468 research outputs found
GDGT and GMGT data
No full text* These data represent:
Raw data presented in Sluijs et al., 2020 (Climate of the Past)
- Peak areas of GDGTs and GMGTs peaks across the late Paleocene - early Eocene of Hole 4 of the Arctic Coring EXpecition (ACEX).
- Abundances of isoGDGTs and and chrenarchaeol in the modern peat dataset.
* where
The data were generated on sediment samples taken from drill cores retreived from Lomonosov Ridge, Arctic Ocean, 2004 by the Integrated Ocean Drilling Program, stored in the Bremen Core Repository. For the present paper, we analyzed organic lipid extracts previously documented by Sluijs et al., (2006; 2008; 2009) using the current methodological standards.
* when and how
The lipid extracts were analyzed in 2018 in the organic geochemical laboratory at Utrecht University using Ultra High Performance liquid chromatography and atmospheric pressure chemical ionization mass spectrometry using an Agilent 1260 Infinity series HPLC system coupled to an Agilent 6130 single-quadrupole mass spectrometer (methods follow Hopmans et al., 2016)
* why
We re-analyzed the extracts because analytical methodology has improved since the generation of the original datasets and because the dataset from the Arctic is crucial for Paleocene-Eocene climatology
A middle Eocene carbon cycle conundrum
No full textThe Middle Eocene Climatic Optimum (MECO) was an approximately 500,000-year-long episode of widespread ocean–atmosphere warming about 40 million years ago, superimposed on a long-term middle Eocene cooling trend. It was marked by a rise in atmospheric CO2 concentrations, biotic changes and prolonged carbonate dissolution in the deep ocean. However, based on carbon cycle theory, a rise in atmospheric CO2 and warming should have enhanced continental weathering on timescales of the MECO. This should have in turn increased ocean carbonate mineral saturation state and carbonate burial in deep-sea sediments, rather than the recorded dissolution. We explore several scenarios using a carbon cycle model in an attempt to reconcile the data with theory, but these simulations confirm the problem. The model only produces critical MECO features when we invoke a sea-level rise, which redistributes carbonate burial from deep oceans to continental shelves and decreases shelf sediment weathering. Sufficient field data to assess this scenario is currently lacking. We call for an integrated approach to unravel Earth system dynamics during carbon cycle variations that are of intermediate timescales (several hundreds of thousands of years), such as the MECO
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This is another working-class war: An Interview with Christian Appy
No full textCHRISTIAN APPY is best known for his two books dealing with the Vietnam war, Patriots: The Vietnam War Remembered from All Sides (Penguin, 2004), and Working-Class War: American Combat Soldiers and Vietnam (University of North Carolina Press, 1993). His work on Patriots, which he calls “the most challenging and rewarding work of my life,” took him throughout Vietnam and the United States, talking to more than 350 people about their memories of that long and bitterly divisive war. The result is an oral history that stretches from the summer of 1945, when Americans first parachuted into northern Vietnam, to April 30, 1975, when the last U.S. helicopter flew off the roof of the American Embassy annex in Saigon. He spoke to the ISR’s JOE ALLEN. Joe Allen, a member of Teamsters Local 705 in Chicago, is author of a three-part ISR series on the history of the Vietnam War that can be found at www.isreview.org
Carbonate geochemistry of IODP Hole 342-U1403A
No full textThis dataset belongs to a data compilation that contains total organic carbon content, calcium carbonate content and concentrations for major elements, covering the Paleocene-Eocene Thermal Maximum, for the following sites: Forada Site, Italy, IODP 302 Site M0004, IODP 342 Site U1403, Bass River Site, US, Lodo Gulch Site, US, ODP 121 Site 752, and ODP 189 Site 1172. The data were generated in the period between 2014 – 2017 at the GeoLab of Utrecht University in The Netherlands. Organic carbon and CaCO3 were calculated following decalcification and C/N analysis with a Fisons Instruments CNS NA 1500 analyzer. Major elements were measured using Inductively Coupled Plasma-Optical Emission Spectrometry (ICP-OES, Perkin Elmer 9224 Optima 3000) following total destruction with hydrogen fluoride. These data are used to determine the redox conditions at the sites mentioned above. Here, we present the carbonate geochemistry of IODP Hole 342-U1403A
Carbonate geochemistry of ODP Site 174AX (Bass River)
