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  • 1
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    PANGAEA
    In:  Supplement to: Dahl, Kristina A; Oppo, Delia W (2006): Sea surface temperature pattern reconstructions in the Arabian Sea. Paleoceanography, 21(1), PA1014, https://doi.org/10.1029/2005PA001162
    Publication Date: 2023-05-12
    Description: Sea surface temperature (SST) and seawater d18O (d18Ow) were reconstructed in a suite of sediment cores from throughout the Arabian Sea for four distinct time intervals (0 ka, 8 ka, 15 ka, and 20 ka) with the aim of understanding the history of the Indian Monsoon and the climate of the Arabian Sea region. This was accomplished through the use of paired Mg/Ca and d18O measurements of the planktonic foraminifer Globigerinoides ruber. By analyzing basin-wide changes and changes in cross-basinal gradients, we assess both monsoonal and regional-scale climate changes. SST was colder than present for the majority of sites within all three paleotime slices. Furthermore, both the Indian Monsoon and the regional Arabian Sea mean climate have varied substantially over the past 20 kyr. The 20 ka and 15 ka time slices exhibit average negative temperature anomalies of 2.5°-3.5°C attributable, in part, to the influences of glacial atmospheric CO2 concentrations and large continental ice sheets. The elimination of the cross-basinal SST gradient during these two time slices likely reflects a decrease in summer monsoon and an increase in winter monsoon strength. Changes in d18Ow that are smaller than the d18O signal due to global ice volume reflect decreased evaporation and increased winter monsoon mixing. SSTs throughout the Arabian Sea were still cooler than present by an average of 1.4°C in the 8 ka time slice. These cool SSTs, along with lower d18Ow throughout the basin, are attributed to stronger than modern summer and winter monsoons and increased runoff and precipitation. The results of this study underscore the importance of taking a spatial approach to the reconstruction of processes such as monsoon upwelling.
    Type: Dataset
    Format: application/zip, 3 datasets
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  • 2
    Publication Date: 2023-05-12
    Keywords: Age, 14C AMS; Age, 14C calibrated; Age, dated; Age, dated material; Age, dated standard deviation; Arabian Sea; Calendar age; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; GGC; Giant gravity corer; TN047-6-GGC
    Type: Dataset
    Format: text/tab-separated-values, 36 data points
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  • 3
    Publication Date: 2023-05-12
    Keywords: DEPTH, water; LATITUDE; LONGITUDE; Month; Salinity; δ18O, water
    Type: Dataset
    Format: text/tab-separated-values, 552 data points
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  • 4
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    PANGAEA
    In:  Supplement to: Bice, Karen L; Birgel, Daniel; Meyers, Philip A; Dahl, Kristina A; Hinrichs, Kai-Uwe; Norris, Richard D (2006): A multiple proxy and modeling study of Cretaceous upper ocean temperatures and atmospheric CO2 concentrations. Paleoceanography, 21(1), PA2002, https://doi.org/10.1029/2005PA001203
    Publication Date: 2024-01-09
    Description: We estimate tropical Atlantic upper ocean temperatures using oxygen isotope and Mg/Ca ratios in well-preserved planktonic foraminifera extracted from Albian through Santonian black shales recovered during Ocean Drilling Program Leg 207 (North Atlantic Demerara Rise). On the basis of a range of plausible assumptions regarding seawater composition at the time the data support temperatures between 33° and 42°C. In our low-resolution data set spanning ~84-100 Ma a local temperature maximum occurs in the late Turonian, and a possible minimum occurs in the mid to early late Cenomanian. The relation between single species foraminiferal d18O and Mg/Ca suggests that the ratio of magnesium to calcium in the Turonian-Coniacian ocean may have been lower than in the Albian-Cenomanian ocean, perhaps coincident with an ocean 87Sr/86Sr minimum. The carbon isotopic compositions of distinct marine algal biomarkers were measured in the same sediment samples. The d13C values of phytane, combined with foraminiferal d13C and inferred temperatures, were used to estimate atmospheric carbon dioxide concentrations through this interval. Estimates of atmospheric CO2 concentrations range between 600 and 2400 ppmv. Within the uncertainty in the various proxies, there is only a weak overall correspondence between higher (lower) tropical temperatures and more (less) atmospheric CO2. The GENESIS climate model underpredicts tropical Atlantic temperatures inferred from ODP Leg 207 foraminiferal d18O and Mg/Ca when we specify approximate CO2 concentrations estimated from the biomarker isotopes in the same samples. Possible errors in the temperature and CO2 estimates and possible deficiencies in the model are discussed. The potential for and effects of substantially higher atmospheric methane during Cretaceous anoxic events, perhaps derived from high fluxes from the oxygen minimum zone, are considered in light of recent work that shows a quadratic relation between increased methane flux and atmospheric CH4 concentrations. With 50 ppm CH4, GENESIS sea surface temperatures approximate the minimum upper ocean temperatures inferred from proxy data when CO2 concentrations specified to the model are near those inferred using the phytane d13C proxy. However, atmospheric CO2 concentrations of 3500 ppm or more are still required in the model in order to reproduce inferred maximum temperatures.
