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Neogene herpetofauna, climate, and continental runoff of western Siberia

西西伯利亚新近纪爬行动物、气候和大陆径流

基本信息

批准号：
147416809
负责人：
Professorin Dr. Madelaine Böhme
金额：
--
依托单位：
Institut für Biologie und Umweltwissenschaften (IBU)
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2009
资助国家：
德国
起止时间：
2008-12-31 至 2013-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/147416809?language=en
关键词：
Neogene herpetofauna climate continental runoff

项目摘要

Western Siberia comprises the drainage basin of the major Siberian rivers Irtysh and Ob, both flowing into the Kara Sea of the Arctic Ocean. The annual discharge of both rivers represents more than 20 % of the total Eurasian runoff into the Arctic Ocean. Due to potential freshwater forcing of the Arctic Ocean it is suspected that runoff variations affect ocean circulation and global climate evolution and might have promoted the late Neogene Northern Hemisphere glaciation. However, proxy data are still missing to corroborate this hypothesis. To study the influence of West Siberian runoff on Arctic paleoceanography and to test existing hypothesis about its role for Northern hemisphere glaciation we propose to develop a high-resolution paleo-precipitation database of the last 20 Myrs for West Siberia based on bioclimatic analysis of fossil herpetofauna (amphibians and reptiles). Using this database we are able to calculate Neogene West Siberian continental discharge into the Arctic Ocean. The proposed research will provide extremely valuable proxy-based results for paleoceanography and paleoclimatology. Moreover, by its taxonomicpaleobiologic research it will significantly contribute to the understanding of the evolution and biogeography of cool-temperate amphibians and reptiles of Eurasia

西西伯利亚包括西伯利亚主要河流额尔齐什河和鄂毕河的流域，这两条河流都流入北冰洋的喀拉海。这两条河流的年流量占流入北冰洋的欧亚径流总量的20%以上。由于北冰洋潜在的淡水强迫，推测径流变化影响了海洋环流和全球气候演变，并可能促进了新近纪晚期北半球冰川的形成。然而，仍缺乏代理数据来证实这一假设。为了研究西西伯利亚径流对北极古海洋学的影响，并检验关于径流对北半球冰川作用的现有假说，我们建议在对两栖和爬行动物化石的生物气候分析的基础上，建立西西伯利亚近20年来的高分辨率古降水数据库。利用这个数据库，我们能够计算新近系西西伯利亚大陆流入北冰洋的流量。这项拟议的研究将为古海洋学和古气候学提供非常有价值的替代结果。此外，通过它的分类和古生物学研究，将对了解欧亚大陆冷温带两栖和爬行动物的进化和生物地理做出重要贡献。