Extending annual-resolution paleoclimatic records for Atlantic Canada using dendrochronology

使用树木年代学扩展加拿大大西洋地区的年度分辨率古气候记录

• 批准号: 298128-2007
• 负责人: Laroque, Colin
• 金额: $ 1.48万
• 依托单位: Mount Allison University
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2007
• 资助国家: 加拿大
• 起止时间: 2007-01-01 至 2008-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=366315
• 关键词: Extending; annual; resolution; paleoclimatic; records

Tree-ring analysis (dendrochronology) can address many scientific questions regarding past environmental conditions, and at an annual resolution. Most regions of Canada have been investigated to some degree using dendrochronological methods, but by far the least studied is the Atlantic Coast.The primary goal of this research is to continue to fill the gap that currently exists in the Canadian dendrochronological databank. Owing to the limited old-growth forest that remains in the region, samples will be collected both from centuries-old historical structures and from the few remnant populations of old trees that remain in the region. This approach has proven to be the only means of extending tree-ring records to produce the type of long-term, annually resolved paleoenvironmental models that long-lived trees have allowed us to develop elsewhere in Canada.Data from this project will be used to explore past temperature and precipitation patterns in Atlantic Canada, including the North Atlantic Oscillation, and to develop and map paleoclimatic reconstructions.Specific objectives are to (1) continue to locate and sample any remaining remnant populations of old-growth forest in the region to establish their annual growth records; (2) use historical wooden structures to extend the growth records of individual species in the region; (3) use the extended tree-ring chronologies from multiple species along with historical climate records to develop robust paleoclimatic approximations for both terrestrial and oceanic phenomena; and (4) map the paleoclimatic history of Atlantic Canada at micro and macro scales.As human atmospheric impacts become better understood, the need for reliable regional and global climate models has never been as great. Creating robust approximations of past climatic conditions is fundamental in calibrating and verifying these models, which help us to understand past climates and to forecast future climate fluctuations in Canada and around the world.

树木年轮分析（树木年代学）可以解决许多有关过去环境条件的科学问题，并且可以每年解决。加拿大的大多数地区都使用树木年代学方法进行了一定程度的调查，但迄今为止研究最少的是大西洋海岸。这项研究的主要目标是继续填补加拿大树木年代学数据库目前存在的空白。由于该地区仅存的古老森林有限，因此将从具有数百年历史的历史建筑和该地区仅存的少量古树中采集样本。这种方法已被证明是扩展树木年轮记录以产生长期、每年解析的古环境模型的唯一方法，长寿命的树木使我们能够在加拿大其他地方开发这些模型。该项目的数据将用于探索加拿大大西洋地区过去的温度和降水模式，包括北大西洋涛动，并开发和绘制古气候重建图。具体目标是（1）继续定位和绘制古气候重建图。 对该地区所有剩余的原始森林种群进行采样，以确定其年生长记录； （2）利用历史木结构建筑来延续该地区个别物种的生长记录； (3) 使用多个物种的扩展树轮年表以及历史气候记录来开发陆地和海洋现象的可靠古气候近似值； (4) 在微观和宏观尺度上绘制加拿大大西洋地区的古气候历史图。随着人类对大气的影响得到更好的了解，对可靠的区域和全球气候模型的需求从未如此强烈。创建过去气候条件的可靠近似值对于校准和验证这些模型至关重要，这有助于我们了解过去的气候并预测加拿大和世界各地未来的气候波动。