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Radiatively-driven processes in forest fire and desert dust plumes.

Weinzierl, Bernadett (2008) Radiatively-driven processes in forest fire and desert dust plumes. Dissertation. DLR-Forschungsbericht. DLR-FB--2008-11, 178 S.

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Kurzfassung

The absorption of solar radiation by atmospheric aerosol particles is important for the climate effects of aerosols. Absorption by aerosol particles heats atmospheric layers, even though the net effect for the entire atmospheric column may still be a cooling. Most experimental studies on absorbing aerosols so far focussed mainly on the aerosol properties and did not consider the influence of the aerosols on the thermodynamic structure of the atmosphere. In this study, data from two international aircraft field experiments, the Intercontinental Transport of Ozone and Precursors study (ITOP) 2004 and the Saharan Mineral Dust Experiment (SAMUM) 2006 are investigated. The ITOP data were collected before the work on this thesis started, while the logistics and the instrument preparation of the SAMUM campaign, the weather forecast during SAMUM and the in-situ aerosol measurements during SAMUM were done within this thesis. The experimental data are used to explore the impact of layers containing absorbing forest fire and desert dust aerosol particles on the atmospheric stability and the implications of a changed stability on the development of the aerosol microphysical and optical properties during long-range transport. For the first time, vertical profiles of the Richardson number Ri are used to assess the stability and mixing in forest fire and desert dust plumes. Also for the first time, the conclusions drawn from the observations of forest fire and desert dust aerosol, at first glance apparently quite different aerosol types, are discussed from a common perspective. Two mechanisms, the self-stabilising and the sealed ageing effect, acting in both forest fire and desert dust aerosol layers, are proposed to explain the characteristic temperature structure as well as the aerosol properties observed in lofted forest fire and desert dust plumes. The proposed effects impact on the ageing of particles within the plumes and reduce the plume dilution, therefore extending the plume lifetime.

Dokumentart:Berichtsreihe (DLR-Forschungsbericht, Dissertation)
Titel:Radiatively-driven processes in forest fire and desert dust plumes.
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Weinzierl, BernadettNICHT SPEZIFIZIERT
Datum:2008
Seitenanzahl:178
ISSN:1434-8454
Status:veröffentlicht
Stichwörter:aerosol; forest fire; desert dust; airborne measurements; particle size distribution; mixing state; absorption of solar radiation; lofted aerosol layers; long-range transport; atmospheric stability; heating rates; self-stabilising effect; sealed aging effect; ITOP 2004; SAMUM 2006
Institution:Ludwig-Maximilians-Universität München
Abteilung:Physik
HGF - Forschungsbereich:Verkehr und Weltraum (alt)
HGF - Programm:Weltraum (alt)
HGF - Programmthema:W - keine Zuordnung
DLR - Schwerpunkt:Weltraum
DLR - Forschungsgebiet:W - keine Zuordnung
DLR - Teilgebiet (Projekt, Vorhaben):W -- keine Zuordnung (alt)
Standort: Oberpfaffenhofen
Institute & Einrichtungen:Institut für Physik der Atmosphäre > Atmosphärische Spurenstoffe
Hinterlegt von: Dr.rer.nat. Bernadett Weinzierl
Hinterlegt am:04 Aug 2008
Letzte Änderung:14 Mär 2011 13:24

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