Matches in SemOpenAlex for { <https://semopenalex.org/work/W4322005883> ?p ?o ?g. }
Showing items 1 to 76 of
76
with 100 items per page.
- W4322005883 abstract "The mid-Pliocene (3.3-3.0 Ma) is a time when the Earth's climate fluctuated between cold glacial conditions (marine isotope stage M2; 3.3 Ma) and periods when global temperatures were ~3°C warmer than the pre-industrial (Mid-Pliocene warm period; 3.3-3.025 Ma) when CO2 concentrations reached ~400 ppm. Thus, the paleoclimate reconstruction of this time interval provides an analogue of the present-day and near-future climate change in a moderate pCO2 increase scenario. Although fluctuations in benthic δ18O in the mid-Pliocene were predominantly associated with Northern Hemisphere glacial dynamics, the contribution of Antarctic ice to mid-Pliocene glacial-interglacial cyclicity is unknown. Moreover, the surface oceanographic response of the Southern Ocean to Pliocene glacial-interglacial climate change is poorly documentedWe studied 2 sedimentary records from offshore west Tasmania (ODP Site 1168) and the Agulhas Plateau (IODP Site U1475), both located close to the modern position of the subtropical front (STF) in the Southern Ocean and encompassing the mid-Pliocene. The STF is a crucial surface water mass boundary separating cold, fresher subantarctic waters and warm, more saline subtropical waters and plays a key role in global ocean circulation, ocean-atmosphere CO2 exchange and meridional heat transport.We use lipid biomarkers, dinoflagellate cyst assemblages and benthic foraminiferal clumped isotopes to reconstruct surface and bottom oceanographic conditions over the mid-Pliocene including the M2 glaciation. We identify similar sea surface temperature (SST) changes at the two sites. Site 1168 SST cools from 18°C to 12°C and at Site U1475 from 21°C to 18°C across the M2 glaciation. Dinoflagellate cyst assemblages suggest strong latitudinal shifts of the subtropical front associated to Pliocene glacial-interglacial climate changes. However, the most profound assemblage shift occurs at the M2 deglaciation stage at both sites, suggesting strong and unprecedented surface water freshening. Preliminary clumped isotope results suggest bottom water temperatures at Site 1168 are stable around 9°C between M2 and mid-Piacenzian warm period, indicating that the enrichment in δ18O across the M2 is mainly contributed by large ice volume changes. We interpret the surface water freshening of the subantarctic zone as signaling major iceberg calving following the M2 glaciation, suggesting that the Antarctic contribution to the M2 glaciation was profound." @default.
- W4322005883 created "2023-02-26" @default.
- W4322005883 creator A5015450343 @default.
- W4322005883 creator A5024097436 @default.
- W4322005883 creator A5029703911 @default.
- W4322005883 creator A5036051661 @default.
- W4322005883 creator A5036818831 @default.
- W4322005883 creator A5047952831 @default.
- W4322005883 creator A5059825760 @default.
- W4322005883 creator A5090695206 @default.
- W4322005883 date "2023-05-15" @default.
- W4322005883 modified "2023-09-29" @default.
- W4322005883 title "Mid-Pliocene subtropical front variability in the Southern Ocean" @default.
- W4322005883 doi "https://doi.org/10.5194/egusphere-egu23-7924" @default.
- W4322005883 hasPublicationYear "2023" @default.
- W4322005883 type Work @default.
- W4322005883 citedByCount "0" @default.
- W4322005883 crossrefType "posted-content" @default.
- W4322005883 hasAuthorship W4322005883A5015450343 @default.
- W4322005883 hasAuthorship W4322005883A5024097436 @default.
- W4322005883 hasAuthorship W4322005883A5029703911 @default.
- W4322005883 hasAuthorship W4322005883A5036051661 @default.
- W4322005883 hasAuthorship W4322005883A5036818831 @default.
- W4322005883 hasAuthorship W4322005883A5047952831 @default.
- W4322005883 hasAuthorship W4322005883A5059825760 @default.
- W4322005883 hasAuthorship W4322005883A5090695206 @default.
- W4322005883 hasConcept C111368507 @default.
- W4322005883 hasConcept C11864286 @default.
- W4322005883 hasConcept C127313418 @default.
- W4322005883 hasConcept C134097258 @default.
- W4322005883 hasConcept C151730666 @default.
- W4322005883 hasConcept C15739521 @default.
- W4322005883 hasConcept C162501224 @default.
- W4322005883 hasConcept C186240526 @default.
- W4322005883 hasConcept C187599188 @default.
- W4322005883 hasConcept C18903297 @default.
- W4322005883 hasConcept C2777678158 @default.
- W4322005883 hasConcept C2780368712 @default.
- W4322005883 hasConcept C2780518792 @default.
- W4322005883 hasConcept C2780618852 @default.
- W4322005883 hasConcept C49204034 @default.
- W4322005883 hasConcept C83042747 @default.
- W4322005883 hasConcept C86803240 @default.
- W4322005883 hasConceptScore W4322005883C111368507 @default.
- W4322005883 hasConceptScore W4322005883C11864286 @default.
- W4322005883 hasConceptScore W4322005883C127313418 @default.
- W4322005883 hasConceptScore W4322005883C134097258 @default.
- W4322005883 hasConceptScore W4322005883C151730666 @default.
- W4322005883 hasConceptScore W4322005883C15739521 @default.
- W4322005883 hasConceptScore W4322005883C162501224 @default.
- W4322005883 hasConceptScore W4322005883C186240526 @default.
- W4322005883 hasConceptScore W4322005883C187599188 @default.
- W4322005883 hasConceptScore W4322005883C18903297 @default.
- W4322005883 hasConceptScore W4322005883C2777678158 @default.
- W4322005883 hasConceptScore W4322005883C2780368712 @default.
- W4322005883 hasConceptScore W4322005883C2780518792 @default.
- W4322005883 hasConceptScore W4322005883C2780618852 @default.
- W4322005883 hasConceptScore W4322005883C49204034 @default.
- W4322005883 hasConceptScore W4322005883C83042747 @default.
- W4322005883 hasConceptScore W4322005883C86803240 @default.
- W4322005883 hasLocation W43220058831 @default.
- W4322005883 hasOpenAccess W4322005883 @default.
- W4322005883 hasPrimaryLocation W43220058831 @default.
- W4322005883 hasRelatedWork W2011418907 @default.
- W4322005883 hasRelatedWork W2017569453 @default.
- W4322005883 hasRelatedWork W2038809338 @default.
- W4322005883 hasRelatedWork W2136679708 @default.
- W4322005883 hasRelatedWork W2147447703 @default.
- W4322005883 hasRelatedWork W2354186163 @default.
- W4322005883 hasRelatedWork W2945747567 @default.
- W4322005883 hasRelatedWork W3161280103 @default.
- W4322005883 hasRelatedWork W4247486656 @default.
- W4322005883 hasRelatedWork W51498396 @default.
- W4322005883 isParatext "false" @default.
- W4322005883 isRetracted "false" @default.
- W4322005883 workType "article" @default.