The Impacts of California’s San Francisco Bay Area Gap on Precipitation Observed in the Sierra Nevada during HMT and CalWater
The Impacts of California’s San Francisco Bay Area Gap on Precipitation Observed in the Sierra Nevada during HMT and CalWater
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DOI：
10.1175/jhm-d-14-0160.1
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发表时间：
2015-05
影响因子：
3.8
通讯作者：
Allen B. White;P. Neiman;J. Creamean;Timothy Coleman;F. M. Ralph;K. Prather
中科院分区：
文献类型：
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作者：
Allen B. White;P. Neiman;J. Creamean;Timothy Coleman;F. M. Ralph;K. Prather
摘要
大气河（ARs）是水汽输送增强的狭窄区域，通常位于主要在海洋上形成的许多中纬度风暴的极地冷锋的暖区一侧。非亮带（NBB）降雨是一种由碰撞和聚并驱动的浅薄地形降雨过程，在其中一些风暴中已被观测到。在北加利福尼亚的一个沿海山区站点，非亮带降雨平均约占冬季总降雨量的三分之一。在加利福尼亚能源委员会的CalWater项目期间，在内华达山脉北部山麓站点观测到的非亮带降雨比例与沿海山区几乎相同，而在内华达山脉南部山麓站点观测到的非亮带降雨比例不到一半。内华达山脉的这两个站点在冬季风暴登陆期间经常经历地形诱导的阻塞流，即塞拉屏障急流（SBJ）。然而，内华达山脉北部站点的地理位置往往……
AbstractAtmospheric rivers (ARs) are narrow regions of enhanced water vapor transport, usually found on the warm-sector side of the polar cold front in many midlatitude storms formed primarily over the oceans. Nonbrightband (NBB) rain is a shallow orographic rainfall process driven by collision and coalescence that has been observed in some of these storms. NBB rain accounts for about one-third, on average, of the total winter season rainfall occurring at a coastal mountain site in Northern California. During the California Energy Commission’s CalWater project, nearly the same fraction of NBB rain was observed at a northern Sierra Nevada foothills site as compared to the coastal mountains, whereas less than half of the fractional amount of NBB rain was observed at a southern Sierra Nevada foothills site. Both Sierra Nevada sites often experience terrain-induced blocked flow, that is, Sierra barrier jet (SBJ) during landfalling winter storms. However, the northern Sierra Nevada site often is oriented geogr...