Summer Wind Flow Regimes over the Sacramento Valley
Summer Wind Flow Regimes over the Sacramento Valley
复制标题
萨克拉门托山谷夏季风流状况
DOI：
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发表时间：
1999
期刊：
影响因子：
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通讯作者：
J. Carroll
中科院分区：
文献类型：
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作者：
Laura L. Zaremba;J. Carroll
本研究利用条件采样，以确定三个频繁的风制度在较低的萨克拉门托山谷。分析了萨克拉门托河谷南部及周边地区各风场的主要气流特征。下午的风向在一个关键的观测点（戴维斯，CA）在中南部的山谷被用来分类制度南风（海洋空气入侵），北风（没有海洋空气入侵），和过渡风天。在1991年夏天，这些分别发生在72%，14%和14%的日子里。从21个地面观测站的每日数据分离的风制度，然后平均为季度的一天，产生风玫瑰按政权和一天中的时间分组。然后将这些数据标绘在一张底图上。每个风玫瑰图中最常见的方向被用来构建该地区的流线，每个政权的一天四分之一。这些分析提供了一个气候学的平均风流量的日变化，为这些频繁的流动制度，提供了风气候学更大的空间和时间分辨率比现存的出版物。这些分析对于评估空气污染物或污染物的传输模式特别有用。
This study utilized conditional sampling to identify three frequent wind regimes in the lower Sacramento Valley. The major flow features of the mean diurnal wind patterns in the southern Sacramento Valley and surrounding areas were analyzed for each wind regime. Afternoon wind directions at a pivotal observing site (Davis, CA) in the south-central part of the valley were used to classify the regimes as south wind (marine air intrusion), north wind (no marine air intrusion), and transitional wind days. In the summer of 1991, these occurred 72%, 14%, and 14% of the days, respectively. Daily data from 21 surface observing stations were segregated by wind regime, then averaged for quarters of the day to produce wind roses grouped by regime and time of day. These data were then plotted on a base map. The most frequent direction in each of these wind roses was used to construct streamlines for the area by quarter of the day for each regime. These analyses provide a climatology of the diurnal variation of the average wind flow for each of these frequent flow regimes, providing a wind climatology with greater spatial and temporal resolution than those in extant publications. These analyses are especially useful for evaluating transport patterns of air pollutants or contaminants.