SEDIS - Publications
Kemp, Alan E. S. (2003): Evidence for abrupt climate changes in annual laminated marine sediments
ODP 146 893
Kemp, Alan E. S.
University of Southampton, School of Ocean and Earth Science, Southampton, United Kingdom
Evidence for abrupt climate changes in annual laminated marine sediments
In: Lawton, John H. (editor), Marotzke, Jochem (editor), Marsh, Robert (editor), McCave, I. Nick (editor), Abrupt climate change; evidence, mechanisms and implications; papers of a discussion meeting
Royal Society of London, London, United Kingdom
Annually laminated sediments from marine or lacustrine settings represent valuable high-resolution archives of climate change that record variation due to changing precipitation and run-off from land or variation in biological productivity and flux in the water column. Because of their annual resolution such sediments may capture abrupt changes of interannual to decadal scales rivaling corals and ice cores in resolution. Laminated sediments often occur intermittently in the sediment column, and the onset and cessation of laminae commonly record the abrupt crossing of thresholds related to climate change, for example, in the degree of oxygenation of bottom waters. Such records from marginal basins and continental margins have been pivotal in demonstrating that abrupt changes hitherto documented only in high-latitude ice cores are synchronous with climatic change at low latitudes. These insights into global teleconnections have improved our understanding of the mechanisms of rapid climate change. In deep-sea settings, the discovery of the episodic occurrence of laminated diatom-rich sediments in the Equatorial Pacific and Southern Ocean provides evidence for massive climate-related biogeochemical excursions tied to abrupt changes in the input, distribution and availability of nutrients in the oceans.
Quaternary geology; algae; annual variations; Arctic region; Atlantic Ocean; biochemistry; Cariaco Basin; Caribbean Sea; Cenozoic; climate change; cores; diatoms; Equatorial Pacific; Greenland; Greenland ice sheet; ice cores; laminations; Leg 146; marine sediments; microfossils; North Atlantic; nutrients; Ocean Drilling Program; ODP Site 893; Pacific Ocean; paleoclimatology; planar bedding structures; Plantae; Quaternary; Santa Barbara Basin; sedimentary structures; sediments; Southern Ocean; upwelling; varves; world ocean;
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