SGER: Tropical Tidal Flat Archive of Global Climate Variations

SGER：全球气候变化热带滩涂档案

• 批准号: 9119340
• 负责人: Robert Ginsburg
• 金额: $ 3.98万
• 依托单位: University of Miami
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1991
• 资助国家: 美国
• 起止时间: 1991-09-01 至 1993-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9119340&HistoricalAwards=false
• 关键词: SGER; Tropical; Tidal; Flat; Archive

This is an SGER (Small Grants for Exploratory Research) award. Tropical tidal flat deposits of the Western Atlantic may contain a unique strip-chart-like record of variations in climate during the past few thousand years. The locally-adhesive surfaces of these flats act like fly-paper to retain aerosols from Africa and centimeter-thick layers of marine sediment record the passage of hurricanes. Both the frequency of hurricanes and the flux of aerosols from Africa reflect global-scale variations in climate. To explore this potential record of climate variations, a series of cores will be collected for sediments that have accumulated continuously for the past 3000 years or more. The sediment layers that record major storms will be logged and their compositions determined; the aerosols will be extracted from the inter-storm algal layers, weighed and their compositions determined by x-ray diffraction and optical microscopy. To date the storm layers and determine rates of accumulation of aerosols, sections of the cores will be dated by radiocarbon and possibly with thorium230. This pilot project may produce a local record of hurricane frequency and the flux of aerosols and by applying the method to other tidal flat deposits, it is possible to develop the record of a much larger area. This exploratory research is important because, if successful, it will provide information of storm frequency under different global climate regimes.

这是SGER（探索性研究的小赠款）奖。 西大西洋的热带潮汐平坦沉积物可能包含过去几千年来气候变化的独特脱衣舞样记录。 这些公寓的局部粘附表面像飞纸一样起作用，可保留非洲的气溶胶和毫米厚的海洋沉积物层记录了飓风的通行。 飓风的频率和来自非洲气溶胶的通量反映了气候中全球规模的变化。 为了探索这种潜在的气候变化记录，将为过去3000年或更长时间以更长时间累积的沉积物收集一系列核心。 记录重大风暴的沉积物层将被记录并确定其成分；气溶胶将从体积间藻类层中提取，并通过X射线衍射和光学显微镜确定其组成。 迄今为止，风暴层并确定气溶胶的积累速率，岩心的部分将由放射性碳和thorium230进行日期。 该试点项目可能会产生飓风频率和气溶胶通量的当地记录，并通过将方法应用于其他潮汐扁平沉积物，可以发展出更大面积的记录。 这项探索性研究很重要，因为如果成功，它将在不同的全球气候制度下提供风暴频率的信息。