Deformation Feature of a Continuous Sea Fog Process over the Yellow Sea and Bohai Sea and Its Genesis Analysis
During 3-5 March 2016, a large range of sea fog continuously occurred over most areas of the Yellow Sea and Bohai Sea. In this article, satellite remote sensing monitoring data are used to analyze the morphological variation of the sea fog event during the three stages of generation, development and extinction, and also the lack of sea fog over southeast coast of Shandong Peninsula and the causes for the evolution of the sea fog this time are discussed. The results show that (1) in the early stage of the sea fog formation, there was no sea fog under the southerly wind on the southeast coast of Shandong Peninsula as a result of weak cyclone, instability of atmospheric stratification, and low humidity. Affected by low pressure, no water vapor converged. (2) During the mature period of the sea fog, the air temperature was lower than that on the sea surface. This condition was caused by the longwave radiation from the top of the fog within the 0-1℃ temperature difference between the air and sea surface. The southerly heating low air from the Northwest Pacific Ocean was beneficial to the formation of sea fog. The water vapor convergence was monitored obviously in this area. (3) The effect of vertical wind shear especially from 925 hPa to 1000 hPa was positive to the maintenance of inversion layer and the development of vertical height of the sea fog, eventually forming the typical sea fog with the certain thickness.