Collaborative Research: P2C2--Extending Tree-Ring Based Reconstructions of Atlantic Gulf Basin Hydroclimate over the Common Era Using Old-Growth Sinker Wood

合作研究：P2C2——使用古老的沉降木扩展大西洋湾盆地水文气候的树轮重建

• 批准号: 2202857
• 负责人: Bryan Black
• 金额: $ 40.03万
• 依托单位: University of Arizona
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2022
• 资助国家: 美国
• 起止时间: 2022-07-15 至 2025-06-30
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2202857&HistoricalAwards=false
• 关键词: Collaborative; Research; P2C2; Extending; Tree

The general goal of the research is to collect old-growth bald cypress and longleaf pine samples from trees that were cut in the late 19th and early 20th century to extend existing bald cypress tree-ring chronologies over the full Common Era.Baldcypress is one of the key tree species for tree-ring based climate reconstruction in the southeastern United States (U.S.), because of its longevity and its distinct sensitivity to spring and summer precipitation variability. Even though it has widespread applications in regional and continental-scale high-resolution paleoclimate research, the full spatiotemporal extent of its dendroclimatic potential is yet to be explored. The lack of remnant old-growth bald cypress stands with long-lived trees, in particular, contributes to the dearth of millennium-length chronologies in the Atlantic Gulf Basin (AGB). In the 19th and 20th century, old-growth forests, including bald cypress and longleaf pine stands, throughout the AGB were excessively exploited for the booming construction industry and few forests survived. During this commercial exploitation period, many logs were lost, stuck in river bends, in transport from the swamp harvest location to the mill sites. A century later, caches of such long-lived ‘sinker wood’ can be found on the bottoms of many AGB rivers and slips, forming the only reliable source of old-growth timber and a unique source for expanding the spatiotemporal reach of AGB dendrochronology.The researchers aim to use the extended chronologies to develop regional and seasonal AGB hydroclimate reconstructions that span the entire Common Era (1CE-present). On the interannual to decadal time scales best captured by bald cypress-based reconstructions, summer AGB hydroclimate variability is primarily influenced by Atlantic Multidecadal Variability (AMV). The resulting AGB hydroclimate reconstruction will build upon existing reconstructions of past AMV in three important ways: (a) temporal extension, (b) spatial extension, and (c) sub-seasonal resolution. Common Era-length reconstructions could improve the understanding of the regional expression of past periods of global-scale climate variability, specifically the Late Antique Little Ice Age (ca. 536-660 CE) and the Roman Climate Optimum (ca. 300 BCE -400 CE). Moreover, AGB reconstructions would provide important anchor points in the subtropics, a region typically underrepresented in terrestrial proxy networks. Furthermore, by developing independent earlywood and latewood width chronologies, the research team plans to reconstruct AGB hydroclimate variability at sub-seasonal resolution, which can help improve the understanding of the dynamical nature of large-scale ocean-atmosphere forcing of climate.The potential Broader Impacts include greater understanding of water resources in the southeastern United States, support for a post-doctoral researcher, a project-based undergraduate research experience course at the University of Arizona aimed at attracting under-represented students to scientific research, and outreach and field trips to the for local schools.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

这项研究的一般目标是收集从19世纪末和20世纪初切割的树木中的旧生长秃头和长叶的松树样品，以扩展在整个公共时代，以扩展现有的秃头赛普拉斯树环的年代学。BbaldCypress是基于树环的春季和夏季延伸的繁华范围和它的独特范围，这是基于树环的气候及其独特的境地的关键树种。即使它在区域和连续的高分辨率古气候研究中具有广泛应用，但其树状气候潜力的全空间时间范围尚未探索。缺乏残留的老养生秃头柏树占据了长寿的树木，尤其是在大西洋海湾盆地（AGB）中千年时间表的死亡。在19世纪和20世纪，整个AGB的旧生长森林（包括秃头柏树和Longleaf Pine摊位）被极为蓬勃发展的建筑业所剥削，很少有森林幸存。在这个商业剥削期间，丢失了许多原木，卡在河里，从沼泽收获地点到工厂地点运输。一个世纪后，可以在许多AGB河流和幻灯片的底部找到如此长寿的“沉降木”，这构成了旧生长木材的唯一可靠来源，也是一个独特的来源，是AGB DendroConology的空间临时范围的独特来源。在最佳至际时期量表上最好由秃头基于柏树的重建捕获，夏季AGB氢气气候变异性主要受大西洋多衰变变异性（AMV）的影响。由此产生的AGB氢化气候重建将以三种重要方式建立在过去AMV的现有重建基础上：（a）临时扩展，（b）空间扩展以及（c）（c）亚季节分辨率。常见的ERA长度重建可以提高对全球气候变异性过去时期的区域表达的理解，特别是古董晚期的小冰河时代（CA. 536-660 CE）和罗马气候最佳（约公元前300年-400 CE）。此外，AGB重建将在亚热带中提供重要的锚点，该地区通常在地面代理网络中代表不足。 Furthermore, by developing independent earlywood and latewood width chronologies, the research team plans to reconstruct AGB hydroclimate variability at sub-seasonal resolution, which can help improve the understanding of the dynamic nature of large-scale ocean-atmosphere forcing of climate.The potential Broader Impacts Include greater understanding of water resources in the southeastern United States, support for a post-doctoral researcher, a project-based undergraduate research experience course at the University of亚利桑那州旨在吸引代表性不足的学生参加科学研究，并向当地学校进行宣传和实地考察。该奖项反映了NSF的法定任务，并被认为是值得通过基金会的知识分子和更广泛影响的评估评估标准来通过评估来支持的。