IOCAS-IR  > 海洋地质与环境重点实验室
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
Guo, Jingteng1,3; Li, Tiegang2,4; Xiong, Zhifang2,4; Qiu, Xiaohua5; Chang, Fengming1,4
2019-09-01
Source PublicationACTA OCEANOLOGICA SINICA
ISSN0253-505X
Volume38Issue:9Pages:71-86
Corresponding AuthorLi, Tiegang(tgli@fio.org.cn) ; Xiong, Zhifang(zhfxiong@fio.org.cn)
AbstractThe 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 [CO32-] 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 urn) and Pulleniatina obliquiloculata (355-400 mu m) 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 (Delta[CO32-]) is weak, thus suggesting only a small dissolution effect on the B/Ca of the two species. The correlation coefficients (R-2) 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., [CO32-], DIC, ALK, pH and [HCO3-]) 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 mu m) 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 [CO32-] show an increase with time, and the record of subsurface seawater pCO(2) shows a decrease with time, in the tropical western Pacific over the past 24 ka. The consistent trends in subsurface seawater pCO(2) and opal flux during deglaciation may imply that the reported increase in subsurface water pCO(2) in the study area was promoted by enhanced upwelling in the Southern Ocean.
Keywordplanktonic foraminifera B Ca carbonate chemistry tropical western Pacific South China Sea
DOI10.1007/s13131-019-1476-y
Indexed BySCI
Language英语
Funding ProjectOpen Fund of Qingdao National Laboratory for Marine Science and Technology[QNLM2016ORP0205] ; Basic Scientific Fund for National Public Research Institutes of China[2017Y07] ; Basic Scientific Fund for National Public Research Institutes of China[2019S04] ; National Natural Science Foundation of China[41230959] ; National Natural Science Foundation of China[41830539] ; National Natural Science Foundation of China[91858106] ; National Natural Science Foundation of China[41576051] ; Taishan Scholars Project Funding ; Shandong Provincial Natural Science Foundation[ZR2016DQ17] ; Scientific and Technological Innovation Project of Qingdao National Laboratory for Marine Science and Technology[2016ASKJ13]
WOS Research AreaOceanography
WOS SubjectOceanography
WOS IDWOS:000485996200007
PublisherSPRINGER
Citation statistics
Document Type期刊论文
Identifierhttp://ir.qdio.ac.cn/handle/337002/162978
Collection海洋地质与环境重点实验室
Corresponding AuthorLi, Tiegang; Xiong, Zhifang
Affiliation1.Chinese Acad Sci, Inst Oceanol, CAS Key Lab Marine Geol & Environm, Qingdao 266071, Shandong, Peoples R China
2.Minist Nat Resources, Inst Oceanog 1, Qingdao 266061, Shandong, Peoples R China
3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
4.Pilot Natl Lab Marine Sci & Technol Qingdao, Lab Marine Geol & Environm, Qingdao 266237, Shandong, Peoples R China
5.1 Inst Geol & Mineral Resources Shandong Prov, Jinan 250014, Shandong, Peoples R China
First Author AffilicationInstitute of Oceanology, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Guo, Jingteng,Li, Tiegang,Xiong, Zhifang,et al. 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.
APA Guo, Jingteng,Li, Tiegang,Xiong, Zhifang,Qiu, Xiaohua,&Chang, Fengming.(2019).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.ACTA OCEANOLOGICA SINICA,38(9),71-86.
MLA Guo, Jingteng,et al."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".ACTA OCEANOLOGICA SINICA 38.9(2019):71-86.
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