主题：【已应助】求助文献三篇，万分感谢！！！

【序号】：1
【作者】：Gennaretti, et al
【题名】：Volcano-induced regime shifts in millennial tree-ring chronologies from northeastern North America
【期刊】：Proceedings of the National Academy of Sciences
【年、卷、期、起止页码】：Edited by Ellen S. Mosley-Thompson, The Ohio State University, Columbus, OH, and approved May 29, 2014 (received for review January 21, 2014)

【全文链接】：http://www.pnas.org/content/early/2014/06/25/1324220111.abstract?sid=be380dac-ea63-43dd-ac67-a60a65c7f931

【序号】：2
【作者】：Thomas L. Delworth
【题名】：Regional rainfall decline in Australia attributed to anthropogenic greenhouse gases and ozone levels
【期刊】：NATURE GEOSCIENCE |
【年、卷、期、起止页码】：Nature Geoscience (2014) doi:10.1038/ngeo2201
【全文链接】：http://www.nature.com/ngeo/journal/vaop/ncurrent/full/ngeo2201.html

【序号】：3
【作者】：Michael et al
【题名】：Insights from Antarctica on volcanic forcing during the Common Era
【期刊】：Nature Clim. Change
【年、卷、期、起止页码】：NATURE CLIMATE CHANGE | LETTER
【全文链接】：http://www.nature.com/nclimate/journal/vaop/ncurrent/full/nclimate2293.html