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Vertical profiles of aerosol number concentrations observed during clean conditions in the Arctic troposphere in May/June 2004

Minikin, Andreas and Krejci, Radek and Ström, Johan and Jacobi, Hans-Werner and Dörnbrack, Andreas and Herber, Andreas (2005) Vertical profiles of aerosol number concentrations observed during clean conditions in the Arctic troposphere in May/June 2004. European Geosciences Union, General Assembly 2005, 2005-04-24 - 2005-04-29, Vienna (A). (Unpublished)

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Abstract

In order to improve knowledge on the budget, evolution and climate impact of the tropospheric aerosol in both polar regions, four aircraft experiments are planned by the Alfred Wegener Institute (AWI) in the Arctic and Antarctic in the course of the years 2004 to 2007 as a joint international collaboration of research groups in Germany, Japan, Sweden and other countries. The first experiment in the Arctic, ASTAR (Arctic Study on Tropospheric Aerosol and Radiation) 2004, has been successfully performed in May/June 2004. The Polar 4 of the Alfred Wegener Institute, a Dornier-228 turboprop aircraft, carried an extensive payload to characterize aerosol microphysical, chemical and optical properties as a function of altitude (up to 8 km). In this contribution we report on the results of a combination of different instruments providing information on the vertical and spatial variability of the number concentration, thermal stability and size distribution of aerosol particles in the size range from 0.004 to 20 μm in diameter. In the period May 18 to June 7, 2004, 19 measurement flights were performed which showed that very low aerosol number concentrations in the Aitken and the accumulation mode prevailed throughout this period in the lower troposphere. Accumulation mode and non-volatile particles showed in general increasing concentrations with altitude. First analyses of the origin and transport pathways of these clean polar air masses will be presented.

Document Type:Conference or Workshop Item (Poster)
Title:Vertical profiles of aerosol number concentrations observed during clean conditions in the Arctic troposphere in May/June 2004
Authors:
AuthorsInstitution or Email of Authors
Minikin, AndreasUNSPECIFIED
Krejci, RadekUniv. of Stockholm, S
Ström, JohanUniv. of Stockholm, S
Jacobi, Hans-WernerAWI für Polar und Meeresforschung, Bremerhaven
Dörnbrack, AndreasUNSPECIFIED
Herber, AndreasAlfred-Wegener-Institut für Polar und Meeresforschung, Bremerhaven
Date:2005
Status:Unpublished
Keywords:aerosol, Arctic haze, ASTAR, troposphere
Event Title:European Geosciences Union, General Assembly 2005
Event Location:Vienna (A)
Event Type:international Conference
Event Dates:2005-04-24 - 2005-04-29
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W EO - Erdbeobachtung
DLR - Research area:Space
DLR - Program:W EO - Erdbeobachtung
DLR - Research theme (Project):W - Vorhaben Atmosphären- und Klimaforschung (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Atmospheric Trace Species
Deposited By: Dr.rer.nat. Andreas Minikin
Deposited On:04 Dec 2008
Last Modified:27 Apr 2009 04:54

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