Paleoceanographic changes in the East China Sea during the last ~400 kyr reconstructed using planktic foraminifera

Vats, Nishant; Mishra, Sibasish; Singh, Raj K.; Gupta, Anil K.; Pandey, Dhananjai K.

doi:10.1016/j.gloplacha.2020.103173

Cited by 22 publications

(40 citation statements)

References 69 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Planktic foraminiferal biostratigraphy and taxonomy are the foundations for providing firstorder relative age control in deep-sea sediments, understanding open marine evolutionary dynamics, and reconstructing ocean-climate history (e.g. [1][2][3][4][5][6]). Historically, the equatorial and tropical regions have been studied in great detail with respect to plankton evolutionary events and construction of biozones (reviewed in [1]), with the tropical planktic foraminiferal zones and subzones now tuned to the astronomical and geomagnetic timescales [1,2].…”

Section: Introductionmentioning

confidence: 99%

Subtropical to temperate late Neogene to Quaternary planktic foraminiferal biostratigraphy across the Kuroshio Current Extension, Shatsky Rise, northwest Pacific Ocean

Lam

Leckie

2020

PLoS ONE

View full text Add to dashboard Cite

Planktic foraminiferal biostratigraphic zonation schemes are critical for providing first-order relative age control in deep-sea sediments and provide the basis on which to interpret evolutionary dynamics through time. Over the previous decades, the majority of published biostratigraphic zonation schemes focused on the tropical regions of the world. The mid-latitude or temperate regions, especially of the northwest Pacific, have been understudied in terms of recording plankton occurrences. Lack of detailed biostratigraphic studies have largely left out this region from plankton evolutionary analyses, thus how this part of the world ocean, which is characterized by the Kuroshio Current Extension (KCE), may contribute to global plankton biodiversity is unknown. In this study, we present the first magnetostratigraphically-calibrated late Neogene to Quaternary (15.12-0 Ma) planktic foraminiferal zonation schemes from the northwest Pacific for three Ocean Drilling Program Leg 198 holes (1207A, 1208A, and 1209A) that span the KCE. We utilize previously published warm subtropical, cool subtropical, and temperate zonation schemes from the southwest Pacific, with modifications. We find examples of significant diachroneity among primary marker taxa used to construct biozones at the three northwest Pacific sites, which ranges from 0.075 to 2.29 million years. Comparison of our primary datum markers with those of the tropical planktic foraminiferal zonation scheme also reveal diachroneity on the scale of 0.022 to 4.8 million years. We have identified times of intense dissolution in the northwest Pacific, namely in the middle to late Miocene that likely contribute to the observed diachroneity of datums. This study highlights the need for regionally specific mid-latitude biostratigraphic zonation schemes, as diachronous datums and differing assemblages may be hallmarks of oceanic ecotones created by major boundary current systems. These data also provide a framework to characterize local plankton evolutionary dynamics and paleobiogeographic patterns in future studies.

show abstract

Section: Introductionmentioning

confidence: 99%

Subtropical to temperate late Neogene to Quaternary planktic foraminiferal biostratigraphy across the Kuroshio Current Extension, Shatsky Rise, northwest Pacific Ocean

Lam

Leckie

2020

PLoS ONE

View full text Add to dashboard Cite

show abstract

“… (a) Benthic foraminiferal biofacies, (b) Dysoxic species abundance (%), (c) Benthic foraminiferal diversity as Shannon Index (h), (d) Oxic radiolarian species C. davisiana (%) (Matsuzaki et al., 2019), (e) Kuroshio Current Index‐ Factor 4 loading (Vats et al., 2020), (f) δ 13 C pf (‰) (Clemens et al., 2018) at Site U1429, and (g) Composite Chinese cave δ 18 O (‰) as Asian Monsoon indicator (Cheng et al., 2016) and (h) Late Pleistocene Sea level stack (Spratt & Lisiecki, 2016). Dark blue lines mark termination events T‐I, T‐II, T‐III, and T‐IV.…”

Section: Resultsmentioning

confidence: 99%

“…The upper part of the succession (back to 40 ka) was further constrained by 16 AMS 14 C dates (10 from Vats et al., 2020 and 6 from D. Zhao et al., 2017). The average temporal resolution per sample is ∼2 kyr (Vats et al., 2020). The same age model was also used to plot TOC (%), CaCO 3 (%) (Black et al., 2018), δ 13 C pf and δ 18 O bf (Clemens et al., 2018) and the Cycladophora davisiana (%) abundance data (Matsuzaki et al., 2019).…”

Section: Methodsmentioning

confidence: 99%

“…The spectrum was bias‐corrected using the Monte Carlo simulation option (Schulz & Mudelsee, 2002). Further, the cross spectral analysis of oxic genus Quinqueloculina (%), suboxic genus Bulimina (%), dysoxic genus Globobulimina (%) with U1429 δ 18 O Seawater , U1429 δ 13 C pf (Clemens et al., 2018), and Kuroshio Current Index‐ Factor 4 loading (Vats et al., 2020) and among these parameters, were performed in Analyseries 2.0.4 (Paillard et al., 1996). The analysis was performed using the Blackman‐Tukey method with 50% lag and Bartlett window at 80% confidence level.…”

