Reevaluation of the oxygen isotopic composition of planktonic foraminifera: Experimental results and revised paleotemperature equations

Bemis, Bryan E.; Spero, Howard J.; Biȷma, Jelle; Lea, David W.

doi:10.1029/98pa00070

Cited by 985 publications

(959 citation statements)

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“…per practical salinity unit (psu), considerably lower than found in some previous studies (e.g., Arbuszewski et al, 2010 Lea et al (2000) using the temperature and δ 18 O relation derived for Orbulina universa (Bemis et al, 1998) of T=14.9-4.8(δ 18 Oc -δ 18 Osw), which was shown to be applicable to G.…”

Section: Methodsmentioning

confidence: 53%

See 1 more Smart Citation

The role of North Brazil Current transport in the paleoclimate of the Brazilian Nordeste margin and paleoceanography of the western tropical Atlantic during the late Quaternary

Nace

Baker

Dwyer

et al. 2014

Palaeogeography, Palaeoclimatology, Palaeoecology

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Section: Methodsmentioning

confidence: 53%

“…The δ 18 Osw is reported in per mil relative to the Vienna standard mean ocean water (VSMOW) by subtracting 0.27‰ from the calculated δ 18 Osw (Bemis et al, 1998).…”

Section: Methodsmentioning

confidence: 99%

The role of North Brazil Current transport in the paleoclimate of the Brazilian Nordeste margin and paleoceanography of the western tropical Atlantic during the late Quaternary

Nace

Baker

Dwyer

et al. 2014

Palaeogeography, Palaeoclimatology, Palaeoecology

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“…In order to calculate seawater  18 O ( 18 O SW ) as a measure of hydrologic changes, we used the  18 O:temperature equation of Bemis et al 60 :…”

Section: Age Modelsmentioning

confidence: 99%

North Atlantic forcing of tropical Indian Ocean climate

Mohtadi

Prange

Oppo

et al. 2014

Nature

252

228

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The response of the tropical climate in the Indian Ocean realm to abrupt climate change events in the North Atlantic Ocean is contentious. Repositioning of the intertropical convergence zone is thought to have been responsible for changes in tropical hydroclimate during North Atlantic cold spells 1-5 , but the dearth of high-resolution records outside the monsoon realm in the Indian Ocean precludes a full understanding of this remote relationship and its underlying mechanisms. Here we show that slowdowns of the Atlantic meridional overturning circulation during Heinrich stadials and the Younger Dryas stadial affected the tropical Indian Ocean hydroclimate through changes to the Hadley circulation including a southward shift in the rising branch (the intertropical convergence zone) and an overall weakening over the southern Indian Ocean. Our results are based on new, high-resolution sea surface temperature and seawater oxygen isotope records of well dated sedimentary archives from the tropical eastern Indian Ocean for the past 45,000 years, combined with climate model simulations of Atlantic circulation slowdown under Marine Isotope Stages 2 and 3 boundary conditions. Similar conditions in the east and west of the basin rule out a zonal dipole structure as the dominant forcing of the tropical Indian Ocean hydroclimate of millennial-scale events. Results from our simulations and proxy data suggest dry conditions in the northern Indian Ocean realm and wet and warm conditions in the southern realm during North Atlantic cold spells.In the North Atlantic, the most recent glacial and deglacial periods are characterized by a series of abrupt and severe cold snaps of millennial duration associated with either iceberg instabilities and surges (Heinrich events) or freshwater input from the Arctic Ocean 6 (the Younger Dryas). These abrupt events are of particular interest because they were rapidly communicated through the ocean by a slowdown, or potentially a shutdown, of the Atlantic meridional overturning circulation 7 (AMOC) and through the atmospheric circulation 8 causing climate anomalies worldwide. Climate archives document a significant tropical hydrologic response to these events. Dry Younger Dryas and Heinrich stadials have been reported from various marine and terrestrial archives across the tropical Indian Ocean 4,9-14 .However, a few records suggest wet Younger Dryas or Heinrich stadials over northeast Australia 15 , southern Indonesia 5,16 and southeast Africa 12,17 . Although there seems to be strong evidence that the intertropical convergence zone (ITCZ) moved southwards in the tropical Atlantic 2 , a wide range of mechanisms have been offered to explain the connection between the cooling of the North Atlantic and tropical Indian Ocean hydroclimates: a weakening of the rainfall system in response to regional sea surface cooling 13,14 ; and changes in the monsoon intensity 4,10,16 associated with a southward shift in the mean 1 or winter 4,5,15 position of the ITCZ or in the position of oceanic fronts 18 .How...

