Cloud condensation nuclei measurements in the high troposphere and in jet aircraft exhaust | Zendy

Hudson James G. | Zendy; Xie Youghong | Zendy

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Cloud condensation nuclei measurements in the high troposphere and in jet aircraft exhaust

Author(s) -

Hudson James G.,

Xie Youghong

Publication year - 1998

Publication title -

geophysical research letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.007

H-Index - 273

eISSN - 1944-8007

pISSN - 0094-8276

DOI - 10.1029/97gl03705

Subject(s) - cloud condensation nuclei , jet (fluid) , supersaturation , troposphere , atmospheric sciences , condensation , scavenging , environmental science , meteorology , aerosol , physics , chemistry , mechanics , thermodynamics , biochemistry , antioxidant

Extensive measurements of cloud condensation nuclei (CCN) spectra (1 to 0.02% supersaturation; S) at altitudes up to 12 km are presented. These were similar to many marine boundary layer measurements when normalized to standard sea level pressure. Extremely low CCN concentrations (<10 cm −3 ) were sometimes found in association with very high CN (condensation nuclei) concentrations (>3000 cm −3 ). This was suggestive of cloud scavenging of CCN and production of small particles. Measurements in the exhaust of a B‐757 jet aircraft showed very high CCN/CN ratios and enhancements of CCN concentrations for all S. This suggests a greater impact of jet aircraft on clouds and climate than previous measurements.

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