The influence of microphysics in the formation of intense wake lows : A numerical modeling study
The influence of microphysics in the formation of intense wake lows : A numerical modeling study
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微物理对强烈尾流低压形成的影响：数值模拟研究
DOI：
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发表时间：
1996
期刊：
影响因子：
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通讯作者：
W. Gallus
中科院分区：
文献类型：
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作者：
W. Gallus
摘要本文利用一个二维云模式研究了中尺度对流系统层状雨区内的微物理过程是否能引起强下降和强烈的地面尾流低压。理想化的模拟运行的域，捕获的层状雨区域的后边缘。一个简化的微物理场，代表雪单独，规定内的层状云产生类似的雷达反射率观测。当规定的雪场被假定为与时间无关时，强烈的沉降发展，但不会引起强烈的尾流低，因为微物理冷却强烈反对绝热变暖。简单地增加雪量，虽然会导致更大的降雨率和更强的沉降，但不会产生明显的压力福尔斯。然而，当降水率规定随时间而减少，可能会发生与塌陷的降水核心，沉降引起更大的压力下降福尔斯，和一个...
Abstract A two-dimensional cloud model is used to investigate whether microphysical processes alone within the stratiform rain regions of mesoscale convection systems can induce strong descent and intense surface wake lows accompanying such systems. Idealized simulations are run with a domain that captures the back edge of the stratiform rain region. A simplified microphysical field, representing snow alone, is prescribed within the stratiform cloud to produce radar reflectivities similar to observations. When the prescribed snow field is assumed time-independent, strong subsidence develops but does not induce an intense wake low since microphysical cooling strongly opposes adiabatic warming. Simply increasing snow quantities, although resulting in heavier rain rates and stronger subsidence, does not produce significant pressure falls. However, when precipitation rates are prescribed to decrease with time as might occur with collapsing precipitation cores, subsidence induces greater pressure falls, and a ...