Permafrost and Periglacial Processes最新文献_第9页

Isotopic composition of heterogeneous ice wedges in peatlands of the Pur‐Taz interfluve (northern West Siberia) Pur‐Taz交错带泥炭地（西西伯利亚北部）异质冰楔的同位素组成

IF 5 3区地球科学

Permafrost and Periglacial Processes Pub Date : 2022-02-09 DOI: 10.1002/ppp.2138

Ya. V. Tikhonravova, E. Slagoda, V. Butakov, E. Koroleva, G. Simonova, R. Sysolyatin

{"title":"Isotopic composition of heterogeneous ice wedges in peatlands of the Pur‐Taz interfluve (northern West Siberia)","authors":"Ya. V. Tikhonravova, E. Slagoda, V. Butakov, E. Koroleva, G. Simonova, R. Sysolyatin","doi":"10.1002/ppp.2138","DOIUrl":"https://doi.org/10.1002/ppp.2138","url":null,"abstract":"Heterogeneous ice wedges were studied within the peatland of the drained lake on the Pur‐Taz interfluve (67°20′14.8″, 078°55′47.1″, Northwest Siberia). The elements of the ice‐wedge structure were identified: young ice wedge, shoulders, selvages, closed‐cavity ices, and ice lenses in a peatland. Different genetic types of ice (ice vein, congelation ice, and segregated ice) were revealed by analyzing the elements of the ice‐wedge structure under polarized light and analyzing their chemical compositions. Genetic types of the ice indicate the different mechanisms of ice‐wedge formation. The ice vein forms due to fast bilateral freezing of primarily meltwater in a thermal contraction crack. The congelation ice forms due to the slow freezing of free water that has accumulated into a thermokarst cavity. The segregated ice forms due to pore water migration to the freezing zone. The elements of the ice‐wedge structure have variable stable isotope values (δ18O from −13.5‰ to −21.9‰ and δD from −87.7‰ to −154.6‰). The high range of deuterium excess values (13.8‰ to 32‰) indicates fractionation at condensation. The mean winter paleotemperature calculated using Vasil’chuk’s equations for the ice‐wedge pats formed by the ice veins varied in the range of −18 to −22°C, which is not very different from current values and is consistent with the isotopic data of ice wedges from nearby regions of Northwest Siberia. The paleotemperature average error can equal 4.5°C if we ignore the data on the ice petrographic analysis. The error depends on where and how the ice wedges are sampled, because of varying genetic types within the ground ice. This could lead to different palaeoclimatological interpretations.","PeriodicalId":54629,"journal":{"name":"Permafrost and Periglacial Processes","volume":null,"pages":null},"PeriodicalIF":5.0,"publicationDate":"2022-02-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43197573","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Distribution and characteristics of Pleistocene ground thermal contraction polygons in Europe from satellite images 欧洲更新世地面热收缩多边形的卫星图像分布与特征

IF 5 3区地球科学

Permafrost and Periglacial Processes Pub Date : 2022-01-18 DOI: 10.1002/ppp.2137

P. Bertran

引用次数: 2

Thermal regime variability of islands in the Lena River near Yakutsk, eastern Siberia 西伯利亚东部雅库茨克附近的勒拿河岛屿的热状态变化

IF 5 3区地球科学

Permafrost and Periglacial Processes Pub Date : 2022-01-18 DOI: 10.1002/ppp.2136

F. Costard, E. Gautier, P. Konstantinov, F. Bouchard, A. Séjourné, L. Dupeyrat, A. Fedorov

{"title":"Thermal regime variability of islands in the Lena River near Yakutsk, eastern Siberia","authors":"F. Costard, E. Gautier, P. Konstantinov, F. Bouchard, A. Séjourné, L. Dupeyrat, A. Fedorov","doi":"10.1002/ppp.2136","DOIUrl":"https://doi.org/10.1002/ppp.2136","url":null,"abstract":"Recent evidence has shown that Arctic regions have warmed about twice as much as elsewhere on the planet over the last few decades, and that high‐latitude permafrost–periglacial processes and hydrological systems are notably responsive to rising temperatures. The aim of this paper is to report on the thermal regime of islands located along the Lena River floodplain, upstream of the city of Yakutsk (eastern Siberia). Four islands were monitored using waterproof dataloggers and continuous monitoring of frozen soil in contact with ice breakup of the Lena River. For each of these islands, we measured: (a) ground surface temperature, air and frozen soil temperatures at different depths; and (b) submersion duration during the flood. Our results show that within a zone of thick and continuous permafrost, the Lena floodplain is notably heterogeneous, with a combination of permanently and seasonally frozen islands. The ice breakups seem to have a negligible impact on the ground thermal regime. Our study confirms that relatively young (<30 years old) islands, composed of fine sand material, appear less prone to permafrost formation compared to older islands with ice‐rich silty material.","PeriodicalId":54629,"journal":{"name":"Permafrost and Periglacial Processes","volume":null,"pages":null},"PeriodicalIF":5.0,"publicationDate":"2022-01-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42222828","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

