P2C2: Northern and Southern Low-Latitude Precipitation Histories--Testing Ideas about Millennial and Orbital-Scale Climate Change

P2C2：南北低纬度降水历史——检验千年和轨道尺度气候变化的想法

• 批准号: 1103403
• 负责人: Richard Edwards
• 金额: $ 55.8万
• 依托单位: University of Minnesota-Twin Cities
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2011
• 资助国家: 美国
• 起止时间: 2011-06-01 至 2016-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1103403&HistoricalAwards=false
• 关键词: P2C2; Northern; Southern; Low; Latitude

This research team seeks to extend absolute-dated records of the oxygen isotopic composition of speleothem calcite from the Northern Hemisphere (southeast Asia) and from Southern Hemisphere (South America) low latitude sites. For each of these regions, the investigators aim to: (i) extend the records deeper in time; (ii) broaden the geographic coverage within the region; (iii) increase the oxygen isotope resolution within key time ranges; and (iv) apply newly developed dating techniques to refine and extend chronologies. For the northern site, the team plans to extend the record an additional three glacial-interglacial cycles back to about 650,000 years ago and also establish a record in the mid-Quaternary (1.3 to 1.5 million years ago). For the southern site, the researchers seek to develop a record covering the last few glacial-interglacial cycles.With these new records, the principal investigators will test hypotheses related to: (1) the causes of millennial-scale climate change; (2) the causes of ice age terminations; (3) the mechanisms for long-term monsoon variability; and (4) the controls on the oxygen isotopic composition of rainfall in regions affected by monsoon rainfall.A better understanding of the temporal and spatial variability of precipitation over low latitude sites would be of great scientific value to the wider science community. Through this project, the researchers will continue to develop strong international collaborations with Chinese and Brazilian scientist. The project also supports a post-doctoral scholar.

该研究小组试图扩展来自北方半球（东南亚）和南半球（南美洲）低纬度地点的洞穴方解石氧同位素组成的绝对定年记录。 对于每一个地区，研究人员的目标是：㈠在时间上更深入地扩展记录; ㈡扩大该地区的地理覆盖范围; ㈢提高关键时间范围内的氧同位素分辨率; ㈣应用新开发的测年技术来完善和扩展年表。对于北方遗址，研究小组计划将记录再延长三次冰川-间冰期循环，追溯到大约65万年前，并在第四纪中期（130万至150万年前）建立一个记录。对于南部的站点，研究人员试图建立一个记录，涵盖最近几次冰期-间冰期循环。通过这些新记录，主要研究人员将测试与以下相关的假设：（1）千年尺度气候变化的原因;（2）冰河时代终止的原因;（3）长期季风变化的机制;（4）气候变化的原因。（4）季风气候对降水氧同位素组成的控制作用。 通过该项目，研究人员将继续与中国和巴西科学家开展强有力的国际合作。 该项目还支持一名博士后学者。