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Decadal to centennial-scale climate variability during the Holocene and Late Glacial based on long CALYPSO cores off southern and subtropical Chile

基于智利南部和亚热带地区长 CALYPSO 核心的全新世和晚冰期期间十年至百年尺度的气候变化

基本信息

批准号：
5444670
负责人：
Dr. Frank Lamy
金额：
--
依托单位：
Präsident
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2005
资助国家：
德国
起止时间：
2004-12-31 至 2010-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/5444670?language=en
关键词：
Decadal centennial scale climate variability

项目摘要

The southern Chilean continental margin... offers unique opportunities to study Southern Hemisphere paleoenvironmental changes during the Holocene and the late glacial on short, decadal to centennial time-scales. We propose to recover 4 long CALYPSO piston cores from a latitudinal transect between 42 and 50°S and an additional core off subtropical Chile from the Bay of Mejillones at 23°S. The southern cores are expected to provide high resolution records of continental climate changes, particularly rainfall variability controlled by the southern westerly wind belt. Based on available data from short gravity cores on the continental slope between 40 and 44°S, sedimentationsrates should be high enough to record subcentennial scale variations. Further south, core locations in or near the Chilean fjords can be used to reconstruct Holocene and deglacial changes in the extent of the Patagonian ice-sheet. In addition, we plan to recover a long core from Bay of Mejillones where laminated sediments are reported from short cores. This subtropical region likely captures climate signals originating from the Tropical Pacific which will allow to compare high southern latitude and tropical influences on decadal to centennial-scale climate and ocean variability off Chile.

智利南部大陆边缘...为研究全新世和晚冰期期间的南半球古环境变化提供了独特的机会，可以在十年到百年的时间尺度上进行研究。我们建议从南纬 42° 至 50° 之间的纬度横断面回收 4 个长 CALYPSO 活塞核心，并从南纬 23° 的梅希约内斯湾在智利亚热带海域回收另一个核心。南部核心预计将提供大陆气候变化的高分辨率记录，特别是受南西风带控制的降雨变化。根据南纬 40° 至 44° 大陆坡短重力核心的现有数据，沉积速率应该足够高，足以记录亚百年尺度的变化。再往南，智利峡湾内或附近的核心位置可用于重建全新世和巴塔哥尼亚冰盖范围的冰消期变化。此外，我们计划从梅希约内斯湾回收一个长岩心，据报道，短岩心有层状沉积物。该亚热带地区可能捕获来自热带太平洋的气候信号，这将有助于比较南高纬度和热带对智利附近十年至百年尺度气候和海洋变化的影响。