Effect of sample preparation and scanning resolution on the Blue Reflectance of Picea abies
Effect of sample preparation and scanning resolution on the Blue Reflectance of Picea abies
复制标题
样品制备和扫描分辨率对冷杉蓝色反射率的影响
DOI：
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
J. Esper
中科院分区：
文献类型：
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作者：
F. Babst;J. Esper
评估过去和最近的气候变率是环境变化研究的一项重要任务。为了生成高质量的代用数据，开发了各种方法和技术。树木年轮可能是跨越过去千年的最重要的年度分辨率代用指标（Ehran et al. 2004），通过使用广泛采用的X射线方法（Polge 1966，Schweingruber 1988，帕克et al. 1978，D'Arrigo et al. 2000，Cown et al. 2004）测量最大晚材密度（MXD），获得了特别强的气候信号。根据各种针叶树物种，这些数据已经成功地重建了远北方（Briffa等人，2001年）和高海拔（Buntgen等人，2006年）环境过去的温度变化。在实践中，由于昂贵的设备，费力的样品制备和耗时的测量程序，许多研究人员无法直接使用这种技术。因此，最近人们努力提高X射线密度测定法的效率（Bergsten等人，2001年），或者开发与基于X射线的MXD方法同样可靠但更容易和有效应用的替代古气候代用指标（Frank 1998，Sheppard等人，1996，Schinker等人，2003年）。McCarroll等人（2002）评估了松树多波段数字图像（RGB）的适用性（
Assessing past and recent climate variability is an important task in environmental change research. Various methods and techniques have been developed in order to generate high-quality proxy data. In Tree-rings, which are perhaps the most important annually resolved proxy that spans the past millennium (Esper et al. 2004), particularly strong climate signals have been achieved by measuring maximum latewood density (MXD) using the widely established X-ray method (Polge 1966, Schweingruber 1988, Parker et al. 1978, D’Arrigo et al. 2000, Cown et al. 2004). Such data have been produced to successfully reconstruct past temperature variations from far northern (Briffa et al. 2001) and high elevation (Buntgen et al. 2006) environments, based on various conifer species. In praxis, the application of this technique is not directly accessible for many researchers due to costly equipment, a laborious sample preparation and time consuming measurement procedures. For this reason, efforts have recently been made to either increase the efficiency of X-ray densitometry (Bergsten et al. 2001) or develop alternative paleoclimate proxies which are as reliable as the X-ray based MXD method, but can be applied more readily and efficiently (Frank 1998, Sheppard et al. 1996, Schinker et al. 2003). McCarroll et al. (2002) assessed the suitability of multiband digital images (RGB) of pine (