Section: Methodsmentioning

confidence: 99%

“…The KC intrusion into the ECS is seasonally controlled by volume transport fluctuations (Z. Liu et al., 2021; Zhou, Song, Yuan, Wang, et al., 2018) in the transport of warm, highly saline waters from low to middle latitudes (D. Hu et al., 2015; D. Zhao et al., 2017; Zheng et al., 2016). The KC brings oxygen‐rich, warm, saline, and oligotrophic water to the ECS from the north equatorial Pacific region (Gallagher et al., 2015; Lee et al., 2001; Matsuzaki et al., 2016, 2019; Vats et al., 2020), while subsurface KC‐driven upwelling (Chen, 1996; Chen et al., 1995; K. K. Liu et al., 1992; Vats et al., 2020; Wu et al., 2008; Zhou, Song, Yuan, Cao, et al., 2018) brings nutrients and influences primary productivity. The nutrient rich TC flows in to the ECS (Matsuzaki et al., 2019) from the Taiwan strait and increases the productivity in the continental shelf areas of the ECS, however, its influence gets restricted to the western part of the ECS.…”

Section: Site Location and Oceanographic Settingmentioning

confidence: 99%

See 2 more Smart Citations

Linkages Between East China Sea Deep‐Sea Oxygenation and Variability in the East Asian Summer Monsoon and Kuroshio Current Over the Last 400,000 years

Vats

Singh

Das

et al. 2021

Paleoceanog and Paleoclimatol

Self Cite

View full text Add to dashboard Cite

The East China Sea (ECS) seasonally receives a high organic input due to the terrestrial organic matter influx, which is controlled by the East Asian Summer Monsoon (EASM), and the increased productivity driven by upwelling of the subsurface Kuroshio Current (KC). Changes in benthic foraminiferal assemblage composition in combination with paleoceanographic proxy data (CaCO3 (%), TOC (%), δ13Cpf, and δ18Obf) are used to reconstruct bottom water oxygenation and organic export flux variability over the last 400 kyr in the ECS. Multivariate analyses of benthic foraminiferal census data identified six biofacies characteristic of varying environmental conditions. These results suggest that enhanced EASM precipitation and KC upwelling directly influenced organic export flux and bottom water oxygen content in the ECS. The ECS bottom water was suboxic during Marine Isotope Stage (MIS) 11 to 8; suboxic to dysoxic between MIS 7 and 6, strongly dysoxic between mid‐MIS 5 and 4, and exhibited high variability between MIS 3 and 1. Spectral analysis of relative abundances of representative genera Quinqueloculina (oxic), Bulimina (suboxic), and Globobulimina (dysoxic) reveals a robust 23 kyr signal, which we attribute to precessionally‐paced changes in surface productivity and bottom water oxygenation related to KC variability over the past 400 kyr.

show abstract

Linkages between East China Sea Deep-sea Oxygenation and the Variability of the East Asian Summer Monsoon and Kuroshio Current over last 400,000 years

Vats

Singh

Das

et al. 2021

Preprint

View full text Add to dashboard Cite

The East China Sea (ECS) seasonally receives a high organic input due to the terrestrial organic matter influx, which is controlled by the East Asian Summer Monsoon (EASM), and the increased productivity driven by upwelling of the subsurface Kuroshio Current (KC). Changes in benthic foraminiferal assemblage composition in combination with paleoceanographic proxy data (CaCO3 (%), TOC (%), δ 13 Cpf, and δ 18 Obf) are used to reconstruct bottom water oxygenation and organic export flux variability over the last 400 kyr in the ECS. Multivariate analyses of benthic foraminiferal census data identified six biofacies characteristic of varying environmental conditions. These results suggest that enhanced EASM precipitation and KC upwelling directly influenced organic export flux and bottom water oxygen content in the ECS. The ECS bottom water was suboxic during Marine Isotope Stage (MIS) 11 to 8; suboxic to dysoxic between MIS 7 and 6, strongly dysoxic between mid-MIS 5 and 4, and exhibited high variability between MIS 3 and 1. Spectral analysis of relative abundances of representative genera Quinqueloculina (oxic), Bulimina (suboxic), and Globobulimina (dysoxic) reveals a robust 23 kyr signal, which we attribute to precessionally-paced changes in surface productivity and bottom water oxygenation related to KC variability over the past 400 kyr.

show abstract

Paleoceanographic changes in the East China Sea during the last ~400 kyr reconstructed using planktic foraminifera

Cited by 22 publications

References 69 publications

Subtropical to temperate late Neogene to Quaternary planktic foraminiferal biostratigraphy across the Kuroshio Current Extension, Shatsky Rise, northwest Pacific Ocean

Subtropical to temperate late Neogene to Quaternary planktic foraminiferal biostratigraphy across the Kuroshio Current Extension, Shatsky Rise, northwest Pacific Ocean

Linkages Between East China Sea Deep‐Sea Oxygenation and Variability in the East Asian Summer Monsoon and Kuroshio Current Over the Last 400,000 years

Linkages between East China Sea Deep-sea Oxygenation and the Variability of the East Asian Summer Monsoon and Kuroshio Current over last 400,000 years

Contact Info

Product

Resources

About