scholarly journals Ground-truthing the boron isotope-paleo-pH proxy in planktonic foraminifera shells: Partial dissolution and shell size effects

2004 ◽  
Vol 19 (4) ◽  
pp. n/a-n/a ◽  
Author(s):  
Bärbel Hönisch ◽  
N. Gary Hemming
Keyword(s):  
Size Effects ◽  
Planktonic Foraminifera ◽  
Boron Isotope ◽  
Shell Size ◽  
Partial Dissolution ◽  
Ground Truthing

Boron isotope-based seasonal paleo-pH reconstruction for the Southeast Atlantic – A multispecies approach using habitat preference of planktonic foraminifera

2018 ◽  
Vol 487 ◽  
pp. 138-150 ◽  
Author(s):  
Markus Raitzsch ◽  
Jelle Bijma ◽  
Albert Benthien ◽  
Klaus-Uwe Richter ◽  
Grit Steinhoefel ◽  
...  
Keyword(s):  
Habitat Preference ◽  
Planktonic Foraminifera ◽  
Boron Isotope ◽  
Ph Reconstruction

scholarly journals Late Pleistocene glacial–interglacial shell-size–isotope variability in planktonic foraminifera as a function of local hydrography

2015 ◽  
Vol 12 (15) ◽  
pp. 4781-4807 ◽  
Author(s):  
B. Metcalfe ◽  
W. Feldmeijer ◽  
M. de Vringer-Picon ◽  
G.-J. A. Brummer ◽  
F. J. C. Peeters ◽  
...  
Keyword(s):  
Size Range ◽  
North Atlantic Ocean ◽  
Life Stage ◽  
Planktonic Foraminifera ◽  
Isotope Analysis ◽  
Past Research ◽  
Individual Species ◽  
Shell Size ◽  
Size Fractions ◽  
Water Column Stratification

Abstract. So-called "vital effects" are a collective term for a suite of physiologically and metabolically induced variability in oxygen (δ18O) and carbon (δ13C) isotope ratios of planktonic foraminifer shells that hamper precise quantitative reconstruction of past ocean parameters. Correction for potential isotopic offsets from equilibrium or the expected value is paramount, as too is the ability to define a comparable life stage for each species that allows for direct comparison. Past research has focused upon finding a specific size range for individual species in lieu of other identifiable features, thus allowing ocean parameters from a particular constant (i.e. a specific depth or season) to be reconstructed. Single-shell isotope analysis of fossil shells from a mid-latitude North Atlantic Ocean piston core covering Termination III (200 to 250 ka) highlight the advantage of using a dynamic size range, i.e. utilising measurements from multiple narrow sieve size fractions spanning a large range of total body sizes, in studies of palaeoclimate. Using this methodology, we show that isotopic offsets between specimens in successive size fractions of Globorotalia inflata and Globorotalia truncatulinoides are not constant over time, contrary to previous findings. For δ18O in smaller-sized globorotalids (212–250 μm) it is suggested that the offset from other size fractions may reflect a shallower habitat in an early ontogenetic stage. A reduction in the difference between small and large specimens of G. inflata between insolation minima and maxima is interpreted to relate to a prolonged period of reduced water column stratification. For the shallow-dwelling species Globigerina bulloides, no size–isotope difference between size fractions is observed, and the variability in the oxygen isotopic values is shown to correlate well with the seasonal insolation patterns. As such, patterns in oxygen isotope variability of fossil populations may be used to reconstruct past seasonality changes.

scholarly journals Ligand shell size effects on one- and two-photon excitation fluorescence of zwitterion functionalized gold nanoclusters

2019 ◽  
Vol 21 (43) ◽  
pp. 23916-23921 ◽  
Author(s):  
Martina Perić ◽  
Željka Sanader Maršić ◽  
Isabelle Russier-Antoine ◽  
Hussein Fakhouri ◽  
Franck Bertorelle ◽  
...  
Keyword(s):  
Optical Properties ◽  
Size Effects ◽  
Gold Nanoclusters ◽  
Shell Size ◽  
Two Photon ◽  
Photon Excitation ◽  
Ligand Shell ◽  
Aqueous Solvent ◽  
The One ◽  
Two Photon Excitation

