Variability of PDO identified by a last 300-year stalagmite δ18O record in Southwest China

QUATERNARY SCIENCE REVIEWS

卷:261

Article

Wang, Xuefeng^1,2  Duan, Wuhui^1,3  Tan, Ming¹  Cai, Binggui^4,5  Zhao, Jingyao⁶  Sha, Lijuan⁶  Ning, Youfeng⁶  Cheng, Hai^6,7,8  Wang, Lisheng^1,2,9  Ma, Zhibang¹  Edwards, R. Lawrence¹⁰  Xiao, Jule^1,3,9 

[1] Chinese Acad Sci, Inst Geol & Geophys, Key Lab Cenozo Geol & Environm, Beijing 100029, Peoples R China

[2] Chinese Acad Sci, Innovat Acad Earth Sci, Beijing 100029, Peoples R China

[3] CAS Ctr Excellence Life & Paleoenvironm, Beijing 100044, Peoples R China

[4] Fujian Normal Univ, Key Lab Humid Subtrop Ecogeog Proc, Minist Educ, Fuzhou 350007, Peoples R China

[5] Fujian Normal Univ, Inst Geog, Fuzhou 350007, Peoples R China

[6] Xi An Jiao Tong Univ, Inst Global Environm Change, Xian 710054, Peoples R China

[7] Chinese Acad Sci, Inst Earth Environm, State Key Lab Loess & Quaternary Geol, Xian 710061, Peoples R China

[8] CAGS, Key Lab Karst Dynam, Inst Karst Geol, MLR, Guilin 541004, Peoples R China

[9] Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China

[10] Univ Minnesota, Dept Earth & Environm Sci, Minneapolis, MN 55455 USA

关键词: Stalagmite;    Oxygen isotope;    Southwest China;    Pacific decadal oscillation;    Upstream depletion;   

DOI  :  10.1016/j.quascirev.2021.106947

来源: Elsevier

【 摘 要 】

Stalagmite oxygen isotope (delta O-18) record has been widely used in characterizing Asian Monsoon variations. In southwest (SW) China, although the stalagmite delta O-18 was usually suggested as a precipitation proxy, it remains a subject of debate. Here we present two replicated, high-precise-dated stalagmite delta O-18 records for the interval 1710-2003 AD from Yunnan province, SW China. The stalagmite delta O-18 shows no correlation with the local monsoon precipitation, but a significantly positive correlation with the Pacific Decadal Oscillation (PDO) index. It demonstrates that the stalagmite delta O-18 in SW China is most likely influenced by the atmospheric circulation associated with the PDO through the upstream depletion mechanism. During the warm (cold) PDO period, the deficit rainfall over India would make the delta O-18 of water vapor transporting to SW China less (more) negative due to the weaker Rayleigh distillation process, which would lead to the less (more) negative stalagmite delta O-18. Consequently, the stalagmite delta O-18 in SW China is suitable to reconstruct the PDO variations. It is important to note that the other factors, such as El Nino-Southern Oscillation (ENSO) or sea surface temperature (SST) also possibly affect the stalagmite delta O-18 in SW China, and the relationship between them requires further studies. (C) 2021 Elsevier Ltd. All rights reserved.

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