Journal of Glaciology最新文献_第2页

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":"40 1","pages":""},"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

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":"41 1","pages":""},"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

Response of lacustrine glacier dynamics to atmospheric forcing in the Cordillera Darwin 科迪勒拉达尔文湖泊冰川动力学对大气强迫的响应

IF 3.4 3区地球科学

Journal of Glaciology Pub Date : 2024-02-05 DOI: 10.1017/jog.2024.14

Lukas Langhamer, Tobias Sauter, Franziska Temme, Niklas Werner, Florian Heinze, Jorge Arigony-Neto, Inti Gonzalez, Ricardo Jaña, Christoph Schneider

{"title":"Response of lacustrine glacier dynamics to atmospheric forcing in the Cordillera Darwin","authors":"Lukas Langhamer, Tobias Sauter, Franziska Temme, Niklas Werner, Florian Heinze, Jorge Arigony-Neto, Inti Gonzalez, Ricardo Jaña, Christoph Schneider","doi":"10.1017/jog.2024.14","DOIUrl":"https://doi.org/10.1017/jog.2024.14","url":null,"abstract":"Calving glaciers respond quickly to atmospheric variability through ice dynamic adjustment. Particularly, single weather extremes may cause changes in ice-flow velocity and terminus position. Occasionally, this can lead to substantial event-driven mass loss at the ice front. We examine changes in terminus position, ice-flow velocity, and calving flux at the grounded lacustrine Schiaparelli Glacier in the Cordillera Darwin using geo-referenced time-lapse camera images and remote sensing data (Sentinel-1) from 2015 to 2022. Lake-level records, lake discharge measurements, and a coupled energy and mass balance model provide insight into the subglacial water discharge. We use downscaled reanalysis data (ERA-5) to identify climate extremes and track land-falling atmospheric rivers to investigate the ice-dynamic response on possible atmospheric drivers.Meltwater controls seasonal variations in ice-flow velocity, with an efficient subglacial drainage system developing during the warm season and propagating up-glacier. Calving accounts for 4.2% of the ice loss. Throughout the year, warm spells, wet spells, and landfalling atmospheric rivers promote calving. The progressive thinning of the ice destabilizes the terminus position, highlighting the positive feedback between glacier thinning, near-terminus ice-flow acceleration, and calving flux.","PeriodicalId":15981,"journal":{"name":"Journal of Glaciology","volume":"23 1","pages":""},"PeriodicalIF":3.4,"publicationDate":"2024-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140025509","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

Validating ensemble historical simulations of Upernavik Isstrøm (1985–2019) using observations of surface velocity and elevation 利用地表速度和海拔观测数据验证乌珀纳维-伊斯特拉姆的历史模拟集合（1985-2019 年

IF 3.4 3区地球科学

Journal of Glaciology Pub Date : 2024-02-05 DOI: 10.1017/jog.2024.10

Eliot Jager, Fabien Gillet-Chaulet, Jérémie Mouginot, Romain Millan

{"title":"Validating ensemble historical simulations of Upernavik Isstrøm (1985–2019) using observations of surface velocity and elevation","authors":"Eliot Jager, Fabien Gillet-Chaulet, Jérémie Mouginot, Romain Millan","doi":"10.1017/jog.2024.10","DOIUrl":"https://doi.org/10.1017/jog.2024.10","url":null,"abstract":"The future of tidewater glaciers in response to climate warming is one of the largest sources of uncertainty in the contribution of the Greenland ice sheet to global sea-level rise. In this study, we investigate the ability of an ice-sheet model to reproduce the past evolution of the velocity and surface elevation of a tidewater glacier, Upernavik Isstrøm, by prescribing front positions. To achieve this, we run two ensembles of simulations with a Weertman and a regularised-Coulomb friction law. We show that the ice-flow model has to include a reduction in friction in the first 15 km upstream of the ice front in fast-flowing regions to capture the trends observed during the 1985–2019 period. Without this process, the ensemble model overestimates the ice flow before the retreat of the front in 2005 and does not fully reproduce its acceleration during the retreat. This results in an overestimation of the total mass loss between 1985 and 2019 of 50% (300 vs 200 Gt). Using a variance-based sensitivity analysis, we show that uncertainties in the friction law and the ice-flow law have a greater impact on the model results than surface mass balance and initial surface elevation.","PeriodicalId":15981,"journal":{"name":"Journal of Glaciology","volume":"19 1","pages":""},"PeriodicalIF":3.4,"publicationDate":"2024-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140075585","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

Greater than the sum of its parts: optical remote sensing and sediment core data provide a holistic perspective on glacial processes 大于各部分之和：光学遥感和沉积岩芯数据提供了冰川过程的整体视角

