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| Caniupan, Magaly; Lamy, Frank; Lange, Carina B.; Kaiser, Jerome; Kilian, Rolf; Arz, Helge W.; Leon, Tania; Mollenhauer, Gesine; Sandoval, Susana; De Pol-holz, Ricardo; Pantoja, Silvio; Wellner, Julia; Tiedemann, Ralf. |
| Here we provide three new Holocene (11-0 cal ka BP) alkenone-derived sea surface temperature (SST) records from the southernmost Chilean fjord region (50-53 degrees S). SST estimates may be biased towards summer temperature in this region, as revealed by a large set of surface sediments. The Holocene records show consistently warmer than present-day SSTs except for the past similar to 0.6 cal ka BP. However, they do not exhibit an early Holocene temperature optimum as registered further north off Chile and in Antarctica. This may have resulted from a combination of factors including decreased inflow of warmer open marine waters due to lower sea-level stands, enhanced advection of colder and fresher inner fjord waters, and stronger westerly winds. During... |
| Tipo: Text |
Palavras-chave: Holocene; Alkenones; Sea-surface temperature; Fjords; Chile. |
| Ano: 2014 |
URL: https://archimer.ifremer.fr/doc/00290/40088/39292.pdf |
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| De Deckker, P.; Moros, M.; Perner, K.; Blanz, T.; Wacker, L.; Schneider, R.; Barrows, T.t.; O’loingsigh, T.; Jansen, E.. |
| The Quaternary is well known for being a period of the geological record that saw significant and alternating climatic fluctuations. Here, we concentrate on the last 94 millennia that saw Australia and its surrounding seas undergo significant environmental changes. Importantly also it is during that this period of time includes the arrival and settlement of humans in Australia. Following on from Marine Isotopic Stage 4 (MIS4) that saw, over the period of 71-59 ka BP, a significant eustatic sea level drop (similar to 100 m), low sea-surface temperatures as well as glacial conditions on land, Australia experienced wet conditions again, but eventually progressively entered into a glacial phase. By then, humans had arrived on this large continent and later the... |
| Tipo: Text |
Palavras-chave: Oceanic fronts; Leeuwin Current; Foraminifer faunal analysis; Marine isotopic stages; Last Glacial Maximum; Palaeoceanography; Sea-surface temperature; Moraines; Modern analogue technique; Subantarctic Front; G. ruber. |
| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00657/76931/78127.pdf |
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| Romero, O. E.; Crosta, X.; Kim, J. -h.; Pichevin, L.; Crespin, J.. |
| Although productivity variations in coastal upwelling areas are mostly attributed to changes in wind strength, productivity dynamics in the Benguela Upwelling System (BUS) is less straightforward due to its complex atmospheric and hydrographic settings. In view of these settings, past productivity variations in the BUS can be better investigated with downcore sediments representing different productivity regimes. In this study, two sediment cores retrieved at ca. 25°–26°S in the BUS and representing different productivity regimes were studied. By using micropaleontological, geochemical and temperature proxies measured on core MD96-2098, recovered at 2910 m water depth in the bathypelagic zone at 26°S off Namibia, variations of filament front location,... |
| Tipo: Text |
Palavras-chave: Benguela; Diatoms; Millennial and submillennial time scale; Productivity; Sea-surface temperature; SW Atlantic; Upwelling filaments. |
| Ano: 2015 |
URL: https://archimer.ifremer.fr/doc/00294/40499/39432.pdf |
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