Isotope measurements from late Paleocene - early Eocene of 5 cores from Atlantic and Pacific Ocean
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| Natura: | Dataset Open Access |
| Lingua: | en |
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PANGAEA
2003
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| _version_ | 1867167663671738368 |
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| author | Cramer, Benjamin S Wright, James D Kent, Dennis V Aubry, Marie-Pierre |
| author_facet | Cramer, Benjamin S Wright, James D Kent, Dennis V Aubry, Marie-Pierre |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | High-resolution stable carbon isotope records for upper Paleocene - lower Eocene sections at Ocean Drilling Program Sites 1051 and 690 and Deep Sea Drilling Project Sites 550 and 577 show numerous rapid (40 - 60 kyr duration) negative excursions of up to 1 per mill. We demonstrate that these transient decreases are the expected result of nonlinear insolation forcing of the carbon cycle in the context of a long carbon residence time. The transients occur at maxima in Earth's orbital eccentricity, which result in high-amplitude variations in insolation due to forcing by climatic precession. The construction of accurate orbital chronologies for geologic sections older than ~ 35 Ma relies on identifying a high-fidelity recorder of variations in Earth's orbital eccentricity. We use the carbon isotope records as such a recorder, establishing a robust orbitally tuned chronology for latest Paleocene-earliest Eocene events. Moreover, the transient decreases provide a means of precise correlation among the four sites that is independent of magnetostratigraphic and biostratigraphic data at the <10^5-year scale. While the eccentricity-controlled transient decreases bear some resemblance to the much larger-amplitude carbon isotope excursion (CIE) that marks the Paleocene/Eocene boundary, the latter event is found to occur near a minimum in the ~400-kyr eccentricity cycle. Thus the CIE occurred during a time of minimal variability in insolation, the dominant mechanism for forcing climate change on 104-year scales. We argue that this is inconsistent with mechanisms that rely on a threshold climate event to trigger the Paleocene/Eocene thermal maximum since any threshold would more likely be crossed during a period of high-amplitude climate variations. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_741863 |
| institution | PANGAEA |
| language | en |
| publishDate | 2003 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Isotope measurements from late Paleocene - early Eocene of 5 cores from Atlantic and Pacific Ocean Cramer, Benjamin S Wright, James D Kent, Dennis V Aubry, Marie-Pierre 113-690B; 171-1051A; 171-1051B; 80-550; 86-577; Blake Nose, North Atlantic Ocean; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; Glomar Challenger; Joides Resolution; Leg113; Leg171B; Leg80; Leg86; North Atlantic/PLAIN; North Pacific Ocean; Ocean Drilling Program; ODP; South Atlantic Ocean High-resolution stable carbon isotope records for upper Paleocene - lower Eocene sections at Ocean Drilling Program Sites 1051 and 690 and Deep Sea Drilling Project Sites 550 and 577 show numerous rapid (40 - 60 kyr duration) negative excursions of up to 1 per mill. We demonstrate that these transient decreases are the expected result of nonlinear insolation forcing of the carbon cycle in the context of a long carbon residence time. The transients occur at maxima in Earth's orbital eccentricity, which result in high-amplitude variations in insolation due to forcing by climatic precession. The construction of accurate orbital chronologies for geologic sections older than ~ 35 Ma relies on identifying a high-fidelity recorder of variations in Earth's orbital eccentricity. We use the carbon isotope records as such a recorder, establishing a robust orbitally tuned chronology for latest Paleocene-earliest Eocene events. Moreover, the transient decreases provide a means of precise correlation among the four sites that is independent of magnetostratigraphic and biostratigraphic data at the <10^5-year scale. While the eccentricity-controlled transient decreases bear some resemblance to the much larger-amplitude carbon isotope excursion (CIE) that marks the Paleocene/Eocene boundary, the latter event is found to occur near a minimum in the ~400-kyr eccentricity cycle. Thus the CIE occurred during a time of minimal variability in insolation, the dominant mechanism for forcing climate change on 104-year scales. We argue that this is inconsistent with mechanisms that rely on a threshold climate event to trigger the Paleocene/Eocene thermal maximum since any threshold would more likely be crossed during a period of high-amplitude climate variations. |
| title | Isotope measurements from late Paleocene - early Eocene of 5 cores from Atlantic and Pacific Ocean |
| topic | 113-690B; 171-1051A; 171-1051B; 80-550; 86-577; Blake Nose, North Atlantic Ocean; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; Glomar Challenger; Joides Resolution; Leg113; Leg171B; Leg80; Leg86; North Atlantic/PLAIN; North Pacific Ocean; Ocean Drilling Program; ODP; South Atlantic Ocean |
| url | https://doi.org/10.1594/PANGAEA.741863 |