Issue Information 问题信息

IF 5 3区地球科学

Permafrost and Periglacial Processes Pub Date : 2022-01-01 DOI: 10.1002/ppp.2118

引用次数: 0

Risk assessment of engineering diseases of embankment–bridge transition section for railway in permafrost regions 多年冻土区铁路路桥过渡段工程病害风险评价

IF 5 3区地球科学

Permafrost and Periglacial Processes Pub Date : 2021-12-15 DOI: 10.1002/ppp.2135

Saize Zhang, F. Niu, Shi Wang, Y. Sun, Jinchang Wang, Tian-Tian Dong

{"title":"Risk assessment of engineering diseases of embankment–bridge transition section for railway in permafrost regions","authors":"Saize Zhang, F. Niu, Shi Wang, Y. Sun, Jinchang Wang, Tian-Tian Dong","doi":"10.1002/ppp.2135","DOIUrl":"https://doi.org/10.1002/ppp.2135","url":null,"abstract":"The embankment–bridge transition section (EBTS) is one of the zones where railway diseases occur frequently in permafrost regions. Disease risk assessment of EBTSs can provide guidance for maintenance. In this study, considering the engineering geological conditions, climate characteristics, and embankment structure types along the Qinghai–Tibet Railway (QTR) as well as based on the disease inventory of the QTR from 2010 to 2019, the logistic regression (LR), support vector machine (SVM), and combination‐weight‐based gay relation analysis (GRA) were used for disease risk assessment of the EBTSs along the QTR in permafrost regions. The results indicate that the LR and SVM models have a better capability for EBTS disease prediction than the GRA model, and the SVM model can select more disease samples in relatively larger regions than the LR model. Based on the SVM and LR models, the risk level of EBTSs is divided into four classes: low‐ (29.9%), moderate‐ (39.6%), high‐ (22.1%), and very high (8.4%) risk. Finally, we selected 272 EBTSs in high‐ and very‐high‐risk classes for key observation during the maintenance of the QTR in permafrost regions. This study provides a reference for the risk assessment of railways built in permafrost regions using data‐driven methods.","PeriodicalId":54629,"journal":{"name":"Permafrost and Periglacial Processes","volume":null,"pages":null},"PeriodicalIF":5.0,"publicationDate":"2021-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47681676","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 6

Assessment of the sediment and associated nutrient/contaminant continuum, from permafrost thaw slump scars to tundra lakes in the western Canadian Arctic 从加拿大北极西部的永久冻土融化滑坡疤痕到冻土带湖泊，沉积物和相关营养物/污染物连续体的评估

