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Reconstructing snowmelt in Idaho’s watershed using historic streamflow records

机译:利用历史流量记录重建爱达荷州流域的融雪

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摘要

In recent decades, a warming climate likely has accelerated the timing of spring snowmelt in the western United States; however, records of the timing of snowmelt typically only extend to the 1980s. Stream gage data can lengthen records of the timing of snowmelt back to the early 1900s, enhancing understanding of past, current, and future climate change on snowmelt-dominated watersheds and associated ecosystems. We used snowpack telemetry data and historic streamflow records to test reconstructions of final snowmelt dates using Short Time Fourier Transform (STFT) wavelet analysis of hydrographs. STFT reconstructions tested against known final snowmelt dates over the last ~25 years indicate final snowmelt can be determined within ±4 days ~95% of the time and within ±7 days 100% of the time. Comparison of the STFT method with the center of timing method indicates that in addition to reconstructing actual snowmelt dates (as opposed to dates associated with the center of timing of streamflow), the STFT method may limit interpretation errors associated with changes in discharge not related to snowmelt. Reconstructions of final snowmelt dates in the Idaho, U.S. study area show intervals of early snowmelt (1920s–1930s), later and less variable snowmelt (1940s–1970s), and both variable and early snowmelt (~1985–2007). Early and variable snowmelt during the last ~20 years is associated with large wildfires.
机译:近几十年来,气候变暖可能加快了美国西部春季融雪的时间。但是,关于融雪时间的记录通常仅延续到1980年代。流量表数据可以将融雪时间的记录延长到1900年代初,从而增强对融雪为主的流域和相关生态系统过去,当前和未来气候变化的了解。我们使用积雪遥测数据和历史流量记录,通过水文图的短时傅立叶变换(STFT)小波分析来测试最终融雪日期的重建。根据过去约25年内已知的最终融雪日期进行的STFT重建测试表明,最终融雪可以在±4天〜95%的时间内确定,而在±7天之内可以100%的时间内确定。 STFT方法与计时中心方法的比较表明,除了重建实际融雪日期(与与流动时间计时中心相关的日期相反)之外,STFT方法还可以限制与与排放无关的排放变化相关的解释错误。雪融化。美国爱达荷州研究区最终融雪日期的重建显示了早期融雪的时间间隔(1920年代至1930年代),后期融雪的时间和变化较小的时期(1940年代至1970年代),以及可变融雪期和早期融雪期(〜1985-2007年)。过去约20年的早期融雪与大火有关。

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