P2C2: Megadrought--Local versus Remote Causal Factors for Medieval North America

P2C2：特大干旱——中世纪北美的本地与远程成因

• 批准号: 1439964
• 负责人: Song Feng
• 金额: $ 18.41万
• 依托单位: University of Arkansas
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2014
• 资助国家: 美国
• 起止时间: 2014-04-01 至 2015-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1439964&HistoricalAwards=false
• 关键词: P2C2; Megadrought; Local; versus; Remote

The researchers will investigate the relative roles of (1) remote forcing of sea surface temperatures (SST) and (2) local land surface-atmosphere interactions and feedbacks on the medieval drought in North America, approximately 900-1300 A.D. During this time, a series of multi-decadal droughts occurred which, in total, lasted longer than any 'severe' drought that has occurred during the instrumental period (e.g. the 1930's Dust Bowl).Specifically, the NCAR community atmospheric model (CAM4.0) will be used to investigate the impacts and mechanisms of SST anomalies in the tropical Pacific as well as the more certain and persistent basin-wide warm SST anomalies in the North Atlantic on medieval drought. Additionally, the Weather Research and Forecast (WRF) model, forced by output from CAM4.0, will be used to evaluate the role of devegetation and soil moisture in prolonging, enhancing, or modifying the drought. In particular, WRF will be used to examine the role of devegetation in the unprecedented wind shift which took place in the central U.S. during the Medieval Period.Undergraduate and graduate students will participate in the project. In addition, the research team will collaborate with the National Drought Mitigation Center (NDMC) and other outreach groups at the University of Nebraska-Lincoln (UNL) to increase awareness of potential water crises due to megadroughts. Drought-related information from the project would also be disseminated through the NDMC's quarterly newsletter and Nebguide (one of the UNL extension publications) and distributed free to the public.

研究人员将调查（1）远程强迫海面温度（SST）和（2）当地土地表面 - 大气层相互作用以及对北美中世纪干旱的反馈，大约900-1300的反馈。在此期间，大约900-1300的干旱，在此期间，一系列的多人次数发生了一系列的次数，这是一系列的持续时间。碗）。特别是，NCAR社区大气模型（CAM4.0）将用于研究热带太平洋中SST异常的影响和机制，以及在北大西洋北部地区对中世纪的较确定性和持久盆地范围内的温暖SST异常。 此外，由CAM4.0的产出强迫的天气研究和预测（WRF）模型将用于评估除绿色和土壤水分在延长，增强或修改干旱方面的作用。 特别是，WRF将用于检查田平果在中世纪在美国中部发生的前所未有的风转移中的作用。教学生和研究生将参加该项目。此外，研究小组将与内布拉斯加州林肯大学（UNL）的国家干旱缓解中心（NDMC）和其他外展组织合作，以提高人们对大型造成的潜在水危机的认识。该项目与干旱相关的信息也将通过NDMC的季度新闻通讯和Nebguide（其中一个不伸展出版物之一）传播，并免费分发给公众。