摘要
利用广东博贺离海岸6km的一个海上100m铁塔观测到的梯度资料,采用特征量分析方法,研究强冷空气过程海洋近地层强风的微观特征。结果表明:冷锋过境时,近地层的气象要素有明显的响应:温度骤降、风速加大、气压上升,风向有明显的转变;风向标准差和风速标准差在冷锋前、冷锋过境和冷锋后都有明显不同;冷锋过境大风湍流度为0.08,阵风系数为1.19;此次冷锋过境强风在时间上表现为周期0.5～1h的低频阵性;在空间上,60m附近存在近地层的最大风层。
Based on gradient data from a 100-meter maritime tower 6 km off the coast of Bohe, Guangdong, the microcosmic characteristics of strong wind near the ocean surface layer during a strong cold air process are studied by analyzing the characteristic quantities. It is found that the meteorological elements have noticeable response to the passage of the cold front with fast fall in temperature, increase in wind speed and air pressure and sharp change in wind direction. The standard deviation of wind direction and speed are very different before, during and after the cold front. The turbulence intensity of high wind during the passage of the strong cold air process is 0.08 and the gust factor is 1.19. The strong wind shows a low-frequency gustiness of 0.5 - 1 h and maximum speed at an altitude of 60 m.
出处
《热带气象学报》
CSCD
北大核心
2009年第5期635-640,共6页
Journal of Tropical Meteorology
基金
国家自然科学基金重点项目(90715031)
国家基金项目(40775071
40875007)共同资助
关键词
海面近地层
强风特征
强冷空气过程
广东博贺
near ocean surface layer
characteristics of strong wind
strong cold air process
Bohe Guangdong
