High-Resolution Younger Dryas Environmental Variability: A Comprehensive Assessment from Mid-North America Tree Rings

高分辨率新仙女木环境变异：对北美中部树木年轮的综合评估

• 批准号: 0213696
• 负责人: Irina Panyushkina
• 金额: $ 24.42万
• 依托单位: University of Arizona
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2002
• 资助国家: 美国
• 起止时间: 2002-08-01 至 2006-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0213696&HistoricalAwards=false
• 关键词: Resolution; Younger; Dryas; Environmental; Variability

The goal of this award is to develop a high-resolution portrait of the Late Glacial-Early Holocene transition in middle North America using data from tree-rings. In this study, the environmental changes in middle North America will be investigated over several millennia (ca. 10,000 to 14,000 years ago) during the Late Glacial-Early Holocene transition, including the Younger Dryas (YD) interval. The warming from the Late Glacial to the Early Holocene was interrupted by an abrupt, millennial-length, cold climate excursion known as the YD event. The environmental effects of this climatic event seem to be widespread, but knowledge of the character of the YD in Europe far exceeds that of North America. North America has potential links with the physical mechanisms likely to have triggered the event in the middle North Atlantic Ocean such as shifting glacial meltwater outlets from the land to the ocean. The environmental changes during the YD (i.e., those related to temperature, water-use efficiency, and hydrologic cycle-related parameters of precipitation, relative humidity, and soil saturation) will be measured against those of the time periods immediately before and after, and with modern conditions. The results will improve our understanding of the environmental and faunal changes and responses in middle North America. This will help place such changes in the context of global environmental change during deglaciation.

该奖项的目标是利用树木年轮数据，开发出北美中部晚冰期-全新世早期过渡的高分辨率肖像。在这项研究中，北美中部的环境变化将被调查数千年（约1000年）。10，000至14，000年前）在晚冰期-早全新世过渡期间，包括新仙女木（YD）间隔。从晚冰期到全新世早期的变暖被一个突然的，长达千年的，寒冷的气候漂移所打断，称为YD事件。这一气候事件的环境影响似乎是广泛的，但知识的性质，在欧洲的YD远远超过北美。北美与可能引发北大西洋中部事件的物理机制有潜在联系，例如将冰川融水出口从陆地转移到海洋。青年节期间的环境变化（即，与温度、水利用效率和降水、相对湿度和土壤饱和度等水文循环相关参数有关的参数）将与紧接在此之前和之后的时间段以及现代条件下的参数进行比较。研究结果将提高我们对北美中部环境和动物变化及其响应的认识。这将有助于将这些变化置于冰川消退期间全球环境变化的背景下。