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

• 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

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...为研究全新世和冰期晚期的南半球古环境变化提供了独特的机会，我们建议从 42 至 50 纬度横断面恢复 4 个长 CALYPSO 活塞核心。 ° S 和来自南纬 23° 梅希约内斯湾的智利亚热带地区的另一个核心预计将提供较高的温度。大陆气候变化的分辨率记录，特别是由南半球西风带控制的降雨变化，根据南纬40°至44°大陆坡上的短重力核心的现有数据，沉积速率应该足够高，足以记录更南边的亚百年尺度变化。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的短岩芯报告了层状沉积物，该亚热带地区可能捕获了来自热带太平洋的气候信号，这将有助于比较高南纬度和热带对智利近十年至百年尺度气候和海洋变化的影响。