Jöhnck, Janika; Kuhnt, Wolfgang; Holbourn, Ann E; Andersen, Nils (2020): Benthic and planktic foraminiferal carbon and oxygen isotopes and Mg/Ca-derived mixed layer temperatures from IODP Hole 353-U1448A and 353-U1448B in the Andaman Sea [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.921091
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Published: 2020-07-30 • DOI registered: 2020-10-20
Abstract:
We reconstructed the Indian Monsoon variability of the Earth's strongest hydrological system, at International Ocean Discovery Program (IODP) Expedition 353 Site U1448 in the Andaman Sea over the interval 6.24 to 4.91 Ma. We used high-resolution benthic and planktic foraminiferal carbon and oxygen isotopes and Mg/Ca measurements of the mixed layer foraminifer Trilobatus sacculifer to reconstruct the isotopic composition of seawater (δ¹⁸Osw) and the gradient between planktic and benthic foraminiferal δ¹³C.
Keyword(s):
Supplement to:
Jöhnck, Janika; Kuhnt, Wolfgang; Holbourn, Ann E; Andersen, Nils (2020): Variability of the Indian Monsoon in the Andaman Sea across the Miocene-Pliocene transition. Paleoceanography and Paleoclimatology, https://doi.org/10.1029/2020PA003923
Further details:
Anand, Pallavi; Elderfield, Henry; Conte, Maureen H (2003): Calibration of Mg/Ca thermometry in planktonic foraminifera from a sediment trap time series. Paleoceanography, 18(2), 1050, https://doi.org/10.1029/2002PA000846
Bemis, E B; Spero, Howard J; Bijma, Jelle; Lea, David W (1998): Reevaluation of the oxygen isotopic composition of planktonic foraminifera: Experimental results and new paleotemperature equations. Paleoceanography, 13(2), 150-160, https://doi.org/10.1029/98PA00070
Jöhnck, Janika; Kuhnt, Wolfgang; Holbourn, Ann E (2020): Data report: revised late Miocene splice of IODP Site U1448 (353-U1448B-48F-1, 1 cm, to 353-U1448A-56X-5, 60 cm), Expedition 353, Indian Monsoon Rainfall. In: Clemens, S.C.; Kuhnt, W.; LeVay, L.J.; Expedition 353 Scientists (eds.), Volume 353: Indian Monsoon Rainfall, Proceedings of the International Ocean Discovery Program, 353, International Ocean Discovery Program, https://doi.org/10.14379/iodp.proc.353.202.2020
Mohtadi, Mahyar; Prange, Matthias; Oppo, Delia W; De Pol-Holz, Ricardo; Merkel, Ute; Zhang, Xiao; Steinke, Stephan; Lückge, Andreas (2014): North Atlantic forcing of tropical Indian Ocean climate. Nature, 509(7498), 76-80, https://doi.org/10.1038/nature13196
Coverage:
Median Latitude: 10.635300 * Median Longitude: 93.000100 * South-bound Latitude: 10.633900 * West-bound Longitude: 93.000100 * North-bound Latitude: 10.636700 * East-bound Longitude: 93.000100
Minimum DEPTH, sediment/rock: 301.280 m * Maximum DEPTH, sediment/rock: 379.030 m
Event(s):
353-U1448A * Latitude: 10.633900 * Longitude: 93.000100 * Elevation: -1098.3 m * Campaign: Exp353 * Basis: Joides Resolution * Method/Device: Core drilling (CDRILL)
353-U1448B * Latitude: 10.636700 * Longitude: 93.000100 * Elevation: -1096.5 m * Campaign: Exp353 * Basis: Joides Resolution * Method/Device: Core drilling (CDRILL)
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Event label | Event | Jöhnck, Janika | |||
| 2 | Sample code/label | Sample label | Jöhnck, Janika | DSDP/ODP/IODP sample designation | ||
| 3 | DEPTH, sediment/rock | Depth sed | m | Jöhnck, Janika | Geocode – CSF-A in meters below sea floor (mbsf) | |
