Imprints of Climate Signals in a 204 Year δ18O Tree-Ring Record of Nothofagus pumilio From Perito Moreno Glacier, Southern Patagonia (50°S)
Imprints of Climate Signals in a 204 Year δ18O Tree-Ring Record of Nothofagus pumilio From Perito Moreno Glacier, Southern Patagonia (50°S)
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巴塔哥尼亚南部佩里托莫雷诺冰川 (南纬 50°) 的南山青冈 204 年 δ18O 树轮记录中的气候信号印记
DOI：
10.3389/feart.2018.00027
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发表时间：
2018
影响因子：
2.9
通讯作者：
P. Hochreuther
中科院分区：
文献类型：
--
作者：
Jussi Grießinger;Lukas Langhamer;C. Schneider;Björn;David N. Steger;P. Skvarca;M. Braun;W. Meier;A. Srur;P. Hochreuther
在巴塔哥尼亚南部的Perito Moreno冰川附近（50°S）建立了一种南方山毛榉（Nothofagus pumilio）树轮纤维素中204年的18O记录，以评估其气候重建的潜力。氧同位素年代学是由7个单独的树木年轮18O序列建立的，具有显著的序列间平均相关性（r = 0.61），是南美洲50°S以南地区的第一个此类年代学。在1960 - 2013年的固定和高分辨率网格化CRU TS v. 4.01数据中，相关分析表明，18O年表对水文气候和温度参数具有很强的敏感性。其中，与夏季前期最高气温正相关（CRU rONDJ = 0.51, p<0.01）和与植被期后半期降水负相关（CRU rONDJ = - 0.54, p<0.01）的敏感性最高。南环状模态（SAM）在植被期具有显著的正相关（rONDJ = 0.62, p<0.01），这一年代学清楚地记录了南环状模态（SAM）的强超区域影响。这表明，所提出的1860年年表很有希望重建南美洲南部近两个世纪内SAM的影响和变化。反演轨迹模拟显示，这一系列正、负异常的调制可以与水汽来源的变化相联系。此外，这些异常与南极涛动指数（AAOI）的正相位或负相位直接相关，因此与西风带的强度有关。通过对不同主要天气类型对1860年年表的影响的分析，可以看出，这些时间序列有可能额外捕捉到它们在过去几个世纪中各自的影响和变化。
A 204 year-long record of 18O in tree-ring cellulose of southern beech (Nothofagus pumilio) from a site near Perito Moreno Glacier (50°S) in southern Patagonia was established to assess its potential for a climate reconstruction. The annually resolved oxygen isotope chronology is built out of seven individual tree-ring 18O series with a significant mean inter-series correlation (r = 0.61) and is the first of its kind located in Southern America south of 50°S. Over a common period from 1960 to 2013 of available stationary and high-resolution gridded CRU TS v. 4.01 data, the 18O chronology exhibits a strong sensitivity towards hydroclimatic as well as temperature parameters as revealed by correlation analyses. Among these, positive correlations with maximum temperature in the first part of the summer season (CRU rONDJ = 0.51, p<0.01) and negative correlations with precipitation in the latter half of the vegetation period (CRU rONDJ = - 0.54, p<0.01) show the highest sensitivities. A strong supra-regional influence of the Southern Annular Mode (SAM) is clearly recorded in this chronology as indicated by significant positive correlations during the vegetation period (rONDJ = 0.62, p<0.01). This indicates that the presented 18O-chronology shows great promise to reconstruct the influence and variability of the SAM within the last two centuries in southern South America. The modulation of positive and negative anomalies within this series can be interlinked to changes in moisture source origin as revealed by backward trajectory modeling. Additionally, these anomalies can be directly associated to positive or negative phases of the Antarctic Oscillation Index (AAOI) and therefore the strength of the Westerlies. Aligned by the analysis on the influence of different main weather types on the 18O chronology it is shown that such time-series hold the potential to additionally capture their respective influence and change during the last centuries.