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Changing patterns of daily precipitation totals at the Coweeta Hydrologic Laboratory, North Carolina, USA.

机译：美国北卡罗莱纳州库韦塔水文实验室的日降水总量变化模式。

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摘要

A pattern of increasing frequency and intensity of heavy rainfall over land has been documented for several temperate regions and is associated with climate change. This study examines the changing patterns of daily precipitation at the Coweeta Hydrologic Laboratory, North Carolina, USA, since 1937 for four rain gauges across a range of elevations. We analyse seasonal total rainfall, number of rain days and the frequency of heavy rainfall. We compare these with several teleconnections, including the Bermuda High Index (BHI), the West BHI, the North Atlantic Oscillation (NAO) and the El Niño-Southern Oscillation. Our data show a tendency for increased variability, including major periods of drought, with fewer rain days recently, especially in summer. Only autumn tended to have increases in rainfall frequency and magnitude; this is the season when orographic enhancement is at its strongest. The major driver of precipitation at Coweeta is the strength of the Bermuda High. The strength of the NAO is important in summer. The results are relevant to the southeast United States in general, given that the region comes under the influence of similar air masses during the year. The findings are applicable to the wider Appalachian Mountains and to other mountainous regions where there is significant orographic enhancement
机译：在几个温带地区，已经证明了陆地上暴雨的频率和强度增加的模式，并且与气候变化有关。这项研究研究了自1937年以来美国北卡罗来纳州Coweeta水文实验室的日降水量的变化模式，该降水量涉及四个海拔高度范围的雨量计。我们分析了季节性总降雨，降雨天数和强降雨的频率。我们将它们与几种远程连接进行比较，包括百慕大高指数（BHI），西BHI，北大西洋涛动（NAO）和厄尔尼诺-南方涛动。我们的数据表明，包括主要干旱时期在内，变异性有增加的趋势，最近的雨天减少了，特别是在夏季。只有秋天倾向于增加降雨频率和幅度。这是地形增强最强的季节。 Coweeta降水的主要驱动因素是百慕大高地的强度。在夏季，NAO的力量很重要。鉴于该地区在一年中受到类似空气质量的影响，因此该结果总体上与美国东南部有关。研究结果适用于更广泛的阿巴拉契亚山脉以及地形显着增强的其他山区

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