Reconstruction og the depositional environment upstream of Potanin Glacier, MOngolian Altai, from pollen analysis
Reconstruction og the depositional environment upstream of Potanin Glacier, MOngolian Altai, from pollen analysis
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蒙古阿尔泰山波塔宁冰川上游沉积环境的花粉分析重建
DOI：
10.1088/1748-9326/7/3/035402
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发表时间：
2012
影响因子：
6.7
通讯作者：
Keiko Konya ほか
中科院分区：
文献类型：
--
作者：
Fumio Nakazawa;Keiko Konya ほか
本研究分析了2008年9月和2009年9月在蒙古阿尔泰山波塔宁冰川（夏季堆积型冰川）上游挖的雪坑中的花粉，以调查近期积雪的环境。两年的雪坑观测均在海拔 3752 米、海拔 3890 米的 0 号站点和 4 号站点进行。根据不同季节散落花粉的分类单元，确定了坑的季节层。在2007年和2008年层中，在同一深度发现了从春季到夏季分散的花粉类群的浓度峰值。因此，夏季融化物到达春季层，使得融化层中的花粉粒集中在夏季融化物表面并引起花粉峰。相比之下，与每个季节相关的浓度峰值出现在 2009 年地层的不同深度，这表明 2009 年的融化程度小于 2007 年和 2008 年。该解释得到了该地区夏季温度数据（6 月至 8 月）的支持。 1990-2009 年夏季气温与月平均气温的偏差在 2009 年为负值，而 2007 年和 2008 年为正值。
This study analyzed pollen in snow pits dug in September 2008 and September 2009 upstream of Potanin Glacier in the Mongolian Altai Mountains, which is a summer accumulation-type glacier, to investigate the environment for recent snow deposits. The snow pit observations in both years were carried out at sites 0 and 4, which are 3752 and 3890 m above sea level, respectively. Seasonal layers of the pits were identified according to the taxon of pollen scattered during different seasons. In the 2007 and 2008 layers, concentration peaks of pollen taxa scattered from spring to summer were found at the same depth. Thus, the summer melt reached the spring layer such that pollen grains in the melted layer became concentrated on the summer melt surface and caused the pollen peaks. In contrast, the concentration peaks associated with each season appeared at different depths in the 2009 layer, suggesting that the degree of melting in 2009 was less than that in 2007 and 2008. This interpretation was supported by summer temperature data (June–August) for this region. Deviations in summer air temperatures from mean monthly temperatures for the summers of 1990–2009 were negative in 2009, whereas they were positive in 2007 and 2008.