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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：
5444676
负责人：
Professor Dr. Dierk Hebbeln
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/5444676?language=en
关键词：
Decadal centennial scale climate variability

项目摘要

The southern Chilean continental margin... offers unique opportunities to study SouthernHemisphere 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 froma latitudinal transect between 42 and 50°S and an additional core off subtropical Chile fromthe Bay of Mejillones at 23°S. The southern cores are expected to provide high resolutionrecords of continental climate changes, particularly rainfall variability controlled by thesouthern westerly wind belt. Based on available data from short gravity cores on thecontinental slope between 40 and 44°S, sedimentationsrates should be high enough to recordsubcentennial scale variations. Further south, core locations in or near the Chilean fjords canbe used to reconstruct Holocene and deglacial changes in the extent of the Patagonian icesheet.In addition, we plan to recover a long core from Bay of Mejillones where laminatedsediments are reported from short cores. This subtropical region likely captures climatesignals originating from the Tropical Pacific which will allow to compare high southernlatitude and tropical influences on decadal to centennial-scale climate and ocean variabilityoff Chile

智利南部大陆边缘。为研究全新世和晚冰川时期南半球十年至百年时间尺度的古环境变化提供了独特的机会。我们建议在42°至50°S的纬度断面上回收4个卡利普索活塞芯，并在南纬23°的梅吉隆斯湾附近的智利亚热带海域恢复一个新的柱芯。南部柱芯有望提供大陆气候变化的高分辨率记录，特别是受西南西风带控制的降水变率。根据S 40°至44°之间大陆斜坡上短重力岩心的现有资料，沉积速率应该足够高，足以记录近百年的尺度变化。再往南，智利峡湾或附近的岩心位置可以用来重建巴塔哥尼亚冰盖范围的全新世和退冰期变化。此外，我们计划从梅吉洛内湾恢复一个较长的岩心，据报道，那里有来自短岩心的层状沉积物。这个亚热带地区可能捕捉到了来自热带太平洋的气候信号，这将使我们能够比较高南纬和热带对智利十年至百年尺度气候和海洋变化的影响