东海沉积物中全新世中晚期气候变化的孢粉学证据

Palynological Evidence on Climate Changes in the East China Sea During the Middle and Late Holocene

对东海钻孔进行孢粉分析,恢复了该区全新世中晚期的气候变化历程。分为个气 DGKS9617 6 候期和个亚期。分别与孢粉组合相对应为:Ⅰ暖热湿润期;Ⅱ暖热干燥期,平均温度约比现今高～ 11 -- 2℃;Ⅲ温凉湿润期,分三个亚期,即Ⅲ偏温干亚期,Ⅲ偏暖湿亚期,Ⅲ偏温干亚期;Ⅳ冷干3 - a- b- c--期,三个亚期为Ⅳ偏冷干亚期,年均温度较今约低～℃,Ⅳ偏温湿亚期,Ⅳ偏温干亚期;Ⅴ冷 a- 12 b-c--湿期;Ⅵ温暖干燥为主,分为个相对偏冷或偏暖亚期。-

The pollen analysis of DGKS9617 core in the East China Sea ( covering about the last 6800 years ) shows five obvious pollen assemblages and seven sub-assemblages. Combined with the sediment and the result of diatom analysis, the climate changes are reconstructed during the middle and late Holocene. Corresponding to the pollen assemblages, the climate shifted just as ⅠⅡfollows: Assemblage-Warm and Dry Stage, Assemblage -Cool and Humid Stage, Assemblage Ⅲ℃Ⅳ-Hot and Dry Stage (the mean annual temperature is 2~3 higher than today), Assemblage -ⅤCool and Humid Stage, Assemblage -Warm and Dry Stage. The third stage is divided into three substages as a slight colder and dry one, a slight warmer and humid one and a slight warmer and dry one. During the fifth stage, the climate became similar to that today with the four shifts of the slight warm and the slight cool.