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

合作研究：全新世最热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

• 批准号: 0919385
• 负责人: Zicheng Yu
• 金额: $ 39.95万
• 依托单位: Lehigh University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-08-01 至 2013-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0919385&HistoricalAwards=false
• 关键词: Collaborative; Research; Impacts; Climate; Seasonality

This 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 recent decades. 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's objectives 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.

该奖项是根据2009年美国复苏和再投资法案（公法111-5）资助的。近几十年来，北极一直在经历巨大的变暖和生态变化。上一次明显的温暖期发生在大约11，000 - 9，000年前的阿拉斯加。温暖和干燥的气候导致了不寻常的生态系统类型和过程，包括高地的新杨树-柳树落叶林，以及低地泥炭地的快速扩张和生长。拟议中的研究将检验这样一个假设，即当时增强的气候季节性在造成高地和湿地生态系统这种截然不同的反应方面发挥了重要作用。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，并使用模拟建模来测试假设。该项目的目标是记录10 000年前阿拉斯加各地发生的生态系统变化，并使用陆地生态系统模型评估气候变暖和不同季节性对养分和水循环的影响。这项研究解决了全球变化中的一个重要课题，即气候变暖将如何与降水量变化相互作用，从而影响北极的生态系统结构和功能。提高模拟生态系统过程的能力将有助于更好地预测阿拉斯加气候变化下碳循环的变化，并可能在未来预测泛北极生态系统的变化。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。本科生，研究生和博士后研究员将接受该项目的培训。