Simulation of gravity wave effects under solstice conditions using a 3-D circulation model of the middle atmosphere |
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| Institution: | 1. Institute for Ecological Research and Pollution Control of Plateau Lakes, School of Ecology and Environmental Sciences, Yunnan University, Kunming 650500, China;2. Jiangsu Provincial Academy of Environmental Science, Nanjing 210098, China;3. Yunnan Key Laboratory of Pollution Process and Management of Plateau Lake-Watershed, Yunnan Research Academy of Eco-environmental Sciences, Kunming 650034, China;4. Department of Ecoscience and Arctic Research Centre, Aarhus University, Aarhus 8000, Denmark;5. Sino-Danish Centre for Education and Research, Chinese Academy of Sciences, Beijing 100101, China;6. Limnology Laboratory, Department of Biological Sciences and Centre for Ecosystem Research and Implementation, Middle East Technical University, Ankara 06800, Turkey;7. Institute of Marine Sciences, Middle East Technical University, Erdemli-Mersin 33731, Turkey |
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| Abstract: | Vertically propagating gravity waves can transport momentum and energy from the troposphere up to the mesosphere and thus modify the circulation of the middle atmosphere. The effects of regional gravity wave sources, together with temporal changes of gravity wave activity, are studied under solstice conditions in a 3-D circulation model using a simplified parameterization scheme for the gravity momentum deposition. In this way we can reproduce the reversal of the mean zonal wind with height and very low temperatures at the summer mesopause region. Using a stochastic forcing by taking the gravity wave parameters at random, characteristic oscillations are found with periods in the planetary scale range (2, 4 and 5 days) and in the tidal range (1 day, 16 h and 12 h). |
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