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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Authors
Nyeki, Stephan
Kalberer, Markus
Lugauer, Matthias
Petzold, Andreas
Schröder, Franz
Colbeck, Ian
Baltensperger, Urs
Author (Corporation)
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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550 - Geowissenschaften
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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 review of the complete publication
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Closed
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Citation
NYEKI, Stephan, Markus KALBERER, Matthias LUGAUER, Ernest WEINGARTNER, Andreas PETZOLD, Franz SCHRÖDER, Ian COLBECK und Urs BALTENSPERGER, 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. 15 September 1999. Bd. 26, Nr. 14, S. 2195–2198. DOI 10.1029/1999gl900473. Verfügbar unter: https://irf.fhnw.ch/handle/11654/46895