Lake Nicaragua: A Possible High Resolution Record of Tropical Climate

题目：尼加拉瓜湖：可能的高分辨率热带气候记录SGER奖支持一项旨在建立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的中心地带，大约12oN，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，位于的的喀喀湖（约160英里）和大盐湖（约41英里）之间。该地区的降雨具有很强的季节性，该地区的气候受ENSO循环的强烈影响。该湖的位置和大小非常适合记录由ENSO热带循环的温度和降雨变化所驱动的区域气候变化。该湖的古气候记录可以成为国际地圈-生物圈计划核心项目PAGES（国际过去全球变化计划）提出的PEP I样带（美洲）的重要联络点。对尼加拉瓜湖沉积物的研究很少，地层记录可能受到构造活动的干扰，或者在较浅的地区受到风暴的强烈改造和混合。然而，地表沉积物的高有机含量和至少一些深度达到40米的存在，为恢复非常有用的古气候记录提供了很大的希望。

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.