Nutrient and oceanographic changes in the Eastern Equatorial Pacific from the last full Glacial to the Present

Loubere, Paul

doi:10.1016/s0921-8181(00)00085-0

Cited by 42 publications

(78 citation statements)

References 58 publications

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“…Ventilation of that CO 2 would have started in the early deglacial as indicated by oceanwide decreases in carbon isotope values preserved in benthic and planktonic foraminifera ( Fig. 3; Loubere, 2001;Spero and Lea, 2002).…”

Section: Figmentioning

confidence: 97%

“…Thermocline nutrient content in the EEP over the past 30,000 years has been investigated using the carbon isotope record of the thermocline dwelling planktonic foraminiferan Neogloboquadrina dutertrei compared to that of mixed layer species (Loubere, 2001;. This has been compared directly to proxies of biological productivity and sea surface temperature in Loubere and Fariduddin (2008).…”

Section: Glacial-interglacial Change In the Eastern Equatorial Pacificmentioning

confidence: 99%

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Southern Ocean biogeochemical impact on the tropical ocean: Stable isotope records from the Pacific for the past 25,000 years

Loubere

Bennett

2008

Global and Planetary Change

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Section: Figmentioning

confidence: 97%

Section: Glacial-interglacial Change In the Eastern Equatorial Pacificmentioning

confidence: 99%

Southern Ocean biogeochemical impact on the tropical ocean: Stable isotope records from the Pacific for the past 25,000 years

Loubere

Bennett

2008

Global and Planetary Change

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“…The intermediate water is injected into the thermocline at the northern edge of the Antarctic Circumpolar Current and moves northward, becoming entrained in and transported to the east by the EUC. In a general sense, the tropical thermocline dweller N. dutertrei may therefore record changes in the Pliocene nutrient and carbon isotopic chemistry of waters at the Polar Front and/or Subantarctic Front, as the source of the EUC is derived from SAMW/AAIW (Toggweiler et al, 1991;Loubere, 2000Loubere, , 2001. Spero and Lea (2002) and Spero et al (2003), for instance, interpreted Pleistocene δ 13 C records of N. dutertrei near the Galapagos Islands to reflect high-latitude δ 13 C changes.…”

Section: S Steph Et Al Tropical East Pacific Upper Ocean Stratificamentioning

confidence: 99%

Pliocene Changes in Tropical East Pacific Upper Ocean Stratification: Response to Tropical Gateways?

Steph

Tiedemann²,

Groeneveld³

et al. 2006

Proceedings of the Ocean Drilling Program

101

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A combination of stable isotope records and Mg/Ca temperature estimates of four different planktonic foraminiferal species from Ocean Drilling Program Site 1241 allows differentiation between temperature and salinity changes in the tropical east Pacific (TEP) upper water column during the Pliocene (~5.7-2.1 Ma). The deviation of δ 18 O records and Mg/Ca temperature estimates from thermocline-dwelling planktonic foraminifers suggests that local changes in salinity exerted a much stronger control on Pliocene TEP upper ocean water mass signatures than previously assumed. The most pronounced Pliocene change in TEP upper ocean stratification was the shoaling of the thermocline from ~4.8 to 4.0 Ma that was possibly triggered by changes in the configuration of low-latitude ocean gateways. During this time interval, mixed-layer temperatures and salinities remained relatively constant in contrast to a pronounced temperature (~6°C) and salinity decrease at the bottom of the photic zone. This change led to a new state in the thermal structure of the TEP, as the thermocline remained relatively shallow until ~2.1 Ma.

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“…Contrary, the ACDs of Neogloboquadrina dutertrei scatter within the 40-200 m water depth range (Hemleben et al, 1989;Dekens et al, 2002;Steph et al, 2009;Faul et al, 2000;Nürnberg et al, 2015). Particularly, during strong upwelling the ACD can shoal from within the thermocline to distinctly shallower waters (Loubere, 2001). As the studies are scattered over the world oceans, reliable estimations of the ACDs of planktonic foraminifera in a specific area remains a challenge, which is further hampered by logistical difficulties.…”

mentioning

confidence: 99%

Constraining foraminiferal calcification depths in the western Pacific warm pool

Rippert

Nürnberg

Raddatz

et al. 2016

Marine Micropaleontology

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Insight into past changes of upper ocean stratification, circulation, and nutrient signatures rely on our knowledge of the apparent calcification depth (ACD) and ecology of planktonic foraminifera, which serve as archives for paleoceanographic relevant geochemical signals. The ACD of different species varies strongly between ocean basins, but also regionally. We constrained foraminiferal ACDs in the Western Pacific Warm Pool (Manihiki Plateau) by comparing stable oxygen and carbon isotopes (δ 18 O calite , δ 13 C calcite ) as well as Mg/Ca ratios from living planktonic foraminifera to in-situ physical and chemical water mass properties (temperature, salinity, δ 18 O seawater , δ 13 C DIC ). Our analyses point to Globigerinoides ruber as the shallowest dweller, followed by Globigerinoides sacculifer, Neogloboquadrina dutertrei, Pulleniatina obliquiloculata and Globorotaloides hexagonus inhabiting increasing greater depths. These findings are consistent with other ocean basins; however, absolute ACDs differ from other studies. The uppermost mixed-layer species G. ruber and G. sacculifer denote mean calcification depths of~95 m and~120 m, respectively. These Western Pacific ACDs are much deeper than in most other studies and most likely relate to the thick surface mixed layer and the deep chlorophyll maximum in this region. Our results indicate that N. dutertrei appears to be influenced by mixing waters from the Pacific equatorial divergence, while P. obliquiloculata with an ACD of~160 m is more suitable for thermocline reconstructions. ACDs of G. hexagonus reveal a deep calcification depth of~450 m in oxygen-depleted, but nutrient-rich water masses, consistent to other studies. As the δ 13 C of G. hexagonus is in near-equilibrium with ambient seawater, we suggest this species is suitable for tracing nutrient conditions in equatorial water masses originating in extra-topical regions.

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Nutrient and oceanographic changes in the Eastern Equatorial Pacific from the last full Glacial to the Present

Cited by 42 publications

References 58 publications

Southern Ocean biogeochemical impact on the tropical ocean: Stable isotope records from the Pacific for the past 25,000 years

Southern Ocean biogeochemical impact on the tropical ocean: Stable isotope records from the Pacific for the past 25,000 years

Pliocene Changes in Tropical East Pacific Upper Ocean Stratification: Response to Tropical Gateways?

Constraining foraminiferal calcification depths in the western Pacific warm pool

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