Elevation‐dependent precipitation response to El Niño‐Southern oscillation revealed in headwater basins of the US central Rocky Mountains,International Journal of Climatology

当前位置： X-MOL 学术 › Int. J. Climatol. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Elevation‐dependent precipitation response to El Niño‐Southern oscillation revealed in headwater basins of the US central Rocky Mountains
International Journal of Climatology ( IF 3.5 ) Pub Date : 2020-08-06 , DOI: 10.1002/joc.6790
Jonathon R. Preece _{1,

2} , Jacqueline J. Shinker ₃ , Clifford S. Riebe ₃ , Thomas A. Minckley ₃

Affiliation

We used nonparametric analyses of gridded precipitation data from the Parameter‐Elevation Relationships on Independent Slopes Model (PRISM) to examine teleconnections between the El Niño‐Southern Oscillation (ENSO) and elevation‐related precipitation variability from 1950 to 2016 over the Snake‐Salt, Wind‐Bighorn, Green, and Platte basins, which span the North American continental divide. Our analyses parse data into three‐month‐long meteorological seasons and use the Japan Meteorological Agency (JMA) index to examine seasonal precipitation during El Niño and La Niña years. The results reveal statistically significant elevation‐related variability in seasonal precipitation response: ENSO‐related differences in precipitation were most widespread during winter, with below‐normal precipitation during El Niño and above‐normal precipitation during La Niña. These connections were particularly clear, with p‐values <.01, in analyses focused on high elevations, where most precipitation falls. Hence, the most apparent ENSO‐related impacts on precipitation were observed during months and at elevations that are crucial to snowpack growth. In addition, our analyses of low elevations of the Platte Basin reveal above‐normal spring and fall precipitation during El Niño and below‐normal fall precipitation during La Niña. Comparison of PRISM and North American Regional Reanalysis (NARR) datasets for the period of overlap (1979–2016) suggest that the elevational response is robust. Together, our findings expand the scope of documented ENSO teleconnections in western North America and underscore the importance of parsing precipitation response over temporal and spatial scales that are relevant to the timing and location of dominant precipitation inputs in the topographically diverse western United States.

中文翻译：

美国落基山脉中部流域揭示了海拔依赖性对厄尔尼诺-南方振荡的降水响应

我们使用来自独立坡度参数-高度关系模型（PRISM）的网格降水数据的非参数分析来检验厄尔尼诺-南方涛动之间的遥相关（ENSO）和1950年至2016年与横跨北美大陆分水岭的Snake-Salt，Wind-Bighorn，Green和Platte盆地的海拔高度相关的降水变化。我们的分析将数据解析为三个月之久的气象季节，并使用日本气象厅（JMA）指数检查厄尔尼诺和拉尼娜年期间的季节性降水。结果表明，与季节变化相关的海拔高度变化具有统计学意义：与ENSO相关的降水差异在冬季最为普遍，厄尔尼诺时期降水低于正常水平，而拉尼娜时期降水高于正常水平。这些联系特别清楚，其中p-值<.01，主要针对高降水量最多的高海拔地区进行的分析。因此，在数月和对积雪增长至关重要的海拔地区，观察到了与ENSO相关的对降水的最明显影响。此外，我们对普拉特盆地低海拔地区的分析显示，厄尔尼诺期间春季和秋季降水高于正常，而拉尼娜期间秋季降水低于正常。比较PRISM和北美地区再分析（NARR）数据集在重叠期间（1979–2016）的结果，表明海拔响应是可靠的。一起，

更新日期：2020-08-06

点击分享查看原文

点击收藏

阅读更多本刊最新论文本刊介绍/投稿指南11