A drop in mid‐summer shortwave radiation induced by changes in the ice‐surface condition in the central Arctic
A drop in mid‐summer shortwave radiation induced by changes in the ice‐surface condition in the central Arctic
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北极中部冰面状况变化导致仲夏短波辐射下降
DOI：
10.1029/2005gl023170
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发表时间：
2005
影响因子：
5.2
通讯作者：
J. Morison
中科院分区：
文献类型：
--
作者：
J. Inoue;T. Kikuchi;D. Perovich;J. Morison
利用2002年、2003年和2004年作为北极环境观测项目一部分部署的漂流浮标的短波辐射数据，分析了夏季冰面变化和对北极太阳热输入的影响。观测到的短波辐射大约是初夏大气层顶部短波辐射的一半，这表明天空多云。在每年的仲夏之后都会发生一些事件，在此期间，大气层顶部的短波辐射减少了33%至三分之一。雪深数据、航空照片和浮标位置的融化开始日期表明，由雪融化和融化池形成引起的雪/冰覆盖度的减少通过多次反射改变了短波辐射量。冰-冰反馈的简化计算显示，仲夏后短波辐射的下降是自阻尼的。
Ice‐surface changes during summer and effects on solar heat input in the Arctic were analyzed using incoming shortwave radiation data from drifting buoys deployed in 2002, 2003, and 2004 as part of the North Pole Environmental Observatory project. Observed shortwave radiation was about half of the incoming shortwave radiation at the top of the atmosphere during early summer, suggesting cloudy skies. In each year, events occurred after mid‐summer during which time the shortwave radiation decreased 33% to one third of shortwave radiation at the top of the atmosphere. Snow‐depth data, aerial photos, and date of melt onset at the buoy site suggest that a decrease in snow/ice albedo induced by snow melting and melt‐pond formation modified the amount of shortwave radiation through multiple reflections. A simplified calculation of the ice‐albedo feedback revealed that the drop in shortwave radiation after mid‐summer was self damping.