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Trapping, chemistry, and export of trace gases in the South Asian summer monsoon observed during CARIBIC flights in 2008

Rauthe-Schöch, A. und Baker, Angela und Schuck, T. und Brenninkmeijer, C. A. M. und Zahn, A. und Hermann, M. und Stratmann, Greta und Ziereis, Helmut und Velthoven, Peter van und Lelieveld, J. (2016) Trapping, chemistry, and export of trace gases in the South Asian summer monsoon observed during CARIBIC flights in 2008. Atmospheric Chemistry and Physics (ACP) (16), Seiten 3609-3629. Copernicus Publications. doi: 10.5194/acp-16-3609-2016. ISSN 1680-7316.

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Offizielle URL: http://www.atmos-chem-phys.net/16/3609/2016/

Kurzfassung

The CARIBIC (Civil Aircraft for the Regular Investigation of the Atmosphere Based on an Instrument Container) passenger aircraft observatory performed in situ measurements at 10–12 km altitude in the South Asian summer monsoon anticyclone between June and September 2008. These measurements enable us to investigate this atmospheric region (which so far has mostly been observed from satellites) using the broad suite of trace gases and aerosol particles measured by CARIBIC. Elevated levels of a variety of atmospheric pollutants (e.g. carbon monoxide, total reactive nitrogen oxides, aerosol particles, and several volatile organic compounds) were recorded. The measurements provide detailed information about the chemical composition of air in different parts of the monsoon anticyclone, particularly of ozone precursors. While covering a range of 3500 km inside the monsoon anticyclone, CARIBIC observations show remarkable consistency, i.e. with distinct latitudinal patterns of trace gases during the entire monsoon period. Using the CARIBIC trace gas and aerosol particle measurements in combination with the Lagrangian particle dispersion model FLEXPART, we investigated the characteristics of monsoon outflow and the chemical evolution of air masses during transport. The trajectory calculations indicate that these air masses originated mainly from South Asia and mainland Southeast Asia. Estimated photochemical ages of the air were found to agree well with transport times from a source region east of 90–95° E. The photochemical ages of the air in the southern part of the monsoon anticyclone were systematically younger (less than 7 days) and the air masses were mostly in an ozone-forming chemical mode. In its northern part the air masses were older (up to 13 days) and had unclear ozone formation or destruction potential. Based on analysis of forward trajectories, several receptor regions were identified. In addition to predominantly westward transport, we found evidence for efficient transport (within 10 days) to the Pacific and North America, particularly during June and September, and also of cross-tropopause exchange, which was strongest during June and July. Westward transport to Africa and further to the Mediterranean was the main pathway during July.

elib-URL des Eintrags:https://elib.dlr.de/108380/
Dokumentart:Zeitschriftenbeitrag
Titel:Trapping, chemistry, and export of trace gases in the South Asian summer monsoon observed during CARIBIC flights in 2008
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Rauthe-Schöch, A.MPI f. Chemie, MainzNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Baker, AngelaMPI f. Chemie, MainzNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Schuck, T.MPI f. Chemie, MainzNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Brenninkmeijer, C. A. M.MPI f. Chemie, MainzNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Zahn, A.KIT, KarlsruheNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Hermann, M.Leibniz Inst. for Tropospheric Research, LeipzigNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Stratmann, GretaDLR, IPANICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Ziereis, HelmutDLR, IPANICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Velthoven, Peter vanKNMI, de Bilt, NLNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Lelieveld, J.MPI f. Chemie, MainzNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Datum:17 März 2016
Erschienen in:Atmospheric Chemistry and Physics (ACP)
Referierte Publikation:Ja
Open Access:Ja
Gold Open Access:Ja
In SCOPUS:Ja
In ISI Web of Science:Ja
DOI:10.5194/acp-16-3609-2016
Seitenbereich:Seiten 3609-3629
Verlag:Copernicus Publications
ISSN:1680-7316
Status:veröffentlicht
Stichwörter:Tropopause, CARIBIC, airborne measurements, monsoon
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Raumfahrt
HGF - Programmthema:Erdbeobachtung
DLR - Schwerpunkt:Raumfahrt
DLR - Forschungsgebiet:R EO - Erdbeobachtung
DLR - Teilgebiet (Projekt, Vorhaben):R - Atmosphären- und Klimaforschung
Standort: Oberpfaffenhofen
Institute & Einrichtungen:Institut für Physik der Atmosphäre > Atmosphärische Spurenstoffe
Hinterlegt von: Stratmann, Greta
Hinterlegt am:25 Nov 2016 14:23
Letzte Änderung:02 Mai 2019 13:59

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