Journal of Glaciology最新文献_第3页

Topographic and hydrological controls on partial and full surges of Little Kluane Glacier, Yukon 育空地区小克卢恩冰川部分和全部涌浪的地形和水文控制因素

IF 3.4 3区地球科学

Journal of Glaciology Pub Date : 2024-04-15 DOI: 10.1017/jog.2024.35

Brittany Main, Luke Copland, Gwenn Elizabeth Flowers, Christine Fiona Dow, Wesley Van Wychen, Sergey Samsonov, William Kochtitzky

{"title":"Topographic and hydrological controls on partial and full surges of Little Kluane Glacier, Yukon","authors":"Brittany Main, Luke Copland, Gwenn Elizabeth Flowers, Christine Fiona Dow, Wesley Van Wychen, Sergey Samsonov, William Kochtitzky","doi":"10.1017/jog.2024.35","DOIUrl":"https://doi.org/10.1017/jog.2024.35","url":null,"abstract":"We demonstrate that a ~20 km long valley glacier in the St. Elias Mountains, Yukon, can experience both partial and full surges, likely controlled by the presence of a topographic constriction and the formation and drainage of supraglacial lakes. Based on analysis of air photos, satellite images and field observations since the 1940s, we identify a full surge of ‘Little Kluane Glacier’ from 2013 to 2018, and a partial surge of just the upper north arm between 1963 and 1972. Repeat digital elevation models and velocity profiles indicate that the recent surge initiated from the upper north arm in 2013, which developed into a full surge of the main trunk from 2017 to 2018 with peak velocities of ~3600 m a−1 and frontal advance of ~1.7 km from May to September 2018. In 2016, a mass movement from the north arm to the main trunk generated a surface depression in a region immediately downstream of a topographic constriction, which promoted the formation and rapid drainage of supraglacial lakes to the glacier bed, and likely established the conditions to propel the initial partial surge into a full surge. Our results underscore the complex interplay between glacier geometry, surface hydrology and topography required to drive full surges of this glacier.","PeriodicalId":15981,"journal":{"name":"Journal of Glaciology","volume":null,"pages":null},"PeriodicalIF":3.4,"publicationDate":"2024-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141149028","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

Terminus thinning drives recent acceleration of a Greenlandic lake-terminating outlet glacier 冰川末端变薄导致格陵兰湖泊末端冰川近期加速消融

IF 3.4 3区地球科学

Journal of Glaciology Pub Date : 2024-04-01 DOI: 10.1017/jog.2024.30

Ed Holt, P. Nienow, E. Medina-Lopez

引用次数: 0

Dynamic models for impact-initiated stress waves through snow columns 通过雪柱的冲击应力波动态模型

IF 3.4 3区地球科学

Journal of Glaciology Pub Date : 2024-03-22 DOI: 10.1017/jog.2024.26

S. V. Verplanck, E. E. Adams

引用次数: 0

For whom and by whom is glaciology? 冰川学为谁服务？

IF 3.4 3区地球科学

Journal of Glaciology Pub Date : 2024-03-21 DOI: 10.1017/jog.2024.29

A. Robel, Lizz Ultee, Meghana Ranganathan, Meredith Nash

引用次数: 0

Glacier mass balance and its climatic and nonclimatic drivers in the Ladakh region during 2000–2021 from remote sensing data 从遥感数据看 2000-2021 年拉达克地区的冰川质量平衡及其气候和非气候驱动因素

IF 3.4 3区地球科学

Journal of Glaciology Pub Date : 2024-03-20 DOI: 10.1017/jog.2024.19

Arindan Mandal, Bramha Dutt Vishwakarma, Thupstan Angchuk, Mohd Farooq Azam, Purushottam Kumar Garg, Mohd Soheb

{"title":"Glacier mass balance and its climatic and nonclimatic drivers in the Ladakh region during 2000–2021 from remote sensing data","authors":"Arindan Mandal, Bramha Dutt Vishwakarma, Thupstan Angchuk, Mohd Farooq Azam, Purushottam Kumar Garg, Mohd Soheb","doi":"10.1017/jog.2024.19","DOIUrl":"https://doi.org/10.1017/jog.2024.19","url":null,"abstract":"This study investigates the geodetic mass balance of nearly all glaciers in the Ladakh region, which are crucial for local water security. Utilizing multiple digital elevation models from 2000 and 2021, we estimate glacier mass balances. Climatic drivers of glacier mass balances are explored using ERA5-Land reanalysis data, evaluated by in situ climate data. The study also examines the role of nonclimatic (morphological) variables on glacier mass balances. Results indicate Ladakh glaciers experienced negative mass balances during 2000–2021, with significant spatial variability. Western Ladakh glaciers lost slightly higher mass (−0.35 ± 0.07 to −0.37 ± 0.07 m w.e. a−1) than eastern Ladakh glaciers (−0.21 ± 0.07 to −0.33 ± 0.05 m w.e. a−1). While warming is the main driver of widespread mass loss in Ladakh, the spatial variability in mass loss is attributed to changes in regional precipitation and glacier morphological settings. Eastern Ladakh glaciers, being smaller and at higher elevations, experience lower mass loss, whereas western Ladakh glaciers, larger and at lower elevations, are more susceptible to the impact of temperature, resulting in higher mass loss. The study underscores the potentially greater vulnerability of western Ladakh glaciers to a warming climate compared to their eastern counterparts.","PeriodicalId":15981,"journal":{"name":"Journal of Glaciology","volume":null,"pages":null},"PeriodicalIF":3.4,"publicationDate":"2024-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140165651","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

