Alkenone and boron based Oligocene pCO2 records

Autoria(s): Seki, Osamu; Foster, Gavin L; Schmidt, Daniela N; Mackensen, Andreas; Kawamura, Kimitaka; Pancost, Richard D
Cobertura

MEDIAN LATITUDE: 8.935197 * MEDIAN LONGITUDE: -68.291053 * SOUTH-BOUND LATITUDE: 3.719100 * WEST-BOUND LONGITUDE: -86.444500 * NORTH-BOUND LATITUDE: 12.744000 * EAST-BOUND LONGITUDE: -42.908100 * DATE/TIME START: 1994-02-13T16:45:00 * DATE/TIME END: 2002-05-22T19:20:00
Data(s)

20/01/2010
Resumo

The Pliocene period is the most recent time when the Earth was globally significantly (~3°C) warmer than today. However, the existing pCO2 data for the Pliocene are sparse and there is little agreement between the various techniques used to reconstruct palaeo-pCO2. Moreover, the temporal resolution of the published records does not allow a robust assessment of the role of declining pCO2 in the intensification of the Northern Hemisphere Glaciation (INHG) and a direct comparison to other proxy records are lacking. For the first time, we use a combination of foraminiferal (delta11B) and organic biomarker (alkenone-derived carbon isotopes) proxies to determine the concentration of atmospheric CO2 over the past 5 Ma. Both proxy records show that during the warm Pliocene pCO2 was between 330 and 400 ppm, i.e. similar to today. The decrease to values similar to pre-industrial times (275-285 ppm) occurred between 3.2 Ma and 2.8 Ma - coincident with the INHG and affirming the link between global climate, the cryosphere and pCO2.
Formato

application/zip, 6 datasets
Identificador

https://doi.pangaea.de/10.1594/PANGAEA.732923

doi:10.1594/PANGAEA.732923
Idioma(s)

