Why Does Deep Convection Have Different Sensitivities to Temperature Perturbations in the Lower versus Upper Troposphere?
Why Does Deep Convection Have Different Sensitivities to Temperature Perturbations in the Lower versus Upper Troposphere?
复制标题
为什么对流层下层和高层的深对流对温度扰动的敏感性不同？
DOI：
10.1175/jas-d-18-0023.1
复制
发表时间：
2019
影响因子：
3.1
通讯作者：
Kuang, Zhiming
中科院分区：
文献类型：
--
作者：
Tian, Yang;Kuang, Zhiming
先前的研究已经证明，深层对流对下层对流层云底之上的温度扰动的反应比对流层上层的温度扰动更强烈，这种行为对大规模潮湿流动的动力学很重要，比如对流耦合波。许多因素可能导致这种不同的敏感性，包括对流层下层和上层云上升气流中浮力、垂直速度和/或液态水含量的差异。量化这些因素的贡献有助于指导对流参数化方案的发展。我们通过在线性响应框架内跟踪嵌入云解析模拟中的拉格朗日粒子来解决这个问题。结果表明，上升气流浮力和垂直速度的差异对气流的影响都很显著，其中垂直速度的影响更为重要，而液态水含量的影响相对于其他两个因素而言只是次要的。这些结果表明，在对流参数化方案中，云上升气流垂直速度需要正确地模拟，以便适当地考虑在自由对流层不同高度对流对温度扰动的不同敏感性。
Previous studies have documented that deep convection responds more strongly to above-the-cloud-base temperature perturbations in the lower troposphere than to those in the upper troposphere, a behavior that is important to the dynamics of large-scale moist flows, such as convectively coupled waves. A number of factors may contribute to this differing sensitivity, including differences in buoyancy, vertical velocity, and/or liquid water content in cloud updrafts in the lower versus upper troposphere. Quantifying the contributions from these factors can help to guide the development of convective parameterization schemes. We tackle this issue by tracking Lagrangian particles embedded in cloud-resolving simulations within a linear response framework. The results show that both the differences in updraft buoyancy and vertical velocity play a significant role, with the vertical velocity being the more important, and the effect of liquid water content is only secondary compared to the other two factors. These results indicate that cloud updraft vertical velocities need to be correctly modeled in convective parameterization schemes in order to properly account for the differing convective sensitivities to temperature perturbations at different heights of the free troposphere.
辐射对流平衡模拟对水平分辨率的敏感性
DOI：
--
发表时间：
2006
期刊：
影响因子：
--
作者：
O. Pauluis;S. Garner
通讯作者：
S. Garner
具有状态相关夹带率的积云参数化。
影响因子：
3.1
作者：
M. Chikira;M. Sugiyama
通讯作者：
M. Sugiyama
模拟积云系综的宏观夹带过程。
DOI：
--
发表时间：
1997
期刊：
影响因子：
--
作者：
Chichung Lin;A. Arakawa
通讯作者：
A. Arakawa