| 4 | Depth, composite revised | Depth comp r | rmcd | Jöhnck, Janika | see Jöhnck et al. (2020) | CCSF in revised meters composite depth (rmcd) |
| 5 | AGE | Age | ka BP | Jöhnck, Janika | Geocode | |
| 6 | Species | Species | Jöhnck, Janika | |||
| 7 | Foraminifera, benthic δ13C | Foram benth δ13C | ‰ PDB | Jöhnck, Janika | Mass spectrometer (MSPEC) | vs. VPDB |
| 8 | Foraminifera, benthic δ18O | Foram benth δ18O | ‰ PDB | Jöhnck, Janika | Mass spectrometer (MSPEC) | vs. VPDB, measured |
| 9 | Cibicidoides wuellerstorfi, δ13C | C. wuellerstorfi δ13C | ‰ PDB | Jöhnck, Janika | Mass spectrometer (MSPEC) | vs. VPDB |
| 10 | Foraminifera, benthic δ18O | Foram benth δ18O | ‰ PDB | Jöhnck, Janika | Mass spectrometer (MSPEC) | vs. VPDB, normalized to Cibicidoides wuellerstorfi. |
| 11 | Size fraction | Size fraction | Jöhnck, Janika | T. sacculifer stable isotope size fraction (µm): size fraction used to pick Trilobatus sacculifer for stable isotope analysis. | ||
| 12 | Trilobatus sacculifer, δ13C | T. sacculifer δ13C | ‰ PDB | Jöhnck, Janika | Mass spectrometer (MSPEC) | vs. VPDB, measured |
| 13 | Trilobatus sacculifer, δ18O | T. sacculifer δ18O | ‰ PDB | Jöhnck, Janika | Mass spectrometer (MSPEC) | vs. VPDB |
| 14 | Trilobatus sacculifer, δ13C | T. sacculifer δ13C | ‰ PDB | Jöhnck, Janika | Mass spectrometer (MSPEC) | vs. VPDB, 250-315 µm fraction |
| 15 | Δδ18O, gradient | Δδ18O grad | ‰ PDB | Jöhnck, Janika | Gradient between planktic and benthic O-isotope data (vs. VPDB). | |
| 16 | Δδ13C, gradient | Δδ13C grad | ‰ PDB | Jöhnck, Janika | Gradient between planktic and benthic C-isotope data ( vs. VPDB). Note: Only Trilobatus sacculifer d13C data from size fraction 250-315 µm and Cibicidoides wuellerstorfi d13C data are used for paleoclimatic reconstruction. | |
| 17 | δ18O, seawater, reconstructed | δ18Osw | ‰ SMOW | Jöhnck, Janika | Calculated according to Bemis et al., 1998 | O-isotopic composition of seawater (permille vs. Standard Mean Ocean Water). |
| 18 | δ18O, seawater, reconstructed | δ18Osw | ‰ SMOW | Jöhnck, Janika | Corrected | O-isotopic composition of seawater (permille vs. Standard Mean Ocean Water) corrected for 50 % estimate of ice volume component of benthic d18O. |
| 19 | Size fraction | Size fraction | Jöhnck, Janika | T. sacculifer Mg/Ca size fraction (µm): size fraction used to pick Trilobatus sacculifer for Mg/Ca analysis. | ||
| 20 | Trilobatus sacculifer, Magnesium/Calcium ratio | T. sacculifer Mg/Ca | mmol/mol | Jöhnck, Janika | ||
| 21 | Mixed layer temperature | MLT | °C | Jöhnck, Janika | Calculated, according to Anand et al. (2003) | Mg/Ca-derived temperatures using the equation of Anand et al. (2003) for G. sacculifer without sac, 350-500 µm. |
| 22 | Mixed layer temperature | MLT | °C | Jöhnck, Janika | Calculated according to (Mohtadi et al. 2014) | Lower mixed layer temperature limit calculated following the error propagation described in Mohtadi et al. (2014). |
| 23 | Mixed layer temperature | MLT | °C | Jöhnck, Janika | Calculated according to (Mohtadi et al. 2014) | Upper mixed layer temperature limit calculated following the error propagation described in Mohtadi et al. (2014). |
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0)
Size:
14200 data points
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