    Keywords: Deep Sea Drilling Project; DSDP; Ocean Drilling Program; ODP
    Type: Dataset
    Format: application/zip, 3 datasets
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  • 5
    Publication Date: 2024-01-09
    Keywords: 14-144; 207-1257C; 207-1258B; 207-1260B; Deep Sea Drilling Project; DEPTH, sediment/rock; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Elevation of event; Event label; Globigerinelloides spp., δ13C; Globigerinelloides spp., δ18O; Glomar Challenger; Hedbergella delrioensis, δ13C; Hedbergella delrioensis, δ18O; Heterohelix globulosa, δ13C; Heterohelix globulosa, δ18O; Heterohelix moremani, δ13C; Heterohelix moremani, δ18O; Joides Resolution; Latitude of event; Leg14; Leg207; Longitude of event; Magnesium/Calcium ratio; Marginotruncana sinuosa, δ13C; Marginotruncana sinuosa, δ18O; North Atlantic/CONT RISE; Ocean Drilling Program; ODP; Sample code/label; Size fraction; South Atlantic Ocean; Stage; Ticinella primula, δ13C; Ticinella primula, δ18O; Whiteinella baltica, δ13C; Whiteinella baltica, δ18O
    Type: Dataset
    Format: text/tab-separated-values, 111 data points
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  • 6
    Publication Date: 2024-01-09
    Keywords: 14-144; 207-1257C; 207-1258B; 207-1260B; AGE; Calculated from stable oxygen isotopes; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Elevation of event; Error, absolute; Event label; Glomar Challenger; Joides Resolution; Latitude of event; Leg14; Leg207; Longitude of event; North Atlantic/CONT RISE; Ocean Drilling Program; ODP; Paleolatitude; Sample code/label; Sea surface temperature, annual mean; South Atlantic Ocean; Species; SST from Mg/Ca ratios
    Type: Dataset
    Format: text/tab-separated-values, 138 data points
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  • 7
    Publication Date: 2024-01-09
    Keywords: 207-1257C; 207-1258B; 207-1260B; Calcium carbonate; Carbon, organic, total; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Elevation of event; Event label; Joides Resolution; Latitude of event; Leg207; Longitude of event; Ocean Drilling Program; ODP; Phytane, δ13C; Sample code/label; South Atlantic Ocean; δ13C, carbonate; δ13C, organic carbon; δ15N; δ18O, carbonate
    Type: Dataset
    Format: text/tab-separated-values, 88 data points
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  • 8
    Publication Date: 2024-02-13
    Keywords: AGE; Arabian Sea; BC; Box corer; Elevation of event; Event label; GEMINO I; GGC; Giant gravity corer; Globigerinoides ruber, Magnesium/Calcium ratio; IOE105KK; IOE114KK; IOE143KK; KAL; Kasten corer; KL; KL-15, AS-03; KL-26, AS-02; KL-36, AS-04; KL-51, AS-07; KL-57, AS-08; KL-64, AS-09; KL-70, AS-10; KL-71; KL-74, AS-12; KL-79; KL-82, AS-14; KL-87, AS-15; Latitude of event; Longitude of event; MAKRAN 2; Mass; MUC; MultiCorer; PAKOMIN; Piston corer (BGR type); Sea surface temperature, annual mean; SO130; SO130_211KG; SO130_282KG; SO130_285MC; SO28; SO28-05KL; SO28-11KL; SO28-18KL; SO42; SO42-15KL; SO42-26KL; SO42-36KL; SO42-51KL; SO42-57KL; SO42-64KL; SO42-70KL; SO42-71KL; SO42-74KL; SO42-79KL; SO42-82KL; SO42-87KL; SO90; SO90_39; Sonne; SST from Mg/Ca ratios; TN047-6-GGC
    Type: Dataset
    Format: text/tab-separated-values, 174 data points
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  • 9
    Publication Date: 2013-03-28
    Print ISSN: 0095-4616
    Electronic ISSN: 1432-0606
    Topics: Mathematics
    Published by Springer
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  • 10
    Publication Date: 2016-10-12
    Description: Journal of Medicinal Chemistry DOI: 10.1021/acs.jmedchem.6b01127
    Topics: Chemistry and Pharmacology
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