Millennial-scale iron fertilization of the eastern equatorial Pacific over the past 100,000 years

Loveley, M. R.; Marcantonio, Franco; Wisler, Marilyn M.; Hertzberg, J. E.; Schmidt, M. W.; Lyle, Mitchell W

doi:10.1038/ngeo3024

Cited by 37 publications

(90 citation statements)

References 53 publications

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“…The increase in oxygenation was possibly associated with the stronger intermediate waters ventilation due to deepening and strengthening of the NPIW (Ahagon et al, 2003;Max et al, 2014). However, most U auth records in deep Pacific Ocean show the highest concentrations during the LGM and minima during the Holocene (Bradtmiller et al, 2010;Galbraith et al, 2007 ;Jaccard & Galbraith, 2012Loveley et al, 2017) (Figures 3d and 3e). Authigenic U concentrations in conjunction with contemporaneous biogenic opal flux data could be only ascribed to the increase in deep water oxygen concentrations from the last glaciation to the Holocene (Bradtmiller et al, 2010;Galbraith et al, 2007;Loveley et al, 2017).…”

Section: The Oxygenation History Between the Scs And Ot/open Pacific mentioning

confidence: 96%

“…However, most U auth records in deep Pacific Ocean show the highest concentrations during the LGM and minima during the Holocene (Bradtmiller et al, 2010;Galbraith et al, 2007 ;Jaccard & Galbraith, 2012Loveley et al, 2017) (Figures 3d and 3e). Authigenic U concentrations in conjunction with contemporaneous biogenic opal flux data could be only ascribed to the increase in deep water oxygen concentrations from the last glaciation to the Holocene (Bradtmiller et al, 2010;Galbraith et al, 2007;Loveley et al, 2017). The increase in oxygenation of the PDW is consistent with the decrease in ventilation ages which were widely reported for the open Pacific Ocean (De La Fuente et al, 2015;Galbraith et al, 2007;Skinner et al, 2010).…”

Section: The Oxygenation History Between the Scs And Ot/open Pacific mentioning

confidence: 99%

“…A few modeling studies suggested that the breakdown of the permanent halocline in the subarctic Pacific created well‐ventilated dense waters sinking to a depth of ~2,500 to 3,000 m during the Heinrich Stadial 1 (HS1) and the Younger Dryas (YD) when the Atlantic meridional overturning circulation weakened (Menviel et al, ; Okazaki et al, ). However, a few benthic 14 C data (Cook & Keigwin, ; Galbraith et al, ; Lund, ) and deep water oxygenation records (Bradtmiller et al, ; Galbraith et al, ; Jaccard & Galbraith, ; Loveley et al, ) indicated the absence of direct deep water formation in North Pacific during the HS1 and YD stadials. More data are needed to fully understand the extent to which the intermediate and deep Pacific circulation have changed during the deglacial period.…”

Section: Introductionmentioning

confidence: 99%

“…A few modeling studies suggested that the breakdown of the permanent halocline in the subarctic Pacific created well- ventilated dense waters sinking to a depth of~2,500 to 3,000 m during the Heinrich Stadial 1 (HS1) and the Younger Dryas (YD) when the Atlantic meridional overturning circulation weakened Okazaki et al, 2010). However, a few benthic 14 C data (Cook & Keigwin, 2015;Galbraith et al, 2007;Lund, 2013) and deep water oxygenation records (Bradtmiller et al, 2010;Galbraith et al, 2007;Jaccard & Galbraith, 2013;Loveley et al, 2017) Figure 1a). The SCS Deep Water (SCSDW) is oxygen rich and well ventilated at present (Wang et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

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Changes in Deep Water Oxygenation of the South China Sea Since the Last Glacial Period

Chen

Rashid

Zhong

et al. 2018

Geophysical Research Letters

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The Pacific meridional overturning circulation is thought to have a significant influence on global climate. However, the extent to which intermediate and deep circulations have changed in the Pacific Ocean since the Last Glacial Maximum (LGM) is not well known. At present, the South China Sea Deep Water (SCSDW) is fed by the upper Pacific Deep Water. Here we present new benthic foraminiferal δ13C and redox‐sensitive elemental data from a sediment core retrieved from the southern deep SCS to reconstruct the oxygenation history of the SCSDW since the LGM. Oxygenation records from the deep SCS and intermediate and deep waters in the Pacific Ocean demonstrate that the SCSDW deeper than 1,600 m has been sourced by the Pacific Deep Water since the LGM. Our data suggest that the well‐ventilated North Pacific Intermediate Water would not have influenced the SCSDW during cold stadials of the last deglacial period.

