Consulta: creatorFacets:"Lisiecki, Lorraine E."
Registros recuperados: 5
Data/hora: 27/07/2024 03:07:37

Termination 1 timing in radiocarbon-dated regional benthic delta O-18 stacks
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Stern, Joseph V.; Lisiecki, Lorraine E.
Benthic O-18 changes are often assumed to be globally synchronous, but studies comparing 2-9 radiocarbon-dated records over the most recent deglaciation (Termination 1) have proposed differences in the timing of benthic O-18 change between the Atlantic and Pacific, intermediate and deep, and North and South Atlantic. Because of the relatively small number of records used in these previous studies, it has remained unclear whether these differences are local or regional in scale. Here we present seven regional benthic O-18 stacks for 0-40 kyr B.P. that include 252 records with independent regional age models constrained by 852 planktonic foraminiferal C-14 dates from 61 of these cores. We find a 4000 year difference between the earliest termination onset in...
Tipo: Text
Palavras-chave: Termination 1; Regional stacks; Benthic delta O-18; Radiocarbon.
Ano: 2014
URL: https://archimer.ifremer.fr/doc/00289/40039/38763.pdf

Deglacial whole-ocean delta C-13 change estimated from 480 benthic foraminiferal records
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Peterson, Carlye D.; Lisiecki, Lorraine E.; Stern, Joseph V.
Terrestrial carbon storage is dramatically decreased during glacial periods due to cold temperatures, increased aridity, and the presence of large ice sheets on land. Most of the carbon released by the terrestrial biosphere is stored in the ocean, where the light isotopic signature of terrestrial carbon is observed as a 0.32-0.7 parts per thousand depletion in benthic foraminiferal delta C-13. The wide range in estimated delta C-13 change results from the use of different subsets of benthic delta C-13 data and different methods of weighting the mean delta C-13 by volume. We present a more precise estimate of glacial-interglacial delta C-13 change of marine dissolved inorganic carbon using benthic Cibicidoides spp. delta C-13 records from 480 core sites...
Tipo: Text
Ano: 2014
URL: https://archimer.ifremer.fr/doc/00290/40131/39115.pdf

Calibration of the carbon isotope composition (C-13) of benthic foraminifera
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Schmittner, Andreas; Bostock, Helen C.; Cartapanis, Olivier; Curry, William B.; Filipsson, Helena L.; Galbraith, Eric D.; Gottschalk, Julia; Carlos Herguera, Juan; Hoogakker, Babette; Jaccard, Samuel L.; Lisiecki, Lorraine E.; Lund, David C.; Martinez-mendez, Gema; Lynch-stieglitz, Jean; Mackensen, Andreas; Michel, Elisabeth; Mix, Alan C.; Oppo, Delia W.; Peterson, Carlye D.; Repschlaeger, Janne; Sikes, Elisabeth L.; Spero, Howard J.; Waelbroeck, Claire.
The carbon isotope composition (C-13) of seawater provides valuable insight on ocean circulation, air-sea exchange, the biological pump, and the global carbon cycle and is reflected by the C-13 of foraminifera tests. Here more than 1700 C-13 observations of the benthic foraminifera genus Cibicides from late Holocene sediments (C-13(Cibnat)) are compiled and compared with newly updated estimates of the natural (preindustrial) water column C-13 of dissolved inorganic carbon (C-13(DICnat)) as part of the international Ocean Circulation and Carbon Cycling (OC3) project. Using selection criteria based on the spatial distance between samples, we find high correlation between C-13(Cibnat) and C-13(DICnat), confirming earlier work. Regression analyses indicate...
Tipo: Text
Palavras-chave: Carbon; Isotopes; Benthic; Foraminifera; Calibration.
Ano: 2017
URL: https://archimer.ifremer.fr/doc/00661/77326/78788.pdf

Deglacial carbon cycle changes observed in a compilation of 127 benthic δ13C time series (20–6 ka)
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Peterson, Carlye D.; Lisiecki, Lorraine E.
We present a compilation of 127 time series δ13C records from Cibicides wuellerstorfi spanning the last deglaciation (20–6 ka) which is well-suited for reconstructing large-scale carbon cycle changes, especially for comparison with isotope-enabled carbon cycle models. The age models for the δ13C records are derived from regional planktic radiocarbon compilations (Stern and Lisiecki, 2014). The δ13C records were stacked in nine different regions and then combined using volume-weighted averages to create intermediate, deep, and global δ13C stacks. These benthic δ13C stacks are used to reconstruct changes in the size of the terrestrial biosphere and deep ocean carbon storage. The timing of change in global mean δ13C is interpreted to indicate terrestrial...
Tipo: Text
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00491/60238/63632.pdf

Lower oceanic δ13C during the last interglacial period compared to the Holocene
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Bengtson, Shannon A.; Menviel, Laurie C.; Meissner, Katrin J.; Missiaen, Lise; Peterson, Carlye D.; Lisiecki, Lorraine E.; Joos, Fortunat.
The last time in Earth's history when high latitudes were warmer than during pre-industrial times was the last interglacial period (LIG, 129–116 ka BP). Since the LIG is the most recent and best documented interglacial, it can provide insights into climate processes in a warmer world. However, some key features of the LIG are not well constrained, notably the oceanic circulation and the global carbon cycle. Here, we use a new database of LIG benthic δ13C to investigate these two aspects. We find that the oceanic mean δ13C was  ∼  0.2 ‰ lower during the LIG (here defined as 125–120 ka BP) when compared to the Holocene (7–2 ka BP). A lower terrestrial carbon content at the LIG than during the Holocene could have led to both lower oceanic δ13C and atmospheric...
Tipo: Text
Ano: 2021
URL: https://archimer.ifremer.fr/doc/00682/79397/81928.pdf