Research press release





今回、Luke Truselたちの研究グループは、グリーンランド西部の氷床コアの融解層を分析し、約350年にわたる記録を作成した。Truselたちは、この融解層の記録を現代のグリーンランド全体における広範な融解過程と結び付け、両者の関係を用いてグリーンランド全体の記録を1650年までさかのぼって、近年のグリーンランド氷床の融解と融解水の流出が過去の変動幅を超えて加速していると報告している。


A continuous, multi-century analysis of the melt intensity and runoff of the Greenland Ice Sheet is reported in a paper published this week in Nature. The findings reveal that the Greenland Ice Sheet has melted at a faster rate recently than in the past.

The Greenland Ice Sheet is a major contributor to modern sea-level rise. However, it is unknown whether the current melting rates are unusual, as observational records do not date far back enough, and previous research did not analyse the entire ice sheet.

Luke Trusel and colleagues developed a record that spans over 350 years by analysing melt layers in ice cores from western Greenland. The authors linked these layers to broader melt processes across Greenland in the modern era. Using this relationship, they extend the Greenland-wide record back to 1650, and report that melt and runoff from the Greenland Ice Sheet have recently accelerated outside the range of past variability.

The authors find that Greenland Ice Sheet melting began to increase soon after the onset of industrial-era Arctic warming in the mid-1800s. Additionally, surface melting in 2012 was more extensive than in any time over the past 350 years, and the most recent decade contained in the ice cores (2004-2013) experienced more sustained and intense melting than any other 10-year period recorded. The analysis shows that melt increases nonlinearly with rising temperatures. Consequently, although a past minor warming event might have had little or no impact on melt, the same event in a future, warmer climate could produce a substantially larger melt event.

doi: 10.1038/s41586-018-0752-4

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