Revisiting the dependence of thermocline-dwelling foraminiferal B/Ca on temperature and [CO<sub>3</sub><sup>2-</sup>], and its application in reconstruction of the subsurface carbonate system in the tropical western Pacific since 24 ka

GUO Jingteng; LI Tiegang; XIONG Zhifang; QIU Xiaohua; CHANG Fengming

doi:10.1007/s13131-019-1476-y

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Article Navigation > Acta Oceanologica Sinica > 2019 > 38(9): 71-86

GUO Jingteng, LI Tiegang, XIONG Zhifang, QIU Xiaohua, CHANG Fengming. Revisiting the dependence of thermocline-dwelling foraminiferal B/Ca on temperature and [CO32-], and its application in reconstruction of the subsurface carbonate system in the tropical western Pacific since 24 ka[J]. Acta Oceanologica Sinica, 2019, 38(9): 71-86. doi: 10.1007/s13131-019-1476-y

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GUO Jingteng, LI Tiegang, XIONG Zhifang, QIU Xiaohua, CHANG Fengming. Revisiting the dependence of thermocline-dwelling foraminiferal B/Ca on temperature and [CO₃^2-], and its application in reconstruction of the subsurface carbonate system in the tropical western Pacific since 24 ka[J]. Acta Oceanologica Sinica, 2019, 38(9): 71-86. doi: 10.1007/s13131-019-1476-y

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Revisiting the dependence of thermocline-dwelling foraminiferal B/Ca on temperature and [CO₃^2-], and its application in reconstruction of the subsurface carbonate system in the tropical western Pacific since 24 ka

doi: 10.1007/s13131-019-1476-y

1.
CAS Key Laboratory of Marine Geology and Environment, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;University of Chinese Academy of Sciences, Beijing 100049, China
2.
First Institute of Oceanography, Ministry of Natural Resources, Qingdao 266061, China;Laboratory for Marine Geology and Environment, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266237, China
3.
No. 1 Institute of Geology and Mineral Resources of Shandong Province, Jinan 250014, China
4.
CAS Key Laboratory of Marine Geology and Environment, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;Laboratory for Marine Geology and Environment, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266237, China

Received Date: 2018-04-25

Abstract

Abstract

The B/Ca ratio of planktonic foraminifer shells has been used as a proxy for reconstructing past ocean carbonate chemistry. However, recent studies have revealed significant uncertainties associated with this proxy, such as whether seawater temperature or[CO₃^2-] is the dominant control on the partition coefficient (K_D) of planktonic foraminiferal B/Ca. To address these uncertainties and thus improve our understanding of the planktonic foraminiferal B/Ca proxy, we analysed B/Ca ratios in the tests of Neogloboquadrina dutertrei (300-355 μm) and Pulleniatina obliquiloculata (355-400 μm) in surface sediment samples from the tropical western Pacific and South China Sea. The relationship between these B/Ca ratios and bottom water calcite saturation states (Δ[CO₃^2-]) is weak, thus suggesting only a small dissolution effect on the B/Ca of the two species. The correlation coefficients (R²) between the B/Ca ratios of N. dutertrei and P. obliquiloculata and environmental parameters (e.g., temperature, salinity, phosphate, DIC and ALK) in the tropical western Pacific and South China Sea are not high enough to justify using B/Ca ratios as a palaeoenvironmental proxy in the study areas. The significant correlation between K_D values of N. dutertrei and P. obliquiloculata and carbonate system parameters (e.g.,[CO₃^2-], DIC, ALK, pH and[${\rm {HCO}}_3^{-}$]) in the study area reflect chemical links between the K_D denominator and these variables. Based on our surface sediment calibration, an empirical relationship between the K_D of N. dutertrei and temperature is proposed in the tropical western Pacific. We also generated a record of B/Ca ratios in N. dutertrei (300-355 μm) from Core MD06-3052 in the tropical western Pacific over the past 24 ka to evaluate the application of the revised B/Ca proxy method. Based on the reconstructed empirical relationship for B/Ca and subsurface seawater ALK, we estimated subsurface seawater carbonate system parameters in the tropical western Pacific since 24 ka. In general, the estimated subsurface seawater pH and[CO₃^2-] show an increase with time, and the record of subsurface seawater pCO₂ shows a decrease with time, in the tropical western Pacific over the past 24 ka. The consistent trends in subsurface seawater pCO₂ and opal flux during deglaciation may imply that the reported increase in subsurface water pCO₂ in the study area was promoted by enhanced upwelling in the Southern Ocean.
- planktonic foraminifera,
- B/Ca,
- carbonate chemistry,
- tropical western Pacific,
- South China Sea

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References(61)

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