Orographic Precipitation and Oregon’s Climate Transition
Orographic Precipitation and Oregon’s Climate Transition
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地形降水和俄勒冈州的气候转变
DOI：
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
Laurent Bonneau
中科院分区：
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作者：
Ronald B. Smith;I. Barstad;Laurent Bonneau
摘要俄勒冈州的急剧东-西气候转变进行了研究，使用地形降水的线性模型和四个数据集：（a）内插的年雨量计数据，（B）卫星派生的降水代理（植被和亮温），（c）小流域的径流数据，和（d）稳定同位素分析的水样流。线性模型对这些数据集的成功表明，模型的主要元素（即，气流动力学、云时间延迟、凝结水平流和背风蒸发）的表现是合理的，尽管俄勒冈州的高地形可能使线性理论超出其适用范围。线性模式中的一个关键参数是云延迟时间（τ），它包含了地形云过程的作用。检查每个数据集以查看其是否可以约束τ值。从雨量计和卫星观测得到的全州范围内的降水模式将τ值限制在500 ~ 5000 s的范围内。A fo.
Abstract Oregon’s sharp east–west climate transition was investigated using a linear model of orographic precipitation and four datasets: (a) interpolated annual rain gauge data, (b) satellite-derived precipitation proxies (vegetation and brightness temperature), (c) streamflow data for a small catchment, and (d) stable isotope analysis of water samples from streams. The success of the linear model against these datasets suggests that the main elements of the model (i.e., airflow dynamics, cloud time delays, condensed water advection, and leeside evaporation) are behaving reasonably, although the high Oregon terrain may push the linear theory beyond its range of applicability. A key parameter in the linear model is the cloud delay time (τ), encapsulating the action of orographic cloud processes. Each dataset was examined to see if it can constrain the τ values. The statewide precipitation patterns from rain gauge and satellite constrain the τ values only within a broad range from about 500 to 5000 s. A fo...