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Publicação
Millennial-scale ocean climate variability
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Autores
Orientador(es)
Resumo(s)
Marine sediment cores that span the last 50,000 years frequently show considerable variability
in sediment and biogeochemical variables. In the North Atlantic, a series of massive iceberg
and meltwater events (Heinrich events) were sourced from Hudson Strait and the Laurentide
Ice Sheet with a periodicity of ~7.2 ky and had significant impacts on the Atlantic meridional
overturning circulation and the global hydrological and biogeochemical cycles. Some marine
proxies show higher frequency, abrupt events, that may match the Dansgaard-Oeschger (D-O)
oscillations. Predictable millennial-scale periodicities and associated forcings have proved
elusive, and an observed ~1.5 ky cycle may be linked to stochastic resonance.
Descrição
Palavras-chave
Heinrich events Abrupt climate change Greenland interstadials Greenland stadials Dansgaard-Oeschger events Last glacial cycle Marine Isotope Stage 3
Contexto Educativo
Citação
Editora
Elsevier