Characteristics of Stable Flows over Southern Greenland |
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| Authors: | Andrew Orr Edward Hanna Julian CR Hunt John Cappelen Konrad Steffen AG Stephens |
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| Institution: | (1) Centre for Polar Observation and Modelling, Dept. of Space and Climate Physics, University College London, UK;(2) Department of Geography, University of Sheffield, UK;(3) Danish Meteorological Institute, , Copenhagen, Denmark;(4) Cooperative Institute for Research in Environmental Sciences, University of Colorado, U.S.A;(5) British Atmospheric Data Centre, Rutherford Appleton Laboratory, UK;(6) Present address: ECMWF, Shinfield Pk, Reading, UK |
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| Abstract: | The main characteristic features of stable atmospheric flows over a large mountain plateau are summarised and then compared with mesoscale and synoptic scale numerical simulation, meteorological analysis, satellite imagery, and surface observations for the cases of flows over Southern Greenland for four wind directions. The detailed features are identified using the concepts and scaling of stably stratified flow over large mountains with variations in surface roughness, elevation, and heating. For westerly and easterly winds detached jets form at the southern tip, where coastal jets converge, which propagate large distances across the ocean. Near coasts katabatic winds can combine with barrier jets and wake flows generated by synoptic winds. Note how the approach flow rises/falls over southern Greenland for easterly/westerly winds, leading in both cases to more cloud on the western side. Some conclusions are drawn about the large-scale influences of these flows; detached jets in the atmosphere; air-sea interaction; formation of low pressure systems. For accurate simulations of these flows, mesoscale models are necessary with resolutions of order of 20 km or less. |
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| Keywords: | Greenland Wind-jets Air-sea interaction Synoptic flows |
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