Coupled nutricline and productivity variations during the Pliocene in the western Pacific warm pool and their paleoceanographic implications

Shi, Jingxue; Jia, Qi; Nürnberg, Dirk; Li, Tiegang; Xiong, Zhifang; Qin, Biao

doi:10.1016/j.gloplacha.2022.103810

Cited by 4 publications

(1 citation statement)

References 88 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The age model used for Site U1490 since ∼5.1 Ma was obtained by comparing the Cibicidoides wuellerstorfi δ 18 O (VPDB, Vienna Pee Dee Belemnite) curve and the standard LR04 stack (Lisiecki & Raymo, 2005), with additional five paleomagnetic constraints during the Pleistocene (Figure S2 in Supporting Information ). The stratigraphy for Site U1490 since 1.4 Ma and from 5.1 to 2.6 Ma used here were published previously (Qin, Jia, et al., 2022; Shi et al., 2022). The rest of the stratigraphy from 2.6 to 1.4 Ma was developed in the context of the present study.…”

Section: Methodsmentioning

confidence: 99%

Obliquity Pacing of Deep Pacific Carbonate Chemistry During the Plio‐Pleistocene

Qin,

Xiong,

Algeo

et al. 2024

Geophysical Research Letters

Self Cite

View full text Add to dashboard Cite

Reconstruction of the seawater carbonate system is essential for an improved understanding of glacial‐interglacial oceanic carbon cycling and climate change. However, continuous high‐resolution ocean carbonate chemistry data are generally lacking for the Plio‐Pleistocene. Here, we present a deep Pacific carbonate ion saturation state (Δ[CO32−]) record spanning the last 5.1 Myr, reconstructed from the size‐normalized shell weight of planktonic foraminifer in the western tropical Pacific. Deep Pacific Δ[CO32−] has been modulated primarily by orbital obliquity since 5.1 Ma, during which it has exhibited in‐phase behavior with the 40‐Kyr obliquity cycle. Significantly, the amplitude of the 40‐Kyr Δ[CO32−] cycles has responded linearly to obliquity forcing throughout the Plio‐Pleistocene, independent of the late Pliocene intensification of Northern Hemisphere glaciation. We speculate that the obliquity signal in the deep Pacific Δ[CO32−] record reflects an ocean‐atmosphere circulation feedback mediated by migration of the Southern Hemisphere Westerlies.

show abstract

Section: Methodsmentioning

confidence: 99%