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Climate and the solar cycle 气候和太阳圈 Chilling out in the winter sun 在冬日的阳光中发冷 Stratospheric changes can lead to nasty cold snaps 平流层的变化能引发讨人厌的寒流 THOSE unconvinced-and those seeking to unconvince others-of the reality of man-madeglobal warming often point to the changeable behaviour of the sun as an alternativehypothesis. 不相信全球变暖是人为因素造成的和那些企图让别人不相信的人常常会将太阳的易变表现作为假设进行选择。 A new study showing how the severity of winters in Europe, and warming in the Arctic, mightbe linked to changes in solar activity might seem to add to this case. 一项新的研究正在致力于研究欧洲的严冬和日渐变暖的北极圈与太阳的变化活动可能的关联，似乎是为了证明此观点。 In itself, it does not, for the heat in question is being redistributed, notretained. 实则不然，因为受人质疑的太阳热能一直在重新分布，而不是保持不变的。 But it does point to two other lessons about climate change: that hard data on the factorswhich affect it are sometimes difficult to come by; and that computer models of the climatecan be quite impressive tools for working out what is going on. | 
