Influence of short-term changes in solar activity on baric field perturbations in the stratosphere and troposphere |
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| Institution: | 1. Key Laboratory of Drinking Water Science and Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China;2. University of Chinese Academy of Sciences, Beijing 100049, China;3. Shenyang Academy of Environmental Sciences, Shenyang 110167, China;1. MOE Key Laboratory of Materials Physics and Chemistry in Extraordinary Conditions, Shaanxi Key Laboratory of Macromolecular Science and Technology, School of Natural & Applied Sciences, Northwestern Polytechnical University, Xi''an, 710072, China;2. Integrated Composites Laboratory (ICL), Department of Chemical and Biomolecular Engineering, University of Tennessee, Knoxville, TN, 37996, USA;3. Scanning Probe Microscopy Group, Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, TN, 37831, USA;4. College of Material Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang, 212003, Jiangsu Province, China;5. Mechanical Engineering, Arkansas State University, PO Box 1740, State University, AR, 72467, USA;6. Key Laboratory of Materials Processing and Mold (Zhengzhou University), Ministry of Education, National Engineering Research Center for Advanced Polymer Processing Technology, Zhengzhou University, Zhengzhou, 450002, China;1. Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China;2. University of Chinese Academy of Sciences, Beijing 100049, China;3. School of Energy, Power and Mechanical Engineering, North China Electric Power University, Changping District, Beijing 102206, China;1. Tree Ring Laboratory, Lamont Doherty Earth Observatory of Columbia University, Palisades, NY, 10964, USA;2. Department of Earth and Environmental Science, Columbia University, New York, NY, 10027, USA;3. NASA Goddard Institute for Space Studies, New York, NY, 10025, USA;4. Ocean & Climate Physics, Lamont-Doherty Earth Observatory of Columbia University, Palisades, NY, 10964, USA;5. Department of Geography and Development and Laboratory of Tree Ring Research, University of Arizona, Tucson, AZ, 85721, USA;6. Department of Geography, University of Cambridge, Cambridge, CB2 3EN, UK;7. Department of Physical Geography, Stockholm University, Stockholm, 106-91, Sweden |
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| Abstract: | Influence of short-term changes in solar activity on baric (pressure) field perturbations is studied using such characteristics as the Sazonov index (IS), describing the intensity of meridional transfer, the Blinova index (IB), describing the intensity of zonal transfer, and ‘vorticity area index’ (VAI) describing the tropospheric cyclonic perturbations. The epoch superposition method is used to reveal effects of the solar central meridian (CM) passage of active regions, the Forbush decreases (FD) in galactic cosmic rays, and the solar proton (SP) events. The results of the analysis show that influence of short-term changes in the solar activity on baric field perturbations is the most evident in the stratosphere (30 mbar-level). The meridional circulation in case of the FD and SP events begin to increase about 5–7 days before the key date, reaches maximum nearby the key date and decays after the key date. The meridional circulation in case of the solar CM passage of active regions starts to increase after the key date and reaches the maximum by 5–6 days. Fluctuations of baric field within periods of 5–7 days typical of meridional and zonal transfers in troposphere (500 mbar-level) are evidently connected with internal dynamics of the atmosphere, not with the effects of solar activity. VAI characterizing cyclonic activity in the troposphere, shows the striking correspondence to changes of the meridional circulation in the stratosphere. Comparison of changes in the stratospheric perturbations with behavior of the UV irradiance in course of the FD and SP events show their full correspondence at the initial stage of these processes. The conclusion is made that growth of baric perturbations observed in the stratosphere in associations with the FD and SP events before the key date is caused by the solar UV irradiance increase, whereas decay of the baric perturbations after the key date is related to direct influence of the solar energetic corpuscular fluxes on the stratosphere. |
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