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| Titel |
Seasonal variations of the semi-diurnal and diurnal tides in the MLT: multi-year MF radar observations from 2–70° N, modelled tides (GSWM, CMAM) |
| VerfasserIn |
A. H. Manson, C. Meek, M. Hagan, J. Koshyk, S. Franke, D. Fritts, C. Hall, W. Hocking, K. Igarashi, J. MacDougall, D. Riggin, R. Vincent |
| 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 ; 20, no. 5 ; Nr. 20, no. 5, S.661-677 |
| Datensatznummer |
250014399
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| Publikation (Nr.) |
 copernicus.org/angeo-20-661-2002.pdf |
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| Zusammenfassung |
| In an earlier paper
(Manson et al., 1999a) tidal data (1990–1997) from six Medium Frequency
Radars (MFR) were compared with the Global Scale Wave Model (GSWM, original
1995 version). The radars are located between the equator and high northern
latitudes: Christmas Island (2° N), Hawaii (22° N), Urbana (40° N), London
(43° N), Saskatoon (52° N) and Tromsø (70° N). Common harmonic analysis was
applied, to ensure consistency of amplitudes and phases in the 75–95 km
height range. For the diurnal tide, seasonal agreements between observations
and model were excellent while for the semi-diurnal tide the seasonal
transitions between clear solstitial states were less well captured by the
model.
Here the data set is increased by the addition of two
locations in the Pacific-North American sector: Yamagawa 31° N, and Wakkanai
45° N. The GSWM model has undergone two additional developments (1998, 2000)
to include an improved gravity wave (GW) stress parameterization, background
winds from UARS systems and monthly tidal forcing for better characterization
of seasonal change. The other model, the Canadian Middle Atmosphere Model (CMAM)
which is a General Circulation Model, provides internally generated forcing
(due to ozone and water vapour) for the tides.
The two GSWM versions show distinct differences, with the
2000 version being either closer to, or further away from, the observations
than the original 1995 version. CMAM provides results dependent upon the GW
parameterization scheme inserted, but one of the schemes provides very useful
tides, especially for the semi-diurnal component.
Key words. Meteorology and
atmospheric dynamics (middle atmosphere dynamics; waves and tides) |
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