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“…While vital effects have been widely documented in biogenic carbonates such as foraminifera and ostracods (Duplessy et al, 1970;Wefer and Berger, 1991;Lea, 1993, 1996;Spero et al, 1997;Xia et al, 1997;Bemis et al, 1998;von Grafenstein et al, 1999;Chivas et al, 2002;Holmes and Chivas, 2002), almost all culture (Binz, 1987;Brandriss et al, 1998;Schmidt et al, 2001), down-core (Juillet-Leclerc and Labeyrie, 1987;Shemesh et al, 1995) and water column studies have found no clear evidence of a vital effect in δ 18 Odiatom. Recent work, however, has shown the potential for δ 18 Odiatom vital effects to exist with offsets of up to 3.51‰ (mean offset = 1.23‰, n = 25) observed between two size fractions of diatoms at Ocean Drilling …”

Section: Uncorrected Copymentioning

confidence: 99%

Isotope offsets in marine diatom δ¹⁸O over the last 200 ka

Swann

Leng

Sloane

et al. 2008

J Quaternary Science

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Previous work has suggested that a species effect may be present in diatom oxygen isotope ratios ( δ 18 Odiatom).While predominantly attributed to be a size related species effect, currently the precise mechanism remains unknown. Here, two size fractions of diatoms (38-75 μm and >100 μm) covering the last 200 ka are analysed for δ 18 O from ODP Site 882 in the North West Pacific Ocean. Synchronous variations of up to 13‰ occur in both size fractions. However, large isotope offsets (mean = 2.02‰) exist between the two fractions with no relationship between their magnitude and the overlying palaeoenvironmental conditions. In contrast to earlier work from the same site, no one size fraction is constantly higher or lower in δ 18 O relative to the other. As such, the dominant mechanism is most likely separate to the size effect previously detected. In addition, no relationship exists between the magnitude of the offsets and the species composition of the two size fractions. The presence of these isotope offsets imposes significant constraints upon the future use of δ 18 Odiatom in palaeoceanographic reconstructions and reiterates the need to extract and analyse only species and size specific diatom samples.

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Reevaluation of the oxygen isotopic composition of planktonic foraminifera: Experimental results and revised paleotemperature equations

Abstract: Abstract. Cultured planktonic foraminifera, Orbulina universa (symbiotic) and Globigerina bulloides (nonsymbiotic), are used to reexamine temperature:fi180 relationships at 15ø-25øC. Relationships for both species can be described by

Cited by 985 publications

References 45 publications

The role of North Brazil Current transport in the paleoclimate of the Brazilian Nordeste margin and paleoceanography of the western tropical Atlantic during the late Quaternary

The role of North Brazil Current transport in the paleoclimate of the Brazilian Nordeste margin and paleoceanography of the western tropical Atlantic during the late Quaternary

North Atlantic forcing of tropical Indian Ocean climate

Isotope offsets in marine diatom δ¹⁸O over the last 200 ka

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Reevaluation of the oxygen isotopic composition of planktonic foraminifera: Experimental results and revised paleotemperature equations

Abstract: Abstract. Cultured planktonic foraminifera, Orbulina universa (symbiotic) and Globigerina bulloides (nonsymbiotic), are used to reexamine temperature:fi180 relationships at 15ø-25øC. Relationships for both species can be described by

Cited by 985 publications

References 45 publications

The role of North Brazil Current transport in the paleoclimate of the Brazilian Nordeste margin and paleoceanography of the western tropical Atlantic during the late Quaternary

The role of North Brazil Current transport in the paleoclimate of the Brazilian Nordeste margin and paleoceanography of the western tropical Atlantic during the late Quaternary

North Atlantic forcing of tropical Indian Ocean climate

Isotope offsets in marine diatom δ18O over the last 200 ka

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Product

Resources

About

Isotope offsets in marine diatom δ¹⁸O over the last 200 ka