Ice volume and thickness of all Scandinavian glaciers and ice caps 斯堪的纳维亚半岛所有冰川和冰盖的冰量和厚度

IF 3.4 3区地球科学

Journal of Glaciology Pub Date : 2024-03-20 DOI: 10.1017/jog.2024.25

Thomas Frank, W. V. van Pelt

引用次数: 0

Evolution of sub-ice-shelf channels reveals changes in ocean-driven melt in West Antarctica 冰架下通道的演变揭示了南极洲西部海洋驱动的融化变化

IF 3.4 3区地球科学

Journal of Glaciology Pub Date : 2024-03-19 DOI: 10.1017/jog.2024.20

K. Alley, Richard B. Alley, A. Crawford, Naomi E. Ochwat, Christian T. Wild, Juliana Marson, T. Snow, A. Muto, E. Pettit, Sarah Child, M. Truffer, Gabi Collao-Barrios, Ted Scambos

引用次数: 0

Distribution and Isotopic Compositions of n-Alkanes and n-Alkenes in Cryoconites from the Glaciers of Tibetan Plateau 青藏高原冰川中的正烷烃和正烯烃的分布及同位素组成

IF 3.4 3区地球科学

Journal of Glaciology Pub Date : 2024-03-14 DOI: 10.1017/jog.2024.23

Quanlian Li, Shichang Kang, Shijin Wang, Ninglian Wang, Xiaobo Wu, Wasim Sajjad, Huan Yang, Yao Li, Jingquan Wu

引用次数: 0

Formation and persistence of glaciovolcanic voids explored with analytical and numerical models 用分析和数值模型探讨冰川火山空洞的形成和持续性

IF 3.4 3区地球科学

Journal of Glaciology Pub Date : 2024-02-26 DOI: 10.1017/jog.2024.8

Tryggvi Unnsteinsson, Gwenn E. Flowers, Glyn Williams-Jones

{"title":"Formation and persistence of glaciovolcanic voids explored with analytical and numerical models","authors":"Tryggvi Unnsteinsson, Gwenn E. Flowers, Glyn Williams-Jones","doi":"10.1017/jog.2024.8","DOIUrl":"https://doi.org/10.1017/jog.2024.8","url":null,"abstract":"One fifth of Earth's volcanoes are covered by snow or ice and many have active geothermal systems that interact with the overlying ice. These glaciovolcanic interactions can melt voids into glaciers, and are subject to controls exerted by ice dynamics and geothermal heat output. Glaciovolcanic voids have been observed to form prior to volcanic eruptions, which raised concerns when such features were discovered within Job Glacier on Qw̓elqw̓elústen (Mount Meager Volcanic Complex), British Columbia, Canada. In this study we model the formation, evolution, and steady-state morphology of glaciovolcanic voids using analytical and numerical models. Analytical steady-state void geometries show cave height limited to one quarter of the ice thickness, while numerical model results suggest the void height h scales with ice thickness H and geothermal heat flux $dot {Q}$<img data-mimesubtype=\"png\" data-type=\"\" src=\"https://static.cambridge.org/binary/version/id/urn:cambridge.org:id:binary:20240224103735917-0112:S002214302400008X:S002214302400008X_inline1.png\"/> as $h/H = a H^b dot {Q}^c$<img data-mimesubtype=\"png\" data-type=\"\" src=\"https://static.cambridge.org/binary/version/id/urn:cambridge.org:id:binary:20240224103735917-0112:S002214302400008X:S002214302400008X_inline2.png\"/>, with exponents b = −n/2 and c = 1/2 where n is the creep exponent. Applying this scaling to the glaciovolcanic voids within Job Glacier suggests the potential for total geothermal heat flux in excess of 10 MW. Our results show that relative changes in ice thickness are more influential in glaciovolcanic void formation and evolution than relative changes in geothermal heat flux.","PeriodicalId":15981,"journal":{"name":"Journal of Glaciology","volume":null,"pages":null},"PeriodicalIF":3.4,"publicationDate":"2024-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139968936","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

Angle of Repose of Granulated Ice: Effect of Wood Ash 粒状冰的仰角：木灰的影响

IF 3.4 3区地球科学

Journal of Glaciology Pub Date : 2024-02-14 DOI: 10.1017/jog.2024.18

William M. Harris, A. Murdza, E. Schulson

引用次数: 0