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| Titel |
Characterisation and airborne deployment of a new counterflow virtual impactor inlet |
| VerfasserIn |
T. Shingler, S. Dey, A. Sorooshian, F. J. Brechtel, Z. Wang, A. Metcalf, M. Coggon, J. Mülmenstädt, L. M. Russell, H. H. Jonsson, J. H. Seinfeld |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1867-1381
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Measurement Techniques ; 5, no. 6 ; Nr. 5, no. 6 (2012-06-06), S.1259-1269 |
| Datensatznummer |
250002964
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| Publikation (Nr.) |
 copernicus.org/amt-5-1259-2012.pdf |
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| Zusammenfassung |
| A new counterflow virtual impactor (CVI) inlet is introduced with details of
its design, laboratory characterisation tests and deployment on an aircraft
during the 2011 Eastern Pacific Emitted Aerosol Cloud Experiment (E-PEACE).
The CVI inlet addresses three key issues in previous designs; in particular,
the inlet operates with: (i) negligible organic contamination; (ii) a
significant sample flow rate to downstream instruments (∼15 l min−1)
that reduces the need for dilution; and (iii) a high level of
accessibility to the probe interior for cleaning. Wind tunnel experiments
characterised the cut size of sampled droplets and the particle
size-dependent transmission efficiency in various parts of the probe. For a
range of counter-flow rates and air velocities, the measured cut size was
between 8.7–13.1 μm. The mean percentage error between cut size
measurements and predictions from aerodynamic drag theory is 1.7%. The
CVI was deployed on the Center for Interdisciplinary Remotely Piloted
Aircraft Studies (CIRPAS) Twin Otter for thirty flights during E-PEACE to
study aerosol-cloud-radiation interactions off the central coast of
California in July and August 2011. Results are reported to assess the
performance of the inlet including comparisons of particle number
concentration downstream of the CVI and cloud drop number concentration
measured by two independent aircraft probes. Measurements downstream of the
CVI are also examined from one representative case flight coordinated with
shipboard-emitted smoke that was intercepted in cloud by the Twin Otter. |
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