Sediment geochemical records of productivity and oxygen depletion along the margin of western North America during the past 60,000 years: teleconnections with Greenland Ice and the Cariaco Basin

Dean, Walter E.

doi:10.1016/j.quascirev.2006.08.006

Cited by 47 publications

(38 citation statements)

References 91 publications

(183 reference statements)

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“…Given a known relationship between sediment physical property variation and high latitude climate variability at southern Baja California margin (Ortiz et al, 2004;Dean et al, 2006;Dean, 2007;Marchitto et al, 2007), we used a visual correlation of wet bulk density obtained from the GEOTEK logger and lightness obtained by spectrophotometry (Beaufort et al, 2002) to the NGRIP isotopic oxygen record (Johnsen et al, 2001) for the past 70 ka (see details in Leduc (2007), Cartapanis et al (2011) Blanchet et al (2007) additional tie point was added for the Blake magnetic excursion (115-122 ka) identified in MD08 core by Blanchet et al (2007) (see crosses at the top of Fig. 2 and Table 1).…”

Section: Methodsmentioning

confidence: 99%

“…The variability of the mid-latitude north Pacific OMZ during the last glacial period has been extensively studied (Hendy and Pedersen, 2005;Dean, 2007;Hendy, 2010;Cartapanis et al, 2011Cartapanis et al, , 2012. Most of these studies revealed a strong link between oxygen deficit in the northern Pacific and Northern Hemisphere high latitude climate on millennial timescales, with enhanced oxygen depletion and higher biological productivity during warm Dansgaard-Oeschger (DO) interstadial events, and enhanced oxygenation during Heinrich events (HE).…”

Section: O Cartapanis Et Al: Pacific Oxygen Minimum Zone Under Intementioning

confidence: 99%

“…A fundamental difference in oceanic circulation conditions between the MIS5 and the last glacial period is related to sea level, which affected the communication between the Arctic Ocean and the northern Pacific through the Bering Strait (De Boer and Nof, 2004). Modelling studies indicate that the impact of Heinrich-like events on oceanic circulation over both northern Atlantic and Pacific oceans might have been reduced during interglacial periods (De Boer and Nof, 2004;Hu et al, 2012).…”

Section: Oceanic Circulation Impact On Oxygenation and Productivitymentioning

confidence: 99%

“…Modelling studies indicate that the impact of Heinrich-like events on oceanic circulation over both northern Atlantic and Pacific oceans might have been reduced during interglacial periods (De Boer and Nof, 2004;Hu et al, 2012). During sea level high stands, any increase of the freshwater inputs in the northern Atlantic was partially diverted toward the northern Pacific through the still open Bering Strait, thus weakening the impact of HE on the North Atlantic Deep Water (De Boer and Nof, 2004;Hu et al, 2012). At the same time, freshwater influx into the northern Pacific probably reduced NPIW formation.…”

Section: Oceanic Circulation Impact On Oxygenation and Productivitymentioning

confidence: 99%

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Persistent millennial-scale link between Greenland climate and northern Pacific Oxygen Minimum Zone under interglacial conditions

Cartapanis

Tachikawa²,

Romero³

et al. 2014

Clim. Past

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Abstract. The intensity and/or extent of the northeastern Pacific Oxygen Minimum Zone (OMZ) varied in-phase with the Northern Hemisphere high latitude climate on millennial timescales during the last glacial period, indicating the occurrence of atmospheric and oceanic connections under glacial conditions. While millennial variability was reported for both the Greenland and the northern Atlantic Ocean during the last interglacial period, the climatic connections with the northeastern Pacific OMZ has not yet been observed under warm interglacial conditions. Here we present a new geochemical dataset, spanning the past 120 ka, for major components (terrigenous fraction, marine organic matter, biogenic opal, and carbonates) generated by X-ray fluorescence scanning alongside with biological productivity and redox sensitive trace element content (Mo, Ni, Cd) of sediment core MD02-2508 at 23 • N, retrieved from the northern limit of the modern OMZ. Based on elemental ratios Si / Ti (proxy for opal), Cd / Al and Ni / Al, we suggest that biological productivity was high during the last interglacial (MIS5). Highly resolved opal reconstruction presents millennial variability corresponding to all the Dansgaard-Oeschger interstadial events over the last interglacial, while the Mo / Al ratio indicates reduced oxygenation during these events. Extremely high opal content during warm interstadials suggests high diatom productivity. Despite the different climatic and oceanic background between glacial and interglacial periods, rapid variability in the northeastern Pacific OMZ seems to be tightly related to Northern Hemisphere high latitude climate via atmospheric and possibly oceanic processes.

