(Table 1) Age determination of ODP Hole 175-1084B
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| Formato: | Dataset Open Access |
| Lenguaje: | en |
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PANGAEA
2005
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| _version_ | 1867171827465322496 |
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| author | Farmer, E Christa deMenocal, Peter B Marchitto, Thomas M |
| author_facet | Farmer, E Christa deMenocal, Peter B Marchitto, Thomas M |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | Mg/Ca analyses of G. bulloides and abundances of N. pachyderma (left coiling) from Ocean Drilling Program (ODP) Leg 175 Hole 1084B in the Benguela coastal upwelling system document lower sea surface temperatures during the Last Glacial Maximum (LGM), Younger Dryas, mid-Holocene, and Little Ice Age in the southeastern Atlantic. Taking into consideration the possible effects of differential carbonate dissolution, the Mg/Ca data indicate Younger Dryas temperatures 2°-3°C cooler than those of the early Holocene and LGM temperatures 4°-5°C cooler than those of the early Holocene. The cool interval during the deglacial period at Hole 1084B matches the timing of Younger Dryas shifts in Cariaco Basin and Greenland Ice Sheet records and that of a nearby alkenone record. Comparison of mid-Holocene cooling at Hole ODP1084B with other high-resolution records of Holocene and last deglacial sea surface temperatures from the tropical Atlantic implies consistent basin-wide changes in atmospheric circulation. A brief period of 1.5°-2°C cooling between 17.8 and 17.2 ka, if related to Heinrich event 1, is consistent with a previously hypothesized tropical origin of all Heinrich climate change events. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_836843 |
| institution | PANGAEA |
| language | en |
| publishDate | 2005 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | (Table 1) Age determination of ODP Hole 175-1084B Farmer, E Christa deMenocal, Peter B Marchitto, Thomas M 175-1084B; Age, 14C AMS; Age, 14C calibrated; Age, comment; Age, dated; Age, dated standard error; Benguela Current, South Atlantic Ocean; Calendar age; Calendar age, maximum/old; Calendar age, minimum/young; DEPTH, sediment/rock; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Duration; Joides Resolution; Laboratory code/label; Leg175; Ocean Drilling Program; ODP; Sample code/label; Sedimentation rate Mg/Ca analyses of G. bulloides and abundances of N. pachyderma (left coiling) from Ocean Drilling Program (ODP) Leg 175 Hole 1084B in the Benguela coastal upwelling system document lower sea surface temperatures during the Last Glacial Maximum (LGM), Younger Dryas, mid-Holocene, and Little Ice Age in the southeastern Atlantic. Taking into consideration the possible effects of differential carbonate dissolution, the Mg/Ca data indicate Younger Dryas temperatures 2°-3°C cooler than those of the early Holocene and LGM temperatures 4°-5°C cooler than those of the early Holocene. The cool interval during the deglacial period at Hole 1084B matches the timing of Younger Dryas shifts in Cariaco Basin and Greenland Ice Sheet records and that of a nearby alkenone record. Comparison of mid-Holocene cooling at Hole ODP1084B with other high-resolution records of Holocene and last deglacial sea surface temperatures from the tropical Atlantic implies consistent basin-wide changes in atmospheric circulation. A brief period of 1.5°-2°C cooling between 17.8 and 17.2 ka, if related to Heinrich event 1, is consistent with a previously hypothesized tropical origin of all Heinrich climate change events. |
| title | (Table 1) Age determination of ODP Hole 175-1084B |
| topic | 175-1084B; Age, 14C AMS; Age, 14C calibrated; Age, comment; Age, dated; Age, dated standard error; Benguela Current, South Atlantic Ocean; Calendar age; Calendar age, maximum/old; Calendar age, minimum/young; DEPTH, sediment/rock; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Duration; Joides Resolution; Laboratory code/label; Leg175; Ocean Drilling Program; ODP; Sample code/label; Sedimentation rate |
| url | https://doi.org/10.1594/PANGAEA.836843 |