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首页> 外文期刊>Geophysical Research Letters >Northern Rocky Mountain streamflow records: Global warming trends, human impacts or natural variability?
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Northern Rocky Mountain streamflow records: Global warming trends, human impacts or natural variability?

机译:北部洛矶山脉河流流量记录:全球变暖趋势,人类影响或自然变异?

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The~60 year Pacific Decadal Oscillation (PDO) is a major factor controlling streamflow in the northern Rocky Mountains, causing dryness during its positive phase, and wetness during its negative phase. If the PDO's influence is not incorporated into a trend analysis of streamflows, it can produce detected declines that are actually artifacts of this low-frequency variability. Further difficulties arise from the short length and discontinuity of most gauge records, human impacts, and residual autocorrelation. We analyze southern Alberta and environs instrumental streamflow data, using void-filled datasets from unregulated and regulated gauges and naturalized records, and Generalized Least Squares regression to explicitly model the impacts of the PDO and other climate oscillations. We conclude that streamflows are declining at most gauges due to hydroclimatic changes (probably from global warming) and severe human impacts, which are of the same order of magnitude as the hydroclimate changes, if not greater.
机译:〜60年的太平洋年代际振荡(PDO)是控制落基山脉北部河流水流的主要因素,在其正相期间引起干燥,在负相期间引起湿度。如果PDO的影响未纳入流量趋势分析中,它可能会产生检测到的下降,而这些下降实际上是这种低频变化的产物。大多数规范记录的长度短且不连续,人为影响以及残留的自相关性会带来进一步的困难。我们使用来自不受管制和受管制的仪表以及归化记录的空白数据集,分析了艾伯塔省南部和周围的仪器流量数据,并通过广义最小二乘回归显式地模拟了PDO和其他气候波动的影响。我们得出的结论是,由于水文气候变化(可能是全球变暖)和严重的人类影响(在更大程度上与水文气候变化相同,如果不是更大的话),在大多数尺度上流量正在减少。

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