P2C2: A Network of Paleo-Monsoon Rainfall Stations in Southeast Asia to Investigate Atmospheric Circulation Changes over the Past Four Centuries

P2C2：东南亚古季风降雨站网络，用于调查过去四个世纪的大气环流变化

• 批准号: 0902507
• 负责人: Lowell Stott
• 金额: $ 40.46万
• 依托单位: University of Southern California
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-08-15 至 2011-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0902507&HistoricalAwards=false
• 关键词: P2C2; Network; Paleo; Monsoon; Rainfall

Funding is provided to support the development and calibration of a method for reconstructing rainwater delta Oxygen-18 from cellulose extracted from the annual rings of trees that grow throughout Thailand. The researchers will measure delta Oxygen-18 tree cellulose from Khasi pine and Merkus pine trees as a means to reconstruct annual to subannual records of atmospheric precipitation at sites across Southeast (SE) Asia. The researchers hypothesize that the increased moisture from the Indian Ocean is a response to the expansion of the continental monsoon trough eastward over SE Asia. To test this hypothesis, the researchers will extend the data base of Pine delta Oxygen-18 to sites across SE Asia in order to map the spatial pattern of precipitation delta Oxygen-18 variability.The project offers the promise of helping opening tropical tree-rings to climate analysis. This is important because, at present, tropical tree cannot be used as a reliable paleoclimate archive because they do not lay down visible seasonal tree rings as do higher latitude specimens. Developing an isotopic technique for tropical trees would be a transformative breakthrough in climate analysis.

提供资金，以支持开发和校准一种方法，从泰国各地树木的年轮中提取纤维素，重建雨水三角洲氧-18。研究人员将测量来自卡西松树和梅克斯松树的三角洲氧-18树纤维素，作为重建东南亚地区大气降水年度至亚年度记录的一种手段。研究人员假设，印度洋的水分增加是对东南亚大陆季风槽向东扩张的反应。为了验证这一假设，研究人员将把松三角洲氧-18的数据库扩展到东南亚各地，以绘制降水三角洲氧-18变化的空间模式。该项目有望帮助打开热带树木年轮的气候分析。这一点很重要，因为目前，热带树木不能作为可靠的古气候档案，因为它们不像高纬度标本那样留下可见的季节性树木年轮。 为热带树木开发同位素技术将是气候分析的一个变革性突破。