江汉平原江陵地区近9 ka b．p．以来的气候演化：有机碳同位素记录

通过对江陵剖面沉积物的高密度采样和有机碳同位素分析,重建了江汉平原江陵地区近9.0kaB.P.以来的古气候古环境演化。江汉平原江陵地区9.0～6.31kaB.P.属相对温暖湿润的气候环境,晚期向干旱方向发展;6.31～4.97kaB.P.为冷干气候环境,在5.78kaB.P.达到极盛;4.97～2.50kaB.P.为暖湿气候时期,其间3.44～2.50kaB.P.湖沼泥炭发育,3360aB.P.、3110aB.P.、2935aB.P.和2710aB.P.为明显的降温期,尤以2710aB.P.的降温幅度最大;2.50kaB.P.以来温度相对较低,为冷期。江陵地区近9kaB.P.以来的气候变化与国内相邻区域的研究资料相一致,但又有区域的差异性。

Climatic change over the past 9 ka in the Jiangling area, Jianghan plain: Records of organic carbon isotopes

On the basis of the high-density sampling and organic carbon isotope analysis, combined with the grain size and lithologic studies, the paleoclimatic and paleoenvironmental evolution in the Jiangling area of the Jianghan plain during the past 9 ka is reconstructed. There was a relatively warm and wet climatic environment at about 9.0-6.31 ka , which tended to be dry at the late stage;a cold and dry climatic environment occurred at 6.31-4.97 ka , which reached a culmination at 5.78 ka;the climatic environment again became warm and wet at 4.97-2.50 ka , during which limnic peat was developed at 3.44-2.50 ka;marked temperature lowering at 3.36, 3.11, 2.93 and 2.71 ka is recorded;the temperatures have been relatively low since 2.50 ka, representing a cold epoch. The climatic changes in the Jiangling area over the past 9 ka are coincident with the research information from domestic in the neighboring areas but also show regional difference.