On the origin of pronounced O3 gradients in the thunderstorm outflow region during DC3

Autor(en)

H. Huntrieser, M. Lichtenstern, M. Scheibe, Heinfried Aufmhoff, H. Schlager, T. Pucik, A. Minikin, Bernadett Weinzierl, K. Heimerl, D. Fütterer, B. Rappenglück, L. Ackermann, K. E. Pickering, K.A. Cummings, M.I. Biggerstaff, D.P. Betten, S. Honomichi, M.C. Barth

Abstrakt

Unique in situ measurements of CO, O3, SO2, CH4, NO, NOx, NOy, VOC, CN, and rBC were carried out with the German Deutsches Zentrum für Luft- und Raumfahrt (DLR)-Falcon aircraft in the central U.S.thunderstorms during the Deep Convective Clouds and Chemistry experiment in summer 2012. Fresh and
aged anvil outflow (9–12 km) from supercells, mesoscale convective systems, mesoscale convective complexes, and squall lines were probed over Oklahoma, Texas, Colorado, and Kansas. For three case studies (30 May and 8 and 12 June) a combination of trace species, radar, lightning, and satellite information, as well
as model results, were used to analyze and design schematics of major trace gas transport pathways within and in the vicinity of the probed thunderstorms. The impact of thunderstorms on the O3 composition in the upper troposphere/lower stratosphere (LS) region was analyzed. Overshooting cloud tops injected high amounts of biomass burning and lightning-produced NOx
emissions into the LS, in addition to low O3 mixing ratios from the lower troposphere. As a dynamical response, O3-rich air from the LS was transported
downward into the anvil and also surrounded the outflow. The ΔO3/ΔCO ratio was determined in the anvil outflow region. A pronounced in-mixing of O3
-rich stratospheric air masses was observed in the outflow indicated by highly positive or even negative ΔO3/ΔCO ratios (+1.4 down to 3.9). Photochemical O3 production (ΔO3/ΔCO = +0.1) was found to be minor in the recently lofted pollution plumes. O3 mixing ratios within the aged anvil outflow were mainly enhanced due to dynamical processes.

Organisation(en)

Aerosolphysik und Umweltphysik

Externe Organisation(en)

Deutsches Zentrum für Luft- und Raumfahrt e.V. (DLR), University of Houston, National Aeronautics & Space Administration (NASA), University of Maryland, College Park, University of Oklahoma, Rutherford Appleton Laboratory

Journal

Journal of Geophysical Research: Atmospheres

Band

121

Seiten

6600-6637

Anzahl der Seiten

38

ISSN

2169-897X

DOI

https://doi.org/10.1002/2015JD024279

Publikationsdatum

06-2016

Peer-reviewed

Ja

ÖFOS 2012

103037 Umweltphysik, 103039 Aerosolphysik, 105206 Meteorologie

Schlagwörter

ASJC Scopus Sachgebiete

Forestry, Aquatic Science, Soil Science, Water Science and Technology, Earth-Surface Processes, Geochemistry and Petrology, Geophysics, Oceanography, Palaeontology, Ecology, Earth and Planetary Sciences (miscellaneous), Space and Planetary Science, Atmospheric Science

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/6e8a30e2-5ac3-4a7c-88cb-5570e0d820da