Groisman P Y, Karl T R, Knight R W
Science. 1994 Jan 14;263(5144):198-200. doi: 10.1126/science.263.5144.198.
Analysis of satellite-derived snow cover, radiative balance, and surface air temperature over Northern Hemisphere extratropical land shows that the retreat of the Northern Hemisphere's extent of spring snow cover over the past 20 years parallels a change in the influence of snow cover on the radiative balance and an observed increase of spring temperatures over the same area. These results help explain why the long-term (20th century) increase in surface air temperature over Northern Hemisphere land has been greater in spring than in any other season relative to the interannual variability.
对北半球温带陆地卫星观测的积雪覆盖、辐射平衡和地表气温的分析表明，在过去20年里，北半球春季积雪覆盖范围的退缩与积雪覆盖对辐射平衡影响的变化以及同一地区春季气温的观测升高是平行的。这些结果有助于解释为什么相对于年际变化而言，北半球陆地表面气温在20世纪的长期升高在春季比在其他任何季节都更为显著。
