOVER campaign and 1.67 ± 0.97 ppb v 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 H 2 O 2 . A sensitivity study without H 2 O 2 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.