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Chemical composition of free tropospheric aerosol for PM1 and coarse mode at the high alpine site Jungfraujoch

Cozic J, Verheggen B, Weingartner E, Crosier J, Bower K, Flynn M, Coe H, Henning S, Steinbacher M, Collaud Coen M, Petzold A, Baltensperger U ...see all

Atmospheric Chemistry and Physics, vol. 8 (2008) pp. 407-423

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Abstract

The chemical composition of submicron (fine

mode) and supermicron (coarse mode) aerosol particles has

been investigated at the Jungfraujoch high alpine research

station (3580ma.s.l., Switzerland) as part of the GAW

aerosol monitoring program since 1999. A clear seasonality

was observed for all major components throughout the period

with low concentrations in winter (predominantly free

tropospheric aerosol) and higher concentrations in summer

(enhanced vertical transport of boundary layer pollutants). In

addition, mass closure was attempted during intensive campaigns

in March 2004, February???March 2005 and August

2005. Ionic, carbonaceous and non-refractory components

of the aerosol were quantified as well as the PM1 and coarse

mode total aerosol mass concentrations. A relatively low

conversion factor of 1.8 for organic carbon (OC) to particulate

organic matter (OM) was found in winter (February???

March 2005). Organics, sulfate, ammonium, and nitrate

were the major components of the fine aerosol fraction that

were identified, while calcium and nitrate were the only

two measured components contributing to the coarse mode.

The aerosol mass concentrations for fine and coarse mode

aerosol measured during the intensive campaigns were not

typical of the long-term seasonality due largely to dynamical

differences. Average fine and coarse mode concentrations

during the intensive field campaigns were 1.7??gm???3

and 2.4??gm???3 in winter and 2.5??gm???3 and 2.0??gm???3 in

summer, respectively. The mass balance of aerosols showed

higher contributions of calcium and nitrate in the coarse

mode during Saharan dust events (SDE) than without SDE.

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Authors

  • J. Cozic

  • B. Verheggen

  • E. Weingartner

  • J. Crosier

  • K. Bower

  • M. Flynn

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