Condensation nuclei (CN) and ultrafine CN in the free troposphere to 12 km. A case study over the Jungfraujoch High‐Alpine research station
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Publication date
15.09.1999
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01A - Journal article
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Geophysical Research Letters
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Volume
26
Issue / Number
14
Pages / Duration
2195-2198
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Wiley
Place of publication / Event location
Hoboken
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Abstract
Condensation nuclei (CN) were measured in the free troposphere (FT) above the Jungfraujoch (JFJ) high-alpine research station (3454 m; Switzerland) from 4.5 to 12 km asl in a case study on July 30, 1997. Vertical profiles of CN concentration for d ≥ 5 nm (N≥5), d ≥ 15 nm (N≥15 15) were measured, and indicated that ultrafine CN (UCN; 5 ≤ d ≤ 15 nm; N5-15) exhibited a distinct increase with altitude. Some evidence for near-constant values of d(logCN)/dz within discrete layers was found, which generally coincided with different airmasses as delineated by changes in the lapse rate dθ/dz at ∼ 5.5, 6.4, 9.0 and 10.6 km asl. In addition, CN concentration was mapped over a 40 × 75 km horizontal domain at 8.0 km asl centered above the JFJ. A pronounced variation in N≥5,N≥15 and specific humidity, but not in UCN, exhibited quasi-stationary 2-D features and was attributed to the chance encounter of a mountain wave. The case study provides further evidence that the upper FT may be a source of new particles.
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0094-8276
1944-8007
1944-8007
Language
English
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No
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Published
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peer-reviewed
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Closed
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Citation
Nyeki, S., Kalberer, M., Lugauer, M., Weingartner, E., Petzold, A., Schröder, F., Colbeck, I., & Baltensperger, U. (1999). Condensation nuclei (CN) and ultrafine CN in the free troposphere to 12 km. A case study over the Jungfraujoch High‐Alpine research station. Geophysical Research Letters, 26(14), 2195–2198. https://doi.org/10.1029/1999gl900473