The Little Ice Age and Medieval warm period in the Sargasso Sea
作者： L. D. Keigwin
DOI: 10.1126/SCIENCE.274.5292.1504
关键词: Global warming 、 Sea surface temperature 、 Quaternary 、 Oceanography 、 Paleoclimatology 、 Pleistocene 、 Terrigenous sediment 、 Geology 、 Holocene 、 Cenozoic
摘要: Sea surface temperature (SST), salinity, and flux of terrigenous material oscillated on millennial time scales in the Pleistocene North Atlantic, but there are few records Holocene variability. Because high rates sediment accumulation, oscillations well documented northern Sargasso Sea. Results from a radiocarbondated box core show that SST was {approximately} 1{degree}C cooler than today 400 years ago (the Little Ice Age) 1700 ago, warmer 1000 Medieval Warm Period). Thus, at least some warming since Age appears to be part natural oscillation. 39 refs., 4 figs., 1 tab.
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Enno Hartmann, Tom A. Rapoport, Siegfried Prehn, Signal sequence identified. Nature. ,vol. 358, pp. 198- 198 ,(1992) , 10.1038/358198A0
S. C. Porter, G. H. Denton, Chronology of neoglaciation in the North American Cordillera American Journal of Science. ,vol. 265, pp. 177- 210 ,(1967) , 10.2475/AJS.265.3.177
P. D. Jones, T. M. L. Wigley, P. B. Wright, Global temperature variations between 1861 and 1984 Nature. ,vol. 322, pp. 430- 434 ,(1986) , 10.1038/322430A0
M. R. TALBOT, G. DELIBRIAS, Holocene variations in the level of Lake Bosumtwi, Ghana Nature. ,vol. 268, pp. 722- 724 ,(1977) , 10.1038/268722A0
William J. Schmitz, Michael S. McCartney, On the North Atlantic Circulation Reviews of Geophysics. ,vol. 31, pp. 29- 49 ,(1993) , 10.1029/92RG02583
Michael P Bacon, John N Rosholt, Accumulation rates of Th-230, Pa-231, and some transition metals on the Bermuda Rise Geochimica et Cosmochimica Acta. ,vol. 46, pp. 651- 666 ,(1982) , 10.1016/0016-7037(82)90166-1
Edward A. Boyle, Lloyd Keigwin, North Atlantic thermohaline circulation during the past 20,000 years linked to high-latitude surface temperature Nature. ,vol. 330, pp. 35- 40 ,(1987) , 10.1038/330035A0
L. D. Keigwin, G. A. Jones, Western North Atlantic evidence for millennial-scale changes in ocean circulation and climate Journal of Geophysical Research. ,vol. 99, pp. 12397- 12410 ,(1994) , 10.1029/94JC00525
E. M. Druffel, Banded Corals: Changes in Oceanic Carbon-14 During the Little Ice Age Science. ,vol. 218, pp. 13- 19 ,(1982) , 10.1126/SCIENCE.218.4567.13
Malcolm K. Hughes, Henry F. Diaz, Was There a ‘Medieval Warm Period’, and if so, Where and When? Climatic Change. ,vol. 26, pp. 109- 142 ,(1994) , 10.1007/BF01092410