Stalagmite δ18O Record from Yuhua Cave over the Past 500 Years and Its Regional Climate Significance
Received date: 2010-03-09
Request revised date: 2011-04-20
Online published: 2012-02-20
Copyright
Based on 4 230Th dates and 370 stable oxygen isotope ratios (δ18O) obtained from a stalagmite collected from Yuhua Cave, Jiangle, Fujian, and combined with the age calibration of the top 100 years using the annually band counting stalagmite from Heshang Cave, an high-resolution oxygen isotope profile of the past 500 years was established. Comparison of the stalagmite δ18O record with instrumental precipitation data at Yong’an in the past 60 years indicates a high parallelism between the δ18O record and the total summer months (April to September) precipitation, suggesting that the stalagmite δ18O is a good proxy for the local summer monsoon precipitation. A comparison with other high-resolution stalagmites records shows that the trend of increase value of the δ18O during the past 100 years was similar in the East Asian Monsoon area. This supports the idea that the δ18O of the stalagmite from monsoon area indicates characteristics of the East Asian monsoon circulation. Comparison between the δ18O of stalagmite with Asian-Pacific Oscillation index shows a big similarity. On centennial to dacadal time scales, when IAPO is of the high value, the δ18O values will get much lower, and vice versa. Our result demonstrates a strong linkage between Asian monsoon precipitation and the Pacific Ocean via ocean/atmosphere interaction.
Key words: Yuhua Cave; stalagmite; oxygen isotope; IAPO; monsoon circulation
JIANG Xiu-yang , LI Zhi-zhong , LI Jin-quan , KONG Xing-gong , GUO Yun . Stalagmite δ18O Record from Yuhua Cave over the Past 500 Years and Its Regional Climate Significance[J]. SCIENTIA GEOGRAPHICA SINICA, 2012 , 32(2) : 207 -212 . DOI: 10.13249/j.cnki.sgs.2012.02.207
Fig. 1 Locations of the Yuhua Cave, Wanxiang Cave, Heshang Cave and Dongge Cave.图1 本文涉及的溶洞地理位置示意图 |
Table 1 230Th dating results for stalagmite YH1表1 YH1石笋230Th测年结果 |
样品号 (深度) | 238U | 232Th | 230Th / 232Th | δ234U | δ234UInitial | 230Th / 238U | 230Th年龄/yr B.P. | 230Th年龄/yr B.P. |
---|---|---|---|---|---|---|---|---|
( ×10-9 g/g) | ( ×10-12 g/g) | (原子数×10-6) | (测量值) | (校正值) | (活度比) | (未校正值) | (校正值) | |
YH1-70 | 401.4±0.5 | 1242.7±7.5 | 13.0±0.7 | 172.9±1.8 | 173.0±1.8 | 0.0024±0.0001 | 226±12 | 156±37 |
YH1-225 | 437.2±0.5 | 854±11 | 36.3±1.6 | 169.9±2.0 | 170.1±2.0 | 0.0043±0.0002 | 401±17 | 357±28 |
YH1-320 | 480.1±0.6 | 268.0±7.8 | 126.8±5.2 | 167.7±1.9 | 167.9±1.9 | 0.0043±0.0001 | 402±12 | 389±13 |
YH1-370 | 532.1±0.6 | 386.4±8.8 | 119.6±4.1 | 166.7±1.7 | 167.0±1.7 | 0.0053±0.0001 | 493±13 | 477±15 |
注: λ230=9.1577×10-6y-1; λ234=2.8263×10-6y-1; λ238=1.55125×10-10y-1; δ234U= ([234U/238U] 活度比-1) ×1000; δ234U初始值 是根据 230Th 年龄获得, 即δ234U初始值=δ234U测量值×eλ234×T; 校正230Th 年龄假设初始的230Th/232Th 原子比为(4±2)×10-6. yr B.P.中P代表2010年。 |
Fig.2 Comparison between δ18O series of the stalagmite YH1 from Yuhua Cave and the stalagmite HS4 from Heshang Cave图2 玉华洞石笋记录与和尚洞石笋记录对比 |
Fig. 3 The age model for the YH1图3 石笋YH1 的年代模式 |
Fig.4 δ18O record of YH1 stalagmite(a), the annual rainfall amount(b), Summer rainfall amount(c) and annual average temperature(d) in Yong'an. The grey lines are 3 year moving averages图4 玉华洞石笋δ18O记录与永安降水量和温度的对比 |
Fig.5 Comparison of the speleothem δ18O record from Yuhua Cave with monsoon index and Asian Pacific Oscillation index The grey lines are 11 year moving averages图5 福建玉华洞石笋δ18O记录与季风指数及亚洲—太平洋涛动指数对比 |
The authors have declared that no competing interests exist.
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