Error-growth dynamics and predictability of surface thermally induced atmospheric flow
Error-growth dynamics and predictability of surface thermally induced atmospheric flow
复制标题
表面热诱导大气流的误差增长动力学和可预测性
DOI：
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发表时间：
1993
期刊：
影响因子：
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通讯作者：
R. Pielke
中科院分区：
文献类型：
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作者：
X. Zeng;R. Pielke
本文利用CSU区域大气模式系统（RAMS）的非静力可压缩配置，在Δx = 2 km和Δx = 100 m的条件下，进行了200多个二维模拟，详细研究了地面热致环流的初始调整过程和误差增长动力学，包括对初始条件的敏感性（即，传统的可预报性），边界条件和模式参数，并研究了可预报性作为一个平静的平均风下的地面加热片的大小的函数。结果发现，误差增长（至少在地面强迫较强的阶段）对初始扰动的特性不敏感。数值平滑对初始调整过程和误差增长动态有很大影响。可预测性是变量相关的。中尺度流动对侧边界和顶边界条件不敏感。在关于边界层影响的结论中…
Abstract Using the CSU Regional Atmospheric Modeling System (RAMS) in its nonhydrostatic and compressible configuration, over 200 two-dimensional simulations with Δx = 2 km and Δx = 100 m are performed to study in detail the initial adjustment process and the error-growth dynamics of surface thermally induced circulations including the sensitivity to initial conditions (i.e., the traditional predictability), boundary conditions, and model parameters, and to study the predictability as a function of the size of surface heat patches under a calm mean wind. It is found that the error growth (at least at the stage when the surface forcing is strong) is not sensitive to the characteristics of the initial perturbations. The numerical smoothing has a strong impact on the initial adjustment process and on the error-growth dynamics. The predictability is variable dependent. The mesoscale flow is insensitive to lateral and top boundary conditions. Among the conclusions regarding the influence of the boundary-layer ...