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A study on a 210Pbex accumulation-decay model for dating moraine soils to trace glacier retreat time
Jiacun Chen1,3; Xinbao Zhang1; Ana Navas2; Anbang Wen1; Xiaoxiao Wang1; Runchuan Zhang1
Source PublicationJournal of Environmental Radioactivity
Contribution Rank1

This paper reports work exploring the potential for using the natural fallout radionuclide 210Pbex to date moraine soils for tracing glacier retreat. Based on the physical processes of 210Pbex deposition, decay and losses due to runoff, a 210Pbex accumulation-decay model (An=I1-λn+11-λ-b(cn+1-λn+1)c-λ ) was developed, where An= 210Pbex inventory (Bq·m-2); I = annual inventory of 210Pbex deposition (Bq·m-2); λ = 210Pb decay coefficient (0.969); n = time span (years); b and c = 210Pbex loss coefficients for the runoff pathway. The model was validated with data obtained from the Hailuogou Glacier Valley, Mt. Gongga, in 2016, where nine glacier retreat moraine points were recorded from 19101990 along a retreat length of 1750 m in the valley. 210Pbex inventories increased from 3,669.6 ± 218.5 Bq·m-2 at the site where the glacier retreated in 1990 to 10,718.9 ± 167.4 Bq·m-2 in 1910. The coefficients of b = 0.6006 and c = 0.9764 were derived from the 210Pbex inventories at the nine sites with recorded glacier retreat times that were marked with special stone and terrain features. The goodness-of-fit (GOF) for the model predictions of glacier retreat times is 65.5%. The results obtained confirm that the fallout radionuclide 210Pbex has potential for dating moraine soils in other cryosphere regions throughout the world as well as for other types of records forming sedimentary landform sequences such as soils on debris flows and alluvial fans.

Keyword210pbex Accumulation-decay Model 137cs Glacier Retreat Time Dating Moraine Soils Hailuogou Glacier China
MOST Discipline Catalogue农学
Indexed BySCI
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Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Corresponding AuthorAna Navas
Affiliation1.Key Laboratory of Mountain Surface Processes and Ecological Regulation, Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041, China
2.Estación Experimental de Aula Dei, Spanish National Research Council (EEAD-CSIC), Avda. Montañana 1005, Zaragoza, 50059, Spain
3.University of Chinese Academy of Sciences, Beijing, 100049, China
First Author Affilication中国科学院水利部成都山地灾害与环境研究所
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GB/T 7714
Jiacun Chen,Xinbao Zhang,Ana Navas,et al. A study on a 210Pbex accumulation-decay model for dating moraine soils to trace glacier retreat time[J]. Journal of Environmental Radioactivity,2020,212(1):106124.
APA Jiacun Chen,Xinbao Zhang,Ana Navas,Anbang Wen,Xiaoxiao Wang,&Runchuan Zhang.(2020).A study on a 210Pbex accumulation-decay model for dating moraine soils to trace glacier retreat time.Journal of Environmental Radioactivity,212(1),106124.
MLA Jiacun Chen,et al."A study on a 210Pbex accumulation-decay model for dating moraine soils to trace glacier retreat time".Journal of Environmental Radioactivity 212.1(2020):106124.
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