Coevolutions of terrestrial temperature and monsoonal precipitation amounts from the latest Pleistocene to the mid-Holocene in Japan: Carbonate clumped isotope record of a stalagmite
Coevolutions of terrestrial temperature and monsoonal precipitation amounts from the latest Pleistocene to the mid-Holocene in Japan: Carbonate clumped isotope record of a stalagmite
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DOI：
10.1016/j.chemgeo.2023.121390
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发表时间：
2023-02
期刊：
影响因子：
3.9
通讯作者：
H. Kato;Taiki Mori;Shota Amekawa;Chung‐Che Wu;Chuan‐Chou Shen;A. Kano
中科院分区：
文献类型：
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作者：
H. Kato;Taiki Mori;Shota Amekawa;Chung‐Che Wu;Chuan‐Chou Shen;A. Kano
定量古温度重建是古环境研究中一个具有挑战性和重要性的问题，碳酸盐凝聚同位素（Δ47）测温是一种很有前途的方法。本文分析了日本中部大泷洞66层OT 02石笋2.6- 8.8ka和34.8- 63.5ka的Δ 47值，重建了地温和大气δ 18 O记录。全新世和更新世晚期的平均Δ 47温度分别为16.3 °C ± 5.6 °C和9.7 °C ± 4.6 °C。Δ 47测温结果还表明，寒温区间（5 °C ~ 10 °C）对应于Heinrich海象标HS s 4 -6，暖温区间（19.9 °C ± 6.0 °C）对应于全新世中期（约6-5 ka）的高温气候适宜期。通过扣除石笋δ ~（18）O的温度效应，重建了过去的大气δ ~（18）O。全新世时期大气δ 18 O平均值为−8.2‰ ± 1.0‰（相对于VSMOW），最晚更新世时期为− 8.8‰ ± 0.8‰。在百年的时间尺度上，流星δ 18 O在较冷的时期（如海因里希天文台和7 ka左右的冷却事件）更负，而在较暖的时期（如高温变暖）负性较小。海水中~（18）O向降水中分馏的温度依赖性可能是温度与大气δ ~（18）O负相关的原因。此外，东亚夏季风（EASM）在暖期带来的降水量较大，δ 18 O负偏少;而东亚冬季风（EAWM）在冷期带来的降雪量较大，δ 18 O负偏多。东亚夏季风和东亚冬季风的相对影响在百年时间尺度上发生着变化。OT 02的δ 18 O反映了地面温度和大气δ 18 O的变化，两者与EASM和EAWM有较强的相关性。
Quantitative paleotemperature reconstruction is a challenging and important issue in paleoenvironmental studies, for which carbonate clumped isotope (Δ47) thermometry is a promising approach. Here we analyzed Δ47values from 66 layers of OT02 stalagmite from Ohtaki Cave in central Japan, covering two separate time intervals (2.6–8.8 and 34.8–63.5 ka) to reconstruct terrestrial temperature and meteoric δ18O records. The average Δ47temperatures of the Holocene interval and the latest Pleistonece interval were 16.3 °C ± 5.6 °C and 9.7 °C ± 4.6 °C, respectively. The Δ47thermometry also revealed that the cold intervals (5 °C–10 °C) correspond to the Heinrich stadials HSs4–6, and the warm interval (up to 19.9 °C ± 6.0 °C) in middle Holocene (approximately 6–5 ka) accompanied by the Hypsithermal climate optimum. We also reconstructed past meteoric δ18O by subtracting the temperature effect from stalagmite δ18O. Average meteoric δ18O was −8.2‰ ± 1.0‰ vs. VSMOW in the Holocene interval and − 8.8‰ ± 0.8‰ in the latest Pleistocene interval. Over centennial timescales, meteoric δ18O was more negative during colder periods, such as Heinrich stadials and a cooling event around 7 ka, and less negative in warmer periods, such as Hypsithermal warming. A temperature dependency of total18O fractionation from sea water to precipitation is a likely reason for the negative correlation between temperature and meteoric δ18O. Additionally, East Asian summer monsoon (EASM) brought larger rainfall of less negative δ18O during the warm periods, whereas larger snow/rainfall of more negative δ18O brought from East Asian winter monsoon (EAWM) in colder periods. The relative influences from EASM and EAWM were changing in a centennial timescale. δ18O of OT02 had reflected changes in terrestrial temperature and meteoric δ18O, which are both strongly related to EASM and EAWM.