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| Format: | Dataset Open Access |
| Sprache: | en |
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PANGAEA
2016
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| Schlagworte: | |
| Online-Zugang: | https://doi.org/10.1594/PANGAEA.859426 |
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| _version_ | 1867171839673892864 |
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| author | Banakar, Virupaxa K Baidya, Sweta Piotrowski, Alexander M Shankar, Doraiswami |
| author_facet | Banakar, Virupaxa K Baidya, Sweta Piotrowski, Alexander M Shankar, Doraiswami |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | The deglacial transition from the last glacial maximum at ∼20 kiloyears before present (ka) to the Holocene (11.7 ka to Present) was interrupted by millennial-scale cold reversals, viz., Antarctic Cold Reversal (∼14.5–12.8 ka) and Greenland Younger Dryas (∼12.8–11.8 ka) which had different timings and extent of cooling in each hemisphere. The cause of this synchronously initiated, but different hemispheric cooling during these cold reversals (Antarctic Cold Reversal ∼3∘C and Younger Dryas ∼10∘C) is elusive because CO2, the fundamental forcing for deglaciation, and Atlantic meridional overturning circulation, the driver of antiphased bipolar climate response, both fail to explain this asymmetry. We use centennial-resolution records of the local surface water 18O of the Eastern Arabian Sea, which constitutes a proxy for the precipitation associated with the Indian Summer Monsoon, and other tropical precipitation records to deduce the role of tropical forcing in the polar cold reversals. We hypothesize a mechanism for tropical forcing, via the Indian Summer Monsoons, of the polar cold reversals by migration of the Inter-Tropical Convergence Zone and the associated cross-equatorial heat transport. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_859426 |
| institution | PANGAEA |
| language | en |
| publishDate | 2016 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | SST time-series for Eastern Arabian Sea recostructed from paired measurement of δ¹⁸O and Mg/Ca of planktonic foraminifera Banakar, Virupaxa K Baidya, Sweta Piotrowski, Alexander M Shankar, Doraiswami ABP32GC01R; AGE; Age, comment; Calculated; Calculated (Epstein et al., 1953); Calculated from Mg/Ca ratios (Dekens et al. 2002); DEPTH, sediment/rock; Eastern Arabian Sea; GC; Globigerinoides sacculifer, Magnesium/Calcium ratio; Globigerinoides sacculifer, δ18O; Gravity corer; Sea surface salinity; Sea surface temperature, annual mean; δ18O, water The deglacial transition from the last glacial maximum at ∼20 kiloyears before present (ka) to the Holocene (11.7 ka to Present) was interrupted by millennial-scale cold reversals, viz., Antarctic Cold Reversal (∼14.5–12.8 ka) and Greenland Younger Dryas (∼12.8–11.8 ka) which had different timings and extent of cooling in each hemisphere. The cause of this synchronously initiated, but different hemispheric cooling during these cold reversals (Antarctic Cold Reversal ∼3∘C and Younger Dryas ∼10∘C) is elusive because CO2, the fundamental forcing for deglaciation, and Atlantic meridional overturning circulation, the driver of antiphased bipolar climate response, both fail to explain this asymmetry. We use centennial-resolution records of the local surface water 18O of the Eastern Arabian Sea, which constitutes a proxy for the precipitation associated with the Indian Summer Monsoon, and other tropical precipitation records to deduce the role of tropical forcing in the polar cold reversals. We hypothesize a mechanism for tropical forcing, via the Indian Summer Monsoons, of the polar cold reversals by migration of the Inter-Tropical Convergence Zone and the associated cross-equatorial heat transport. |
| title | SST time-series for Eastern Arabian Sea recostructed from paired measurement of δ¹⁸O and Mg/Ca of planktonic foraminifera |
| topic | ABP32GC01R; AGE; Age, comment; Calculated; Calculated (Epstein et al., 1953); Calculated from Mg/Ca ratios (Dekens et al. 2002); DEPTH, sediment/rock; Eastern Arabian Sea; GC; Globigerinoides sacculifer, Magnesium/Calcium ratio; Globigerinoides sacculifer, δ18O; Gravity corer; Sea surface salinity; Sea surface temperature, annual mean; δ18O, water |
| url | https://doi.org/10.1594/PANGAEA.859426 |