IF 3.4 3区地球科学

Journal of Glaciology Pub Date : 2024-01-29 DOI: 10.1017/jog.2024.7

Henry Jacob Miller Gage, Carolyn Hope Eyles

{"title":"Greater than the sum of its parts: optical remote sensing and sediment core data provide a holistic perspective on glacial processes","authors":"Henry Jacob Miller Gage, Carolyn Hope Eyles","doi":"10.1017/jog.2024.7","DOIUrl":"https://doi.org/10.1017/jog.2024.7","url":null,"abstract":"In this letter we make the case that closer integration of sediment core and passive optical remote sensing data would provide new insights into past and contemporary glacio-sedimentary processes. Sediment cores are frequently used to study past glacial processes and environments as they contain a lengthy geochemical and sedimentological record of changing conditions. In contrast, optical remote sensing imagery is used extensively to examine contemporary glacial processes, including meltwater dynamics, glacial retreat, calving, and ice accumulation. While paleoenvironmental data from sediment cores and optical remote sensing imagery are rarely used in tandem, they are complementary. Sediment core records are spatially discrete, providing long-term paleoenvironmental proxy data which require assumptions about environment-sediment linkages. Optical imagery offers precise, spatially extensive data to visualize contemporary processes often limited in their temporal extent. We suggest that methodologies which integrate optical remotely sensing with sediment core data allow direct observation of processes interpolated from sedimentological analysis and achieve a more holistic perspective on glacial processes. This integration addresses the limitations of both data sources and can achieve a stronger understanding of glacier dynamics by expanding the spatiotemporal extent of data, reducing the uncertainty of interpretations, and broadening the local analyses to regional and global scales.","PeriodicalId":15981,"journal":{"name":"Journal of Glaciology","volume":"1 1","pages":""},"PeriodicalIF":3.4,"publicationDate":"2024-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139969181","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

Investigating the Past, Present and Future Responses of Shallap and Zongo Glaciers, Tropical Andes, to the El Niño Southern Oscillation 调查热带安第斯山脉沙勒普和宗戈冰川过去、现在和未来对厄尔尼诺南方涛动的反应

IF 3.4 3区地球科学

Journal of Glaciology Pub Date : 2024-01-10 DOI: 10.1017/jog.2023.107

Alasdair Richardson, Rachel Carr, Simon Cook

引用次数: 0

Propagating speedups during quiescence escalate to the 2020–2021 surge of Sít’ Kusá, southeast Alaska 静止期间的传播加速升级为 2020-2021 年阿拉斯加东南部 Sít' Kusá 的激增

IF 3.4 3区地球科学

Journal of Glaciology Pub Date : 2024-01-09 DOI: 10.1017/jog.2023.99

Jukes Liu, Ellyn M. Enderlin, Timothy C. Bartholomaus, Yoram Terleth, Thomas Dylan Mikesell, Flavien Beaud

{"title":"Propagating speedups during quiescence escalate to the 2020–2021 surge of Sít’ Kusá, southeast Alaska","authors":"Jukes Liu, Ellyn M. Enderlin, Timothy C. Bartholomaus, Yoram Terleth, Thomas Dylan Mikesell, Flavien Beaud","doi":"10.1017/jog.2023.99","DOIUrl":"https://doi.org/10.1017/jog.2023.99","url":null,"abstract":"We use satellite image processing techniques to measure surface elevation and velocity changes on a temperate surging glacier, Sít’ Kusá, throughout its entire 2013–2021 surge cycle. We present detailed records of its dynamic changes during quiescence (2013–2019) and its surge progression (2020–2021). Throughout quiescence, we observe order-of-magnitude speedups that propagate down-glacier seasonally from the glacier's upper northern tributary, above a steep icefall, into the reservoir zone for the surging portion of the glacier. The speedups initiate in fall and gradually accelerate through winter until they peak in late spring, ~1 − 2 months after the onset of melt. Propagation distance of the speedups controls the distribution of mass accumulation in the reservoir zone prior to the surge. Furthermore, the intensity and propagation distance of each year's speedup is correlated with the positive degree day sum from the preceding melt season, suggesting that winter melt storage drives the seasonal speedups. We demonstrate that the speedups are kinematically similar to the 2020–2021 surge, differing mainly in that the surge propagates past the dynamic balance line at the lower limit of the reservoir zone, likely triggered by the exceedance of a tipping point in mass accumulation and basal enthalpy in the reservoir zone.","PeriodicalId":15981,"journal":{"name":"Journal of Glaciology","volume":"57 1","pages":""},"PeriodicalIF":3.4,"publicationDate":"2024-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139411078","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

Performance characterization of a new, low-cost multi-GNSS instrument for the cryosphere 用于冰冻圈的新型低成本多重全球导航卫星系统仪器的性能鉴定

IF 3.4 3区地球科学

Journal of Glaciology Pub Date : 2024-01-04 DOI: 10.1017/jog.2023.97

Derek James Pickell, Robert Lyman Hawley

引用次数: 0

How to handle glacier area change in geodetic mass balance 如何处理大地质量平衡中的冰川面积变化

IF 3.4 3区地球科学

Journal of Glaciology Pub Date : 2023-12-21 DOI: 10.1017/jog.2023.86

C. Florentine, L. Sass, C. McNeil, Emily Baker, S. O’Neel

引用次数: 0

Rapid and synchronous response of outlet glaciers to ocean warming on the Barents Sea coast, Novaya Zemlya. 新泽姆利亚巴伦支海沿岸出口冰川对海洋变暖的快速同步响应。

IF 3.4 3区地球科学

Journal of Glaciology Pub Date : 2023-12-18 DOI: 10.1017/jog.2023.104

Rachel Carr, Zoe Murphy, P. Nienow, Livia Jakob, Noel Gourmelen

引用次数: 0