Cloud response to summer temperatures in Fennoscandia over the last thousand years
Cloud response to summer temperatures in Fennoscandia over the last thousand years
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DOI：
10.1029/2010gl046216
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发表时间：
2011-03-01
影响因子：
5.2
通讯作者：
Kirchhefer, Andreas
中科院分区：
文献类型：
--
作者：
Gagen, Mary;Zorita, Eduardo;Kirchhefer, Andreas
云量是控制地球辐射平衡的重要因素之一。云量对全球气温升高的响应是未来气候模型估计中最大的不确定性，因为云对温度的响应没有受到很好的约束。在这里，我们提出了第一个区域重建的夏季阳光在过去的一千年中，根据稳定的碳同位素比值的松树从芬诺斯堪的纳维亚。与区域温度演变的比较表明，小冰期（LIA）一直是阳光明媚的，在中世纪最温暖的时期，在这个网站多云的条件。在高纬度地区，短波云反馈为负。千年气候模拟表明，在LIA期间，区域低温主要是由较弱的温室效应维持的，因为湿度较低。未来气候的模拟显示了高纬度地区的负短波云反馈与我们的代理解释是一致的。引文：Gagen，M.，E. Zorita，D. McCarroll，G. H. F.杨，H。格鲁德河Jalkanen，N. J. Loader岛Robertson和A. Kirchhefer（2011），云对芬诺斯坎迪亚过去一千年夏季温度的反应，Geophys。保留信函：38，L05701，doi：10.1029/2010GL046216。
Cloud cover is one of the most important factors controlling the radiation balance of the Earth. The response of cloud cover to increasing global temperatures represents the largest uncertainty in model estimates of future climate because the cloud response to temperature is not well-constrained. Here we present the first regional reconstruction of summer sunshine over the past millennium, based on the stable carbon isotope ratios of pine treerings from Fennoscandia. Comparison with the regional temperature evolution reveals the Little Ice Age (LIA) to have been sunny, with cloudy conditions in the warmest periods of the Medieval at this site. A negative shortwave cloud feedback is indicated at high latitude. A millennial climate simulation suggests that regionally low temperatures during the LIA were mostly maintained by a weaker greenhouse effect due to lower humidity. Simulations of future climate that display a negative shortwave cloud feedback for high-latitudes are consistent with our proxy interpretation. Citation: Gagen, M., E. Zorita, D. McCarroll, G. H. F. Young, H. Grudd, R. Jalkanen, N. J. Loader, I. Robertson, and A. Kirchhefer (2011), Cloud response to summer temperatures in Fennoscandia over the last thousand years, Geophys. Res. Lett., 38, L05701, doi:10.1029/2010GL046216.