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首页> 外文期刊>Journal of geophysical research. Earth Surface: JGR >Timing of retrogressive thaw slump initiation in the Noatak Basin, northwest Alaska, USA
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Timing of retrogressive thaw slump initiation in the Noatak Basin, northwest Alaska, USA

机译：美国阿拉斯加西北部Noatak盆地倒退性融化坍落开始的时间

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摘要

In the North American low arctic, increased retrogressive thaw slump frequency and headwall retreat rates have been linked with climate warming trends since the midtwentieth century, but specific weather drivers of slump initiation timing are less clear. We examined relationships among retrogressive thaw slump initiation and annual air temperature, precipitation, and snow cover using time series of satellite imagery and weather station data in northwest Alaska. Synthetic aperture RADAR and optical imagery were used to examine retrogressive thaw slump initiation between 1997 and 2010. Over 80% of the slump features examined in this study first appear within a 13month span from late June 2004 to July 2005. Remote weather station data show that 2004 and 2005 are among several years exhibiting above average thawing indices and average summer temperatures between 1992 and 2011. However, 2004 is distinct from the rest of the record, with unusually warm temperatures primarily occurring early in the thaw season between April and early June, and including two intense precipitation events in May. Regional weather reported by the NOAA National Weather Service also reflects these local findings. Snowmelt timing in 2004 corresponded with warmer air temperatures and precipitation between April and May, exposing the ground surface more than 2 weeks earlier than average for 2001–2012 within the Noatak Basin. Future rates of thaw slump initiation may be linked with changing trends in the timing of weather, in addition to general climate warming.
机译：自20世纪中叶以来，在北美低北极地区，逆向解冻坍塌频率增加和顶壁退缩率增加与气候变暖趋势有关，但对坍落开始时间的具体天气驱动因素尚不清楚。我们使用阿拉斯加西北部的卫星图像和气象站数据的时间序列，检验了退行性融化坍落度开始与年度气温，降水和积雪之间的关系。合成孔径雷达和光学图像用于检查1997年至2010年之间的退行性融化坍落度始发。这项研究中检查的坍落度特征中，有超过80％的首次出现是在2004年6月下旬至2005年7月的13个月内。 2004年和2005年是1992年至2011年之间表现出高于平均解冻指数和夏季平均温度的年份。然而，2004年与记录的其余部分截然不同，异常温暖的温度主要发生在4月至6月初的解冻季节初期，包括五月的两次强降水事件。 NOAA国家气象局报告的区域天气也反映了这些当地的发现。 2004年的融雪时间与4月和5月之间的气温升高和降水相对应，从而使Noatak盆地的地面暴露时间比2001-2012年的平均值提前了2周以上。除了普遍的气候变暖以外，未来解冻坍塌的发生率还可能与天气变化的趋势有关。

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