Enhanced ocean deoxygenation in the Bering Sea during MIS 11c

Feng，Xuguang1,2,6; Zou，Jianjun2,3; Shi，Xuefa2,3; Worne，Savannah4,5; Yao，Zhengquan2,3; Zhong，Yi7; Jin，Hualong8; Dong，Jiang2; Dong，Zhi2; Feng，Han2; Zou，Xinqing1,6

2024-03-01

10.1016/j.palaeo.2023.111982

Palaeogeography, Palaeoclimatology, Palaeoecology   影响因子和分区

0031-0182

Accelerated Arctic warming has raised concerns about future environmental conditions in the Bering Sea, one of the world's most productive marine ecosystems. Marine Isotope Stage (MIS) 11 (424–374 ka), a period with orbital parameters similar to those of the current interglacial (Holocene), is thought to be a suitable analog to predict future marine environments. Here, we reconstruct paleoredox changes in the Bering Sea over the last 800 kyr using high-resolution U/Th ratios from four sites, which were sampled by the Integrated Ocean Drilling Program (IODP) Expedition 323. During the early stages of MIS 11 (MIS11c), four IODP Expedition 323 sites (U1339, U1340, U1343, and U1345) with different water depths (1100–1900 m) had highly elevated U/Th ratios, indicating a substantial loss of dissolved oxygen (O) in the intermediate waters of the Bering Sea. High U/Th ratios were closely associated with extremely high %biogenic opal in the Bering Sea and an exceptionally warm Arctic climate. We speculate that during this period, the highest amplitude deglacial warming led to the onset of a super interglacial (MIS 11c) in the Arctic regions, via Arctic amplification. The exceptionally warm Arctic climate resulted in particularly high export productivity in the Bering Sea via physiological effects, a reduction in sea ice, and increased river discharge. Due to high productivity, increased organic matter degradation caused severe hypoxia in the intermediate waters of the Bering Sea. Our study shows that severe hypoxia may also appear in the Bering Sea if Arctic warming accelerates in the future.

Arctic warming Bering Sea Export productivity MIS 11c Severe hypoxia

英语

其他

GEOSCIENCES

2-s2.0-85181829811

Scopus

1.School of Geographic and Oceanographic Sciences,Collaborative Innovation Center of South China Sea Studies,Nanjing University,Nanjing,210093,China
2.Key Laboratory of Marine Geology and Metallogeny,First Institute of Oceanography,Ministry of Natural Resources,Qingdao,266061,China
3.Laboratory for Marine Geology,Laoshan Laboratory,Qingdao,266237,China
4.British Geological Survey,Keyworth,Nottingham,NG12 5GG,United Kingdom
5.University of Nottingham,Nottingham,NG7 2RD,United Kingdom
6.Key Laboratory for Coast and Island Development,Ministry of Education,Nanjing University,Nanjing,210093,China
7.Centre for Marine Magnetism (CM),Department of Ocean Science and Engineering,Southern University of Science and Technology,Shenzhen,518055,China
8.Key Laboratory of Marine Geology and Environment,Institute of Oceanology,Chinese Academy of Sciences,Qingdao,266071,China

Feng，Xuguang,Zou，Jianjun,Shi，Xuefa,et al. Enhanced ocean deoxygenation in the Bering Sea during MIS 11c[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2024,637.

Feng，Xuguang.,Zou，Jianjun.,Shi，Xuefa.,Worne，Savannah.,Yao，Zhengquan.,...&Zou，Xinqing.(2024).Enhanced ocean deoxygenation in the Bering Sea during MIS 11c.Palaeogeography, Palaeoclimatology, Palaeoecology,637.

Feng，Xuguang,et al."Enhanced ocean deoxygenation in the Bering Sea during MIS 11c".Palaeogeography, Palaeoclimatology, Palaeoecology 637(2024).