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Composition of the TTL over Darwin: local mixing or long-range transport?

Heyes, W.J. und Vaughan, G. und Allen, G. und Volz-Thomas, A. und Pätz, H.-W. und Busen, R. (2009) Composition of the TTL over Darwin: local mixing or long-range transport? Atmospheric Chemistry and Physics, 9, Seiten 7725-7736.

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Offizielle URL: http://www.atmos-chem-phys.net/9/7725/2009/

Kurzfassung

We present ozone and carbon monoxide measurements taken in Darwin, Australia, during the wet season of 2005/2006, to examine whether the composition of the Tropical Tropopause Layer (TTL) reflects that of the local boundary layer or is influenced more by advection from distant sources. We find that the latter predominates in the upper TTL, and is also the major influence in the lower TTL, except during an active monsoon phase. The day-to-day variability of ozone in the TTL is far greater than that in the lower troposphere, and correlates closely with air mass origin deduced from trajectory calculations based on standard ECMWF wind analyses. Although clear evidence of recent local uplift was found in carbon monoxide tracer measurements recorded inside convective anvils, no such signal was found out-of-cloud in the background TTL, where the measured variability correlated well with air mass origin deduced from back-trajectories. This study suggests that the composition of the TTL is ultimately determined by vertical mixing in certain "hot spot" regions of the tropics, with advection from these regions dominating the composition elsewhere.

Dokumentart:Zeitschriftenbeitrag
Titel:Composition of the TTL over Darwin: local mixing or long-range transport?
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Heyes, W.J.Univ. of Manchester, Manchester, UK
Vaughan, G.Univ. of Manchester, Manchester, UK
Allen, G.Univ. of Manchester, Manchester, UK
Volz-Thomas, A.FZ Jülich, Jülich
Pätz, H.-W.FZ Jülich, Jülich
Busen, R.DLR
Datum:19 Oktober 2009
Erschienen in:Atmospheric Chemistry and Physics
Referierte Publikation:Ja
In Open Access:Ja
In SCOPUS:Ja
In ISI Web of Science:Ja
Band:9
Seitenbereich:Seiten 7725-7736
Status:veröffentlicht
Stichwörter:TTL, carbon monoxide, ozone
HGF - Forschungsbereich:Verkehr und Weltraum (alt)
HGF - Programm:Weltraum (alt)
HGF - Programmthema:W EO - Erdbeobachtung
DLR - Schwerpunkt:Weltraum
DLR - Forschungsgebiet:W EO - Erdbeobachtung
DLR - Teilgebiet (Projekt, Vorhaben):W - Vorhaben Atmosphären- und Klimaforschung (alt)
Standort: Oberpfaffenhofen
Institute & Einrichtungen:Institut für Physik der Atmosphäre > Atmosphärische Spurenstoffe
Hinterlegt von: Dr.phil.nat. Reinhold Busen
Hinterlegt am:27 Okt 2009 15:26
Letzte Änderung:12 Dez 2013 20:43

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