High Resolution ENSO and Other Paleoenvironmental Data for the last 20 ka from Cave Speleothems in Madagascar and Botswana

马达加斯加和博茨瓦纳洞穴洞穴中过去 20 ka 的高分辨率 ENSO 和其他古环境数据

• 批准号: 9908415
• 负责人: George Brook
• 金额: $ 33.58万
• 依托单位: University of Georgia Research Foundation Inc
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1999
• 资助国家: 美国
• 起止时间: 1999-09-15 至 2005-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9908415&HistoricalAwards=false
• 关键词: Resolution; ENSO; Other; Paleoenvironmental; Data

AbstractThis proposal requests support for a high-resolution study of paleoclimate in Africa. Because the climates of northwest Madagascar and Botswana are affected significantly by ENSO events, paleoenvironmental records are also proxy records of SST and El Nino frequency. El Nino events bring above-average rainfall to northwest Madagascar and below-average rainfall to Botswana. Stalagmites from Botswana, ranging up to 57 cm long, can provide a high-resolution record for this area for the last 2000 years. Formations from Madagascar, with one stalagmite almost 3 m long, can provide a high-resolution record possibly to 15-20 ka ago. This proposal requests funds to fully explore the potential of these stalagmites to provide high-resolution regional paleoenvironmental information, and also data on SSTs and ENSO, variations in del-13C, UV-stimulated luminescence of humic and fulvic acids, particulate matter, petrography, layer thickness, inclusion frequency' and gray level along the growth axes of stalagmites will be related to regional rainfall and temperature, ocean SSTs, El Nino frequencies, and Southern Oscillation characteristics.

Abstractthis提案要求支持非洲古气候的高分辨率研究。 由于西北马达加斯加和博茨瓦纳的气候受到ENSO事件的重大影响，因此古环境记录也是SST和El Nino频率的代理记录。 El Nino事件将马达加斯加西北部的降雨量高于平均水平，并向博茨瓦纳（Botswana）带来了低于平均水平的降雨。来自博茨瓦纳的Stalagmites长达57厘米，可以在过去2000年中为该地区提供高分辨率的记录。来自马达加斯加（Madagascar）的地层近3 m长，可以提供高分辨率的记录，可能是15-20 ka。 This proposal requests funds to fully explore the potential of these stalagmites to provide high-resolution regional paleoenvironmental information, and also data on SSTs and ENSO, variations in del-13C, UV-stimulated luminescence of humic and fulvic acids, particulate matter, petrography, layer thickness, inclusion frequency' and gray level along the growth axes of stalagmites will be related to regional rainfall and temperature, ocean SST，El Nino频率和南部振荡特性。