以梧桐山山脉为分界点,利用山顶及其东西两侧区域自动站探测的常规分钟气象观测资料和香港海表温度观测资料,对2016年1月21—24日广东珠三角地区寒潮过程对深圳沿海地区的局地性天气影响进行分析。结果表明:(1)气温:山顶>西侧>东...以梧桐山山脉为分界点,利用山顶及其东西两侧区域自动站探测的常规分钟气象观测资料和香港海表温度观测资料,对2016年1月21—24日广东珠三角地区寒潮过程对深圳沿海地区的局地性天气影响进行分析。结果表明:(1)气温:山顶>西侧>东侧。(2)气压:强冷空气入侵期间,海平面气压48 h内升高20.6 h Pa,同时东西侧站点海平面气压差有明显日变化,夜间气压差大,白天(尤其午后)气压差减小。(3)风速:可能由于山风和陆风叠加效应,北风阵风达到32.1 m/s(11级),并且东侧>山顶>西侧,这种局地性天气与台风天气过程的风力分布有明显的差异。展开更多
A two-dimensional nonlinear PBL numerical model using an energy closure (E-ε)method has been employed to study the sea breeze circulation and TIBL in coastal areas. The main characteristics of sea breeze obtained fro...A two-dimensional nonlinear PBL numerical model using an energy closure (E-ε)method has been employed to study the sea breeze circulation and TIBL in coastal areas. The main characteristics of sea breeze obtained from numerical experiments agree with those from general observation facts. The depth of sea breeze ranges from 300 to 900 meters, maximum velocity from 1,5 m/s to 4 m/s, and its height from 100 m to 300 m. The agreement between comparisons reveals that the performance of the model is good, and the selected experiment conditions are reasonable. This paper refits the function of TIBL profiles using the Weisman’s formula and the exponent value is considered to change with the different states of sea breeze. Numerical experiment results indicate that the exponent of the TIBL profile, ranging from 0.4 to 1. 1, is related to the strength and depth of the sea breeze. The exponent of 0.5 is suitable only when sea breeze is fully developed. This paper also gives various exponents under different sea breezes.展开更多
文摘以梧桐山山脉为分界点,利用山顶及其东西两侧区域自动站探测的常规分钟气象观测资料和香港海表温度观测资料,对2016年1月21—24日广东珠三角地区寒潮过程对深圳沿海地区的局地性天气影响进行分析。结果表明:(1)气温:山顶>西侧>东侧。(2)气压:强冷空气入侵期间,海平面气压48 h内升高20.6 h Pa,同时东西侧站点海平面气压差有明显日变化,夜间气压差大,白天(尤其午后)气压差减小。(3)风速:可能由于山风和陆风叠加效应,北风阵风达到32.1 m/s(11级),并且东侧>山顶>西侧,这种局地性天气与台风天气过程的风力分布有明显的差异。
文摘A two-dimensional nonlinear PBL numerical model using an energy closure (E-ε)method has been employed to study the sea breeze circulation and TIBL in coastal areas. The main characteristics of sea breeze obtained from numerical experiments agree with those from general observation facts. The depth of sea breeze ranges from 300 to 900 meters, maximum velocity from 1,5 m/s to 4 m/s, and its height from 100 m to 300 m. The agreement between comparisons reveals that the performance of the model is good, and the selected experiment conditions are reasonable. This paper refits the function of TIBL profiles using the Weisman’s formula and the exponent value is considered to change with the different states of sea breeze. Numerical experiment results indicate that the exponent of the TIBL profile, ranging from 0.4 to 1. 1, is related to the strength and depth of the sea breeze. The exponent of 0.5 is suitable only when sea breeze is fully developed. This paper also gives various exponents under different sea breezes.
