P2C2: Synoptic Dendroclimatology--Using Tree Rings to Reconstruct the Driving Forces of Hydroclimatic Variability in the Western United States

P2C2：天气树气候学——利用树木年轮重建美国西部水文气候变化的驱动力

• 批准号: 1102757
• 负责人: Erika Wise
• 金额: $ 25.13万
• 依托单位: University of North Carolina at Chapel Hill
• 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: 2011-07-01 至 2015-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1102757&HistoricalAwards=false
• 关键词: P2C2; Synoptic; Dendroclimatology; Using; Tree

The researcher will examine western U.S. hydroclimatic variability and its relationship to El Nino/Southern Oscillation (ENSO) using synoptic dendroclimatology. Synoptic dendroclimatology integrates synoptic climatology and dendrochronology in a process-based approach linking large-scale circulation patterns to local tree-growth anomalies. The researcher contends that it has been difficult to apply existing ENSO reconstructions to assess ENSO impacts in extratropical regions due to the instability of the impact pattern and the influence of other atmospheric controls on climate patterns in the U.S. west.There are three main objectives of the research: 1) develop a long-term record of atmospheric pressure patterns using existing tree-ring chronologies and gridded reanalysis data; 2) determine controls on persistent meridional and zonal atmospheric flow regimes using targeted field sampling and synoptic analysis; and 3) delineate the spatial footprint of past ENSO events by tying together data from the first two objectives with existing reconstructions of drought and ENSO.The broader impacts include supporting a new female investigator early in her career, the education and training of a graduate student, and the inclusion of a number of undergraduates in field and lab research. The work would be relevant for water managers and others interested in the hydroclimate of the Western U.S. while the gridded pressure reconstruction would be of value to other climate researchers.

研究人员将利用天气树木气候学研究美国西部的水文气候变化及其与厄尔尼诺/南方涛动（ENSO）的关系。天气树木气候学综合了天气气候学和树木年代学，以一种基于过程的方法将大尺度环流模式与局部树木生长异常联系起来。研究人员认为，由于影响模式的不稳定性和其他大气控制对美国西部气候模式的影响，很难应用现有的ENSO重建来评估ENSO对温带地区的影响。该研究有三个主要目标：1)利用现有的树木年轮年表和网格化再分析数据建立大气压力模式的长期记录；2)利用有针对性的野外采样和天气学分析确定对持续的经向和纬向大气流动状态的控制；3)通过将前两个目标的数据与现有的干旱和ENSO重建数据联系起来，描绘出过去ENSO事件的空间足迹。更广泛的影响包括支持一名新的女性研究者在她的职业生涯早期，研究生的教育和培训，以及将一些本科生纳入实地和实验室研究。这项工作将与水资源管理者和其他对美国西部水文气候感兴趣的人有关，而网格压力重建将对其他气候研究人员有价值。