The effects of explicit ligands and of aqueous solvent on optical properties and in particular on the one- and two-photon excitation fluorescence of zwitterion functionalized gold nanoclusters have been studied.

scholarly journals Late Pleistocene Glacial–Interglacial related shell size isotope variability in planktonic foraminifera as a function of local hydrology

2015 ◽  
Vol 12 (1) ◽  
pp. 135-189 ◽  
Author(s):  
B. Metcalfe ◽  
W. Feldmeijer ◽  
M. de Vringer-Picon ◽  
G.-J. A. Brummer ◽  
F. J. C. Peeters ◽  
...  
Keyword(s):  
Size Range ◽  
North Atlantic Ocean ◽  
Life Stage ◽  
Planktonic Foraminifera ◽  
Isotope Analysis ◽  
Past Research ◽  
Individual Species ◽  
Shell Size ◽  
Size Fractions ◽  
Water Column Stratification

Abstract. So called "vital effects", a collective noun for a suite of physiological and metabolic induced variability, in oxygen (δ18O) and carbon (δ13C) isotope ratios of planktonic foraminifer shells hamper precise quantitative reconstruction of past ocean parameters. Correction for potential isotopic offsets from the equilibrium or the expected value is paramount, as too is the ability to define a comparable life-stage for each species that allows for direct comparison. Past research has focused upon finding a specific size range for individual species in lieu of other identifiable features, that allow ocean parameters from a particular constant (i.e. a specific depth or season) to be reconstructed. Single shell isotope analysis of fossil shells from a mid-latitude North Atlantic Ocean piston-core covering Termination III (200 to 250 kyr) highlight the advantage of using a dynamic size range in studies of palaeoclimate. Using this methodology, we show that isotopic offsets between specimens in successive size fractions of G. inflata and G. truncatulinoides are not constant over time, contrary to previous findings. For δ18O in smaller sized globorotalids it is suggested that the offset from other size fractions may reflect a shallower habitat in an early ontogenetic stage. A reduction in the difference between small and large specimens of G. inflata between insolation minima and maxima is interpreted to relate to a prolonged period of reduced water column stratification. For the shallow dwelling species G. bulloides no size isotope difference between size fractions is observed, and the variability in the oxygen isotopic values are shown to correlate well with the seasonal insolation patterns. As such, patterns in oxygen isotope variability of fossil populations may be used successfully for reconstruction of past seasonality changes.

δ11B and B/Ca ontogenetic variability within Globigerina bulloides

2020 ◽  
Author(s):  
Matthieu Buisson ◽  
Pascale Louvat ◽  
Szabina Karancz ◽  
Ruchen Tian ◽  
Markus Raitzsch ◽  
...  
Keyword(s):  
Size Effect ◽  
Earth Science ◽  
Isotopic Ratio ◽  
Direct Injection ◽  
Planktonic Foraminifera ◽  
Small Samples ◽  
Shell Size ◽  
Seawater Chemistry ◽  
Globigerina Bulloides ◽  
Ocean Carbon

