Varved Records of Decade- to Century-Scale Climate Variability in the Tropical Atlantic Sector

这一奖项是为了分析博苏姆特维湖的沉积物，以产生3000年前西非热带水文变化的十年分辨率记录。此外，还将产生第一个在10,000到25,000年间大气放射性碳变化的热带记录。以前的野外工作已经在博苏姆特维湖获得了大约25,000年前的层状岩芯材料。将从这些沉积物中分析各种气候指标，以产生古水文时间序列。来自陆地植物的木炭将从不同的层进行测年，以生成用于辐射测年的D14C校准曲线。干旱发生的时间和干旱对该区域(西非)的自然变异性很重要。更好地了解该区域的水文历史如何与其他区域的类似记录相联系，将促进我们对气候系统的全面了解，并使我们能够回答有关低纬度和高纬度之间的相互关系以及海洋和陆地气候相互作用的许多问题。冰期到非冰期大气放射性碳变化的真实形态将是放射性碳测年的重要进展。

This award is to analyze sediments from Lake Bosumtwi to generate a record of tropical West African hydrologic variability back to 3000 years with decadal resolution. In addition, the first tropical record of atmospheric radiocarbon change between 10,000 and 25,000 years will be produced.Previous field work has secured laminated core material back to about 25,000 years at Lake Bosumtwi. A variety of proxy indicators of climate will be analyzed from these sediments to produce a paleohydrologic time series. Charcoal from terrestrial plants will be dated from the varved layers to generate a D14C calibration curve for radiometric dating. The timing of droughts and the natural variability of droughts to this region (West Africa) are important. Better understanding of how the hydrologic history of the region relates to similar records from other regions will advance our overall knowledge of the climate system and allow us to answer many questions regarding interrelationships between low and high latitude and marine and terrestrial climate interactions. The true shape of the atmospheric radiocarbon variation during glacial to deglacial times will be an important advancement for radiocarbon dating.