Comparison of surface albedo feedback in climate models and observations
Comparison of surface albedo feedback in climate models and observations
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DOI：
10.1002/2014gl059280
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发表时间：
2014-03
影响因子：
5.2
通讯作者：
J. Crook;P. Forster
中科院分区：
文献类型：
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作者：
J. Crook;P. Forster
与热带地区相比，冰雪反照率反馈在北极变暖程度更大的过程中起着重要作用。以前的工作估计了观测到的北半球冰冻圈反馈，但还没有估计来自全球观测的地表反照率反馈。这里我们比较了卫星资料和11个海-气耦合气候模式对气候变化和季节循环的纬向平均地表反照率反馈。观测数据集之间的差异使得约束模型变得困难。然而，我们发现气候变化的北半球温带反馈对于观测值(潜在的3.1±1.3Wm−2K−1)比模式(0.4Wm−2K−1)高得多，而季节周期反馈在观测值和模式中是相似的，这使得人们对季节周期准确预测气候变化反馈的能力产生怀疑。观测到的南极海冰反馈在季节周期中为强正反馈，与模式相似。
Snow and ice albedo feedback plays an important role in the greater warming of the Arctic compared to the tropics. Previous work has estimated the observed Northern Hemisphere cryosphere feedback, but there have been no estimates of surface albedo feedback from observations globally. Here we compare the zonal mean surface albedo feedback from satellite data sets with that from eleven ocean‐atmosphere coupled climate models for both climate change and the seasonal cycle. Differences between observed data sets make it difficult to constrain models. Nevertheless, we find that climate change Northern Hemisphere extratropical feedback is considerably higher for observations (potentially 3.1 ± 1.3 W m−2 K−1) than models (0.4–1.2 W m−2 K−1), whereas the seasonal cycle feedback is similar in observations and models, casting doubt on the ability of the seasonal cycle to accurately predict the climate change feedback. Observed Antarctic sea ice feedback is strongly positive in the seasonal cycle and similar to models.