<p>Understanding the atmosphere-continent-ocean carbon cycle and its associated oceanic carbon system is one of the keystones to face the Anthropocene’s climate change. Since the 1990s the isotopic ratio of boron (δ<sup>11</sup>B) in calcitic shells of planktonic foraminifera has proven to be a powerful geochemical proxy to determine the oceanic paleo-pH and its link to atmospheric CO<sub>2</sub> level over geological times<sup>1</sup>, whereas the ratio B/Ca as proxy of the seawater carbonate chemistry is still questionable<sup>2,3</sup>.</p><p>However, the use of planktonic foraminifera in paleoclimatic reconstructions requires calibrations of the pH – δ<sup>11</sup>B relationships to correct what is known as « vital effect »<sup>4</sup>: each species controls differently its calcification process and consequently slightly modifies the seawater chemistry during biomineralization<sup>5,6</sup>. Moreover, shell size effect on δ<sup>11</sup>B has been reported for some symbiont-bearing species due to photosynthetic increase of pH<sup>7,8</sup>.</p><p>Calibrations for the symbiont-barren <em>Globigerina bulloides</em> have been already determined<sup>9,10 </sup>but sparse data have been reported so far for the test size effect on δ<sup>11</sup>B <sup>11</sup>.</p><p>Here we measured the δ<sup>11</sup>B of three different fractions (250-315, 315-400 and >400 μm) of <em>G. bulloides</em> sampled along the coretop PS97-122 from the Chilean margin (54.10°S, 74.91°W), by using a new protocol developed at IPGP and dedicated to small samples which couple a microsublimation technique and a micro-direct injection device (μ-dDIHEN<sup>12</sup>). Our preliminary results show significantly higher δ<sup>11</sup>B values for the large fractions compared to the small ones, as found for symbiont-bearing planktonic species such as <em>Globigerinoides sacculifer</em><sup>7</sup> and <em>Globigerinoides ruber</em><sup>8</sup>.</p><p> </p><ul><li>(1) Pearson & Palmer, 2000, <em>Nature</em> 406, 695-699</li> <li>(2) Yu et al., 2007, <em>Paleoceanography</em> 22, PA2202</li> <li>(3) Allen et al., 2012, <em>EPSL</em> 351-352, 270-280</li> <li>(4) Urey et al., 1951,<em> Soc. Am. Bull.</em> 62, 399-416</li> <li>(5) Erez, 2003, <em>Rev. in Min. and Geochem.</em> 54 (1), 115-149</li> <li>(6) de Nooijer et al., 2014, <em>Earth-Science Reviews</em> 135, 48-58</li> <li>(7) Hönisch & Hemming, 2004, <em>Paleoceanography</em> 19, PA4010</li> <li>(8) Henehan et al., 2013, <em>EPSL</em> 364, 111-122</li> <li>(9) Martínez-Botíet al., 2015, <em>Nature</em> 518, 219-222</li> <li>(10) Raitzsch et al., 2018, <em>EPSL</em> 487, 138-150</li> <li>(11) Henehan et al., 2016, <em>EPSL</em> 454, 282-292</li> <li>(12) Louvat et al., 2019, <em>JAAS</em> 8, 1553-1563</li> </ul>

scholarly journals Calibration of the boron isotope proxy in the planktonic foraminifera Globigerinoides ruber for use in palaeo-CO2 reconstruction

2013 ◽  
Vol 364 ◽  
pp. 111-122 ◽  
Author(s):  
Michael J. Henehan ◽  
James W.B. Rae ◽  
Gavin L. Foster ◽  
Jonathan Erez ◽  
Katherine C. Prentice ◽  
...  
Keyword(s):  
Planktonic Foraminifera ◽  
Boron Isotope ◽  
Globigerinoides Ruber

scholarly journals Shell density of planktonic foraminifera and pteropod species Limacina helicina in the Barents Sea: Relation to ontogeny and water chemistry

PLoS ONE ◽  
2021 ◽  
Vol 16 (4) ◽  
pp. e0249178
Author(s):  
Siri Ofstad ◽  
Katarzyna Zamelczyk ◽  
Katsunori Kimoto ◽  
Melissa Chierici ◽  
Agneta Fransson ◽  
...  
Keyword(s):  
Water Depth ◽  
Barents Sea ◽  
Planktonic Foraminifera ◽  
Chemical Properties ◽  
Specific Area ◽  
Shell Size ◽  
Neogloboquadrina Pachyderma ◽  
The Barents Sea ◽  
Limacina Helicina ◽  
Physical And Chemical

