Abstract
After the passage of a cold front, spring in northern China, the outbreak of strong wind is often accompanied by dust emissions. Through analyses of data in the atmospheric boundary layer during a typical case, it is revealed there are rather regular gust wave packets superimposed on the basic strong wind flow. The gust-wind wave packets have a period equal to around 3–6 mins and possess coherent structure. As the vertical transport of momentum is decomposed into separate parts by (a) basic flow, (b) gust-wind, and (c) turbulence, they are all in a downwards direction at the lower levels of the atmospheric boundary layer during strong wind periods. However, (a) is the largest, while (b) and (c) are comparable. All these are very different from the case of normal weather. Besides, the friction velocity at the ground surface is also much larger than that of normal weather and should be corrected by taking the contributions of the basic flow and gust-wind into account. The strong basic flow with descending motion is very favorable for soil erosion and sand/dust emissions, but suppresses the entrainment of dust particles by keeping them within the bottom levels of the atmospheric boundary layer. Owing to the coherent structure of gust-wind, dust particles can effectively overcome the systematic descending air motion and penetrate into the middle and upper levels of the atmospheric boundary layer, and then propagate further and diffuse into the troposphere where ascending air motion prevails.
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References
Alfaro, S. C., A. Gandichet, L. Gomes, and M. Mailler, 1998: Mineral aerosol production by wind erosion: Aerosol particle sizes and binding energies. Geophys. Res. Lett., 25(7), 991–994.
Bagnold, R. A., 1941: The Physics of Blown Sand and Desert Dunes. Methum, London, UK, 265pp.
Cheng, X. L., Q. C. Zeng, F. Hu, and Z. Peng, 2007: Gustiness and coherent structure of strong wind in the atmospheric boundary layer. Climatic and Environmental Research, 12(3), 227–243. (in Chinese)
Dong, F., D. Y. Liu, and D. L. He, 1995: Advances and tendency in understanding of wind-blown sand motion. Advances in Mechanics, 25, 368–389. (in Chinese)
Fecan, F., B. Marticorena, and G. Bergametti, 1999: Parameterization of the increase of the aeolian erosion threshold wind friction velocity due to soil moisture for arid and seam-arid areas. Ann. Geophys., 17(2), 149–157.
Gillette, D. A., 1981: Production of dust that may be carried great distances. Special Paper-Geological Society of America, 186, 11–26.
He, D. L., and Y. G. Gao, 1988: The study of sand saltation movement by high speed photograph. Journal of Desert Research, 8(1), 18–29. (in Chinese)
Hu, Y. Q., and Y. Mitsuta, 1996: Development of the strong dust storm and dry squall line-A mechanism analysis on generating black storm. Plateau Meteorology, 15(2), 178–185. (in Chinese)
Hu, Y. Q., and Y. Mitsuta, 1997: Micrometeorological characteristics and local triggering mechanism of strong dust storm. Scientia Atmospheirca Sinica, 21(5), 581–589. (in Chinese)
Hua, L., and Y. P. Shao, 2001: Toward quantitative prediction of dust storms: An integrated wind erosion modeling system and its applications. Environmental Modeling & Software, 16, 233–249.
Liu, X. H., and Z. X. Hong, 1996: A study of the structure of a strong wind event in the atmospheric boundary layer in Belting area. Chinese J. Atmos. Sci., 20(2), 223–228. (in Chinese)
Qian, W. H., L. S. Quan, and S. Y. Shi, 2002: Variations of the dust storm in China and its climatic control. J. Climate, 15, 1216–1228.
Raupach, M. R., D. A. Gillette, and J. F. Leys, 1993: The effect of roughness elements on wind erosion threshold. J. Geophys. Res., 98, 3023–3029.
Ren, Z. H., Q. X. Gao, F. Q. Su, Y. T. Wang, Z. Zhang, and X. Yang, 2003: The regional characteristics of the atmospheric environment and theimpact of duststorm in Beijing. Engineering Science, 5(2), 49–56. (in Chinese)
Shao, Y. P., 2000: Physics and Modeling of Wind Erosion. Kluwer Academic Publishers, Dordrecht/Boston/London, 393pp.
Shao, Y. P., 2001: A model for mineral dust emission. J. Geophys. Res., 106(D17), 20239–20254.
Shao, Y. P., and L. M. Leslie, 1997: Wind erosion prediction over the Australian continent. J. Geophys. Res., 102, 30091–30105.
Shao, Y. P., and H. A. Lu, 2000: Simple expression for wind erosion threshold friction velocity. J. Geophys. Res., 105(D17), 22437–22443.
Sun, J. H., L. N. Zhao, and S. X. Zhao, 2003: All integrated numerical modeling system of dust storm suitable to North China and its applications. Climatic and Environmental Research, 8(2), 125–142. (in Chinese)
Tegen, I., and I. Fung, 1994: Modeling of mineral dust in the atmosphere: Sources, transport, and optical thickness. J. Geophys. Res., 99, 22897–22914.
Zeng, Q. C., and Coauthors, 2006: Gigantic Yellow Cloud-The Dust Storm in Eastern Asia. Science Press, Beijing, 228pp.
Zeng, Q. C., X. L. Cheng, and F. Hu, 2007a: The mechanism of soil erosion and dust emission under the action of nonsteady strong wind with descending motion and gust wind. Climatic and Environmental Research, 12(3), 244–250. (in Chinese)
Zeng, Q. C., F. Hu, and X. L. Cheng, 2007b: The mechanism of dust entrainment by gustwind. Climatic and Environmental Research, 12(3), 251–255. (in Chinese)
Zhao, L. N., J. H. Sun, and S. X. Zhao, 2002a: Numerical simulation of dust emission in North China. Climatic and Environmental Research, 7(3), 279–294. (in Chinese)
Zhao, L. N., J. H. Sun, and S. X. Zhao, 2002b: Numerical simulation of dust emission in North China. Climatic and Environmental Research, 7(3), 279–294. (in Chinese)
Zhang, R. J., G. Y. Shi, Y. Kanai, A. Ohta, Y. F. Xu, Y. B. Gong, and H. S. Chen, 2002: TSP mass concentration and number concentration of particles in dust storm weather in 2002 spring in Beijing. The Chinese Journal of Process Engineering, 2(Suppl.), 289–292. (in Chinese)
Zhang, R. J., R. Arimoto, J. L. An, S. Yabuki, and J. H. Sun, 2005: Ground observation of an intense dust storm in Beijing in March 2002. J. Geophys. Res., 110(D18S06), doi: 10.1029/2004JD004589.
Zheng, X. J., and P. Wang, 2006: Numerical simulation on stochastic movement of sands in wind-blown sand. Journal of Desert Research, 26(2), 184–188. (in Chinese)
Zheng, X. J., L. Xie, and X. Y. Zou, 2006: Theoretical prediction of liftoff angular velocity distributions of sand particles in windblown sand flux. J. Geophys. Res., 111, D1109.
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Zeng, Q., Cheng, X., Hu, F. et al. Gustiness and coherent structure of strong winds and their role in dust emission and entrainment. Adv. Atmos. Sci. 27, 1–13 (2010). https://doi.org/10.1007/s00376-009-8207-3
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DOI: https://doi.org/10.1007/s00376-009-8207-3