Revisit the Medieval Warm Period and Little Ice Age in Proxy Records from Zemu Glacier Sediments, Eastern Himalaya: Vegetation and Climate Reconstruction

IF 2.3 Q2 GEOSCIENCES, MULTIDISCIPLINARY Quaternary Pub Date : 2023-05-09 DOI:10.3390/quat6020032
Nivedita Mehrotra, N. Basavaiah, Santosh K. Shah
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Abstract

The Late Holocene fossil pollen records from the Zemu glacier, located in Yabuk, North Sikkim, in the eastern Himalayas, effectively generated quantitative climate reconstructions based on the transfer function model. The transfer function model was developed by establishing a modern pollen–climate calibration set from the temperate alpine belt of North Sikkim. A redundancy analysis was carried out to detect the pattern of variation of climatic variables in the modern pollen datasets. The mean annual precipitation (MAP) and mean temperature of the warming month (MTWA) had the strongest influence on the composition of the modern pollen samples among the climatic variables considered in the analysis. Proxy data in the form of fossil pollen records were analyzed for reconstructing past climate based upon the relationships between modern pollen vegetation assemblages and climatic patterns. Transfer functions for MAP and MTWA were developed with the partial least squares (PLS) approach, and model performance was assessed using leave-one-out cross-validation. The validated model was used to reconstruct MAP and MTWA for the last 2992 cal years BP (1042 BC) in North Sikkim. The variability observed in the reconstructions was analyzed for past global climatic events. It was further compared with the available regional and hemispheric proxy-based climate reconstructions. The reconstructions captured comparable Medieval Warm Period (MWP) and Little Ice Age (LIA)-like events from the Zemu glacier region. The fossil pollen data and climate reconstructions were further compared with the mineral magnetism data of the subsurface sediment profile.
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从喜马拉雅东部泽姆冰川沉积物的代用记录中重新审视中世纪温暖期和小冰期:植被和气候重建
喜马拉雅东部锡金北部Yabuk的Zemu冰川晚全新世花粉化石记录,有效地生成了基于传递函数模型的定量气候重建。通过建立锡金北部温带高寒带的现代花粉-气候定标集,建立了传递函数模型。对现代花粉数据集进行了冗余分析,以检测气候变量的变化模式。在分析中考虑的气候变量中,年平均降水(MAP)和暖月平均温度(MTWA)对现代花粉样品组成的影响最大。基于现代花粉植被组合与气候模式的关系,分析了以化石花粉记录为代表的代用数据,重建了过去的气候。采用偏最小二乘(PLS)方法建立MAP和MTWA的传递函数,并使用留一交叉验证评估模型性能。利用该模型重建了锡金北部近2992 cal年BP (1042 BC)的MAP和MTWA。对重建过程中观测到的变率进行了对过去全球气候事件的分析。并将其与现有的基于区域和半球代理的气候重建结果进行了比较。这些重建捕获了泽木冰川地区类似中世纪温暖期(MWP)和小冰期(LIA)的事件。将花粉化石资料和气候重建资料与地下沉积物剖面的矿物磁学资料进行了比较。
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来源期刊
Quaternary
Quaternary GEOSCIENCES, MULTIDISCIPLINARY-
CiteScore
3.30
自引率
4.30%
发文量
44
审稿时长
11 weeks
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