Collaborative Research: Impacts of Climate Seasonality on Carbon Accumulation and Methane Emissions of Alaskan Ecosystems during the Holocene Thermal Maximum

提案名称：合作研究：全新世热最大值期间气候季节性对阿拉斯加生态系统碳积累和甲烷排放的影响机构：里海大学摘要：日期：06/12/09该奖项由2009年美国复苏和再投资法案（公法111-5）资助。近几十年来，北极经历了巨大的变暖和生态变化。上一次明显的暖期发生在大约11000 - 9000年前的阿拉斯加。温暖和可能干燥的气候导致了不同寻常的生态系统类型和过程，包括高地的新型杨柳落叶林和低地的快速泥炭地扩张和生长。提出的研究将验证一个假设，即当时气候季节性的增强在造成高地和湿地生态系统的这种截然不同的反应中发挥了主要作用。为了研究过去，研究人员将分析保存在泥炭中的微化石。他们将整合他们的发现，并使用模拟建模来检验假设。该项目的目标是记录1万年前阿拉斯加的生态系统变化，并利用陆地生态系统模型评估气候变暖和不同季节对营养和水循环的影响。本研究解决了全球变化中的一个重要问题，即气候变暖如何与降水变化相互作用，从而影响北极生态系统的结构和功能。生态系统过程建模能力的提高将使我们能够更好地预测阿拉斯加气候变化下的碳循环变化，并有可能预测未来的泛北极生态系统。为了回应公众对北极变暖及其生物影响的浓厚兴趣，调查人员将通过大众媒体传播结果。本项目将培训本科生、研究生和一名博士后研究员。国家自然科学基金项目申请摘要。项目申请号：0919385

Proposal Title: Collaborative Research: Impacts of Climate Seasonality on CarbonAccumulation and Methane Emissions of Alaskan Ecosystemsduring the Holocene Thermal MaximumInstitution: Lehigh UniversityAbstract Date: 06/12/09This award is funded under the American Recovery and Reinvestment Act of 2009 (Public Law 111-5).The Arctic has been experiencing great warming and ecological changes in recentdecades. The last pronounced warm period occurred about 11,000-9,000 years ago in Alaska. The warm and possibly dry climate resulted in unusual ecosystem types and processes, including novel poplar-willow deciduous forests in uplands, and rapid peatland expansion and growth in lowlands. The proposed research will test the hypothesis that the enhanced climate seasonality at that time played a major role in causing such contrasting responses of ecosystems on uplands and wetlands. To look into the past, the researchers will analyze microfossils preserved in peat. They will integrate their findings and test the hypothesis using simulation modeling. The project'sobjectives are to document ecosystem changes that occurred 10,000 years ago across Alaska and to assess effects of a warmer climate and different seasonality on nutrient and water cycling using the Terrestrial Ecosystem Model.This research addresses an important topic in global change, how a warming climate will interact with changing precipitation to influence ecosystem structure and functioning in the Arctic. An improved ability to model ecosystem processes will allow for better prediction of changes in carbon cycling under a changing climate in Alaska, and potentially for Pan-Arctic ecosystems in the future. In response to the public's keen interest in Arctic warming and its biological impacts, the investigators will disseminate results through the popular press. Undergraduates, graduate students, and a postdoctoral researcher will be trained on this project. NATIONAL SCIENCE FOUNDATIONProposal AbstractProposal:0919385 PI Name:Yu, ZichengPrinted