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Can lichenometry be used to date the 'Little Ice Age' glacial, maximum inIceland?

机译:LICHENOMERY学用来日期为“小冰河时代”冰川,最大iciceland?

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In Iceland, there are numerous examples of glacier advances dated to the latter half of the last century. However, in marked contrast to the Alps and northern Europe, the record of historical-age moraines before ca. 1850 is rather sparse. This paper examines to what extent this pattern reflects the actual history of glacier fluctuations, and to what extent it could be a function of preservation and dating of the geomorphological record. Measurements of Rhizocarpon geographicum sp. lichen thalli on ice-marginal moraines and sandur form the basis for the late "Little Ice Age" glacial chronology in south Iceland. Recent studies have converged on the view of a maximum glacier extent in the late nineteenth century, and not during earlier and possibly colder parts of the "Little Ice Age". Here, results of independent dating of moraine ridges and a jokulhlaup deposit demonstrate that conventional lichenometric techniques tend to cluster dates of these landforms to the 1860s-1880s, underestimating tephrochronological dates on the same landforms by >100 yr in some cases. Amid-eighteenth century glacial maximum may be better represented in the landform record than hitherto thought, with implications for reconstruction of North Atlantic circulation patterns.
机译:在冰岛,在上世纪下半叶的冰川进展情况下有许多冰川的榜样。然而,与阿尔卑斯山和北欧的标志对比,在加利福尼亚州之前的历史时代冰片的记录。 1850年相当稀疏。本文审查了这种模式在多大程度上反映了冰川波动的实际历史,以及它可能是保护和约会的几何形式记录的函数。 Rhizocarpon地理泵的测量。地衣丁基在冰边缘的冰片和Sandur构成了南冰岛冰川后期冰川年表的基础。最近的研究在十九世纪末的最大冰川范围内融合在内,而不是在早些时候和可能是“小冰河时代”的较冷部分。在此,冰工脊和Jokulhlaup沉积物的独立约会结果表明,传统的地结室技术倾向于将这些地貌的簇日期纳入1860年代-1880S,在某些情况下通过> 100年在同一地位上估计在同一地位上的头部。在迄今为止的地形记录中,冰川最大的冰川最大值可能更好,具有对北大西洋循环模式的重建影响。

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