IF 5 3区地球科学

Permafrost and Periglacial Processes Pub Date : 2021-12-01 DOI: 10.1002/ppp.2134

I. Droppo, P. Cenzo, Renée McFadyen, Thomas Reid

{"title":"Assessment of the sediment and associated nutrient/contaminant continuum, from permafrost thaw slump scars to tundra lakes in the western Canadian Arctic","authors":"I. Droppo, P. Cenzo, Renée McFadyen, Thomas Reid","doi":"10.1002/ppp.2134","DOIUrl":"https://doi.org/10.1002/ppp.2134","url":null,"abstract":"Within the Canadian Arctic, vast areas of previously frozen sediments and carbon are being released into aquatic ecosystems via the occurrence of permafrost thaw and retrogressive thaw slumps (RTSs). While knowledge of mass wasting RTS processes are more advanced, the significance of exposed retrogressive thaw slump scars (RTSSs) at various phases of stabilization to yield additional large quantities of ecologically relevant sediment to lakes and rivers is not well constrained. Using laboratory simulation (linked rainfall and lake flow dynamics), RTS sediments were investigated to assess the sediment continuum from the terrestrial RTSSs to depositional zones within two Arctic tundra lakes. Using an estimate of 30% of the RTSS areas contributing sediment under hypothetical 20‐ and 100‐year rainfall events, up to 598 and 997 kg hr−1 of RTSS sediment washoff was projected respectively. Eroded particle size, regardless of lake or initial bulk RTSS size distribution, was dominated by individual clay particles (<5 μm) that were winnowed from the RTSS surface sediment. Given this is the most biogeochemical relevant fraction, it has the potential for significant ecological impact on the lakes. This deposited fine sediment was found to be very unstable with a critical shear stress for erosion close to that of the critical shear for deposition (0.05 Pa). As such, wave energy is expected to have an impact on remobilization of fine sediments and associated compounds with concomitant implications for lake‐ecosystem health.","PeriodicalId":54629,"journal":{"name":"Permafrost and Periglacial Processes","volume":null,"pages":null},"PeriodicalIF":5.0,"publicationDate":"2021-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42746152","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Cyanobacterial weathering in warming periglacial sediments: Implications for nutrient cycling and potential biosignatures 变暖冰缘沉积物中的蓝藻风化:对养分循环和潜在生物特征的影响

IF 5 3区地球科学

Permafrost and Periglacial Processes Pub Date : 2021-11-07 DOI: 10.1002/ppp.2133

C. Demirel‐Floyd, G. Soreghan, M. Madden

{"title":"Cyanobacterial weathering in warming periglacial sediments: Implications for nutrient cycling and potential biosignatures","authors":"C. Demirel‐Floyd, G. Soreghan, M. Madden","doi":"10.1002/ppp.2133","DOIUrl":"https://doi.org/10.1002/ppp.2133","url":null,"abstract":"The cryosphere hosts a widespread microbial community, yet microbial influences on silicate weathering have been historically neglected in cold‐arid deserts. Here we investigate bioweathering by a cold‐tolerant cyanobacteria (Leptolyngbya glacialis) via laboratory experiments using glaciofluvial drift sediments at 12°C, analogous to predicted future permafrost surface temperatures. Our results show threefold enhanced Si weathering rates in pre‐weathered, mixed‐lithology Antarctic biotic reactors compared to abiotic controls, indicating the significant influence of microbial life on weathering. Although biotic and abiotic weathering rates are similar in Icelandic sediments, neo‐formed clay and Fe‐(oxy)hydroxide minerals observed in association with biofilms in biotic reactors are common on Icelandic mafic minerals, similar to features observed in unprocessed Antarctic drifts. This suggests that microbes enhance weathering in systems where they must scavenge for nutrients that are not easily liberated via abiotic pathways; potential biosignatures may form in nutrient‐rich systems as well. In both sediment types we also observed up to fourfold higher bicarbonate concentrations in biotic reactors relative to abiotic reactors, indicating that, as warming occurs, psychrotolerant biota will enhance bicarbonate flux to the oceans, thus stimulating carbonate deposition and providing a negative feedback to increasing atmospheric CO2.","PeriodicalId":54629,"journal":{"name":"Permafrost and Periglacial Processes","volume":null,"pages":null},"PeriodicalIF":5.0,"publicationDate":"2021-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42019042","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Internal structure of a large, complex rock glacier and its significance in hydrological and dynamic behavior: A case study in the semi‐arid Andes of Argentina 大型复杂岩石冰川的内部结构及其在水文和动力行为中的意义——以阿根廷半干旱安第斯山脉为例

