Lake Nicaragua: A Possible High Resolution Record of Tropical Climate

尼加拉瓜湖：热带气候的可能高分辨率记录

• 批准号: 9711788
• 负责人: Theodore Moore
• 金额: $ 3.05万
• 依托单位: Regents of the University of Michigan - Ann Arbor
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1997
• 资助国家: 美国
• 起止时间: 1997-05-01 至 1999-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9711788&HistoricalAwards=false
• 关键词: Lake; Nicaragua; Possible; Resolution; Record

Abstract ATM-9711788 Moore, Theodore University of Michigan Title: Lake Nicaragua: A Possible High Resolution Record of Tropical Climate This SGER award supports a study designed to establish the paleoclimate potential of Lake Nicaragua. Located at approximately 12oN in the heart of the northeast trade wind belt, Lake Nicaragua appears to offer a very promising target for paleoclimate studies. It is the largest single lake in the Americas between Lake Titicaca at about 16oS and the Great Salt Lake at about 41oN. Rainfall in the area is highly seasonal and the climate of the area is strongly affected by the ENSO cycle. The location and size of the lake is ideal for recording regional variations in climate driven by changes in the ENSO tropical cycle in temperature and rainfall. Paleoclimate records from this lake could form an important tie point along the PEP I transect (The Americas) proposed by PAGES (the international Past Global Changes Program, a core project of the International Geosphere-Biosphere Program). Little work has been done on the sediments from Lake Nicaragua and it is possible that the stratigraphic record may be disturbed by tectonic activity or strongly reworked and mixed in the shallower areas by storms. However, the high organic content of the surface sediments and the presence of at least some deeps reaching 40 m offer substantial hope that a very useful paleoclimate record can be recovered.

摘要ATM-9711788摩尔，密歇根大学西奥多分校标题：尼加拉瓜湖：热带气候的可能高分辨率记录这一SGER奖支持一项旨在确定尼加拉瓜湖古气候潜力的研究。尼加拉瓜湖位于东北信风带中心，位于北纬120度左右，似乎为古气候研究提供了一个非常有希望的目标。它是美洲最大的单一湖泊，位于南纬16摄氏度的喀喀湖和北纬41摄氏度的大盐湖之间。该地区的降雨量具有很强的季节性，该地区的气候受到ENSO循环的强烈影响。该湖的位置和大小非常适合记录受ENSO热带循环温度和降雨量变化驱动的区域气候变化。来自该湖的古气候记录可能会形成PEP I样带(美洲)的一个重要连接点，PEPS(国际过去全球变化计划，国际地圈-生物圈计划的核心项目)提出了这一点。对来自尼加拉瓜湖的沉积物所做的工作很少，可能是地层记录受到构造活动的干扰，或者在较浅的地区被风暴强烈地改造和混合。然而，表层沉积物的高有机含量以及至少一些深达40米的深度的存在，为恢复非常有用的古气候记录提供了很大的希望。