Quantifying the role of atmospheric rivers in the interior western United States
Quantifying the role of atmospheric rivers in the interior western United States
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DOI：
10.1002/asl.392
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发表时间：
2012-10
影响因子：
3
通讯作者：
J. Rutz;W. J. Steenburgh
中科院分区：
文献类型：
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作者：
J. Rutz;W. J. Steenburgh
大气河流(AR)因其对高影响天气和气候变异性的贡献而日益被认识到。最近的一项基于主要位于美国西部低地山谷和盆地的观测的调查表明，1998年至2008年之间的冷季(11月至4月)总降雨量的10%-50%发生在AR登陆的当天和次日(下称AR分数)，这是通过特殊传感器微波成像仪数据确定的。然而，这些结果仅基于横跨北美西海岸32.5°N到52.5°N之间的ARS，这不包括横跨巴哈半岛西海岸的ARS。在这里，我们在ERA中期再分析中确定AR，并在高海拔观测站和NOAA/CPC联合日降水分析中检查AR部分。在高海拔积雪遥测站点，我们发现与先前获得的山谷和盆地位置的AR分数很好地吻合。我们还表明，包括横跨巴哈半岛西海岸(最南达24°N)的AR显著增加了美国西南部的AR分量。版权所有©2012皇家气象学会
Atmospheric rivers (ARs) have increasingly been recognized for their contribution to high‐impact weather and climate variability. A recent investigation based on observations located primarily in lowland valleys and basins of the western United States suggests that 10–50% of the total cool season (November to April) precipitation between water years 1998 and 2008 occurred on the day of and day following AR landfall (hereafter the AR fraction), as identified using Special Sensor Microwave Imager data. However, these results are based only on ARs crossing the North American west coast between 32.5°N and 52.5°N, which excludes those crossing the west coast of the Baja Peninsula. Here, we identify ARs in the ERA‐Interim reanalysis and examine the AR fraction at high‐elevation observational sites and in the NOAA/CPC Unified Daily Precipitation Analysis. At high‐elevation snowpack telemetry sites, we find good agreement with the AR fraction obtained previously for valley and basin locations. We also show that including ARs crossing the west coast of the Baja Peninsula (as far south as 24°N) substantially increases the AR fraction over the southwestern United States. Copyright © 2012 Royal Meteorological Society