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: 2303524
• 负责人: Laia Andreu-Hayles
• 金额: $ 56.23万
• 依托单位: Columbia University
• 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=2303524&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.

该项目特别寻求使用在危地马拉、洪都拉斯、厄瓜多尔、秘鲁、玻利维亚和智利树木年轮纤维素中测得的稳定氧同位素（δ 18 O），重建新热带地区至少过去200年的雨季降水变化，以收集关于大规模热带气候动态的见解。研究的总体目标是了解热带辐合带（ITCZ）位置和宽度的近期和未来潜在变化，以及这些变化如何与全球气候变率模式联系在一起，并可能影响北方（NH）和南方（SH）的热带降雨模式。使用树木纤维素同位素的研究策略的合理性在于，热带地区树木年轮记录相对较少，（一个大的地理区域和广泛的生态系统）妨碍了对气候变率范围的更全面的了解，特别是在十年至百年时间尺度上和对辐射强迫变化的反应。现代观测、试点研究、和世界其他地方的古气候数据。潜在的更广泛的影响包括支持博士后研究人员以及参与研究的研究生和与国际研究人员的广泛互动。该奖项反映了NSF的法定使命，并通过使用基金会的智力价值和更广泛的评估被认为值得支持。影响审查标准。