Anderson, BE

Blake, R

Gregory, GL

Kondo, Y

Liu, SC

Sachse, GW

Singh, HB

Thompson, AM

Vay, SA

Wang, Y

English

We examine concurrent measurements of CN (size &gt; 8 nm), NO, and NO(y) in the upper troposphere over the North Atlantic during the SONEX Experiment (Oct.-Nov., 1997). High CN and NO(y) observations are attributed largely to the enhancement in convective outflow. Using the ratio of NO/NO(y) as a chemical clock, we estimate that dilution of convective high-CN plumes is rapid (on a time scale of &lt;2 days) and accounts for a large fraction of elevated CN concentrations above the background. We estimate that less than 7% of observed high-CN (&gt; 10000 cm−3) plumes may be attributed to aircraft emissions. The contribution by aircraft emissions to upper tropospheric CN concentrations is estimated to be significantly higher than 7% because aircraft plumes dilute much faster than convective plumes and hence are sampled less frequently

Blake, DR

eScholarship - University of California

Evidence of convection as a major source of condensation nuclei in the northern midlatitude upper troposphere

https://escholarship.org/content/qt9p2286ng/qt9p2286ng.pdf?t=q58ds8

Evidence of convection as a major source of condensation nuclei in the northern midlatitude upper troposphere

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eScholarship - University of California