Comparison of δ18O analyses on individual planktic foraminifer (Orbulina universa) shells by SIMS and gas-source mass spectrometry

Wycech, J.; Kelly, D. Clay; Kozdon, Reinhard; Orland, Ian J.; Spero, Howard J.; Valley, John W.

doi:10.1016/j.chemgeo.2018.02.028

Cited by 30 publications

(45 citation statements)

References 75 publications

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“…(c) Highly magnified image (scale bar = 10 μm) of penultimate chamber in cross section showing 10‐μm secondary ion mass spectrometry analysis pits and corresponding δ 18 O values (‰, Vienna Peedee Belemnite). Note: δ 18 O values have been adjusted (+0.9‰) using correction determined by Wycech et al () and gametogenic calcite outlined with yellow dashed line.…”

Section: Methodsmentioning

confidence: 99%

“…The quality of individual analyses on T . sacculifer shells was assessed on the basis of the visual appearance of the pit (Wycech et al, ) and the secondary 16 O − ion yield (ion count rate/primary beam current) relative to the standard (see section S2 for quality control details). Whenever possible, discrete SIMS δ 18 O measurements were performed on the PREGAM (three to four pits per shell) and GAM (one to two pits per shell) calcites of the same shell (Figure c).…”

Section: Methodsmentioning

confidence: 99%

“…sacculifer shells can be avoided by in situ measurements on micrometer‐scale domains in PREGAM calcite using secondary ion mass spectrometry (SIMS). The high precision and spatial resolution (3–10 μm) of this in situ analytical technique permits isolated δ 18 O measurement on a specific calcite phase within an individual foraminifer shell (Kozdon et al, ; Wycech et al, ). Hence, it holds much promise for removing the secondary signals that complicate δ 18 O‐based paleoclimate records generated with conventional GSMS entailing analysis of whole foraminifer shells.…”

Section: Introductionmentioning

confidence: 99%

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Combined Effects of Gametogenic Calcification and Dissolution on δ¹⁸O Measurements of the Planktic Foraminifer Trilobatus sacculifer

Wycech

Kelly

Kitajima

et al. 2018

Geochem Geophys Geosyst

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Oxygen isotope ratios (δ18O) measured from planktic foraminifer shells are commonly used to reconstruct past surface ocean conditions, yet the shells of many planktic foraminifers are an aggregate mixture of multiple carbonate phases with differing δ18O compositions. Here we demonstrate how secondary ion mass spectrometry can be used to measure intrashell δ18O heterogeneity by performing in situ analyses on micrometer‐scale (3–10 μm) domains within individual shells of the extant, mixed layer species Trilobatus sacculifer. Secondary ion mass spectrometry measurements on shells taken from Holocene‐aged sediments at three sites in different ocean basins confirm that the δ18O of gametogenic (GAM) calcite added to shells during the terminal (reproductive) stage of the life cycle is 1.0–1.4‰ higher than that of pregametogenic calcite. Examination of shells in cross section reveals that many have suffered varying degrees of internal dissolution, which further skews whole‐shell δ18O compositions toward higher values by preferentially removing low δ18O pregametogenic calcite. The results of this study echo the calls of earlier studies cautioning that spatiotemporal changes in the proportion of high δ18O GAM calcite should be considered when assessing T. sacculifer δ18O records generated via conventional isotope ratio mass spectrometry.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Combined Effects of Gametogenic Calcification and Dissolution on δ¹⁸O Measurements of the Planktic Foraminifer Trilobatus sacculifer

Wycech

Kelly

Kitajima

et al. 2018

Geochem Geophys Geosyst

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“…Interestingly, the weakest correlation is observed between the stable isotope data of G. truncatulinoides and both MFI‐based percent dissolved and ΔCO 3 2− (Table ). This is noteworthy because this species is purported to have heterogeneous test geochemistry with regard to stable isotopes and the parts of the shell with greater concentrations of 16 O are expected to dissolve (Lohmann, ), similar to a mixed layer foraminifer, Globigerinoides sacculifer (Wycech et al, ), rendering δ 18 O values larger as ΔCO 3 2− decreases.…”

Section: Resultsmentioning

confidence: 99%

“…In fact, no dissolution effect on δ 18 O and δ 13 C data from N. dutertrei tests was observed in core tops from the eastern equatorial Pacific (Mekik, ). If dissolution in sediments removes 16 O due to shell heterogeneity, then we would expect the δ 18 O values to increase in the positive direction as percent calcite dissolved increases (Wycech et al, ).…”

Section: Introductionmentioning

confidence: 99%

Field Testing the Fidelity of δ¹⁸O and δ¹³C in Reconstructing Upper Ocean Hydrography

Mekik

Winkelstern

2020

Paleoceanog and Paleoclimatol

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Stable isotope data from tests of four planktonic foraminifer species in core tops on the Rio Grande Rise (RIO) fail a field test of reproducibility until corrections are made for various environmental effects. The regionally uniform and strongly stratified surface ocean hydrography across RIO allows the identification of causes of variability in δ18O and δ13C data in addition to the effects of surface ocean temperature and nutrient content. A previously calibrated calcite dissolution proxy indicates that the dissolution of foraminifer shells in sediments has no effect on δ18O and δ13C in tests of foraminifers from core tops on RIO. Furthermore, vital effects within and among foraminifer species are not sufficient to explain the large variability of δ18O and δ13C data observed on RIO. Instead, correctly estimating species‐specific habitat depth ranges and adjusting δ13C values for ocean/atmosphere carbon exchange are necessary to accurately reconstruct the hydrography of surface waters on RIO.

