The Impact of Varying Environmental Conditions on the Spatial and Temporal Patterns of Orographic Precipitation over the Pacific Northwest near Portland, Oregon
The Impact of Varying Environmental Conditions on the Spatial and Temporal Patterns of Orographic Precipitation over the Pacific Northwest near Portland, Oregon
复制标题
变化的环境条件对俄勒冈州波特兰附近太平洋西北地区地形降水时空格局的影响
DOI：
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发表时间：
2011
期刊：
影响因子：
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通讯作者：
B. Colle
中科院分区：
文献类型：
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作者：
S. Yuter;David A. Stark;J. A. Crouch;M. J. Payne;B. Colle
摘要利用美国太平洋西北部俄勒冈州波特兰三个冬季（2003-06）的雷达资料，描述了中等宽度（~50 km半宽）的喀斯喀特山脉地形降水随跨障风速、0°C水平高度和稳定性的变化。地形增强是根据反射率（降水场）的位置、频率和相对强度来指定的。该地区的典型风暴，定义为第25至第75百分位数的特征，与风暴的第75百分位数的特征为一个给定的变量进行比较。波特兰地区大约有一半的风暴在相对狭窄的方位角范围内有低层风向。风暴的这一子集是用来检查相对于其他环境变量的地形增强的敏感性。跨障碍风速在确定降水频率的大小方面比0°C水平或稳定度具有更大的作用。跨障风…
AbstractOperational radar data from three winter seasons (2003–06) in Portland, Oregon, in the U.S. Pacific Northwest are used to describe how orographic precipitation varies with cross-barrier wind speed, 0°C level height, and stability over the moderately wide (~50-km half-width) Cascade Mountain Range. Orographic enhancement is specified in terms of location, frequency, and relative intensity of the reflectivity (precipitation field). The typical storm for the region, as defined by the 25th to 75th percentile characteristics, is compared to storms with 75th percentile characteristics for a given variable. About half of Portland-region storms have a low-level wind direction within a relatively narrow azimuth range. This subset of storms is used to examine the sensitivity of orographic enhancement relative to other environmental variables. Cross-barrier wind speed has a stronger role in determining the magnitude of precipitation frequency than either 0°C level or stability. Cross-barrier wind ...
影响因子：
3
作者：
M. Kunz;C. Kottmeier
通讯作者：
M. Kunz;C. Kottmeier