Tools for X-ray densitometry at the UVTRL

该提案要求为维多利亚大学树木年轮实验室（UVTRL）启动X射线密度测量研究和培训至关重要的三个工具提供资金。需要高精度的双锯片锯将木板条切割成均匀的1.0 ± 0.02 mm厚度，以便在直接扫描X射线密度计中进行分析。分析密度计的数字输出需要一台具有增强内存和视频组件的专用工作站PC，并配备ITRAX专用版本的专有WinDendro成像分析软件。UVTRL的长期研究目标是利用树木年轮数据重建不列颠哥伦比亚省海岸山脉的全新世气候历史。量化这些每年解决的气候记录提供了必要的信息，以了解和预测在加拿大太平洋地区的海洋-大气尺度的气候变率模式。树木年轮内木材密度的变化已被证明可提供实质性的气候信息。最近购置了一台由加拿大森林研究所/加拿大森林研究基金会资助的最先进的直接扫描ITRAX X射线密度计，使加拿大西部的研究人员能够开始基于木材密度的树木年轮研究。我们的目标是发展互补网络的密度派生的生活和亚化石树轮年表从气候敏感的网站。通过了解气候变率的任何固有的时间和空间模式，我们将能够揭示对理解海洋-大气耦合的潜在机制至关重要的见解。

This proposal requests funds for three tools crucial for initiating X-ray densitometric research and training at the University of Victoria Tree-Ring Laboratory (UVTRL). A high precision twinblade saw is required to cut wood slats to a uniform 1.0 ± 0.02 mm thickness for analysis in a direct scanning X-ray densitometer. A dedicated Workstation PC with enhanced memory and video components, equipped with an ITRAX-dedicated version of the proprietary WinDendro imaging analysis software, is required for analysis of the digital output of the densitometer. The long-term research goal of the UVTRL is to reconstruct the Holocene climate history of the British Columbia Coast Mountains using tree-ring data. Quantifying these annually-resolved records of climate provides information essential for understanding and predicting modes of climate variability at the ocean-atmosphere scale in Pacific Canada. Variations in wood density within annual tree rings have been shown to provide substantive climatic information. The recent acquisition of a CFI/BCKDF-funded state-of-the-art direct scanning ITRAX X-ray densitometer now permits researchers in western Canada to begin wood density based tree-ring studies. Our objective is to develop complimentary networks of density-derived living and subfossil tree-ring chronologies from climatically-sensitive sites. By understanding any inherent temporal and spatial modes of climate variability, we will be able to reveal insights critical for understanding the underlying mechanisms of ocean-atmosphere coupling.