摘要
将海洋飞沫参数化引入到高分辨率、非静力中尺度模式中,并对0908号台风"Morakot"进行了数值模拟,研究了海洋飞沫对台风"Morakot"结构和强度的影响。结果表明:(1)不论是否考虑海洋飞沫作用,模式均能较好地模拟出台风"Morakot"的移动路径,说明海洋飞沫对其移动路径影响不大;(2)引入海洋飞沫参数化后,台风眼墙区域的切向风速、径向风速、垂直速度、涡度、云水混合比、雨水混合比等物理量均增强,表明飞沫对台风结构变化的影响明显;(3)海洋飞沫对台风"Morakot"演变的直接影响是在对流层低层,低层风速明显增大,大风速区的影响尤为显著;(4)飞沫的蒸发使台风范围内的潜热和感热通量明显增强,尤其是潜热通量,其大值区对应着台风中心附近的最大风速区。由于水汽和热量输送的增强,使台风眼壁附近的云水量与雨水量增多,因此降水强度明显增加。
A sea spray flux parameterization scheme is included within a non-hydrostatic meso-scale model WRF（weather research and forecasting）.Typhoon ＇Morakot＇ was simulated using the coupled atmosphere-sea spray model to study the effect of sea spray on structure and intensity of the typhoon.The results demonstrate that,regardless of whether sea spray flux parameterization is included or not,the model can always simulated the track well,indicating that the sea spray has little impact on its track.If taking into account of sea spray flux in the model,the tangential,radial,and vertical wind,vorticity,cloud water mixing ratio and rain water mixing ratio are all increased,showing a clear effect of sea spray on structure evolution of ＇Morakot＇.The largest effect of sea spray is in the lower troposphere with significant increase in low level wind speed,especially within strong wind zone.The evaporation of sea spray lead to a significant increase of heat flux in the air-sea interface,particularly,the latent heat flux and the area with high latent heat flux is corresponding to the maximum wind speed near the typhoon center.Due to enhancement of water vapor and heat fluxes,cloud water and rain water around typhoon eye are increased in the sea spray experiment,which is closely associated with more precipitation.
出处
《高原气象》
CSCD
北大核心
2012年第1期113-125,共13页
Plateau Meteorology
基金
国家自然科学基金项目(40921160381
40875039)
国家科技支撑项目"持续性异常气象事件预测业务技术研究"(2009BAC51B03)共同资助
