Articles | Volume 16, issue 13
Atmos. Chem. Phys., 16, 8205–8225, 2016
Atmos. Chem. Phys., 16, 8205–8225, 2016

Research article 08 Jul 2016

Research article | 08 Jul 2016

Abundance of fluorescent biological aerosol particles at temperatures conducive to the formation of mixed-phase and cirrus clouds

Cynthia H. Twohy1, Gavin R. McMeeking2,a, Paul J. DeMott3, Christina S. McCluskey3, Thomas C. J. Hill3, Susannah M. Burrows4, Gourihar R. Kulkarni4, Meryem Tanarhte5, Durga N. Kafle6, and Darin W. Toohey7 Cynthia H. Twohy et al.
  • 1Northwest Research Associates, Redmond, WA 98052 USA
  • 2Droplet Measurement Technologies, Boulder, CO 80301 USA
  • 3Dept. of Atmospheric Science, Colorado State University, Fort Collins, CO 80523 USA
  • 4Pacific Northwest National Laboratory, Richland, WA 99354 USA
  • 5Atmospheric Chemistry Department, Max Planck Institute for Chemistry, Mainz, 55128 Germany
  • 6NASA GSFC, ADNET Systems, Greenbelt, MD 20771 USA
  • 7Dept. of Atmospheric and Oceanic Sciences, University of Colorado, Boulder, CO 80309 USA
  • anow at: Handix Scientific, Boulder, CO 80301 USA

Abstract. Some types of biological particles are known to nucleate ice at warmer temperatures than mineral dust, with the potential to influence cloud microphysical properties and climate. However, the prevalence of these particle types above the atmospheric boundary layer is not well known. Many types of biological particles fluoresce when exposed to ultraviolet light, and the Wideband Integrated Bioaerosol Sensor takes advantage of this characteristic to perform real-time measurements of fluorescent biological aerosol particles (FBAPs). This instrument was flown on the National Center for Atmospheric Research Gulfstream V aircraft to measure concentrations of fluorescent biological particles from different potential sources and at various altitudes over the US western plains in early autumn. Clear-air number concentrations of FBAPs between 0.8 and 12 µm diameter usually decreased with height and generally were about 10–100 L−1 in the continental boundary layer but always much lower at temperatures colder than 255 K in the free troposphere. At intermediate temperatures where biological ice-nucleating particles may influence mixed-phase cloud formation (255 K  ≤ T ≤  270 K), concentrations of fluorescent particles were the most variable and were occasionally near boundary-layer concentrations. Predicted vertical distributions of ice-nucleating particle concentrations based on FBAP measurements in this temperature regime sometimes reached typical concentrations of primary ice in clouds but were often much lower. If convection was assumed to lift boundary-layer FBAPs without losses to the free troposphere, better agreement between predicted ice-nucleating particle concentrations and typical ice crystal concentrations was achieved. Ice-nucleating particle concentrations were also measured during one flight and showed a decrease with height, and concentrations were consistent with a relationship to FBAPs established previously at the forested surface site below. The vertical distributions of FBAPs measured on five flights were also compared with those for bacteria, fungal spores, and pollen predicted from the EMAC global chemistry–climate model for the same geographic region.

Short summary
Fluorescent biological aerosol particles were measured in autumn over the continental United States at a variety of altitudes and temperatures, spanning the atmospheric boundary layer to the upper troposphere. Number concentrations of these particles generally decreased with height but were most variable at middle altitudes, above the boundary layer. This corresponds to the temperature range where biological particles may be more important than mineral dust at nucleating ice in clouds.
Final-revised paper