Numerical Investigation of Mesoscale Circulations over the Los Angeles Basin. Part I. A Verification Study
Numerical Investigation of Mesoscale Circulations over the Los Angeles Basin. Part I. A Verification Study
复制标题
洛杉矶盆地中尺度环流的数值研究。
DOI：
10.1175/1520-0493(1990)118
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发表时间：
1990
影响因子：
3.2
通讯作者：
C. Mass
中科院分区：
文献类型：
--
作者：
Brian L. Ulrickson;C. Mass
本文描述了对科罗拉多州立大学中尺度模式的一些改进，并对该模式在模拟洛杉矶盆地气流中的精度进行了评估。模型的输出与在两个气象不同的日子进行的观测进行了比较。用Willmott统计方法对预报的地面风进行了评估。该模型在模拟风方面大体上是准确的，但未能复制从洛杉矶到圣费尔南多山谷的观测到的东南风。模拟的地面风在白天比在夜间更准确，因为该模型没有再现夜间风的空间变异性。该模式很好地预报了混合高度，这是预测污染物浓度的一个重要变量，并成功地复制了白天观测到的风和位温的边界层平均。
Abstract This paper describes some improvements to the Colorado State University mesoscale model and the evaluation of the model's accuracy in simulating airflows in the Los Angeles Basin. Model output was compared with observations taken on two meteorologically distinct days. The statistical method of Willmott was used to evaluate the predicted surface winds. The model was generally accurate in simulating the winds, but failed to replicate the observed southeasterly flow from Los Angeles into the San Fernando Valley. The simulated surface winds were snore accurate during the daytime than during the night, since the model did not reproduce the nocturnal winds' spatial variability. The model is a good predictor of mixing heights, which is an important variable in predicting pollutant concentrations, and successfully replicated observed daytime boundary layer averages of wind and potential temperature.