The scale dependence and structure of convergence fields preceding the initiation of deep convection

The scale dependence and structure of convergence fields preceding the initiation of deep convection
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深对流启动前的收敛场的尺度依赖性和结构

DOI:
10.1002/2014gl060493
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发表时间:
2014
影响因子:
5.2
通讯作者:
Birch C
Birch C
中科院分区:
地球科学1区
文献类型:
--
作者:
Birch C

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在全球模式中,辐合和对流之间的联系很差,对流的代表性差是热带地区许多模式偏差的来源。最先进的对流允许模拟使我们能够统计分析真实的对流。分形维数的分析表明,在对流允许的模拟(网格间距1.5,4,和12公里)的西非季风,50%的深对流启动发生在附近的低层边界层辐合线,定向沿着平均风。在这些模拟中,超过80%的初始发生在大尺度(300 × 300 km)收敛中,约20%发生在大尺度发散中,几乎所有情况都发生在局部尺度(60 × 60 km)收敛中。在对流方案和12 km网格间距的模拟中,这种行为发生了变化;在收敛线上,初始化频率较低,并且对高量级低层局部收敛的依赖性较低。
Links between convergence and convection are poor in global models, and poor representation of convection is the source of many model biases in the tropics. State‐of‐the‐art convection‐permitting simulations allow us to analyze realistic convection statistically. The analysis of fractal dimension is used to show that in convection‐permitting simulations (grid spacings 1.5, 4, and 12 km) of the West African monsoon, 50% of deep convective initiations occur in the near vicinity of low‐level boundary layer convergence lines that are orientated along the mean wind. In these simulations, more than 80% of the initiations occur within large‐scale (300 × 300 km) convergence, with some 20% in large‐scale divergence, and almost all cases occur within local scale (60 × 60 km) convergence. The behavior alters in a simulation with a convection scheme and a grid spacing of 12 km; initiation is less frequent over convergence lines, and there is less dependency on high‐magnitude low‐level local convergence.
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影响因子: 8.9
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