摘要
采用大涡模拟所获的数据结果， 分析地面热通量沿平均风方向存在突变的条件下对流边界层的热量平衡和平流输送作用。分析表明边界层内模拟所得结果可以很好地满足热量平衡关系。除地面热通量项以外， 平流项（包括水平平流和垂直平流） 对边界层加热率的作用可达地面热通量不均匀性差值的大小， 是影响边界层内热量平衡的最重要因子， 平均速度散度项对热量平衡的作用也不可忽略， 但湍流通量散度项的作用则很小。
Data of large-eddy simulations are used to analyze heat budget and advection effects in convective boundary layers (CBL) which across a surface heat-flux discontinuity along average wind direction Results show that heat conservation equation is well balanced in CBL; besides the surface heat flux term, the advection, horizontally and vertically, also plays a most significant role in heat budget Contribution of advection to heating rate of CBL could achieve that of the net heat-flux difference between two sides of the surface discontinuity Contribution of divergence of average wind field is not negligible to heat budget, while that of turbulent flux divergence is quite small
出处
《大气科学》
CSCD
北大核心
2000年第1期95-102,共8页
Chinese Journal of Atmospheric Sciences
基金
国家自然科学基金!49405059 和49790020
关键词
对流边界层
热量平衡
平流
大涡模拟
平流输送
convective boundary layer
heat budget
advection
large-eddy simulation
