The relationship between ionospheric total electron content (TEC) over East Asia and the tropospheric circulation around the Qinghai-Tibet Plateau obtained with a partial correlation method |
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Authors: | Guirong Xu Weixing Wan Chengli She Liangmin Du |
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Institution: | 1. Institute of Geology and Geophysics, Chinese Academy of Sciences, Beituchengxi Road 19#, 100029 Beijing, China;2. Institute of Heavy Rain, China Meteorological Administration, Donghudong Road 3#, 430074 Wuhan, China;3. Graduate University, Chinese Academy of Sciences, Yuquan Road 19#, 100049 Beijing, China;4. Wuhan Regional Climate Center, Donghudong Road 3#, 430074 Wuhan, China |
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Abstract: | This paper reports a study on the relationship between ionospheric total electron content (TEC) over East Asia and the tropospheric circulation around the Qinghai-Tibet Plateau. Ionospheric TEC over East Asia are obtained from 25 observatories during 1996–2004. By applying a partial correlation method which can eliminate the influences of solar and geomagnetic activities, we find no significant correlation between TEC and the Asian zonal circulation index (Iz), but find a positive correlation between the day-to-day variability of TEC and Iz. We suggest that the positive correlation is closely related with the topography of the Qinghai-Tibet Plateau. The dynamical effect on airflow of the plateau can generate vortexes, and the vortexes may continuously excite internal gravity waves (IGWs) which transmit up to the ionosphere and cause regional wave disturbances. This study gives evidence for the dynamical mechanism of ionosphere–troposphere coupling and shows the importance of the Qinghai-Tibet Plateau in the ionosphere–troposphere coupling over East Asia. |
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Keywords: | Ionospheric TEC Tropospheric circulation Partial correlation method |
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