Tree-ring reconstructed rainfall over the southeastern U.S.A. during the medieval warm period and little ice age
Tree-ring reconstructed rainfall over the southeastern U.S.A. during the medieval warm period and little ice age
复制标题
树木年轮重建了中世纪温暖期和小冰河期美国东南部的降雨量
DOI：
--
复制
发表时间：
1994
期刊：
影响因子：
--
通讯作者：
M. K. Cleaveland
中科院分区：
文献类型：
--
作者：
D. Stahle;M. K. Cleaveland
基于北卡罗来纳、南卡罗来纳和乔治亚州三次树木年轮对全州降雨的重建，对美国东南部1053年的春季降雨（3- 6月）进行了重建。该区域重建与春季降水的仪器记录高度相关（r = +0.80; 1887-1982），准确再现了近百年来东南地区春季降水的10年尺度变化。在过去的1053年里，没有重建春季降雨量的大幅度百年趋势，但在中世纪暖期（MWP）、小冰期（LIA）和20世纪的部分时期重建了春季降雨量的年际变率的大变化。12世纪末，干旱状况一直持续，但18世纪中期，一场重建的干旱似乎已经超过了干旱。在16世纪末和17世纪初的20年期间，重建了高年际变率，包括5个极端潮湿年，这可能反映了在小冰期最广泛的寒冷时期之一，北美东部的大气环流扩大。
A 1053-year reconstruction of spring rainfall (March-June) was developed for the southeastern United States, based on three tree-ring reconstructions of statewide rainfall from North Carolina, South Carolina, and Georgia. This regional reconstruction is highly correlated with the instrumental record of spring rainfall (r = +0.80; 1887–1982), and accurately reproduces the decade-scale departures in spring rainfall amount and variance witnessed over the Southeast during the past century. No large-magnitude centuries-long trends in spring rainfall amounts were reconstructed over the past 1053 years, but large changes in the interannual variability of spring rainfall were reconstructed during portions of the Medieval Warm Period (MWP), Little Ice Age (LIA), and the 20th century. Dry conditions persisted at the end of the 12th century, but appear to have been exceeded by a reconstructed drought in the mid-18th century. High interannual variability, including five extremely wet years were reconstructed for a 20-yr period during the late 16th and early 17th centuries, and may reflect amplified atmospheric circulation over eastern North America during what appears to have been one of the most widespread cold episodes of the Little Ice Age.