Technical note: Precipitation-phase partitioning at landscape scales to regional scales
Technical note: Precipitation-phase partitioning at landscape scales to regional scales
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DOI：
10.5194/hess-24-5317-2020
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发表时间：
2020-11-14
影响因子：
6.3
通讯作者：
Hatchett, Benjamin J.
中科院分区：
文献类型：
--
作者：
Lynn, Elissa;Cuthbertson, Aaron;Hatchett, Benjamin J.
整个美国西部的水资源管理主要依赖于将冷季山区降水分为雨和雪，特别是雪，因为它最大限度地增加了暖季使用的可用水。最近的研究表明，降雨量增加的趋势正在转变，这与气候变暖相一致。提出了一种方法来估计降水相分区景观从1948年到现在相结合的细尺度网格降水数据与粗尺度冻结水平和降水数据从大气再分析。这些数据集的婚姻允许一种新的方法来估计降水分区的空间格局和趋势在主要供水流域的海拔和纬度梯度。该产品在加州用作山区流域降水阶段变化的诊断指标。结果表明，在过去的70年里，在春季位于北方加州气候雨雪过渡区的低海拔流域的降水量增加最多。该指标的进一步发展可以为适应气候变化的水管理战略的制定和实施提供信息。
Water management throughout the western United States largely relies on the partitioning of cool season mountain precipitation into rain and snow, particularly snow as it maximizes available water for warm season use. Recent studies indicate a shift toward increased precipitation falling as rain, which is consistent with a warming climate. An approach is presented to estimate precipitation-phase partitioning across landscapes from 1948 to the present by combining fine-scale gridded precipitation data with coarse-scale freezing level and precipitation data from an atmospheric reanalysis. A marriage of these data sets allows for a new approach to estimate spatial patterns and trends in precipitation partitioning over elevational and latitudinal gradients in major water supply basins. This product is used in California as a diagnostic indicator of changing precipitation phase across mountain watersheds. Results show the largest increases in precipitation falling as rain during the past 70 years in lower elevation watersheds located within the climatological rainsnow transition regions of northern California during spring. Further development of the indicator can inform adaptive water management strategy development and implementation in the face of a changing climate.