Morphotype dependence of <i>Globigerinoides ruber</i> (white) and <i>Trilobatus sacculifer</i> Mg/Ca ratios in the western tropical Pacific: implications for reconstructing the mixed-layer depth

Qi Jia; Tiegang Li; Zhifang Xiong; Bingbin Qin

doi:10.1007/s13131-023-2163-0

Volume 42 Issue 11

Nov. 2023

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Qi Jia, Tiegang Li, Zhifang Xiong, Bingbin Qin. Morphotype dependence of Globigerinoides ruber (white) and Trilobatus sacculifer Mg/Ca ratios in the western tropical Pacific: implications for reconstructing the mixed-layer depth[J]. Acta Oceanologica Sinica, 2023, 42(11): 35-43. doi: 10.1007/s13131-023-2163-0

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Qi Jia, Tiegang Li, Zhifang Xiong, Bingbin Qin. Morphotype dependence of Globigerinoides ruber (white) and Trilobatus sacculifer Mg/Ca ratios in the western tropical Pacific: implications for reconstructing the mixed-layer depth[J]. Acta Oceanologica Sinica, 2023, 42(11): 35-43. doi: 10.1007/s13131-023-2163-0

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Morphotype dependence of Globigerinoides ruber (white) and Trilobatus sacculifer Mg/Ca ratios in the western tropical Pacific: implications for reconstructing the mixed-layer depth

doi: 10.1007/s13131-023-2163-0

Qi Jia¹,
Tiegang Li^{1, 2
,
,},
Zhifang Xiong^{1, 2},
Bingbin Qin¹

1.
First Institute of Oceanography, Ministry of Natural Resources, Qingdao 266061, China
2.
Laboratory for Marine Geology, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266061, China

Funds: The National Natural Science Foundation of China under contract Nos 41830539 and 41906063; the Marine S&T Fund of Shandong Province for Pilot National Laboratory for Marine Science and Technology (Qingdao) under contract No. 2022QNLM050203; the Taishan Scholars Project Funding under contract No. ts20190963.

More Information

Corresponding author: E-mail: tgli@fio.org.cn (T. Li)
Received Date: 2022-08-31
Accepted Date: 2022-12-30

Available Online: 2023-12-15

Publish Date: 2023-11-01

Abstract

Abstract

Planktonic foraminifer Globigerinoides ruber (white) and Trilobatus sacculifer are the most frequently used mixed-layer dwelling species for reconstructing past oceanic environments. Specifically, the Mg/Ca ratios of these two foraminiferal species have been used for reconstructing tropical/subtropical changes in sea surface temperature (SST). However, these two species have different morphotypes, of which the spatial and temporal differences in Mg/Ca ratios and their influencing factors are still unclear. Our objective is to investigate the potential differences between the Mg/Ca ratios of these different morphotypes of G. ruber (white) and T. sacculifer in the western Philippine Sea (WPS) and determine their implications for the reconstruction of SST and upper-ocean structure. Mg/Ca measurements are made on two basic morphotypes of G. ruber (white) [sensu stricto (s.s.) and sensu lato (s.l.)] and T. sacculifer [with (w) and without (w/o) a sac-like final chamber] on samples of Site MD06-3047B from the WPS. Our results reveal that Mg/Ca ratios of different G. ruber morphotypes show consistent differences; and those of T. sacculifer morphotypes show staged variations since MIS 3. It is suggested to select a single morphotype for reconstructing SST changes using the Mg/Ca ratios of G. ruber and T. sacculifer in the WPS. Furthermore, the Mg/Ca ratios between G. ruber s.s. and G. ruber s.l. [Δ(Mg/Ca)_{G.ruber s.s.−s.l.}] downcore MD06-3047B covaries with indexes of summer monsoon. Combining with the core-top results, showing regional variation of differences in the Δ(Mg/Ca)_{G.ruber s.s.−s.l.} over the western tropical Pacific, we propose that Δ(Mg/Ca)_{G.ruber s.s.−s.l.}may tend to reflect summer mixed layer depth.
- morphotypes,
- Globigerinoides ruber (white),
- Trilobatus sacculifer,
- Mg/Ca ratios,
- mixed-layer depth

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References(46)

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