Revisiting the dependence of thermocline-dwelling foraminiferal B/Ca on temperature and [CO_3~(2-)], and its application in reconstruction of the subsurface carbonate system in the tropical western Pacific since 24 ka
文献类型：CNKI期刊论文
| 作者 | Jingteng Guo ; Tiegang Li; Zhifang Xiong; Xiaohua Qiu; Fengming Chang
|
| 发表日期 | 2019-09-15 |
| 出处 | Acta Oceanologica Sinica
 |
| 关键词 | planktonic foraminifera B/Ca carbonate chemistry tropical western Pacific South China Sea |
| 英文摘要 | 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 [ CO_3~(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[ CO_3~(2-)]) 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.,[ CO_3~(2-)], DIC, ALK, pH and [ 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 [ CO_3~(2-)] 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. |
| 文献子类 | CNKI期刊论文 |
| 资助机构 | The Open Fund of Qingdao National Laboratory for Marine Science and Technology under contract No.QNLM2016ORP0205 ; the Basic Scientific Fund for National Public Research Institutes of China under contract Nos 2017Y07 and 2019S04 ; the National Natural Science Foundation of China under contract Nos 41230959,41830539,91858106 and 41576051 ; the Taishan Scholars Project Funding ; the Shandong Provincial Natural Science Foundation under contract No.ZR2016DQ17 ; the Scientific and Technological Innovation Project of Qingdao National Laboratory for Marine Science and Technology under contract No.2016ASKJ13 |
| 卷 | v.38期:09页:75-90 |
| 语种 | 英文; |
| 分类号 | P73;Q958.8 |
| ISSN号 | 0253-505X |
| 源URL | [http://ir.qdio.ac.cn/handle/337002/188454]  |
| 专题 | 中国科学院海洋研究所 |
| 作者单位 | 1.No.1InstituteofGeologyandMineralResourcesofShandongProvince 2.CASKeyLaboratoryofMarineGeologyandEnvironment,InstituteofOceanology,ChineseAcademyofSciences 3.UniversityofChineseAcademyofSciences 4.FirstInstituteofOceanography,MinistryofNaturalResources 5.LaboratoryforMarineGeologyandEnvironment,PilotNationalLaboratoryforMarineScienceandTechnology(Qingdao) |
| 推荐引用方式 GB/T 7714 | Jingteng Guo,Tiegang Li,Zhifang Xiong,et al. Revisiting the dependence of thermocline-dwelling foraminiferal B/Ca on temperature and [CO_3~(2-)], and its application in reconstruction of the subsurface carbonate system in the tropical western Pacific since 24 ka. 2019. |
入库方式： OAI收割
来源：海洋研究所
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