A case of transatlantic aerosol transport detected at the Schneefernerhaus Observatory (2650 m) on the northern edge of the Alps

作者：Birmili Wolfram^*; Goebel Tina; Sonntag Andre; Ries Ludwig; Sohmer Ralf; Gilge Stefan; Levin Ingeborg; Stohl Andreas

来源：Meteorologische Zeitschrift, 2010, 19(6): 591-600.

DOI：10.1127/0941-2948/2010/0465

An unusual peak in atmospheric aerosol particle number and mass concentration occurred on September 20 and 21, 2006 at the Schneefernerhaus (SFH) Observatory, Germany. A source-receptor analysis using the Lagrangian transport model FLEXPART suggested that polluted air from source regions in the Western and Central U. S. travelled within 4-8 days over the Atlantic to the European Alpine region. A warm conveyor belt over the northern Great Plains was identified as the essential process lifting the boundary layer air to the high altitudes required for a rapid transatlantic transit. The layer arriving at SFH had an aerosol mass concentration of about 30 mu g m(-3), and a particle number size distribution showing an aged accumulation mode aerosol with mode diameter around 0.3 mu m. A combination of in-situ humidity, Po-214 and carbon monoxide measurements as well as upper air observations (radiosoundings) suggested that the layer had no previous contact with the local/European boundary layer. A screening of three years of FLEXPART simulations (2005-2007) yielded this case study as the only event of transatlantic anthropogenic aerosol to SFH where mixing with the boundary layer could safely be excluded. The event therefore represents rare surface-based evidence of transatlantic transport of fine and ultrafine aerosols.

• 出版日期2010-12