Select Tree-Ring Chronologies for Large-Scale Paleoclimate Reconstruction

Stahle, David W.，阿色大学（University of Arkansas）论文名称：选择年轮年表用于大规模古气候重建年轮年表来源于古树的年轮年表提供了精确的年代，强复制的环境历史档案，并提供了全新世期间年际至年代际气候变化的主要定量记录之一。墨西哥北部和美国南部的树木年轮年表反映了区域气候变化和大尺度大气环流的变化。该奖项支持旨在开发对厄尔尼诺/南方涛动（ENSO）和太平洋/北美（PNA）环流模式敏感的北美亚热带地区广泛分布的长树轮年表的研究。对ENSO或pna最敏感的年表发生的选定地点将被重新访问，以取样更多的古树、附近建筑物中的历史木材或保存完好的亚化石木材，以便编制过去环流的最长可能代用物。该项目还将加强努力，在热带东非开发第一个气候和ENSO敏感的树木年轮年表。拟议的ENSO和PNA重建应该为ENSO和/或其遥相关的长期变异性提供独特的见解；ENSO与中世纪暖期、小冰期和20世纪变暖期间全球平均温度之间的可能联系；以及ENSO和PNA在强迫北美气候异常中可能存在的耦合/解耦。

Abstract ATM-9528148 Stahle, David W. University of Arkansas Title: Select Tree-ring Chronologies for Large-scale Paleoclimate Reconstruction Annual ring-width chronologies derived from ancient trees present exactly-dated, strongly-replicated archives of environmental history, and provide one of the premier quantitative records of interannual to decadal climate variability during the Holocene. Select tree-ring chronologies from northern Mexico and the southern USA reflect both regional climate variations and changes in large- scale atmospheric circulation. This award supports research designed to develop a widely distributed array of long tree-ring chronologies in subtropical North America that are sensitive to the El Nino/Southern Oscillation (ENSO) and the Pacific/North America (PNA) circulation pattern. Selected locations where the most ENSO or PNA-sensitive chronologies occur will be revisited to sample additional ancient trees, historic timbers in nearby buildings, or well-preserved subfossil wood in order to compile the longest possible proxies of past circulation. This project will also intensify the effort to develop the first climate and ENSO- sensitive tree-ring chronologies in tropical East Africa. The proposed ENSO and PNA reconstruction should provide unique insight into the long-term variability of ENSO and/or its teleconnections; the possible link between ENSO and global average temperature during the Medieval Warm Period, Little Ice Age, and 20th century warming; and the possible coupling/decoupling between ENSO and PNA in forcing climate anomalies over North America.