EarthRef.org Reference Database (ERR)
Development and Maintenance by the EarthRef.org Database Team

Detailed Reference Information
Rogers et al. 2001
Rogers, D.C., DeMott, P.J. and Kreidenweis, S.M. (2001). Airborne measurements of tropospheric ice-nucleating aerosol particles in the Arctic spring. Journal of Geophysical Research 106: doi: 10.1029/2000JD900790. issn: 0148-0227.

Instrumented aircraft flights were made during field experiments in the Arctic Ocean, the NASA FIRE Arctic Cloud Experiment and SHEBA (Surface Heat Budget of the Arctic). Airborne measurements of ice nucleating aerosol particles (IN) used a continuous flow diffusion (CFD) chamber, covering -10¿ to -30 ¿C and humidities from ice saturation to water supersaturation. During selected time periods, ice crystals that grew on ice nuclei in the chamber were sampled onto electron microscope (EM) grids for later examination of the nucleating particles. Samples of total aerosol (IN and non-IN) were also collected for comparative analyses. Concentrations of IN ranged from zero to rare very high values (hundreds per liter at -25 ¿C), making the frequency distribution of IN highly skewed: when accumulated as 10 s average concentrations (volume ~0.17 L), 50% were zero. Additional evidence of few IN was seen in thin low-level stratus clouds at -10¿ to -20 ¿C that persisted for several days with low concentrations of ice crystals (~0.1 L-1) and a few tenths g m-3 liquid water. On occasion, small regions of high IN concentrations (hundreds per liter) were detected near the surface. The EM analyses indicated that ice nuclei a few tenths micrometer in size contained crustal materials (primarily Si) and had widely varying morphology. Many IN particles produced weak or no X-ray signatures, suggesting a dominant low-molecular-weight component not detected by the energy dispersive X-ray (EDX) system, and were probably carbonaceous. In contrast, for the total aerosol, S or S and Si were dominant components, and few particles had no X-ray signature. ¿ 2001 American Geophysical Union

BACKGROUND DATA FILES

Abstract

Keywords
Atmospheric Composition and Structure, Atmospheric Composition and Structure, Aerosols and particles (0345, 4801), Atmospheric Composition and Structure, Cloud physics and chemistry
Journal
Journal of Geophysical Research
http://www.agu.org/journals/jb/
Publisher
American Geophysical Union
2000 Florida Avenue N.W.
Washington, D.C. 20009-1277
USA
1-202-462-6900
1-202-328-0566
service@agu.org
Click to clear formClick to return to previous pageClick to submit