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Calibrating temperature reconstructions from fish otolith oxygen isotope analysis for California's critically endangered Delta Smelt

Willmes

Lewis

Davis

et al. 2019

Rapid Comm Mass Spectrometry

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Rationale: Oxygen isotope ratios (δ 18 O values) of fish otoliths (ear bones) are valuable geochemical tracers of water conditions and thermal life history. Delta Smelt (Hypomesus transpacificus) are osmerid forage fish endemic to the San Francisco Estuary, California, USA, that are on the verge of extinction. These fish exhibit a complex life history that allows them to survive in a dynamic estuarine environment; however, a rapidly warming climate threatens this thermally sensitive species. Here we quantify the accuracy and precision of using δ 18 O values in otoliths to reconstruct the thermal life histories of Delta Smelt. Methods: Delta Smelt were reared for 360 days using three different water sources with different ambient δ 18 O water values (−8.75‰, −5.28‰, and −4.06‰) and different water temperatures (16.4°C, 16.7°C, 18.7°C, and 20.5°C). Samples were collected after 170 days (n = 28) and 360 days (n = 14) post-hatch. In situ δ 18 O values were measured from the core of the otolith to the dorsal edge using secondary ion mass spectrometry (SIMS) to reconstruct temporally resolved thermal life histories. Results: The δ 18 O otolith values for Delta Smelt varied as a linear inverse function of water temperature: 1000 ln α = 18.39 (±0.43, 1SE)(10 3 TK −1 ) − 34.56 (±1.49, 1SE) and δ 18 O otolith(VPDB) − δ 18 O water (VPDB) = 31.34(±0.09, 1SE) − 0.19(±0.01, 1SE) × T°C. When the ambient δ 18 O water value is known, this species-specific temperature-dependent oxygen isotope fractionation model facilitated the accurate (0.25°C) and precise (±0.37°C, 2σ) reconstruction of the water temperature experienced by the fish. In contrast, the use of existing general fractionation equations resulted in inaccurate temperature reconstructions. Conclusions: The species-specific δ 18 O otolith fractionation equation allowed for accurate and precise reconstructions of water temperatures experienced by Delta Smelt. Characterization of ambient δ 18 O water values remains a critical next step for reconstructing thermal life histories of wild Delta Smelt. This tool will provide new insights into habitat utilization, potential thermal refugia, and resilience to future warming for this critically endangered fish.

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Comparison of δ18O analyses on individual planktic foraminifer (Orbulina universa) shells by SIMS and gas-source mass spectrometry

Cited by 30 publications

References 75 publications

Combined Effects of Gametogenic Calcification and Dissolution on δ¹⁸O Measurements of the Planktic Foraminifer Trilobatus sacculifer

Combined Effects of Gametogenic Calcification and Dissolution on δ¹⁸O Measurements of the Planktic Foraminifer Trilobatus sacculifer

Field Testing the Fidelity of δ¹⁸O and δ¹³C in Reconstructing Upper Ocean Hydrography

Calibrating temperature reconstructions from fish otolith oxygen isotope analysis for California's critically endangered Delta Smelt

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Comparison of δ18O analyses on individual planktic foraminifer (Orbulina universa) shells by SIMS and gas-source mass spectrometry

Cited by 30 publications

References 75 publications

Combined Effects of Gametogenic Calcification and Dissolution on δ18O Measurements of the Planktic Foraminifer Trilobatus sacculifer

Combined Effects of Gametogenic Calcification and Dissolution on δ18O Measurements of the Planktic Foraminifer Trilobatus sacculifer

Field Testing the Fidelity of δ18O and δ13C in Reconstructing Upper Ocean Hydrography

Calibrating temperature reconstructions from fish otolith oxygen isotope analysis for California's critically endangered Delta Smelt

Contact Info

Product

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Combined Effects of Gametogenic Calcification and Dissolution on δ¹⁸O Measurements of the Planktic Foraminifer Trilobatus sacculifer

Combined Effects of Gametogenic Calcification and Dissolution on δ¹⁸O Measurements of the Planktic Foraminifer Trilobatus sacculifer

Field Testing the Fidelity of δ¹⁸O and δ¹³C in Reconstructing Upper Ocean Hydrography