IF 5 3区地球科学

Permafrost and Periglacial Processes Pub Date : 2021-10-27 DOI: 10.1002/ppp.2132

C. D. Villarroel, Diana Agostina Ortiz, A. Forte, Guillermo Tamburini Beliveau, D. Ponce, A. Imhof, Andrés López

{"title":"Internal structure of a large, complex rock glacier and its significance in hydrological and dynamic behavior: A case study in the semi‐arid Andes of Argentina","authors":"C. D. Villarroel, Diana Agostina Ortiz, A. Forte, Guillermo Tamburini Beliveau, D. Ponce, A. Imhof, Andrés López","doi":"10.1002/ppp.2132","DOIUrl":"https://doi.org/10.1002/ppp.2132","url":null,"abstract":"This paper presents an analysis of the internal structure, hydrogeology and dynamics of a large, complex, multilobate and multiroot rock glacier combining electrical resistivity tomography (ERT), hydrochemical data and differential interferometry synthetic aperture radar (DInSAR). The rock glacier consists of a series of overlapping lobes that represent different advancing stages with different degrees of conservation. The ERT surveys characterize the active layer and the upper part of the permafrost layer, the latter showing a heterogeneous geometry and electrical resistivity values ranging from 7 to 142 kΩm. Hydrochemical data argue for both the existence of different disconnected water flow pathways inside the rock glacier and the remarkable ionic concentrator effect of this landform. The horizontal displacement from October 2014 to April 2017 shows greatest magnitudes in the upper sector of both tongues, reaching speeds of up to 150 cm/year. The active frontal sector shows a displacement rate of 2–4.5 cm/year. This study contributes to knowledge of the material properties of rock glaciers, which are considered to represent important reservoirs/water resources, and their influence on the distribution of mountain permafrost, hydrology, and dynamics. Finally, to the best of our knowledge, the possible influence of the metal content of the ground on the resistivity values recorded for mountain permafrost is highlighted for the first time.","PeriodicalId":54629,"journal":{"name":"Permafrost and Periglacial Processes","volume":null,"pages":null},"PeriodicalIF":5.0,"publicationDate":"2021-10-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41498197","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 8

Holocene ice wedges of the Kolyma Lowland and January paleotemperature reconstructions based on oxygen isotope records 基于氧同位素记录的科雷玛低地全新世冰楔与1月古温度重建

IF 5 3区地球科学

Permafrost and Periglacial Processes Pub Date : 2021-09-24 DOI: 10.1002/ppp.2128

Y. Vasil'chuk, N. Budantseva

引用次数: 3

A 10‐yr thermal regime of permafrost beneath and adjacent to an alpine thermokarst lake, Beiluhe Basin, Qinghai–Tibet Plateau, China 青藏高原北麓河盆地高寒热岩溶湖底及其附近永久冻土的10年热状态

IF 5 3区地球科学

Permafrost and Periglacial Processes Pub Date : 2021-09-09 DOI: 10.1002/ppp.2107

Zhizhong Sun, Shujuan Zhang, Guo-yu Li, Guilong Wu, Yongzhi Liu

{"title":"A 10‐yr thermal regime of permafrost beneath and adjacent to an alpine thermokarst lake, Beiluhe Basin, Qinghai–Tibet Plateau, China","authors":"Zhizhong Sun, Shujuan Zhang, Guo-yu Li, Guilong Wu, Yongzhi Liu","doi":"10.1002/ppp.2107","DOIUrl":"https://doi.org/10.1002/ppp.2107","url":null,"abstract":"Thermokarst lakes are distributed widely in permafrost regions on the Qinghai–Tibet Plateau (QTP), China. Better knowledge of ground thermal variability beneath and around thermokarst lakes is important for understanding future landscape development and hydrological changes. At a typical undisturbed small, shallow, alpine thermokarst lake in the Beiluhe Basin on the QTP, ground temperatures beneath and adjacent to the lake were monitored at four locations with maximum 30 m depth from the lake center to natural ground. The lake is elliptical with an area of ~700 m2 and maximum water depth of 0.6 m. Permafrost was present beneath and adjacent to the lake during the monitoring period. However, supra‐taliks were present above the permafrost table beneath the lake before monitoring of ground temperature began, but were absent around the lake. The supra‐permafrost taliks beneath the lake have thickened over time. The difference in mean permafrost table depth between the lake center and natural ground reached 5.14 m, and permafrost table depths increased beneath the lake, but changed indistinctively around the lake. Mean annual ground temperatures at different depths (5, 10, 20 and 30 m) were higher beneath the lake than around the lake, and mean increasing rates of ground temperature were also greater beneath the lake than around the lake. Ground temperature differences between the lake bottom and natural ground surface are important for understanding ground thermal patterns beneath and around thermokarst lakes.","PeriodicalId":54629,"journal":{"name":"Permafrost and Periglacial Processes","volume":null,"pages":null},"PeriodicalIF":5.0,"publicationDate":"2021-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/ppp.2107","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43552126","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1