Sea surface temperature reconstruction for ODP Hole 178-1098B


Autoria(s): Shevenell, Amelia E; Ingalls, Anitra E; Domack, Eugene W; Kelly, Ciarán
Cobertura

MEDIAN LATITUDE: -64.747965 * MEDIAN LONGITUDE: -63.631714 * SOUTH-BOUND LATITUDE: -64.890000 * WEST-BOUND LONGITUDE: -64.290000 * NORTH-BOUND LATITUDE: -64.340000 * EAST-BOUND LONGITUDE: -61.880000 * DATE/TIME START: 1998-03-13T00:00:00 * DATE/TIME END: 1998-03-13T00:00:00

Data(s)

08/09/2011

Resumo

The disintegration of ice shelves, reduced sea-ice and glacier extent, and shifting ecological zones observed around Antarctica (Cook et al., 2005, doi:10.1126/science.1104235; Stammerjohn et al., 2008, doi:10.1016/j.dsr2.2008.04.026) highlight the impact of recent atmospheric (Steig et al., 2009, doi:10.1038/nature07669) and oceanic warming (Gille, 2002, doi:10.1126/science.1065863) on the cryosphere. Observations (Cook et al., 2005, doi:10.1126/science.1104235; Stammerjohn et al., 2008, doi:10.1016/j.dsr2.2008.04.026) and models (Pollard and DeConto, 2009, doi:10.1038/nature07809) suggest that oceanic and atmospheric temperature variations at Antarctica's margins affect global cryosphere stability, ocean circulation, sea levels and carbon cycling. In particular, recent climate changes on the Antarctic Peninsula have been dramatic, yet the Holocene climate variability of this region is largely unknown, limiting our ability to evaluate ongoing changes within the context of historical variability and underlying forcing mechanisms. Here we show that surface ocean temperatures at the continental margin of the western Antarctic Peninsula cooled by 3-4 °C over the past 12,000?years, tracking the Holocene decline of local (65° S) spring insolation. Our results, based on TEX86 sea surface temperature (SST) proxy evidence from a marine sediment core, indicate the importance of regional summer duration as a driver of Antarctic seasonal sea-ice fluctuations (Huybers and Denton, 2008, doi:10.1038/ngeo311). On millennial timescales, abrupt SST fluctuations of 2-4 °C coincide with globally recognized climate variability (Mayewski et al., 2004, doi:10.1016/j.yqres.2004.07.001). Similarities between our SSTs, Southern Hemisphere westerly wind reconstructions (Moreno et al., 2010, doi:10.1130/G30962.1) and El Niño/Southern Oscillation variability (Conroy et al., 2008, doi:10.1016/j.quascirev.2008.02.015) indicate that present climate teleconnections between the tropical Pacific Ocean and the western Antarctic Peninsula (Yuan et al., 2004, doi:10.1017/S0954102004002238) strengthened late in the Holocene epoch. We conclude that during the Holocene, Southern Ocean temperatures at the western Antarctic Peninsula margin were tied to changes in the position of the westerlies, which have a critical role in global carbon cycling (Moreno et al., 2010, doi:10.1130/G30962.1; Anderson et al., 2009, doi:10.1126/science.1167441).

Formato

application/zip, 4 datasets

Identificador

https://doi.pangaea.de/10.1594/PANGAEA.769707

doi:10.1594/PANGAEA.769707

Idioma(s)

en

Publicador

PANGAEA

Direitos

CC-BY: Creative Commons Attribution 3.0 Unported

Access constraints: unrestricted

Fonte

Supplement to: Shevenell, Amelia E; Ingalls, Anitra E; Domack, Eugene W; Kelly, Ciarán (2011): Holocene Southern Ocean surface temperature variability west of the Antarctic Peninsula. Nature, 470(7333), 250-254, doi:10.1038/nature09751

Palavras-Chave #178-1098B; after Bentley et al. (2009, doi:10.1177/0959683608096603); after Kim et al. (2008, doi:10.1016/j.gca.2007.12.010); Age; AGE; Calculated; Calculated, TEX86; Calculated from stable oxygen isotopes; Crenarchaeol regio-isomer; d18O sw = -0.08 per mil (CDW), after Craig (1965); d18O sw = -0.08 per mil (CDW), after Shackleton (1974); d18O sw = -0.60 per mil (surface water), , after Shackleton (1974); d18O sw = -0.60 per mil (surface water), after Craig (1965); Depth; Depth, composite; DEPTH, sediment/rock; DEPTH, water; Depth comp; Depth water; Dicyclic glycerol dialkyl glycerol tetraether (peak area); Drake Passage; DRILL; Drilling/drill rig; GDGT; GDGT-1; GDGT-2; GDGT-3; GDGT-5 reg-iso; Glycerol dialkyl glycerol tetraether (peak area); High Performance Liquid Chromatography - Mass spectrometry (HPLC-MS); Intercore correlation; Joides Resolution; Label; Latitude; LATITUDE; Leg178; Longitude; LONGITUDE; Measured; Monocyclic glycerol dialkyl glycerol tetraether (peak area); N. pachyderma d18O; Neogloboquadrina pachyderma dextral and/or sinistral, d18O; No; Number; Ocean Drilling Program; ODP; ODP sample designation; Sample code/label; Sea surface temperature, annual mean; Sjunneskog amd Taylor (2002, doi:10.1029/2000PA000563); SST (1-12); Temp; Temperature, water; Tetraether index of 86 carbon atoms; TEX86; Tricyclic glycerol dialkyl glycerol tetraether (peak area)
Tipo

Dataset