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Summer sea-surface temperatures and climate events on the North Icelandic shelf through the last 3000 years

查看全文 作　　者：JIANG [1]Hui;REN [1]Jian;Karen Luise [2]KNUDSEN;Jon [3]EIRiKSSON;RAN [1]LiHua 高影响力作者 机构地区：[1]Key Laboratory of Geographic Information Science, East China Normal University, Shanghai 200062, China;[2]Department of Earth Sciences, University of Aarhus, DK-8000 Arhus C, Denmark;[3]Earth Science Institute, University of Iceland, Askja, IS-101 Reykjavfk, Iceland高影响力机构 出　　处：《Chinese Science Bulletin》索引2007年第52卷第6期,共8页高影响力期刊 基　　金：Supported by the National Natural Science Foundation of China (Grant No. 40276013);Icelandic and Danish Natural Science Research Councils 摘　　要：Diatom data from core MD992271 on the North Icelandic shelf record a cooling trend through the last 3000 years. This is indicated by a general decrease in warm water species and an increase in cold water taxa. The relative abundance of these two diatom groups changed periodically, suggesting that the climate also fluctuated within this time period. The results of diatom-based transfer function calculation show that the summer sea-surface temperatures (SSTs) before 1400 cal. a BP were generally higher than the mean value for the last 3000 years and the summer SSTs fluctuated around the mean between 1400 and 700 cal. a BP, and dropped to the values below the mean after 700 cal. a BP. Four cooling events were distinguished, centered at around 2600, 1900, 1300 and 600 cal. a BP respectively. The results are not only consistent with the data from neighbouring cores HM107-03 and MD992275, but also comparable with those from the GISP2 ice core and from other marine sediment records in the North Atlantic. This suggests that changes in the summer SSTs reflect regional climate variations in the North Atlantic. On the North Icelandic shelf, the summer SST variation is a result of changes in the in-teraction between the cold and the warm currents in the area. 关 键 词：夏季海面温度 气候事件 冰岛北部大陆架 晚全新世
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