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| Titel |
Coincident measurements of PMSE and NLC above ALOMAR (69° N, 16° E) by radar and lidar from 1999–2008 |
| VerfasserIn |
N. Kaifler, G. Baumgarten, J. Fiedler, R. Latteck, F.-J. Lübken, M. Rapp |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 11, no. 4 ; Nr. 11, no. 4 (2011-02-16), S.1355-1366 |
| Datensatznummer |
250009352
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| Publikation (Nr.) |
 copernicus.org/acp-11-1355-2011.pdf |
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| Zusammenfassung |
| Polar Mesosphere Summer Echoes (PMSE) and Noctilucent Clouds
(NLC) have been routinely measured at the ALOMAR research
facility in Northern Norway (69° N, 16° E)
by lidar and radar, respectively. 2900 h of lidar
measurements by the ALOMAR Rayleigh/Mie/Raman lidar were
combined with almost 18 000 h of radar measurements by the
ALWIN VHF radar, all taken during the years 1999 to 2008, to
study simultaneous and common-volume observations of both
phenomena. PMSE and NLC are known from both theory and
observations to be positively linked. We quantify the
occurrences of PMSE and/or NLC and relations in altitude,
especially with respect to the lower layer boundaries. The
PMSE occurrence rate is with 75.3% considerably higher than
the NLC occurrence rate of 19.5%. For overlapping PMSE and
NLC observations, we confirm the coincidence of the lower
boundaries and find a standard deviation of 1.26 km, hinting
at very fast sublimation rates. However, 10.1% of all NLC
measurements occur without accompanying PMSE. Comparison of
occurrence rates with solar zenith angle reveals that NLC
without PMSE mostly occur around midnight indicating that the
ice particles were not detected by the radar due to the reduced
electron density. |
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