QUANTITATIVE RECONSTRUCTION OF PALAEOCLIMATE SINCE 200 kaBP IN TANGSHAN AREA,HEBEI PROVINCE
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摘要: 根据唐山市复兴路十中旧址(TZC6-7)钻孔岩心中的孢粉分析资料,运用宋长青等提出的花粉-气候因子转换函数方法,定量重建了唐山地区近20万年来的年均温度和年均降水量。结果表明,重建的年均温度和年均降水量变化的阶段性和周期性清晰,其趋势基本符合我国华北地区晚第四纪以来的气候变化框架,但具体数值与古气候参数绝对值之间可能存在一定的误差。总体来看,唐山地区20万年以来共经历了11个不同的气候阶段,其中可以比较确切识别的是:120~90 kaBP (50.5~43.5 m)和40~30 kaBP (22.4~18.8 m)的两次暖期,70~40 kaBP (29.5~22.4 m)、30~20 kaBP (18.8~14.2 m)和20~11 kaBP (14.2~4.4 m)的3次冷期,以及发生在80 kaBP (41.5 m)左右的降温事件。
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关键词:
- 花粉-气候因子转换函数 /
- 古气候定量重建 /
- 第四纪 /
- 唐山地区
Abstract: Annual mean temperature and precipitation in Tangshan area since 200 kaBP are reconstructed quantitatively in this paper by means of the transfer function of pollen-climatic factors proposed by Song Changqing, based on the pollen data of the Hole TZC6-7 at the former site of the 10th Middle School,Tangshan city.The results show a clear periodical and cyclic variation pattern in annual mean temperature and precipitation, which can be well correlated with the climatic changes in Huabei area since the late Quaternary, although there may be some deviation between the data we obtained and the absolute values of the palaeoclimatic parameters.11 climatic stages were recognized in Tangshan area since 200 kaBP. There are two warm periods in 120~90 kaBP(50.5~43.5 m) and 40~30 kaBP(22.4~18.8 m) and three cold periods in 70~40ka BP(29.5~22.4 m),30~20 kaBP(18.8~14.2 m) and 20~11 kaBP(14.2~4.4 m)respectively.A cooling event is discovered at about 80ka BP. -
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