A spokesperson for HarperCollins said its new map was based on information provided by the US National Snow and Ice Data Center (NSIDC).

哈珀·柯林斯的一位发言人说，新的地图是以美国国家冰雪数据中心(NSIDC)提供的信息为基础。

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The new study focused on surface melt, runoff and the number of days when bare ice, free of snow, is exposed to the Sun's radiative force.

这项新研究的重点是表面融化，径流以及暴露于太阳辐射下的裸冰和无雪天数。

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The report also highlights new evidence that changes in Arctic snow and ice conditions may actually be accelerating the warming process.

这项报告同样也强调了新的证据表明在北极冰雪情况的变化可能会加速全球变暖的进程。

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Unfortunately for snow enthusiasts, the model found that the fragile needle-like ice crystals connecting the two layers can be broken easily and separated by the weight of new snow or a skier.

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