Abstract
A dynamic study on Ekman characteristics by using 1998 SCSMEX and TIPEX boundary layer data is made. The results are as follows: (1) Similar dynamical Ekman characteristics are observed in the Tibetan Plateau and in the South China Sea and its surrounding area. (2) The thickness of the boundary layer is about 2250 m over the Tibetan Plateau, and considering its variation, the thickness could be up to 2250–2750 m. In the tropical southwest Pacific, the thickness of the boundary layer is about 2000 m, and the variation is smaller; a smaller thickness of the boundary layer is in the plain area of the Bohai Sea. (3) Because of the difference in elevation between the Tibetan Plateau and the tropical ocean area, the influence of the boundary layer on the atmosphere is quite different although the two areas have almost the same thickness for the boundary layer, the height where the friction forcing occurs is quite different. (4) The vertical structure of turbulence friction is quite different in the Plateau and in the tropical ocean area. Calculations by 1998 SCSMEX and TIPEX boundary layer data indicate that even in the lowest levels, eddy viscosity in the Tibetan Plateauan can be 2.3 times than in the tropical ocean area.
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References
Holmbore, J., 1947:Dynamic Meteorology. London Chapman and Hall Limited, 378 pp.
Hulton, J.R., 1972:An Introduction to Dynamic Meteorology. Science Press, Beijing, 288 pp.
Luo, H., and M., Yanai, 1984: The large-scale circulation and heat sources over the Tibetan Plateau and surrounding areas during the early summer of 1979. Part II: Heat and moisture budgets.Mon. Wea. Rev.,112, 966–989.
Nicholls, S., 1985: Aircraft observations of Ekman layer during the joint air-sea interaction experiment.Quart. J. Roy. Meteor. Soc,3, 391–426.
Panchev, S., 1987: A barotropic model of the Ekman planetary boundary layer based on the geostrophic momentum approximation.Boundary-Layer Meteorology,40, 339–347.
Saffman, P. G., 1962: The effect of wind shear on horizontal spread from an instaneous ground source.Quart. J. Roy. Meteor. Soc.,88, 382–393.
Smith, F. B., 1965: The role of wind shear in horizontal diffusion of ambient particles.Quart. J. Roy. Meteor. Soc,91, 318–329.
Song Zhengshan, Zhu Baozhen, and Sun Guowu, 1984: Preliminary study on the thermal mixed layer in western Plateau.Papers on Tibetan Plateau Meteorological Experiment. Beijing: Science Press,2, 253–261. (in Chinese)
Taylor, A. D., 1982: Puff growth in an Ekman layer.J. Atmos. Sci.,39, 937–950.
Taylor, G.I., 1915:Eddy Motion in the Atmosphere, The Scientific Papers of Sir Geoffrey Ingram Taylor, Volume II. Meteorology, Oceanography and Turbulent Flow, Cambridge University Press. 515 pp.
Wang Jizhi, and Yang Yuangqin, 1999: An observed study on ’98 flooding in China by integrated diagnosis of ’98 TIPEX on plateau and multi-channel data. Third International Scientific Conference on the Global Energy and Water Cycle Experiment, Beijing, China, 109–110.
Xu Xiangde, Tao Shiyan, Wang Jizhi, Chen Lianshou, Zhou Li, and Wang Xiurong, 2002: The relationship between water vapor transport features of Tibetan Plateau-Monsoon “large triangle” affecting region and drought-flood abnormality of China.Acta Meteorologien Sinica,60(3), 257–266. (in Chinese)
Yang Tacheng, 1957: Velocity distribution of lower level wind in Beijing.Acta Meteorologica Sinica,28(3), 185–197. (in Chinese)
Yang Tacheng, and Tseng Kwang, 1958: The influence of surface’s roughness upon the wind profile in the upper planetary boundary over Dalian.Acta Meteorologica Sinica,29(1), 1–6. (in Chinese)
Ye Duzheng, and Gao Youxi, 1979:Tibetan Plateau Meteorology. Beijing Science Press, 278 pp. (in Chinese)
Zhang Guangzhi, Xu Xiangde and Wang Jizhi, 2000: A Dynamic Study on PBL Characteristics by Using ’98 HUBEX and TIPEX Data.Proceedings of the 2nd Session of the International Workshop on TIPEX-GAME/Tibet, Kunming, China, 58–60.
Zhao Bolin, 1956: Turbulent exchange in the friction layer.Acta Meteorologica Sinica,27(3), 195–218. (in Chinese)
Zhao Ming, and Miao Manqian, 1992: Atmospheric Boundary Layer. Beijing: China Meteorological Press, 225 pp. (in Chinese)
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Zhang, G., Xu, X. & Wang, J. A dynamic study of Ekman characteristics by using 1998 SCSMEX and TIPEX boundary layer data. Adv. Atmos. Sci. 20, 349–356 (2003). https://doi.org/10.1007/BF02690793
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DOI: https://doi.org/10.1007/BF02690793