Collaborative Research: Intertropical Convergence Zone Variations from Stable Oxygen Isotope Tree-ring Records in the Tropical Americas

合作研究：热带美洲稳定氧同位素树轮记录的热带辐合带变化

• 批准号: 2303526
• 负责人: Diego Pons Ganddini
• 金额: $ 3万
• 依托单位: University of Denver
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2024
• 资助国家: 美国
• 起止时间: 2024-02-01 至 2027-01-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2303526&HistoricalAwards=false
• 关键词: Collaborative; Research; Intertropical; Convergence; Zone

This project specifically seeks to use stable oxygen isotopes (δ18O) measured in cellulose from the annual growth rings of trees located in Guatemala, Honduras, Ecuador, Peru, Bolivia and Chile to reconstruct wet season precipitation variability for at least the last 200 years across the neotropics to glean insights on large-scale tropical climate dynamics. The general goal of the research is to understand recent and potential future changes in the position and width of the Intertropical Convergence Zone (ITCZ) and how these changes may be tied to global modes of climate variability and could affect patterns of tropical rainfall in both the northern (NH) and southern (SH) hemispheres.The rational for the research strategy of using isotopes from tree cellulose is that the relative paucity of tree-ring records in tropical regions (a large geographic area and extensive ecosystem) prevents a more comprehensive understanding of the range of climate variability particularly at decadal to centennial time scales and in response to changes in radiative forcing. Such data are otherwise unavailable from modern observations, pilot studies, and paleoclimate data elsewhere in the world.The potential Broader Impacts include support for a postdoctoral researcher as well as graduate undergraduate students involved in the research and extensive interaction with international researchers.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

This project specifically seeks to use stable oxygen isotopes (δ18O) measured in cellulose from the annual growth rings of trees located in Guatemala, Honduras, Ecuador, Peru, Bolivia and Chile to reconstruct wet season precipitation variability for at least the last 200 years across the neotropics to glean insights on large-scale tropical climate dynamics.这项研究的一般目标是了解跨热带收敛区（ITCZ）的位置和宽度的最新和潜在的未来变化，以及这些变化如何与气候变异性的全球模式相关联，并可能影响北部（NH）和南部（SH）半球的热带降雨模式。使用Isopope的研究策略是属于树木的研究策略。区域（一个较大的地理区域和广泛的生态系统）可以防止对气候变异性范围的更全面的了解，尤其是在十年纪念日的年代范围内，并且响应辐射强迫的变化。这些数据否则无法获得世界其他地方其他地方的现代观察结果和古气候数据。潜在的广泛影响包括对博士后研究人员以及参与研究的研究生本科生的支持以及与国际研究人员进行的广泛互动的支持。这一奖项反映了NSF的法规和审查的范围，以反映了构成构成者的范围，这是由构成的范围构成的，其构成者被认为是构成的。