P2C2: High-Resolution Records of Rapid Climate Change in Speleothem Records from the Bahamas

P2C2：巴哈马洞穴记录中气候快速变化的高分辨率记录

• 批准号: 1103489
• 负责人: Peter Swart
• 金额: $ 82.79万
• 依托单位: University of Miami
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2011
• 资助国家: 美国
• 起止时间: 2011-09-15 至 2016-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1103489&HistoricalAwards=false
• 关键词: P2C2; Resolution; Records; Rapid; Climate

This award supports team of researchers to investigate the hypothesis that aridification in Northern Africa and cooling in the North Atlantic Ocean, associated with Heinrich events, are recorded in the chemical composition of stalagmites from the Bahamas during periods of low sea level.The team's science strategy is to combine geochemical analysis of speleothems with regional modeling in order to gain a better understanding of the signatures and physical mechanisms of rapid climate change in the tropical/sub-tropical Atlantic. The Bahamian stalagmites occur in caves which are now flooded by seawater. The researchers have collected submerged samples from depths up to 35 meters below the present sea level. These stalagmites formed during periods when sea-level was lower than the present time and ceased growing either when sea-level flooded the caves or when climate conditions became arid and there ceased to be sufficient water to support speleothem formation. The speleothems have been preliminarily dated and separated into three age groups of 14,000-80,000 yrs, 200,000-250,000 yrs, and 300,000-350,000 yrs.The broader impacts include outreach activities in the Bahamas, where the researchers will work with local environmental organizations to raise awareness of the effects of sea-level rise. The project also includes support for two graduate students and opportunities for undergraduate students and high school interns to obtain laboratory and research experience.

该奖项支持研究人员团队调查与海因里希事件相关的北方非洲干旱化和北大西洋冷却的假设，在低海平面时期，巴哈马石笋的化学成分中记录了这些特征。该团队的科学策略是将洞穴沉积物的联合收割机地球化学分析与区域建模相结合，以便更好地了解这些特征和物理特征。热带/亚热带大西洋快速气候变化的机制。巴哈马的石笋出现在现在被海水淹没的洞穴中。研究人员从目前海平面以下35米深处收集了水下样本。这些石笋形成于海平面低于现在的时期，当海平面淹没洞穴或气候条件变得干旱，不再有足够的水来支持洞穴形成时，石笋停止生长。这些洞穴沉积物已被初步确定年代，并分为三个年龄组，分别为14，000 - 80，000年、200，000 - 250，000年和300，000 - 350，000年。更广泛的影响包括在巴哈马群岛的外联活动，研究人员将与当地环保组织合作，提高人们对海平面上升影响的认识。 该项目还包括为两名研究生提供支助，并为本科生和高中实习生提供获得实验室和研究经验的机会。

项目成果

Bahamian speleothem reveals temperature decrease associated with Heinrich stadials

• DOI: 10.1016/j.epsl.2015.08.035
• 发表时间: 2015-11-15
• 期刊: EARTH AND PLANETARY SCIENCE LETTERS
• 影响因子: 5.3
• 作者: Arienzo, Monica M.;Swart, Peter K.;Kakuk, Brian
• 通讯作者: Kakuk, Brian