Hydrometeorological characteristics of rain-on-snow events associated with atmospheric rivers
Hydrometeorological characteristics of rain-on-snow events associated with atmospheric rivers
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DOI：
10.1002/2016gl067978
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发表时间：
2016-03-28
影响因子：
5.2
通讯作者：
Neiman, Paul J.
中科院分区：
文献类型：
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作者：
Guan, Bin;Waliser, Duane E.;Neiman, Paul J.
大气河流（ARs）是狭窄的，细长的，加强水汽输送的天气走廊，在区域天气/水文中起着重要的作用。由于降雨和融雪的综合影响，AR期间的雨-雪（ROS）事件增加了洪水风险。该研究以加州的Sierra内华达州为重点，确定了1998-2014年冬季ROS的发生及其与AR的联系。在所有降水事件的17%期间发生的AR条件与50%的ROS事件（50个中的25个）相关。复合分析表明，与没有ROS的AR相比，有ROS的AR平均温暖2K，雪水当量损失为0.7cm/d（提供20%的可用于径流的合并水）和50%的径流/降水比。大气红外探测器反演揭示了两种类型的AR的不同的近海特征。结果强调了观察这些事件对于雪、雨和洪水预测的潜在价值。
Atmospheric rivers (ARs) are narrow, elongated, synoptic corridors of enhanced water vapor transport that play an important role in regional weather/hydrology. Rain-on-snow (ROS) events during ARs present enhanced flood risks due to the combined effects of rainfall and snowmelt. Focusing on California's Sierra Nevada, the study identifies ROS occurrences and their connection with ARs during the 1998-2014 winters. AR conditions, which occur during 17% of all precipitation events, are associated with 50% of ROS events (25 of 50). Composite analysis shows that compared to ARs without ROS, ARs with ROS are on average warmer by 2K, with snow water equivalent loss of 0.7cm/d (providing 20% of the combined water available for runoff) and 50% larger streamflow/precipitation ratios. Atmospheric Infrared Sounder retrievals reveal distinct offshore characteristics of the two types of ARs. The results highlight the potential value of observing these events for snow, rain, and flood prediction.