The relationship between volcanism and global climate changes in the Tropical Western Pacific over the mid-Pleistocene transition: Evidence from mercury concentration and isotopic composition

被引：1

作者：

Wang, Yipeng ^{[3
]}

Pei, Wenlong ^{[3
]}

Yang, Jialei ^{[3
]}

Fan, Yujin ^{[3
]}

Zhang, Rui ^{[1
,2
,3
,4
]}

Li, Tiegang ^{[5
,6
,7
]}

Russell, James ^{[4
]}

Zhang, Fan ^{[8
]}

Yu, Xiaoxiao ^{[9
]}

Hu, Junjie ^{[3
]}

Song, Yuehuo ^{[3
]}

Liu, Zhiyong ^{[10
]}

Guan, Minglei ^{[3
]}

Han, Qi ^{[11
]}

机构：

[1] Jiangsu Ocean Univ, Coinnovat Ctr Jiangsu Marine Bioind Technol, Lianyungang 222005, Jiangsu, Peoples R China

[2] Jiangsu Ocean Univ, Jiangsu Key Lab Marine Bioresources & Environm, Lianyungang 222005, Jiangsu, Peoples R China

[3] Jiangsu Ocean Univ, Sch Marine Technol & Geomat, Lianyungang 222005, Jiangsu, Peoples R China

[4] Brown Univ, Dept Earth Environm & Planetary Sci, Providence, RI 02912 USA

[5] Minist Nat Resources, Inst Oceanog 1, Qingdao 266061, Shandong, Peoples R China

[6] Qingdao Natl Lab Marine Sci & Technol, Lab Marine Geol, Qingdao 266061, Peoples R China

[7] Univ Chinese Acad Sci, Beijing 100049, Peoples R China

[8] Jiangsu Ocean Univ, Dept Chem Engn, Lianyungang 222005, Jiangsu, Peoples R China

[9] Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Guangzhou 510640, Peoples R China

[10] Soochow Univ, Med Coll, Sch Radiat Med & Protect, Suzhou 215123, Jiangsu, Peoples R China

[11] China Univ Geosci, Sch Ocean Sci, Beijing 100083, Peoples R China

来源：

SCIENCE OF THE TOTAL ENVIRONMENT | 2022年 / 823卷

基金：

中国国家自然科学基金;

关键词：

Mercury anomaly; Cyclicities; CO2; Climate; Volcanic activity; SOUTH CHINA; EXPLOSIVE VOLCANISM; CARBON; SEA; OCEAN; SEDIMENTS; EMISSIONS; RECORD; TEPHROSTRATIGRAPHY; FRAMEWORK;

D O I：

10.1016/j.scitotenv.2022.153482

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Volcanoes are a significant component of the Earth system, influencing the interaction between oceans and the atmosphere over large spatial and temporal scales. Being a volcanically dynamic region, the Tropical Western Pacific (TWP) can significantly impact variations in global climate. However, high-resolution continuous records of volcanic activity in this region are lacking, resulting in significant uncertainties regarding the coupling between the deep earth, climate changes, and atmospheric CO2 in the TWP. To address this issue, mercury (Hg) levels, isotopic compositions, and Hg/ total organic carbon (Hg/TOC) ratios were determined at site U1486 to track volcanic activity throughout the mid Pleistocene transition (MPT) from 1.3 Myr to 0.6 Myr. Our results of anomalously high Hg concentrations and Hg/ TOC ratios provide evidence of time-varying volcanism throughout the MPT. Mercury isotopes in the Hg-enriched sediments were characterized by near-zero Delta Hg-199 values, which is consistent with volcanism acting as the primary source of Hg to the sediments. Spectral analysis of the Hg/TOC ratio showed significant periodicity at similar to 100 kyr and similar to 23 kyr as well as a weaker signal at similar to 41 kyr consistent with Milankovitch cycles. A cross spectral analysis of Hg/TOC and the LR04 delta O-18 stack record suggests that the peak in volcanism lags the temperature minimum by similar to 6 kyr, and occurs prior to the delta O-18 minimum known as the glacial termination by similar to 14 +/- 2 kyr. The records of volcanic activity in this site are also consistent with a prominent rise in atmospheric CO2 and negative excursion of benthic carbon isotopes throughout the MPT. This study provides direct sedimentary evidence in the TWP of the feedback between volcanic activity, climate change and atmospheric CO2.

引用

页数：10