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Gravity wave breaking in easterly flow over Greenland and associated low level barrier- and reverse tip-jets |
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| Authors: | Haraldur Ólafsson Hálfdán Ágústsson |
| Institution: | 1. Háskóli íslands (University of Iceland), Reykjavík, Iceland 2. Bergen School of Meteorology, Geophysical Institute, University of Bergen, Bergen, Norway 3. Veeurstofa íslands (Icelandic Meteorological Office), Reykjavík, Iceland 4. Reiknistofa í veeurfr?ei (Institute for Meteorological Research), Reykjavík, Iceland |
| Abstract: | A first evidence of severe turbulence in the lower stratosphere during easterly tropospheric flow over Greenland is presented. A numerical simulation shows the turbulence to be associated with gravity wave breaking and that simulating with a horizontal resolution of 3 km gives substantially greater and more realistic turbulence than at a 9 km horizontal resolution. It is concluded that real-time simulations at high resolutions would improve aviation forecasts. As the atmospheric flow impinges on South-Greenland a barrier jet, a reverse tip jet and amplified mountain waves with secondary wave breaking are generated at the same time. |
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