极地研究 ›› 1998, Vol. 10 ›› Issue (4): 15-24.

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北极巴罗苔原区湖泊沉积的地球化学特征及其气候意义

杨惟理;张青松   

  • 出版日期:1998-12-30 发布日期:1998-12-30

GEOCHEMICAL CHARACTERISTICS AND ITS CLIMATIC SIGNIFICANCE IN THE BORECORE AB 32 FROM IKROAVIK LAKE IN THE TUNDRA BARROW,ARCTIC ALASKA

  • Online:1998-12-30 Published:1998-12-30

摘要:

应用地球化学元素、地球化学淋溶系数及环境温度指标,研究了北极阿拉斯加巴罗热融湖Ikroavik钻孔岩芯AB-32连续的高分辨环境记录。结合210Pb测年数据,指出巴罗地区气候、环境变化的历史状况是:1600~1735年为寒冷、干燥时期;1750~1830年,气候变暖、变湿;1830年出现明显的地球化学转折界限,1830~1994年,气候较湿润温暖。1969~1970年前后,巴罗地区有一变冷阶段。AB-32钻孔岩芯1830年左右表现的古地球化学特征与现代Ikroavik湖泊环境地球化学特征相吻合,并且和Elson泻湖AB-67沉积岩芯反映的气候环境变化基本一致。

关键词: 北极,Ikroavik湖,地球化学,气候

Abstract:

Paleoenvironmental record in the AB 32 sediment core from Ikroavik Lake in Barrow,Arctic Alaska was studied with geochemical assemblages,leaching factors and paleotemperature indicators. According to the geochemical characteristics of the borecore AB 32 and 210 Pb dating,climatic and environmental changes in Barrow,Alaska reconstructed are as follows:1) from 1600 to 1735 AD,it was a period of cold and dry; 2) from 1735 to 1830 AD,it was becoming warm and moist; 3) around 1830 AD,it was obviously with a demarcation of geochemical significance;1830-1994 AD,it was continuous more warm and moist,but appeared cold period around 1969-1970 AD. The paleogeochemical characteristics in AB 32 borecore around 1830 AD are similar with those of modern environment in Ikroavik lake and response to climatic and environmental changes reflected in the borecore AB 67 from Elson lagoon.