Characterization of long-term and seasonal variations of black carbon (BC) concentrations at Neumayer, Antarctica

Characterization of long-term and seasonal variations of black carbon (BC) concentrations at Neumayer, Antarctica

Continuous black carbon (BC) observations were conducted from 1999 through 2009 by an Aethalometer (AE10) and from 2006 through 2011 by a Multi-Angle Absorption Photometer (MAAP) at Neumayer Station (NM) under stringent contamination control. Considering the respective observation period, BC concent...

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Bibliographic Details
Published in:Atmospheric chemistry and physics 2013-02, Vol.13 (3), p.1579-1590
Main Authors: Weller, R, Minikin, A, Petzold, A, Wagenbach, D, König-Langlo, G
Format: Article
Language:eng
Subjects:
Aerosols
Albedo
Carbon
Optical properties
Seasonal variations
Standard deviation
Stations
Wavelengths
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Summary:Continuous black carbon (BC) observations were conducted from 1999 through 2009 by an Aethalometer (AE10) and from 2006 through 2011 by a Multi-Angle Absorption Photometer (MAAP) at Neumayer Station (NM) under stringent contamination control. Considering the respective observation period, BC concentrations measured by the MAAP were somewhat higher (median plus or minus standard deviation: 2.1 plus or minus 2.0 ng m super(-3)) compared to the AE10 results (1.6 plus or minus 2.1 ng m super(-3)). Neither for the AE10 nor for the MAAP data set a significant long-term trend could be detected. Consistently a pronounced seasonality was observed with both instruments showing a primary annual maximum between October and November and a minimum in April with a maximum/minimum ratio of 4.5/1.6 = 3.8 and 2.7/0.64 = 4.2 for the MAAP and AE10 data, respectively. Occasionally a secondary summer maximum in January/February was visible. With the aim to assess the impact of BC on optical properties of the aerosol at NM, we evaluated the BC data along with particle scattering coefficients measured by an integrating nephelometer. We found the mean single scattering albedo of omega sub(550) = 0.992 plus or minus 0.0090 (median: 0.994) at a wavelength of 550 nm with a range of values from 0.95 to 1.0.
ISSN:1680-7324
1680-7316
1680-7324