Banakar, Virupaxa K; Baidya, Sweta; Piotrowski, Alexander M; Shankar, Doraiswami (2016): SST time-series for Eastern Arabian Sea recostructed from paired measurement of δ¹⁸O and Mg/Ca of planktonic foraminifera [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.859426
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Abstract:
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 𝛿18O 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.
Related to:
Banakar, Virupaxa K; Baidya, Sweta; Piotrowski, Alexander M; Shankar, Doraiswami (2017): Indian summer monsoon forcing on the deglacial polar cold reversals. Journal of Earth System Science, 126(6), https://doi.org/10.1007/s12040-017-0864-5
Coverage:
Latitude: 15.491500 * Longitude: 72.727330
Date/Time Start: 2008-10-15T00:00:00 * Date/Time End: 2008-10-15T00:00:00
Minimum DEPTH, sediment/rock: 0.59 m * Maximum DEPTH, sediment/rock: 4.21 m
Event(s):
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | DEPTH, sediment/rock | Depth sed | m | Banakar, Virupaxa K | Geocode | |
| 2 | AGE | Age | ka BP | Banakar, Virupaxa K | Geocode – radiocarbon measured at Arizona University's AMS Facility | |
| 3 | Age, comment | Comm | Banakar, Virupaxa K | |||
| 4 | Globigerinoides sacculifer, δ18O | G. sacculifer δ18O | ‰ PDB | Banakar, Virupaxa K | size fraction 250-355 µm, measured at Godwin Laboratory, University of Cambridge, UK | |
| 5 | Globigerinoides sacculifer, Magnesium/Calcium ratio | G. sacculifer Mg/Ca | mmol/mol | Banakar, Virupaxa K | size fraction 250-355 µm, measured at National Institute of Oceanography's ICP-OES Laboratory | |
| 6 | Sea surface temperature, annual mean | SST (1-12) | °C | Banakar, Virupaxa K | Calculated from Mg/Ca ratios (Dekens et al. 2002) | |
| 7 | δ18O, water | δ18O H2O | ‰ SMOW | Banakar, Virupaxa K | Calculated (Epstein et al., 1953) | calculated from residual d18O obtained from subtracting global ice-volume effect |
| 8 | Sea surface salinity | SSS | Banakar, Virupaxa K | Calculated | calculated from Dahl&Opp, 2006 Arabian Sea d18O-Salinity relationship |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
461 data points