Holocene sea-surface temperature variability in the Chilean fjord region
| Type | Article | ||||||||
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| Date | 2014-09 | ||||||||
| Language | English | ||||||||
| Author(s) | Caniupan Magaly1, Lamy Frank1, Lange Carina B.2, Kaiser Jerome3, Kilian Rolf4, Arz Helge W.3, Leon Tania2, Mollenhauer Gesine1, Sandoval Susana2, de Pol-Holz Ricardo5, Pantoja Silvio2, Wellner Julia6, Tiedemann Ralf1 | ||||||||
| Affiliation(s) | 1 : Alfred Wegener Inst Polar & Marine Res, D-27568 Bremerhaven, Germany. 2 : Univ Concepcion, Ctr Oceanog Res Eastern South Pacific COPAS, COPAS Sur Austral Program, Concepcion, Chile. 3 : Leibniz Inst Balt Sea Res Warnemunde, D-18199 Rostock, Warnemunde, Germany. 4 : Univ Trier, Dept Geol, FBVI, D-54296 Trier, Germany. 5 : Univ Concepcion, Dept Oceanog, Ctr Climate & Resilience Res CR2, Concepcion, Chile. 6 : Univ Houston, Dept Earth & Atmospher Sci, Houston, TX 77204 USA. |
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| Source | Quaternary Research (0033-5894) (Academic Press Inc Elsevier Science), 2014-09 , Vol. 82 , N. 2 , P. 342-353 | ||||||||
| DOI | 10.1016/j.yqres.2014.07.009 | ||||||||
| WOS© Times Cited | 29 | ||||||||
| Keyword(s) | Holocene, Alkenones, Sea-surface temperature, Fjords, Chile | ||||||||
| Abstract | 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 the mid-Holocene, pronounced short-term variations of up to 2.5 degrees C and a cooling centered at similar to 5 cal ka BP, which coincides with the first Neoglacial glacier advance in the Southern Andes, are recorded. The latest Holocene is characterized by two pronounced cold events centered at similar to 0.6 and 0.25 cal ka BP, i.e., during the Little Ice Age. These cold events have lower amplitudes in the offshore records, suggesting an amplification of the SST signal in the inner fjords. | ||||||||
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