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Section: Methodsmentioning

confidence: 99%

Section: O Cartapanis Et Al: Pacific Oxygen Minimum Zone Under Intementioning

confidence: 99%

Section: Oceanic Circulation Impact On Oxygenation and Productivitymentioning

confidence: 99%

Section: Oceanic Circulation Impact On Oxygenation and Productivitymentioning

confidence: 99%

See 2 more Smart Citations

Persistent millennial-scale link between Greenland climate and northern Pacific Oxygen Minimum Zone under interglacial conditions

Cartapanis

Tachikawa²,

Romero³

et al. 2014

Clim. Past

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“…From a mechanistic perspective, this approach builds from clear evidence that the burial in sediments of many redox sensitive metals in anoxic settings scales strongly with carbon flux to the sediments (18,41,42). We hold that this approach allows for a more realistic depiction of perturbations to seawater metal inventories as a function of seafloor redox dynamics by smoothly decreasing globally averaged burial rates as larger regions of the seafloor become anoxic (Cr) or sulfidic (Mo).…”

Section: Interpreting the Enrichment Record: Model For Global Mass Bamentioning

confidence: 99%

Proterozoic ocean redox and biogeochemical stasis

Reinhard

Planavsky

Robbins

et al. 2013

Proc. Natl. Acad. Sci. U.S.A.

444

407

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The partial pressure of oxygen in Earth's atmosphere has increased dramatically through time, and this increase is thought to have occurred in two rapid steps at both ends of the Proterozoic Eon (∼2.5-0.543 Ga). However, the trajectory and mechanisms of Earth's oxygenation are still poorly constrained, and little is known regarding attendant changes in ocean ventilation and seafloor redox. We have a particularly poor understanding of ocean chemistry during the mid-Proterozoic (∼1.8-0.8 Ga). Given the coupling between redoxsensitive trace element cycles and planktonic productivity, various models for mid-Proterozoic ocean chemistry imply different effects on the biogeochemical cycling of major and trace nutrients, with potential ecological constraints on emerging eukaryotic life. Here, we exploit the differing redox behavior of molybdenum and chromium to provide constraints on seafloor redox evolution by coupling a large database of sedimentary metal enrichments to a mass balance model that includes spatially variant metal burial rates. We find that the metal enrichment record implies a Proterozoic deep ocean characterized by pervasive anoxia relative to the Phanerozoic (at least ∼30-40% of modern seafloor area) but a relatively small extent of euxinic (anoxic and sulfidic) seafloor (less than ∼1-10% of modern seafloor area). Our model suggests that the oceanic Mo reservoir is extremely sensitive to perturbations in the extent of sulfidic seafloor and that the record of Mo and chromium enrichments through time is consistent with the possibility of a Mo-N colimited marine biosphere during many periods of Earth's history.paleoceanography | geobiology

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Vertical oxygen minimum zone oscillations since 20 ka in Santa Barbara Basin: A benthic foraminiferal community perspective

et al. 2014

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[1] Here we present a history of deoxygenation of upper intermediate waters during the last deglaciation from Santa Barbara Basin (SBB), based on quantitative analyses of benthic foraminiferal assemblages, from a new shallow piston core above basin sill depth (MV0811-15JC, 418 m), and previously described sequences in the deeper basin (MD02-2504, 481 m and MD02-2503, 570 m). We document a 152 m depth transect of benthic foraminiferal assemblages to extract changing community structure (density, diversity, and evenness) and improve paleoenvironmental interpretation of late Quaternary vertical oscillations in the upper boundary of the oxygen minimum zone (OMZ). Close interaction between changes in open margin OMZ and that of the restricted SBB is documented using these quantitative techniques. MV0811-15JC, while being unlaminated, contains strongly hypoxic foraminiferal assemblages (including species Bolivina tumida and Nonionella stella), coeval with preserved sediment laminations in the deeper cores. Last Glacial Maximum (LGM) assemblages across this transect contained oxic fauna and high diversity. At 14.7 ka, glacial termination IA, hypoxic benthic fauna appeared across the transect, recording hypoxic waters (<0.5 ml L À1 ) < 300 m from the ocean surface. Bølling/Allerød (B/A) assemblages uniquely stand out in the record, exhibited by low density, diversity, and evenness, and taxonomic composition reflecting extreme and stressful hypoxia and methane-rich environments. Younger Dryas assemblages were diverse and composed of oxic fauna, similar to LGM assemblages. Termination IB initiated another deoxygenation shift, followed by OMZ-associated faunal and density patterns. This analysis strengthens the quantitative assessment of oxygen concentrations involved in deglacial OMZ change and reveals the unexpected, remarkable shallowness of OMZ influence during the B/A.

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Sediment geochemical records of productivity and oxygen depletion along the margin of western North America during the past 60,000 years: teleconnections with Greenland Ice and the Cariaco Basin

Cited by 47 publications

References 91 publications

Persistent millennial-scale link between Greenland climate and northern Pacific Oxygen Minimum Zone under interglacial conditions

Persistent millennial-scale link between Greenland climate and northern Pacific Oxygen Minimum Zone under interglacial conditions

Proterozoic ocean redox and biogeochemical stasis

Vertical oxygen minimum zone oscillations since 20 ka in Santa Barbara Basin: A benthic foraminiferal community perspective

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