[Objective] The aim was to discuss the formation, duration and disappearance of fog. [Method] Based on the weather data and physics of Liaoning Province, and considering the continuous 4 foggy days in 11 places in Lia...[Objective] The aim was to discuss the formation, duration and disappearance of fog. [Method] Based on the weather data and physics of Liaoning Province, and considering the continuous 4 foggy days in 11 places in Liaoning from November 29 to December 2, 2009, detailed analysis of this consecutive foggy days was given proceeding from the weather situation, element characteristics, especially the occurrence, duration and disappearance of dense fog. [Result] This dense fog was because that Liaoning was in the saddle pressure field. The weak cold air divergence set the ground in many weak mild scale convergence areas. The high temperature in the early time resulted in melting snow and long duration of dense fog days, along with radiation low temperature and southwest convergence transmission. In the meantime, because of the existence of small wind speed and existence of upper inversion temperature layer, it was inconvenient for the divergence of wet air; in addition, there was dense fog in north China. The upper southwest airstream transmitted wet air in the north China to the air of Liaoning, increasing the intensity of dense fog in Liaoning. [Conclusion] The study offered reference for the further forecast of air pollution.展开更多
文摘[Objective] The aim was to discuss the formation, duration and disappearance of fog. [Method] Based on the weather data and physics of Liaoning Province, and considering the continuous 4 foggy days in 11 places in Liaoning from November 29 to December 2, 2009, detailed analysis of this consecutive foggy days was given proceeding from the weather situation, element characteristics, especially the occurrence, duration and disappearance of dense fog. [Result] This dense fog was because that Liaoning was in the saddle pressure field. The weak cold air divergence set the ground in many weak mild scale convergence areas. The high temperature in the early time resulted in melting snow and long duration of dense fog days, along with radiation low temperature and southwest convergence transmission. In the meantime, because of the existence of small wind speed and existence of upper inversion temperature layer, it was inconvenient for the divergence of wet air; in addition, there was dense fog in north China. The upper southwest airstream transmitted wet air in the north China to the air of Liaoning, increasing the intensity of dense fog in Liaoning. [Conclusion] The study offered reference for the further forecast of air pollution.
