The response of nitrogen and sulfur cycles to ocean deoxygenation across the Cenomanian-Turonian boundary

Ruixiang Zhai; Zhiyu Zeng; Ruiling Zhang; Weiqi Yao

2023-08-01

10.1016/j.gloplacha.2023.104182

GLOBAL AND PLANETARY CHANGE   影响因子和分区

0921-8181

1872-6364

The Cretaceous Oceanic Anoxic Event 2 (OAE2) is a greenhouse episode of severe marine anoxia at the Cenomanian-Turonian boundary. This time interval is characterized by rising sea surface temperature, enhanced marine biological productivity, and widespread occurrence of organic-rich black shales. With an export of biological production to the deep ocean, organisms consume vast amounts of oxygen and subsequently utilize nitrate and sulfate as electron acceptors in organic matter degradation, thereby affecting biogeochemical cycles of nitrogen and sulfur. However, due to a lack of comprehensive compilation of global records, the temporal and spatial distribution of oceanic oxygen loss is yet to elucidate. To bridge this gap, this review summarizes the published marine nitrogen and sulfur isotope data sets from worldwide locations across the CenomanianTuronian boundary. The compiled records suggest that anoxic and euxinic waters have initially developed on the southern edge of the proto-North Atlantic before the OAE2 and spread to open oceans of the proto-North Atlantic, epicontinental seas of the Western Tethys and Western Interior Seaway at the onset of the OAE2. Meanwhile, sites above the storm base and in deep seas of the Tethys remain relatively oxic throughout the time. We suggest that distinct nutrient levels and circulation structures primarily control the regional difference in marine redox states. Our findings depict the evolutionary history of ocean deoxygenation and biogeochemical cycles during the past hyperthermal event, with implications for how future global warming may impact seawater chemistry and marine ecosystems.

Oceanic Anoxic Event 2 Cenomanian-Turonian boundary Ocean deoxygenation Nitrogen cycle Sulfur cycle

SCI ; EI

英语

第一 ; 共同第一 ; 通讯

National Key Research and Development Program of China[2022YFF0802900]

Physical Geography ; Geology

Geography, Physical ; Geosciences, Multidisciplinary

WOS:001034518400001

ELSEVIER

20232714346160

Biogeochemistry ; Ecosystems ; Nitrogen ; Oceanography ; Sulfur ; Sulfur compounds ; Surface temperature ; Surface waters

Atmospheric Properties:443.1 ; Surface Water:444.1 ; Ecology and Ecosystems:454.3 ; Oceanography, General:471.1 ; Geochemistry:481.2 ; Thermodynamics:641.1 ; Biochemistry:801.2 ; Chemical Products Generally:804

GEOSCIENCES

Web of Science

Department of Ocean Science and Engineering, Southern University of Science and Technology, Shenzhen, China

Ruixiang Zhai,Zhiyu Zeng,Ruiling Zhang,et al. The response of nitrogen and sulfur cycles to ocean deoxygenation across the Cenomanian-Turonian boundary[J]. GLOBAL AND PLANETARY CHANGE,2023,227.

Ruixiang Zhai,Zhiyu Zeng,Ruiling Zhang,&Weiqi Yao.(2023).The response of nitrogen and sulfur cycles to ocean deoxygenation across the Cenomanian-Turonian boundary.GLOBAL AND PLANETARY CHANGE,227.

Ruixiang Zhai,et al."The response of nitrogen and sulfur cycles to ocean deoxygenation across the Cenomanian-Turonian boundary".GLOBAL AND PLANETARY CHANGE 227(2023).