Collaborative Research: Identifying Hydroclimatic Regimes of Carbon Stability in Northern Peatlands: Holocene Data Analysis and Process-Based Modeling

合作研究：确定北部泥炭地碳稳定性的水文气候机制：全新世数据分析和基于过程的建模

• 批准号: 0628455
• 负责人: Zicheng Yu
• 金额: $ 54.31万
• 依托单位: Lehigh University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2006
• 资助国家: 美国
• 起止时间: 2006-10-01 至 2011-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0628455&HistoricalAwards=false
• 关键词: Collaborative; Research; Identifying; Hydroclimatic; Regimes

Arctic peatlands have existed as a significant reservoir of terrestrial carbon over many thousands of years, including during periods of much warmer global climate. Peatland carbon accumulation rates, their persistence and their ability to exchange radiatively important carbon gases such as carbon dioxide and methane with the atmosphere throughout the Holocene (~last 10,000 years) have implications for the earth's global carbon budget, past and future radiative forcing of climate and the continued stability of these ecosystems. A team of U.S. modelers and observationalists will work together with colleagues from several Arctic countries to better model the factors responsible for long term sequestration of organic carbon including peatland hydrology, vegetative composition, interaction with permafrost and the role of microbially mediated anoxia. The overlying hypothesis to be investigated is that within a reasonably broad zone of climate and ecosystem conditions, internal dynamics of peatland hydrology, productivity and decomposition rates are responsible for the past and continued stability of these systems. Applying knowledge of this past stability to contemporary peatland conditions may enable insight as to whether future climate change will be either too rapid or too extreme for these systems to adapt or persist.An outreach effort based on an accessible temperate peatland site will also be developed as a vehicle for communicating ecological, carbon cycling and global change science themes to the general public. This work is supported under the NSF Carbon and Water in the Earth System solicitation, an interdisciplinary funding opportunity from the Directorate of Geosciences.

北极泥炭地作为陆地碳的重要储存库已经存在了数千年，包括在全球气候变暖的时期。泥炭地的碳积累速率、它们的持久性以及它们在整个全新世（~过去1万年）与大气交换具有重要辐射意义的碳气体（如二氧化碳和甲烷）的能力，对地球的全球碳收支、过去和未来的气候辐射强迫以及这些生态系统的持续稳定具有重要意义。一个由美国建模者和观测者组成的团队将与来自几个北极国家的同事合作，更好地模拟导致有机碳长期封存的因素，包括泥炭地水文、植被组成、与永久冻土的相互作用以及微生物介导的缺氧的作用。要研究的首要假设是，在相当广泛的气候和生态系统条件范围内，泥炭地水文、生产力和分解率的内部动态是这些系统过去和未来稳定的原因。将这种过去稳定性的知识应用于当代泥炭地的条件，可以使我们了解未来的气候变化是否会太快或太极端，使这些系统无法适应或持续下去。还将开展一项以可进入的温带泥炭地为基础的外联工作，作为向公众宣传生态、碳循环和全球变化科学主题的工具。这项工作得到了美国国家科学基金会地球系统碳和水招标项目的支持，这是地球科学理事会提供的跨学科资助机会。