CLIMATIC AND ENVIRONMENTAL CHANGES OVER THE PAST 450 YEARS RECORDED IN ELSON LAGOON AT BARROW,ALASKAN ARCTIC
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摘要: 北极阿拉斯加巴罗地区Elson湖长60cmAB-67钻孔岩芯提供了过去450年连续的高分辨环境变化记录。综合分析210Pb测年、沉积物粒度、有机质、化学元素和微体古生物化石等资料，一致反映出巴罗地区过去450年的气候、环境变化过程存在如下3个阶段：1）大约1540～1740年，为低海面寒冷时期；2）1740～1827年，为气候转暖-海侵过渡时期；3）1827年至今，为继续海侵-气候波动变暖时期。其中1800年前后和1940年前后，气温较高。1921～1993年巴罗的气温记录说明，北极地区气温不仅有明显的10a和60a周期变化，而且年平均温度变幅极大，达4.5℃。显示极地气候变化特别强烈并不反映大幅度升温。近20年来的变暖趋势是1827年以来自然的气候波动变暖的继续。Abstract: Under cooperative arrangement between Chinese Academy of Sciences and the North Slope Borough, Alaska, Zhang Qingsong and Hou Shugui, two of the authors of this paper made a four-week field investigation at Barrow from August to September, 1994. Barrow is located in the northeast of Alaskan coastal plain (71 ° 20′ N, 156°40′W), which is encircled by the Chukchi Sea in the west and the Beaufort Sea in the north. Thus, it is considered to be a key region for studying the land-ocean interaction related to climatic and environmental changes.Oimatically, Barrow is a quite cold area with the annual mean temperature of-12.4℃ and the mean winter and summer temperatures ranges between-29℃ and 2℃. Annual mean precipitation is less than 250 mm /a.
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