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Kandiano, Evgenia S; van der Meer, Marcel T J; Bauch, Henning A; Helmke, Jan Peter; Sinninghe Damsté, Jaap S; Schouten, Stefan (2016): Paleoceanographical studies of MIS 11 for sediment core MD99-2277. PANGAEA, https://doi.org/10.1594/PANGAEA.865410, Supplement to: Kandiano, ES et al. (2016): A cold and fresh ocean surface in the Nordic Seas during MIS 11: Significance for the future ocean. Geophysical Research Letters, 43(20), 10929-10937, https://doi.org/10.1002/2016GL070294

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Abstract:
Paleoceanographical studies of Marine Isotope Stage (MIS) 11 have revealed higher-than-present sea surface temperatures (SSTs) in the North Atlantic and in parts of the Arctic, but lower-than-present SSTs in the Nordic Seas, the main throughflow-area of warm water into the Arctic Ocean. We resolve this contradiction by complementing SST data based on planktic foraminiferal abundances with surface salinity changes using hydrogen isotopic compositions of alkenones in a core from the central Nordic Seas. The data indicate the prevalence of a relatively cold, low-salinity, surface water layer in the Nordic Seas during most of MIS 11. In spite of the low-density surface layer, which was kept buoyant by continuous melting of surrounding glaciers, warmer Atlantic water was still propagating northward at the subsurface thus maintaining meridional overturning circulation. This study can help to better constrain the impact of continuous melting of Greenland and Arctic ice on high-latitude ocean circulation and climate.
Coverage:
Latitude: 69.250167 * Longitude: -6.321167
Date/Time Start: 1999-08-01T00:00:00 * Date/Time End: 1999-08-01T00:00:00
Minimum DEPTH, sediment/rock: 10.285 m * Maximum DEPTH, sediment/rock: 11.395 m
Event(s):
MD99-2277 (61F) * Latitude: 69.250167 * Longitude: -6.321167 * Date/Time: 1999-08-01T00:00:00 * Elevation: -2800.0 m * Recovery: 36.65 m * Location: Jan Mayen Ridge * Campaign: MD114 (IMAGES V) * Basis: Marion Dufresne * Device: Calypso Corer (CALYPSO)
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethodComment
1DEPTH, sediment/rockDepthmKandiano, Evgenia SGeocode
2AGEAgeka BPKandiano, Evgenia SGeocode
3δ Deuterium, Alkenone, C37δD C37‰ SMOWKandiano, Evgenia S
4δDeuterium, Alkenone, C37, standard deviationδD C37 std dev±Kandiano, Evgenia S
5Neogloboquadrina pachyderma sinistralN. pachyderma s%Helmke, Jan Peter
6Turborotalita quinquelobaT. quinqueloba%Helmke, Jan Peter
7Sea surface temperature, summerSST sum°CKandiano, Evgenia S0-150 m water depth
8Dissimilarity indexDISSKandiano, Evgenia S
9δ Deuterium, AlkenoneδD Alk‰ SMOWKandiano, Evgenia Slong chain alkenones, # = averaged values
10DifferenceDiffKandiano, Evgenia SDelta SSS (calculated for E. huxleyi, Schouten 2006+M'Boule, 2014), relative to reconstructed absolute salinity core top M23060, reconstruced modern SSS = 39
11DifferenceDiffKandiano, Evgenia SDelta SSS (calculated for G. oceanica, Schouten et al., 2006), relative to reconstructed absolute salinity core top M23060, reconstrucetd modern SSS = 49
Size:
264 data points

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