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冰川冻土  2005 

3.2kaBP以来念青唐古拉山东部则普冰川波动与环境变化

, PP. 74-79

Keywords: 3.2ka,则普冰川,环境变化,念青唐古拉山

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Abstract:

基于野外考察和14C年代测定,确定了3.2kaBP以来念青唐古拉山东部则普冰川的冰进序列.新冰期冰进可明显分为3次即大拿[14C(3242±101)aBP]、大拿顶[14C(1920±110)~(1540±85)aBP]和白同[14C(105±115)aBP]冰进.新冰期盛时,则普冰川比现代长6.9km,面积大17.10km2,雪线降低约157m,温度降低1.0~1.9℃.小冰期可分出2次即15世纪或1世纪[14C(580±130)aBP]和19世纪[14C(197±80)aBP,(190±80)aBP]冰进.小冰期盛时,则普冰川比现代长2.0km,面积大11.1km2,雪线降低约100m,温度降低0.5~1.23℃.现代则普冰川,冰面表碛特别发育,其厚度亦很大,冰舌末端退缩难以辨认.但冰川减薄很强烈,边缘两侧形成2~3道现代侧碛,并高出现代冰面20~30m.对埋藏腐殖质土壤层和木炭碎屑经14C年代测定,结果表明在(720±210)~(2010±120)aBP间,波堆藏布流域存在砍伐森林、开垦田地和放牧的人类活动.

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