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首页> 外文期刊>Journal of the Atmospheric Sciences >Response of Atmospheric Convection to Vertical Wind Shear: Cloud-System-Resolving Simulations with Parameterized Large-Scale Circulation. Part II: Effect of Interactive Radiation
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Response of Atmospheric Convection to Vertical Wind Shear: Cloud-System-Resolving Simulations with Parameterized Large-Scale Circulation. Part II: Effect of Interactive Radiation

机译：大气对流对垂直风切变的响应：带参数化大规模环流的云系统解析模拟。第二部分：互动辐射的影响

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摘要

The authors investigate the effects of cloud-radiation interaction and vertical wind shear on convective ensembles interacting with large-scale dynamics in cloud-resolving model simulations, with the large-scale circulation parameterized using the weak temperature gradient approximation. Numerical experiments with interactive radiation are conducted with imposed surface heat fluxes constant in space and time, an idealized lower boundary condition that prevents wind-evaporation feedback. Each simulation with interactive radiation is compared to a simulation in which the radiative heating profile is held constant in the horizontal and in time and is equal to the horizontal-mean profile from the interactive-radiation simulation with the same vertical shear profile and surface fluxes. Interactive radiation is found to reduce mean precipitation in all cases. The magnitude of the reduction is nearly independent of the vertical wind shear but increases with surface fluxes. Deep shear also reduces precipitation, though by approximately the same amount with or without interactive radiation. The reductions in precipitation due to either interactive radiation or deep shear are associated with strong large-scale ascent in the upper troposphere, which more strongly exports moist static energy and is quantified by a larger normalized gross moist stability.
机译：作者研究了云-辐射相互作用和垂直风切变对对流集合体相互作用的影响，这些对流集合体在云解析模型模拟中具有大的动力学相互作用，其中大尺度环流使用弱温度梯度近似参数化。进行了具有交互式辐射的数值实验，其中施加的表面热通量在空间和时间上恒定，这是一种理想的下边界条件，可防止风蒸发反馈。将每个具有交互式辐射的模拟与一个模拟进行比较，在该模拟中，辐射加热曲线在水平和时间上保持恒定，并且等于交互式辐射模拟中具有相同垂直剪切剖面和表面通量的水平平均剖面。发现在所有情况下交互式辐射都可以减少平均降水。减少的幅度几乎与垂直风切变无关，但随表面通量增加。深切变也可减少降水，尽管有或没有互动辐射时降水量大致相同。由相互作用辐射或深切变引起的降水减少与对流层上层的大规模大规模上升有关，后者更强烈地输出了湿静能量，并通过更大的归一化总湿润稳定性来量化。

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