TY - JOUR T1 - Late Holocene glacial advance and ice shelf growth in Barilari Bay, Graham Land, west Antarctic Peninsula JF - GEOLOGICAL SOCIETY OF AMERICA BULLETIN Y1 - 2015 A1 - Christ, Andrew J. A1 - Talaia-Murray, Manique A1 - Elking, Natalie A1 - Domack, Eugene W. A1 - Leventer, Amy A1 - Lavoie, Caroline A1 - Brachfeld, Stefanie A1 - Yoo, Kyu-Cheul A1 - Gilbert, Robert A1 - Jeong, Sun-Mi A1 - Petrushak, Stephen A1 - Wellner, Julia A1 - LARISSA Grp AB - Three marine sediment cores were collected along the length of the fjord axis of Barilari Bay, Graham Land, west Antarctic Peninsula (65 degrees 55'S, 64 degrees 43'W). Multi-proxy analytical results constrained by high-resolution geochronological methods (Pb-210, radiocarbon, Cs-137) in concert with historical observations capture a record of Holocene paleoenvironmental variability. Our results suggest early and middle Holocene (>7022-2815 cal. {[}calibrated] yr B.P.) retreated glacial positions and seasonally open marine conditions with increased primary productivity. Climatic cooling increased sea ice coverage and decreased primary productivity during the Neoglacial (2815 to cal. 730 cal. yr B.P.). This climatic cooling culminated with glacial advance to maximum Holocene positions and expansion of a fjord-wide ice shelf during the Little Ice Age (LIA) (ca. 730-82 cal. yr B.P.). Seasonally open marine conditions were achieved and remnant ice shelves decayed within the context of recent rapid regional warming (82 cal. yr B.P. to present). Our findings agree with previously observed late Holocene cooling and glacial advance across the Antarctic Peninsula, suggesting that the LIA was a regionally significant event with few disparities in timing and magnitude. Comparison of the LIA Antarctic Peninsula record to the rest of the Southern Hemisphere demonstrates close synchronicity in the southeast Pacific and southern most Atlantic region but less coherence for the southwest Pacific and Indian Oceans. Comparisons with the Northern Hemisphere demonstrate that the LIA Antarctic Peninsula record was contemporaneous with pre-LIA cooling and sea ice expansion in the North Atlantic-Arctic, suggesting a global reach for these events. VL - 127 ER - TY - JOUR T1 - Holocene sea-surface temperature variability in the Chilean fjord region JF - Quaternary Research Y1 - 2014 A1 - Caniupán, Magaly A1 - Lamy, Frank A1 - Lange, Carina B. A1 - Kaiser, Jérôme A1 - Kilian, Rolf A1 - Arz, Helge W. A1 - León, Tania A1 - Mollenhauer, Gesine A1 - Sandoval, Susana A1 - De Pol-Holz, Ricardo A1 - Pantoja, Silvio A1 - Wellner, Julia A1 - Tiedemann, Ralf AB - 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°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 ~ 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°C and a cooling centered at ~ 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 ~ 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. VL - 82 UR - http://www.sciencedirect.com/science/article/pii/S0033589414000933 IS - 2 JO - Holocene sea-surface temperature variability in the Chilean fjord region ER - TY - JOUR T1 - Gualas Glacier sedimentary record of climate and environmental change, Golfo Elefantes, Western Patagonia (46.5°S) JF - The Holocene Y1 - 2011 A1 - Fernandez, Rodrigo A1 - Anderson, John A1 - Bertrand, Sébastien A1 - Wellner, Julia AB - Gualas Glacier is an outlet glacier of the Northern Patagonian Icefield, one of the largest temperate ice bodies on Earth. Golfo Elefantes, the depositional basin of Gualas Glacier, has a sedimentary record that spans, with some hiatuses, at least the last ~11.3±3.0 ka. During this period the gulf remained free of ice, as suggested by the absence of proximal glacimarine sediment and till in the sedimentary section. This implies that the arcuate terminal moraines that occur along the edges of Golfo Elefantes were formed during the waning stages of the local glacial maxima (Late Pleistocene) or the early Holocene. Between ~11.3±3.0 ka and ~4.2±0.3–1.4 ka, the basin received low sediment input consisting of fine-grained sediments in the form of low concentration density currents that filled bathymetric lows. Sediment discharge increased several times in the late Holocene (~ UR - http://hol.sagepub.com/content/early/2011/11/22/0959683611425545.abstract N1 - id: 2118 JO - Gualas Glacier sedimentary record of climate and environmental change, Golfo Elefantes, Western Patagonia (46.5°S) ER -