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Satellite Observations of the Date of Snowmelt at 60° and 70° North Latitude

机译:北纬60°和70°的融雪日期的卫星观测

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In this paper we show changes in the dates of snow disappearance in the Arctic between the late 1960s and the early 2000s, from arbitrary but consistent boundaries, using National Oceanic Atmospheric and Administration (NOAA) satellite observations. The date the snowline retreats during the spring (when it first moves north of the 60° and 70° parallels) has occurred approximately a week earlier in recent decades compared to the late 1960s, for many Arctic locations. During this same period, substantial portions of the Arctic have been experiencing higher temperatures and a conspicuous diminution of sea ice, especially in the past 10 years. Our results generally agree with these observations -- tendency toward earlier snowmelt was sustained until about 1990. Since that time, however, the date of snow disappearance has not been occurring noticeably earlier, and snow cover has actually been forming earlier in the autumn.
机译:在本文中,我们使用国家海洋大气与管理局(NOAA)卫星观测资料,从任意但一致的边界中,显示了1960年代末至2000年代初北极地区积雪消失日期的变化。在许多北极地区,与1960年代后期相比,近几十年来,春季的雪线撤退的日期(当它首次向平行线60°和70°向北移动时)发生在大约几十年前。在同一时期,特别是在过去的10年中,北极的大部分地区都经历了更高的温度,海冰明显减少。我们的结果大体上与这些观察结果一致-早期融雪的趋势一直持续到1990年左右。但是,自那时以来,降雪的日期并没有明显地早些发生,而积雪实际上是在秋天早些时候形成的。

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