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Section: The Oxygenation History Between the Scs And Ot/open Pacific mentioning

confidence: 96%

Section: The Oxygenation History Between the Scs And Ot/open Pacific mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Changes in Deep Water Oxygenation of the South China Sea Since the Last Glacial Period

Chen

Rashid

Zhong

et al. 2018

Geophysical Research Letters

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“…There have been several studies which have determined changes in dust fluxes to the equatorial Pacific through the last climate cycles (e.g., Anderson et al, ; Costa et al, ; Kienast et al, ; Loveley et al, ; McGee et al, ; Pichat et al, ; Winckler et al, ). Some have used this information to reconstruct movements of the ITCZ on millennial (Jacobel et al, ; Loveley et al, ) and glacial‐interglacial timescales (Jacobel, McManus, et al, ), but few studies combine equatorial Pacific flux estimates with radiogenic isotope data, which can highlight possible dust sources (Pichat et al, ; Xie & Marcantonio, ). Here, that approach allows us to evaluate changes in the provenance of dust delivered to the CEP at 158°W along a transect from 0.48°N to 7.04°N.…”

Section: Introductionmentioning

confidence: 99%

The Penultimate Glacial Termination and Variability of the Pacific Intertropical Convergence Zone

Reimi

Marcantonio

Lynch‐Stieglitz

et al. 2019

Geophysical Research Letters

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Understanding how the Intertropical Convergence Zone (ITCZ) responds to abrupt climate change is essential for reconstructing large‐scale atmospheric circulation across climate transitions. However, key differences between dynamical models and observational constraints on ITCZ movement remain unresolved. Here, we examine the Pb and Nd radiogenic isotope signatures of dust deposited in the central equatorial Pacific (CEP) from 160 to 105 kyr. We quantified the relative contributions of Northern Hemisphere‐ and Southern Hemisphere‐sourced dust to the CEP. In contrast with previous model estimates, we demonstrate that South America is an important source of dust to the CEP during glacial periods. Our new observations provide a critical data set for verifying dynamical arguments about tropical hydroclimate. We infer that the southernmost position of the ITCZ precipitation centroid occurs between 136 and 131 kyr, coincident with the timing of North Atlantic Heinrich Stadial Event 11 (136 to 129 kyr).

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Coeval Decline of Biological Productivity and Bottom-water Oxygenation in EEP Ocean Recorded by Magnetofossils during the Antarctic Glaciation

Wang

Yang

Gai

et al. 2022

Preprint

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The biological pump and deep-ocean ventilation in eastern equatorial Pacific (EEP) Ocean are thought to play a crucial role in cases of global CO2 change. However, the integral role of these two processes in regulating atmospheric CO2 perturbations over major climate transitions are still unknown. Here, we present the magnetofossil record in EEP sediments from Sites 1333 and 1218 across the Eocene-Oligocene Transition (EOT) when the major ice-sheet was first established on Antarctica. We find that the EEP dust fertilization and bottom-water oxygenation were well co-archived by magnetofossil in characteristics of abundance and morphology, respectively. Our observations show a coeval decline of EEP biological productivity and deep-ocean ventilation during the Antarctic glacial expansion, and suggest that the reduced deep-ocean ventilation contributed to the global CO2 decline across the EOT, whereas the superimposed biological pump action provided a negative (stabilizing) feedback in the meantime.

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Millennial-scale iron fertilization of the eastern equatorial Pacific over the past 100,000 years

Cited by 37 publications

References 53 publications

Changes in Deep Water Oxygenation of the South China Sea Since the Last Glacial Period

Changes in Deep Water Oxygenation of the South China Sea Since the Last Glacial Period

The Penultimate Glacial Termination and Variability of the Pacific Intertropical Convergence Zone

Coeval Decline of Biological Productivity and Bottom-water Oxygenation in EEP Ocean Recorded by Magnetofossils during the Antarctic Glaciation

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