Freeze-thaw cycles and associated geomorphology in a post-glacial environment:current glacial,paraglacial,periglacial and proglacial scenarios at Pico de Orizaba volcano,Mexico

作     者：Víctor SOTO Carlos M.WELSH R. Kenji YOSHIKAWA Hugo DELGADO GRANADOS Víctor SOTO;Carlos M.WELSH R.;Kenji YOSHIKAWA;Hugo DELGADO GRANADOS

作者机构：Centro de Ciencias de la TierraUniversidad VeracruzanaCircuito Gonzalo Aguirre BeltránS/NZona Universitaria91090XalapaMéxico Water and Environmental Research CenterUniversity of Alaska FairbanksFairbanksAlaska 99775USA Instituto de GeofísicaUniversidad Nacional Autónoma de MéxicoCiudad de México 04150México Department of Earth and Environmental SciencesLudwig Maximilians UniversitätMunich 80333Germany 

出 版 物：《Journal of Mountain Science》 (山地科学学报（英文）)

年 卷 期：2024年第21卷第6期

页      面：1954-1977页

核心收录：

学科分类：07[理学] 09[农学] 0903[农学-农业资源与环境] 0705[理学-地理学] 070501[理学-自然地理学] 

基　　金：support from the Programa de Apoyos para la Superación del Personal Académico (DGAPA) the support by the Alexander von Humboldt Foundation part of the SIREI project num 531062023178 developed at CCT-UV 

主　　题：Freeze-Thaw Gelifraction Mountain mechanical erosion Periglacial geomorphology Postglacial scenarios 

摘      要：The glacial history of Pico de Orizaba indicates that during the Last Glacial Maximum,its icecap covered up to~3000 m asl;due to the air temperature increasing,its main glacier has retreated to 5050 m *** retraction of the glacier has left behind an intense climatic instability that causes a high frequency of freeze-thaw cycles of great intensity;the resulting geomorphological processes are represented by the fragmentation of the bedrock that occupies the upper parts of the *** is a notable lack of studies regarding the fragmentation and erosion occurring in tropical high mountains,and the associated geomorphological risks;for this reason,as a first stage of future continuous research,this study analyzes the freezing and thawing cycles that occur above 4000 m asl,through continuous monitoring of surface ground *** results allow us to identify and characterize four zones:glacial,paraglacial,periglacial and *** was found that the paraglacial zone presents an intense drop of temperature,of up to~9℃ in only sixty *** rock fatigue and intense freeze-thaw cycles that occur in this area are responsible for the high rate of rock disintegration and represent the main factor of the constant slope dynamics that occur at the *** activity decreases,both in frequency and intensity,according to the distance to the glacier,which is where the temperature presents a certain degree of stability,until reaching the proglacial zone,where cycles are almost non-existent,and therefore there is no gelifraction *** geomorphological processes have resulted in significant alterations to the mountain slopes,which can have severe consequences in terms of risk and water.