en
Publicador

PANGAEA
Direitos

CC-BY: Creative Commons Attribution 3.0 Unported

Access constraints: unrestricted
Fonte

Supplement to: Seki, Osamu; Foster, Gavin L; Schmidt, Daniela N; Mackensen, Andreas; Kawamura, Kimitaka; Pancost, Richard D (2010): Alkenone and boron based Pliocene pCO2 records. Earth and Planetary Science Letters, 292(1-2), 201-211, doi:10.1016/j.epsl.2010.01.037
Palavras-Chave #[CO3]2-; [CO3]2- std dev; #1; #1, 2 s.e.; #1, 2 se; #1, due to small sample size some data points have been blank corrected based on their boron concentration and the boron concentration and d11B of the total procedural blank; #1, uncorrected; #2; #2, 2 s.e.; #2, due to small sample size some data points have been blank corrected based on their boron concentration and the boron concentration and d11B of the total procedural blank; #2, uncorrected; #2 2 se; 154-925E; 154-926A; 154-927B; 154-928A; 154-929A; 165-999A; 202-1241A; Age; AGE; Alkenone C37:2, d13C; average; B/Ca; Bathy depth; Boron/Calcium ratio; C37:2 d13C; Calculated; Calculated from C37 alkenones (Brassell et al., 1986); Carbonate ion; Carbonate ion, standard deviation; Carbon dioxide; Carbon dioxide, partial pressure; Carbon dioxide, partial pressure maximum; Carbon dioxide, partial pressure minimum; Caribbean Sea; CO2; d11B; d11B std dev; Degree of saturation with respect to CaCO3.; delta 11B; delta 11B, standard deviation; Depth; Depth, bathymetric; Depth, reconstructed; DEPTH, sediment/rock; Depth of GLODAP (Key et al., 2004, doi:10.1029/2004GB002247) Site used to calculate the degree of saturation; DRILL; Drilling/drill rig; epsilon p; epsilon p37:2; Event; G. ruber d18O; G. sacculifer d13C; Gas chromatography - Isotope ratio mass spectrometer (GC-IRMS); Globigerinoides ruber, d18O; Globigerinoides sacculifer, d13C; Growth rated corrected pCO2 based on MART record (O'Dea et al., 2007, doi:10.1073/pnas.0610947104); ICP-MS, Thermo Fisher Scientific, Element 2; Isotopic fractionation, during photosynthis; Joides Resolution; Leg154; Leg165; Leg202; Mass spectrometer Finnigan MAT 251; Mass spectrometer Finnigan MAT 252; MC-ICP-MS, Thermo Fisher Scientific NEPTUN; mmol/mol, is accurate to ± 5 % at 95% confidence (Foster, 2008, doi:10.1016/j.epsl.2008.04.015; Ni et al., 2007, doi:10.1029/2006PA001337); MOD, carbonate ion concentration from the model of Tyrell and Zeebe (2004, doi:10.1016/j.gca.2004.02.018) adjusted to fit the modern [CO3**2-] at this site at the relevant habitat depth (see Foster, 2008, doi:10.1016/j.epsl.2008.04.015); MOD, pCO2 of surface seawater determined from pH and modelled [CO3**2-]. To account for potential salinity variations and including the propagated uncertainty of pH and [CO3**2-] we have placed a conservative uncertainty of ± 25 ppm on this estimates; MOD, pCO2 of surface seawater determined from pH and modelled [CO32-]. To account for potential salinity variations and including the propagated uncertainty of pH and [CO3**2-] we have placed a conservative uncertainty of ± 25 ppm on this estimates; North Atlantic Ocean; North Pacific Ocean; Ocean Drilling Program; ODP; ODP sample designation; of pCO2ALK resulting from a ± 5 % change in TA [ppmv]; pCO2; pCO2 max; pCO2 max, unadjusted pCO2 when b-term (min/max) = 120; pCO2 max, unadjusted pCO2 when b-term (min/max) = 90/108; pCO2 min; pCO2 min, unadjusted pCO2 when b-term (min/max) = 120; pCO2 min, unadjusted pCO2 when b-term (min/max) = 90/108; pH; pH calculated from d11B using equation (7) with an uncertainty based largely on d11B of ± 0.02 pH units; ratio is accurate to +/- 5 % at 95% confidence (Foster, 2008, doi:10.1016/j.epsl.2008.04.015; Ni et al., 2007); ratio is accurate to +/- 5 % at 95% confidence (Foster, 2008, doi:10.1016/j.epsl.2008.04.015; Ni et al., 2007). Analyses of 165-925A and 165-929A are G. ruber pink. Ni et al. (2007, doi:10.1029/2006PA001337) note that the B/Ca of G. ruber white and G. ruber pink are identical within 5 %; Reconstr depth; Revised-size corr. pCO2 min, revised cell geometry corrected (min/max) pCO2 with b-term = 120; Revised-size corr. pCO2 min, revised cell geometry corrected (min/max) pCO2 with b-term = 90/108; Sample code/label; SampleLabel; Saturation index; Sea surface salinity; Sea surface temperature, annual mean; SI; Size corr. pCO2 max, revised cell geometry corrected pCO2 (min/max) with b = 90/120, correction based on Henderiks and Pagani (2007, doi:10.1029/2006PA001399). No size correction is required for samples <1.75 Ma in age; Size corr. pCO2 min, revised cell geometry corrected pCO2 (min/max) with b = 120 for, correction based on Henderiks and Pagani (2007, doi:10.1029/2006PA001399). No size correction is required for samples <1.75 Ma in age; Size corr. pCO2 min, revised cell geometry corrected pCO2 (min/max) with b = 90/120, correction based on Henderiks and Pagani (2007, doi:10.1029/2006PA001399). No size correction is required for samples <1.75 Ma in age; SSS; SST (1-12); TA, carbonate ion concentration determined assuming total alkalinty remains at modern values (2330 mmol/kg) with uncertainty relating to ±5% TA; TA, pCO2 of surface seawater determined from pH and assuming total alkalinity remains at the modern value of 2330 mmol/kg.; Uncertainty
Tipo

Dataset
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