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首页> 外文期刊>Journal of the Atmospheric Sciences >A parameterization for the triggering of landscape-generated moist convection. part I: Analysis of high-resolution model results
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A parameterization for the triggering of landscape-generated moist convection. part I: Analysis of high-resolution model results

机译：用于触发景观生成的湿对流的参数化。第一部分：高分辨率模型结果分析

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To develop a parameterization for the triggering of moist convection by landscape-generated mesoscale circulations, a set of relatively high-resolution three-dimensional (3D) simulations was produced. These simulations modeled the development of landscape generated mesoscale circulations that triggered moist convection over west-to-east dry patches. No clear relationship existed between average patch size and average rainfall. Rather, rainfall averaged over the area of individual patches varied linearly with the size of these patches. Thus, cumulus parameterization schemes need to account for a population of clouds (over individual patches) within each domain of a large-scale atmospheric model (i.e., numerical weather prediction and global circulation models). It is demonstrated that mesoscale perturbations in velocity, temperature, and moisture need to be included in triggering functions when evaluating whether moist convection will occur. Yet, the largest patches did not always produce the largest mesoscale perturbations. Instead, the size of the perturbations depended upon the ratio of the local radius of deformation to patch size, the gradient of soil moisture between patches, as well as large-scale environmental conditions such as wind, stability, and specific humidity. These perturbations can be used to improve the representation of triggering functions associated with moist convection over landscape patches. Appropriate dimensionless numbers that can be used in a parameterization for the mesoscale perturbations are identified. [References: 51]
机译：为了开发由景观产生的中尺度环流触发湿对流的参数化，产生了一组相对高分辨率的三维（3D）模拟。这些模拟模拟了景观产生的中尺度环流的发展，这些环流在西向东的干燥斑块上引发了对流。平均斑块大小与平均降雨量之间没有明确的关系。相反，各个斑块区域的平均降雨量随这些斑块的大小线性变化。因此，累积参数化方案需要考虑大规模大气模型（即，数值天气预报和全球环流模型）的每个域内（单个补丁上的）云的总数。结果表明，在评估是否会发生湿对流时，在触发函数中需要包括速度，温度和湿度的中尺度扰动。然而，最大的斑块并不总是产生最大的中尺度扰动。取而代之的是，扰动的大小取决于局部变形半径与斑块大小的比率，斑块之间土壤湿度的梯度以及诸如风，稳定性和比湿度等大规模环境条件。这些扰动可用于改善与景观斑块上湿对流相关的触发功能的表示。确定了可以在参数化中用于中尺度微扰的适当的无量纲数。 [参考：51]

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