Climates of the Arctic and Antarctica
Shestakova A.A. —
The Novaya Zemlya bora: the downwind characteristics and the incident flotation structure
// Arctic and Antarctica. – 2016. – ¹ 2.
– P. 86 - 98.
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Review: The Novaya Zemlya bora is the strong abrupt wind, appearing on the western shoulders of the Novaya Zemlya mountain. Such winds reckon in downwind storms, appearing upon the wind flowing over mountains. They are characterized by the increase of wind speed, air temperature jumps and the lapse of pressure on the downwind side. The character of atmospheric disturbances on the downwind side is determined by the landscape and the parameters of the incident flotation. Therefore, the authors give special attention to the structure of the incident flotation and hydrodynamic criteria of the partial blocking of the flow with mountains. Based on the observation data and the MERRA reanalysis, the authors analyze 12 episodes of the Novaya Zemlya bora. They define the specific temperature and wind structure of the incident flotation - the presence of the raised inversion level, the low-tropospheric streamflow at the altitudes, close to the mountain height, the wind reaction to the height. The authors reveal the decrease of the partial blocking of the flow by the mountains in the moments of the bora maximum development. The authors demonstrate that the wind speed during bora is controlled, primarily, by the mesoscale pressure gradient, which can appear in the result of gravity waves distribution over the mountain (wave resistance). The authors show that the Novaya Zemlya bora is very similar to Novorossiysk bora and other winds of this type.
Keywords: supercritical flow, wind regime of the Arctic, flow blocking by mountains, downwind storms, Novorossiysk bora, the Novaya Zemlya bora, problem of flow over the mountain, orographic wind, Novaya Zemlya, extreme wind speed
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