Iceberg-rafted debris stack of sediment cores MD07-3133 and MD07-3134, 0-10 ka
Proxy-based indicators of past climate change show that current global climate models systematically underestimate Holocene-epoch climate variability on centennial to multi-millennial timescales, with the mismatch increasing for longer periods (Collins et al., 2002, doi:10.1175/1520-0442(2002)015<...
| Main Authors: | , , , , |
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| Format: | Dataset |
| Language: | English |
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PANGAEA
2016
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| Subjects: | |
| Online Access: | https://doi.pangaea.de/10.1594/PANGAEA.865349 https://doi.org/10.1594/PANGAEA.865349 |
| Summary: | Proxy-based indicators of past climate change show that current global climate models systematically underestimate Holocene-epoch climate variability on centennial to multi-millennial timescales, with the mismatch increasing for longer periods (Collins et al., 2002, doi:10.1175/1520-0442(2002)015<1497:ACOTVO>2.0.CO;2 Goosse et al., 2005, doi:10.1016/j.quascirev.2004.12.009 Zorita et al., 2010, doi:10.1007/s10584-010-9824-7 Lovejoy et al., 2013, doi:10.5194/esd-4-439-2013 Laepple and Huybers, 2014, doi:10.1073/pnas.1412077111 ). Proposed explanations for the discrepancy include ocean-atmosphere coupling that is too weak in models (Cane, 1998, doi:10.1126/science.282.5386.59 ), insufficient energy cascades from smaller to larger spatial and temporal scales (Ferrari & Wunsch, 2009, doi:10.1146/annurev.fluid.40.111406.102139 ) or that global climate models do not consider slow climate feedbacks related to the carbon cycle or interactions between ice sheets and climate (Lovejoy et al., 2013). Such interactions, however, are known to have strongly affected centennial- to orbital-scale climate variability during past glaciations (Broecker et al., 1992, doi:10.1007/BF00193540 Clark et al., 1999, doi:10.1126/science.286.5442.1104 Ganopolski & Rahmstorf, 2001, doi:10.1038/35051500 Liu et al., 2009, doi:10.1126/science.1171041 ), and are likely to be important in future climate change (Fogwill et al., 2015, doi:10.1002/2015EF000306 Green & Schmittner, 2015, doi:10.1175/JCLI-D-15-0110.1 Swingedouw et al., 2015, doi:10.1007/s00382-014-2270-x ). Here we show that fluctuations in Antarctic Ice Sheet discharge caused by relatively small changes in subsurface ocean temperature can amplify multi-centennial climate variability regionally and globally, suggesting that a dynamic Antarctic Ice Sheet may have driven climate fluctuations during the Holocene. We analysed high-temporal-resolution records of iceberg-rafted debris derived from the Antarctic Ice Sheet, and performed both ... |
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