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从第三极到北极: 积雪变化研究进展
刘一静1(), 孙燕华1, 钟歆玥2(), 王树发1, 肖雄新3, 马丽娟4, 苏航5, 赵文宇1, 张廷军1,6()
Changes of snow cover in the Third Pole and the Arctic
Yijing LIU1(), Yanhua SUN1, Xinyue ZHONG2(), Shufa WANG1, Xiongxin XIAO3, Lijuan MA4, Hang SU5, Wenyu ZHAO1, Tingjun ZHANG1,6()

图4. 相对于1981—2010年, 北极陆地区域(> 60° N)1967—2016年4月(a), 5月(b)和6月(c)的月积雪范围变化45
黑色和红色实线分别代表北美和欧亚北极地区积雪范围距平的5年滑动平均; 实心圆点仅表示2018年的距平

Fig.4. Monthly snow cover extent for Arctic land areas (> 60° N) for April (a), May (b) and June (c) from 1967 to 2016. Anomalies are relative to the average for 1981—2010 and standardized45
Solid black and red lines depict 5-year running means for North America and Eurasia,respectively. Filled circles are used to highlight 2018 anomalies