No full textThis dataset belongs to a data compilation that contains total organic carbon content, calcium carbonate content and concentrations for major elements, covering the Paleocene-Eocene Thermal Maximum, for the following sites: Forada Site, Italy, IODP 302 Site M0004, IODP 342 Site U1403, Bass River Site, US, Lodo Gulch Site, US, ODP 121 Site 752, and ODP 189 Site 1172. The data were generated in the period between 2014 – 2017 at the GeoLab of Utrecht University in The Netherlands. Organic carbon and CaCO3 were calculated following decalcification and C/N analysis with a Fisons Instruments CNS NA 1500 analyzer. Major elements were measured using Inductively Coupled Plasma-Optical Emission Spectrometry (ICP-OES, Perkin Elmer 9224 Optima 3000) following total destruction with hydrogen fluoride. These data are used to determine the redox conditions at the sites mentioned above. Here, we present the carbonate geochemistry of ODP Site 174AX (Bass River)
Carbonate geochemistry of ODP Hole 189-1172D
No full textThis dataset belongs to a data compilation that contains total organic carbon content, calcium carbonate content and concentrations for major elements, covering the Paleocene-Eocene Thermal Maximum, for the following sites: Forada Site, Italy, IODP 302 Site M0004, IODP 342 Site U1403, Bass River Site, US, Lodo Gulch Site, US, ODP 121 Site 752, and ODP 189 Site 1172. The data were generated in the period between 2014 – 2017 at the GeoLab of Utrecht University in The Netherlands. Organic carbon and CaCO3 were calculated following decalcification and C/N analysis with a Fisons Instruments CNS NA 1500 analyzer. Major elements were measured using Inductively Coupled Plasma-Optical Emission Spectrometry (ICP-OES, Perkin Elmer 9224 Optima 3000) following total destruction with hydrogen fluoride. These data are used to determine the redox conditions at the sites mentioned above. Here, we present the carbonate geochemistry of ODP Hole 189-1172D
Major element composition from an outcrop sample at Lodo Gulch Site, Panoche Hills, California
No full textThis dataset belongs to a data compilation that contains total organic carbon content, calcium carbonate content and concentrations for major elements, covering the Paleocene-Eocene Thermal Maximum, for the following sites: Forada Site, Italy, IODP 302 Site M0004, IODP 342 Site U1403, Bass River Site, US, Lodo Gulch Site, US, ODP 121 Site 752, and ODP 189 Site 1172. The data were generated in the period between 2014 – 2017 at the GeoLab of Utrecht University in The Netherlands. Organic carbon and CaCO3 were calculated following decalcification and C/N analysis with a Fisons Instruments CNS NA 1500 analyzer. Major elements were measured using Inductively Coupled Plasma-Optical Emission Spectrometry (ICP-OES, Perkin Elmer 9224 Optima 3000) following total destruction with hydrogen fluoride. These data are used to determine the redox conditions at the sites mentioned above. Here, we present the major element composition from an outcrop sample at Lodo Gulch Site
Major element composition from an outcrop sample at Forada Site, Southern Alps, Italy
No full textThis dataset belongs to a data compilation that contains total organic carbon content, calcium carbonate content and concentrations for major elements, covering the Paleocene-Eocene Thermal Maximum, for the following sites: Forada Site, Italy, IODP 302 Site M0004, IODP 342 Site U1403, Bass River Site, US, Lodo Gulch Site, US, ODP 121 Site 752, and ODP 189 Site 1172. The data were generated in the period between 2014 – 2017 at the GeoLab of Utrecht University in The Netherlands. Organic carbon and CaCO3 were calculated following decalcification and C/N analysis with a Fisons Instruments CNS NA 1500 analyzer. Major elements were measured using Inductively Coupled Plasma-Optical Emission Spectrometry (ICP-OES, Perkin Elmer 9224 Optima 3000) following total destruction with hydrogen fluoride. These data are used to determine the redox conditions at the sites mentioned above. Here, we present the major element compositionfrom an outcrop sample at Forada Site
Major element composition of ODP Hole 121-752A
No full textThis dataset belongs to a data compilation that contains total organic carbon content, calcium carbonate content and concentrations for major elements, covering the Paleocene-Eocene Thermal Maximum, for the following sites: Forada Site, Italy, IODP 302 Site M0004, IODP 342 Site U1403, Bass River Site, US, Lodo Gulch Site, US, ODP 121 Site 752, and ODP 189 Site 1172. The data were generated in the period between 2014 – 2017 at the GeoLab of Utrecht University in The Netherlands. Organic carbon and CaCO3 were calculated following decalcification and C/N analysis with a Fisons Instruments CNS NA 1500 analyzer. Major elements were measured using Inductively Coupled Plasma-Optical Emission Spectrometry (ICP-OES, Perkin Elmer 9224 Optima 3000) following total destruction with hydrogen fluoride. These data are used to determine the redox conditions at the sites mentioned above. Here, we present the major element composition of ODP Hole 121-752A
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