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| Titel |
Characteristics of Arctic winds at CANDAC-PEARL (80° N, 86° W) and Svalbard (78° N, 16° E) for 2006–2009: radar observations and comparisons with the model CMAM-DAS |
| VerfasserIn |
A. H. Manson, C. E. Meek, X. Xu, T. Aso, J. R. Drummond, C. M. Hall, W. K. Hocking, M. Tsutsumi, W. E. Ward |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 29, no. 10 ; Nr. 29, no. 10 (2011-10-31), S.1927-1938 |
| Datensatznummer |
250017116
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| Publikation (Nr.) |
 copernicus.org/angeo-29-1927-2011.pdf |
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| Zusammenfassung |
Operation of a Meteor Wind Radar (MWR) at Eureka, Ellesmere Island
(80° N, 86° W) began in February 2006; this is the location of the
Polar Environmental and Atmospheric Research Laboratory (PEARL), operated by
the "Canadian Network for the Detection of Atmospheric Change" (CANDAC). The
first 36 months of wind data (82–97 km) are here combined with
contemporaneous winds from the Meteor Wind Radar at Adventdalen, Svalbard
(78° N, 16° E), to provide the first evidence for substantial
interannual variability (IAV) of longitudinally spaced observations of
mean/background winds and waves at such High Arctic latitudes. The
influences of "Sudden Stratospheric Warmings" (SSW) are also apparent.
Monthly meridional (north-south, NS) 3-year means for each location/radar
demonstrate that winds (82–97 km) differ significantly between Canada and
Norway, with winter-equinox values generally northward over Eureka and
southward over Svalbard. Using January 2008 as case study, these oppositely
directed meridional winds are related to mean positions of the Arctic
mesospheric vortex. The vortex is from the Canadian Middle Atmosphere Model,
with its Data Assimilation System (CMAM-DAS). The characteristics of
"Sudden stratospheric Warmings" SSW in each of the three winters are
noted, as well as their uniquely distinctive short-term mesospheric wind
disturbances.
Comparisons of the mean winds over 36 months at 78 and 80° N, with those
within CMAM-DAS, are featured. E.g. for 2007, while both monthly mean EW and
NS winds from CMAM/radar are quite similar over Eureka (82–88 km), the
modeled autumn-winter NS winds over Svalbard (73–88 km) differ significantly
from observations. The latter are southward, and the modeled winds over
Svalbard are predominately northward. The mean positions of the winter polar
vortex are related to these differences. |
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