Widespread evidence of 1500 yr climate variability in North America during the past 14 000 yr
Widespread evidence of 1500 yr climate variability in North America during the past 14 000 yr
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过去 14 000 年间北美 1500 年气候变化的广泛证据
DOI：
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发表时间：
2002
期刊：
影响因子：
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通讯作者：
M. Sawada
中科院分区：
文献类型：
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作者：
A. Viau;K. Gajewski;P. Finès;David E. Atkinson;M. Sawada
关于最近确定的1500年气候振荡的空间范围和幅度存在争论。现有的证据主要局限于北大西洋和邻近的陆地。这些气候变化在全新世陆地环境中的空间范围、幅度和影响尚未确定。结果表明，在过去的14000历年（cal年）中，千年尺度的气候变率导致了整个北美植被群落的变化，其周期为1650±500年。花粉记录的主要转变发生在600、1650、2850、4030、6700、8100、10 190、12 900和13 800 calyr b.p.，与冰和海洋记录一致。我们认为北大西洋千年尺度的气候变率与大气环流的重新安排有关，对气候有深远的影响。
There is debate concerning the spatial extent and magnitude of the recently identified 1500 yr climate oscillation. Existing evidence is largely restricted to the North Atlantic and adjacent landmasses. The spatial extent, magnitude, and effects of these climate variations within the terrestrial environment during the Holocene have not been established. We show that millennial-scale climate variability caused changes in vegetation communities across all of North America with a periodicity of 1650 ± 500 yr during the past 14 000 calendar years (cal yr). Times of major transitions identified in pollen records occurred at 600, 1650, 2850, 4030, 6700, 8100, 10 190, 12 900, and 13 800 cal yr B.P., consistent with ice and marine records. We suggest that North Atlantic millennial-scale climate variability is associated with rearrangements of the atmospheric circulation with far-reaching influences on the climate.