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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 33, issue 7
Ann. Geophys., 33, 865–874, 2015
https://doi.org/10.5194/angeo-33-865-2015
© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 33, 865–874, 2015
https://doi.org/10.5194/angeo-33-865-2015
© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.

Regular paper 23 Jul 2015

Regular paper | 23 Jul 2015

WHU VHF radar observations of the diurnal tide and its variability in the lower atmosphere over Chongyang (114.14° E, 29.53° N), China

C. Huang1,2,3,4, S. Zhang1,2,3,4, Q. Zhou5, F. Yi1,2,3,4, K. Huang1,2,3,4, Y. Gong1,2,3,4, Y. Zhang6, and Q. Gan1,2,3,4 C. Huang et al.
  • 1School of Electronic Information, Wuhan University, Wuhan, Hubei, China
  • 2Key Laboratory of Geospace Environment and Geodesy, Ministry of Education, Wuhan, Hubei, China
  • 3State Observatory for Atmospheric Remote Sensing, Wuhan, Hubei, China
  • 4State Key Laboratory of Information Engineering in Surveying, Mapping and Remote Sensing, Wuhan University, Wuhan, Hubei, China
  • 5Electrical and Computer Engineering Department, Miami University, Oxford, Ohio, USA
  • 6College of Hydrometeorology, Nanjing University of Information Science and Technology, Nanjing, China

Abstract. The diurnal tide (DT) and its variability in the lower atmosphere over Chongyang (114.14° E, 29.53° N) were studied based on the newly established Wuhan University (WHU) VHF radar observations with the height intervals of 0.145 km (below 9 km) and 0.58 km (above 9 km) in the whole year of 2012. We find that the DT was the dominant tidal component and showed remarkable height and season variations. A prominent seasonally dependent height variability characteristic is that maximum DT amplitude usually occurs around 6 km in the winter and spring months, which might be due to the tidal wave energy concentration arising from the reflections from the strong eastward tropospheric jet around 13 km and the ground surface. Our results suggest that the background wind is a crucial cause for height variability and seasonal variability of DT. In April 2012, a notable strengthening of DT is observed. Meanwhile, the significant higher harmonics of tides, i.e., the semidiurnal, terdiurnal, and even quarterdiurnal tides, can also be observed, which has seldom been reported. Interestingly, these four tidal components displayed consistent short-term variability, implying that they were excited by the same dramatically varying tidal source. In addition, we identified two symptoms of the coupling of DT and planetary waves (PWs), which can also lead to the short-term DT variability. One is the sum and difference interactions between DT and PWs, causing the tidal amplitude short-term variability as a consequence of the energy exchange among the interacting waves. The other one is the modulation of DT by PWs, leading to that the amplitude of DT varies with the periods of the PWs.

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The diurnal tide and its variability in the lower atmosphere over Chongyang (114.14ºE,29.53ºN) were studied based on the newly established Wuhan University VHF radar observations in the whole year of 2012. We find that the diurnal tide was the dominant tidal component and showed remarkable height and season variations, as well as dramatic short-term variability.
The diurnal tide and its variability in the lower atmosphere over Chongyang...
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