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Index of direction change of zonally averaged wind and change of season |
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| Authors: | ZHU Min XU Jian-xia and ZHANG Ming |
| Institution: | 1. Laboratory of Atmospheric Circulation and Short-Range Climate Forecast, Meteorological College, PLA University of Science and Technology, Nanjing 211101 China;Meteorological Center of Nanjing Air Force, Nanjing 210018 China 2. Meteorological Center of Nanjing Air Force, Nanjing 210018 China 3. Laboratory of Atmospheric Circulation and Short-Range Climate Forecast, Meteorological College, PLA University of Science and Technology, Nanjing 211101 China |
| Abstract: | In this paper, a Wind Direction Change Index (WI), which can describe four-dimensional spatiotemporal changes of the atmospheric circulation objectively and quantitatively, is defined to study its evolution and seasonal variation. The first four modes can be obtained by EOF expansion of the zonally averaged WI. The first mode reveals the basic spatial distribution of the annually averaged WI. The second mode reflects the quasi-harmonic parts of the WI deviations. Tropical, subtropical and extratropical mons... |
| Keywords: | Wind Direction Change Index (WI) Empirical Orthogonal Function (EOF) four-dimensional space-time changes February stratospheric reverse |
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