Spatial patterns of climatic changes in the Eurasian north reflected in Siberian larch tree‐ring parameters and stable isotopes
Spatial patterns of climatic changes in the Eurasian north reflected in Siberian larch tree‐ring parameters and stable isotopes
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DOI：
10.1111/j.1365-2486.2009.02008.x
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发表时间：
2010-03
影响因子：
11.6
通讯作者：
O. Sidorova;R. Siegwolf;M. Saurer;M. M. Naurzbaev-M.;A. Shashkin;E. Vaganov
中科院分区：
文献类型：
--
作者：
O. Sidorova;R. Siegwolf;M. Saurer;M. M. Naurzbaev-M.;A. Shashkin;E. Vaganov
基于1900-2006年俄罗斯东部泰梅尔（TAY）和东北雅库特（YAK）的落叶松树轮宽度（TRW）指数、晚材密度（MXD）、全木δ 13 C、δ 18 O和纤维素年表，对沿着极地地区的气候变化进行了空间描述。与芬兰δ ~（13）C纤维素年代学（FIN）和格陵兰岛δ ~（18）O冰芯记录（GISP 2）进行了比较。相关分析表明，TRW，MXD，稳定同位素年代学与TAY和YAK的6月，7月气温之间存在很强的正相关关系，而降水信号在所研究站点的树轮参数和稳定同位素数据中的反映不同。TAY的7、8月降水量与稳定同位素和MXD呈负相关，而YAK的MXD和稳定同位素则反映了5、7月降水量。TAY和YAK的TRW与降水量之间没有显著的相关性。7月网格化温度与TRW、MXD和稳定同位素显著相关的区域，YAK从东到西，TAY从北到南分布广泛。气候信号更强的表达在整个木材比在纤维素西伯利亚地区。FIN和TAY的δ 13 C纤维素年表的对比分析显示，近几十年来，两者的δ 13 C纤维素年表呈现出相似的下降趋势，这可以用大气CO2浓度增加的生理效应来解释。TAY和YAK的TRW、MXD和δ 13 C年代学与北大西洋涛动指数呈负相关，而δ 18 O年代学与北大西洋涛动指数呈正相关，证实了高纬度地区近年来的变暖趋势。牦牛年表中纤维素的GISP 2和δ 18 O之间的强相关性反映了由降水表达的大气环流模式所连接的大尺度气候信号。
A spatial description of climatic changes along circumpolar regions is presented based on larch tree‐ring width (TRW) index, latewood density (MXD), δ13C, δ18O of whole wood and cellulose chronologies from eastern Taimyr (TAY) and north‐eastern Yakutia (YAK), Russia, for the period 1900–2006, in comparison with a δ13C cellulose chronology from Finland (FIN) and a δ18O ice core record from Greenland (GISP2). Correlation analysis showed a strong positive relationships between TRW, MXD, stable isotope chronologies and June, July air temperatures for TAY and YAK, while the precipitation signal was reflected differently in tree‐ring parameters and stable isotope data for the studied sites. Negative correlations were found between July, August precipitation from TAY and stable isotopes and MXD, while May, July precipitations are reflected in MXD and stable isotopes for the YAK. No significant relationships were found between TRW and precipitation for TAY and YAK. The areas of significant correlations between July gridded temperatures and TRW, MXD and stable isotopes show widespread dimension from east to west for YAK and from north to south for TAY. The climate signal is stronger expressed in whole wood than in cellulose for both Siberian regions. The comparison analysis between δ13C cellulose chronologies from FIN and TAY revealed a similar declining trend over recent decades, which could be explained by the physiological effect of the increasing atmospheric CO2. TRW, MXD and δ13C chronologies from TAY and YAK show a negative correlation with North Atlantic Oscillation index, while the δ18O chronologies show positive correlations, confirming recent warming trend at high latitudes. The strong correlation between GISP2 and δ18O of cellulose from YAK chronologies reflects the large‐scale climatic signal connected by atmospheric circulation patterns expressed by precipitation.