用中尺度数值模式 ＭＭ５对 １９９９年 １１月 ２４日烟台附近发生重大海难事故的渤海风场进行了数值模 拟，探讨了该次冷锋大风的风场特征和影响机制．结果表明：用９０ｋｍ的粗网格可以成功地模拟地面冷高压 与锋面的发展和移动，以及高空环流形势的演变．而通过３０ｋｍ细网格的模拟发现，在冷锋后的行星边界层 中．存在着一条宽度为 ２００ ｋｉｎ的中尺度强风带，最大风速位于 ９２５ｈＰａ，它与高空的极锋急流并不相连；细 网格还模拟出了渤海中尺度低压的发展过程，它使近地面层大风的强度显著加强．模拟还表明，海陆差异对 近地面的风场分布有重要的影响，强风带移入渤海后，在渤海海域形成一个 ２００—３００ ｋｍ的中尺度强风 区．因此，采用具有较高分辨率的中尺度数值模式，对提高渤海大风的预报水平，避兔海难事故的发生更具 有重要意义． The mesoscale numerical model MM5 was used to numerically simulate the Bohai Sea wind field near Yantai on November 24, 1999, and to discuss the wind field characteristics and mechanism of the gale cold wind. The results show that the 90 km coarse grid can successfully simulate the development and movement of the cold surface and the front of the ground and the evolution of the situation of the upper atmosphere circulation. A simulation of a 30 km fine grid found that in the planetary boundary layer behind the cold front. There is a 200 kin medium-sized strong wind belt with a maximum wind speed of 925 hPa, which is not connected to the high-polar polar front jet. The fine grid also simulates the development of the Mesozoic low pressure in the Bohai Sea, which makes the near-surface gale The intensity is significantly enhanced. The simulation also shows that the difference between the land and sea has an important influence on the wind field distribution near the ground. After the strong wind belt moves into the Bohai Sea, a 200-300 km strong meso-scale wind region is formed in the Bohai Sea. Therefore, adopting the mesoscale numerical model with higher resolution is more important to improve the forecast level of the gale in the Bohai Sea and avoid the occurrence of marine accidents.