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Juerg Schmidli, Brian Billings, Fotini K. Chow, Stephan F. J. de Wekker, James Doyle, Vanda Grubišić, Teddy Holt, Qiangfang Jiang, Katherine A. Lundquist, Peter Sheridan, Simon Vosper, C. David Whiteman, Andrzej A. Wyszogrodzki, and Günther Zängl

section, is very similar for all models; Fig. 11c ). This result is quite remarkable. Despite large differences in the detailed spatial structure of the simulated valley wind system ( Fig. 8 ), the bulk flow evolution is almost identical in all models, at least until 1200 LT. Regarding the spatial structure of the flow, note the high-frequency oscillation of the along-valley wind speed over the plain and near the valley end for EULAG. These oscillations may be associated with unresolved cellular

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Ivana Stiperski and Vanda Grubišić

smoother, and the rotor in the lee of the first mountain better organized compared to the flow past a single peak ( Fig. 3a ). Particularly interesting is the H n = ⅔ case ( Fig. 3c ), where one finds a large-amplitude wave over the valley only. Upon encountering the second obstacle the waves almost completely cancel out; farther downstream only short-wavelength small-amplitude oscillations remain. Compared to the other flow realizations, this particular solution is rather unsteady, suggesting that

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