Planktonic calcifiers, the foraminiferal species Neogloboquadrina pachyderma and Turborotalita quinqueloba, and the thecosome pteropod Limacina helicina from plankton tows and surface sediments from the northern Barents Sea were studied to assess how shell density varies with depth habitat and ontogenetic processes. The shells were measured using X-ray microcomputed tomography (XMCT) scanning and compared to the physical and chemical properties of the water column including the carbonate chemistry and calcium carbonate saturation of calcite and aragonite. Both living L. helicina and N. pachyderma increased in shell density from the surface to 300 m water depth. Turborotalita quinqueloba increased in shell density to 150–200 m water depth. Deeper than 150 m, T. quinqueloba experienced a loss of density due to internal dissolution, possibly related to gametogenesis. The shell density of recently settled (dead) specimens of planktonic foraminifera from surface sediment samples was compared to the living fauna and showed a large range of dissolution states. This dissolution was not apparent from shell-surface texture, especially for N. pachyderma, which tended to be both thicker and denser than T. quinqueloba. Dissolution lowered the shell density while the thickness of the shell remained intact. Limacina helicina also increase in shell size with water depth and thicken the shell apex with growth. This study demonstrates that the living fauna in this specific area from the Barents Sea did not suffer from dissolution effects. Dissolution occurred after death and after settling on the sea floor. The study also shows that biomonitoring is important for the understanding of the natural variability in shell density of calcifying zooplankton.

scholarly journals Boron Contamination during Boron Isotope Analysis of Planktonic Foraminifera

2020 ◽  
Author(s):  
Kaoru Kubota ◽  
Tsuyoshi Ishikawa ◽  
Kazuya Nagaishi ◽  
Tatsuya Kawai ◽  
Takuya Sagawa ◽  
...  
Keyword(s):  
Planktonic Foraminifera ◽  
Isotope Analysis ◽  
Boron Isotope

scholarly journals Seawater pH reconstruction using boron isotopes in multiple planktonic foraminifera species with different depth habitats and their potential to constrain pH and pCO<sub>2</sub> gradients

2019 ◽  
Author(s):  
Maxence Guillermic ◽  
Sambuddha Misra ◽  
Robert Eagle ◽  
Alexandra Villa ◽  
Fengming Chang ◽  
...  
Keyword(s):  
Sediment Core ◽  
Planktonic Foraminifera ◽  
Boron Isotope ◽  
Small Samples ◽  
Light Limitation ◽  
Ph Gradients ◽  
Past Behavior ◽  
Seawater Ph ◽  
Neogloboquadrina Dutertrei ◽  
Carbon Pump

Abstract. Boron isotope systematics of planktonic foraminifera from core-top sediments and culture experiments have been studied to investigate the sensitivity of δ11B of their calcite tests to seawater pH. However, our knowledge of the relationship between δ11B and pH remains incomplete for several taxa. Thus, to expand the potential scope of application of this proxy, we report data for 7 different species of planktonic foraminifera from sediment core-tops. We utilize a method for the measurement of small samples of foraminifera and calculate the δ11B-calcite sensitivity to pH for Globigerinoides ruber, Trilobus sacculifer (sacc or w/o sacc), Orbulina universa, Pulleniatina obliquiloculata, Neogloboquadrina dutertrei, Globorotalia menardii and Globorotalia tumida, including for unstudied coretops and species. The sensitivity of δ11Bcarbonate to δ11Bborate (eg. Δδ11Bcarbonate/Δδ11Bborate) in core-tops is close to unity. Deep-dwelling species closely follow the core-top calibration for O. universa, which is attributed to respiration-driven microenvironments, likely caused by light limitation for symbiont-bearing foraminifera. These taxa have diverse ecological preferences and are from sites that span a range of oceanographic regimes, including some that are in regions of air-sea equilibrium and others that are out of equilibrium with the atmosphere. Our data support the premise that utilizing boron isotope measurements of multiple species within a sediment core can be utilized to constrain vertical profiles of pH and pCO2 at sites spanning different oceanic regimes, thereby constraining changes in vertical pH gradients and yielding insights into the past behavior of the oceanic carbon pump.

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