Collaborative Research: Stable Isotope Variability in Precipitation at Low Latitude Sites: An Observational and Modeling Study

合作研究：低纬度地区降水的稳定同位素变化：观测和模拟研究

• 批准号: 9909201
• 负责人: Raymond Bradley
• 金额: $ 25.47万
• 依托单位: University of Massachusetts Amherst
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2000
• 资助国家: 美国
• 起止时间: 2000-02-15 至 2003-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9909201&HistoricalAwards=false
• 关键词: Collaborative; Research; Stable; Isotope; Variability

This proposal is for a study of stable isotopes in precipitation at low latitudes where paleoclimate records from ice cores have recently become available (Andes, Tibet/Himalayas, East Africa). The analysis will be based on the output from versions of the ECHAM4 and NASA-GISS2 GCM's with isotopic tracers. Model simulations for several time periods will be compared to the isotope records from ice cores in the target regions. Climatic data and isotope measurements from ice cores for the last 30 years will help validate the model performance under modern conditions and will be used for calibration purposes. The joint observation and modeling approach will shed new light on the heavily disputed interpretations of stable isotopes in precipitation at low latitudes.

该提案旨在研究低纬度地区降水中的稳定同位素，这些地区最近获得了冰芯的古气候记录（安第斯山脉、西藏/喜马拉雅山、东非）。分析将基于ECHAM 4和NASA-GISS 2 GCM版本的同位素示踪物输出。几个时期的模型模拟将与目标区域冰芯的同位素记录进行比较。过去30年的气候数据和冰芯同位素测量将有助于验证模型在现代条件下的性能，并将用于校准目的。联合观测和建模方法将为低纬度降水中稳定同位素的严重争议解释提供新的线索。