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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.