Collaborative Research: Surface-Atmosphere Feedbacks and Holocene Climate Variations in Eastern North America: Linkages, Impacts, and Governing Mechanisms

合作研究：北美东部地表大气反馈和全新世气候变化：联系、影响和治理机制

• 批准号: 0402308
• 负责人: Bryan Shuman
• 金额: $ 19.85万
• 依托单位: University of Minnesota-Twin Cities
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2003
• 资助国家: 美国
• 起止时间: 2003-10-01 至 2008-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0402308&HistoricalAwards=false
• 关键词: Collaborative; Research; Surface; Atmosphere; Feedbacks

This award supports research to document the spatial and temporal modes of climate variation and land-cover change in eastern North America at millennial scales, assess the interactions between global forcings (orbital variations, trace gas concentrations) and regional controls (land-cover change, topography, lake effects) of climate and their relative effects on Holocene climate variability, and identify the critical mechanisms governing surface-atmosphere feedbacks. This research will utilize a Regional Climate Model (RegCM2) in combination with a new generation of land-cover reconstructions to detail the effect of Holocene surface-atmosphere feedbacks on atmospheric processes. Model results will be evaluated against millennially resolved climate reconstructions for eastern North America based upon multiple networks of climate proxy records. The dense networks of proxy records and the large and regionally varied changes in Holocene temperature, aridity, and land cover make eastern North America an excellent case study for the interplay between forcings external to the climate system and internal feedbacks in temperate regions. This research is important because climate variations during the Holocene were substantial, spatially variable, and spanned a wide range of frequencies and rates of change. Although these variations are in part forced by mechanisms external to the climate system, internal interactions among the atmosphere, oceans, and terrestrial biosphere are a critical source and modulator of climate variability. In particular, surface-atmosphere feedbacks are receiving increased scientific interest, due to recent demonstrations that such feedbacks exert a strong influence on Holocene and Recent climate processes at regional to global scales, with a magnitude comparable to orbital and greenhouse gas forcings. In summary, this project will advance our understanding of Holocene climate variability and the interactions between climate and vegetation dynamics, enhance the scientific infrastructure, build partnerships among institutions, and help support a new generation of climate scientists. All model and data syntheses produced during the course of this work will be stored at the World Data Center upon publication.

该奖项支持研究以记录北美东部千禧一代的气候变化和土地覆盖变化的空间和时间模式，评估全球强制（轨道变化，微量气体浓度）与区域控制（土地覆盖，地形，湖泊效应）气候及其对整个气候变化的效果的效果和确定斗争仪的相对影响。这项研究将利用区域气候模型（REGCM2）结合新一代的土地覆盖重建，以详细说明全新世表面 - 大气反馈对大气过程的影响。将根据多个气候代理记录网络对北美东部的千年来确定气候重建进行评估模型结果。代理记录的密集网络以及全新世温度，干旱和土地覆盖的巨大和区域变化，使北美东部成为了在气候系统外部和温带地区内部反馈外之间相互作用的出色案例研究。这项研究很重要，因为全新世期间的气候变化是实质性的，空间可变的，并且跨越了广泛的频率和变化速率。尽管这些变化部分是由气候系统外部的机制强制强制的，但大气，海洋和陆地生物圈之间的内部相互作用是气候变异性的关键来源和调节剂。特别是，由于最近的证明，这种反馈对全新世产生了强烈的影响，并且在全球尺度上对全球尺度上产生了强大的影响，因此表面大气反馈正在接受科学兴趣，这具有强大的影响，并且与轨道和温室气体强迫相当。 总而言之，该项目将促进我们对全新世气候变异性以及气候和植被动态之间的相互作用，增强科学基础设施，建立机构之间的伙伴关系，并帮助支持新一代气候科学家。本工作过程中生成的所有模型和数据合成将在出版后存储在世界数据中心。