2000—2015年北极夏季反照率变化及其与海冰密集度的关系

Arctic Albedo Variations and Its Relationship with Sea Ice Concentration in Summer during 2000—2015

作为影响极区热平衡的关键因素,北极反照率会对北极气候与环境变化产生重要影响。采用CLARA-A2-SAL(The CM SAF Cloud,Albedo and Radiation)反照率产品分析2000—2015年北极夏季反照率月尺度和年尺度的时空变化,并探索北极反照率与海冰密集度的关系。结果表明,近15年间北极夏季反照率降幅达到12.20%,8月反照率下降趋势最显著,每10年减少0.040;随着海冰的融化,北极夏季反照率发生由高到低的变化;北极中央密集冰区与周边海域的反照率变化呈现出显著的空间差异性;北极反照率与海冰密集度呈稳定的正相关。研究北极反照率的时空变化及其影响因素可为解释海冰变化成因、预测北极海冰变化趋势提供参考。

As a key factor affecting the polar heat balance,Arctic albedo has an important influence on climate and environmental changes in the Arctic.In this study,we analyzed spatio-temporal variations of Arctic albedo in summer during 2000—2015 based on CLARA-A2-SAL(The CM SAF Cloud,Albedo and Radiation)albedo products,and the relationship between albedo and sea ice concentration were also explored.The results show that albedo increased by 12.20%during nearly 15 years,the most significant trend of albedo is-0.040 per decade in August;while the inter-annual variation of Arctic albedo follows the melting process of sea ice;as the sea ice melts,the Arctic summer albedo changes from high to low;Arctic albedo is positively correlated with sea ice concentration.This study can provide a reference for explaining the causes of sea ice changes,and for predicting the trend of Arctic sea ice.