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What can radar-based measures of subglacial hydrology tell us about basal shear stress? A case study at Thwaites Glacier, West Antarctica 基于雷达的冰川下水文测量能告诉我们什么是基底剪应力？南极洲西部 Thwaites 冰川案例研究
IF 3.4 3区 地球科学
Journal of Glaciology Pub Date : 2024-01-15 DOI: 10.1017/jog.2024.3
Rohaiz Haris, Winnie Chu, Alexander Robel
{"title":"What can radar-based measures of subglacial hydrology tell us about basal shear stress? A case study at Thwaites Glacier, West Antarctica","authors":"Rohaiz Haris, Winnie Chu, Alexander Robel","doi":"10.1017/jog.2024.3","DOIUrl":"https://doi.org/10.1017/jog.2024.3","url":null,"abstract":": Ice sheet models use observations to infer basal shear stress, but the variety of methods and datasets available has resulted in a wide range of estimates. Radar-based metrics such as reflectivity and specularity have been used to characterize subglacial hydrologic conditions that are linked to spatial variations in basal shear stress. We explore whether radar metrics can be used to inform models about basal shear stress. At Thwaites Glacier, West Antarctica, we sample basal shear stress inversions across a wide range of ice sheet models to see how the basal shear stress distribution changes in regions of varying reflectivity and specularity. Our results reveal three key findings: (1) Regions of high specularity exhibit lower mean basal shear stresses (2) Wet and bumpy regions, as characterized by high reflectivity and low specularity, exhibit higher mean basal shear stresses (3) Models disagree about what basal shear stress should be at the onset of rapid ice flow and high basal melt where reflectivity is low.","PeriodicalId":15981,"journal":{"name":"Journal of Glaciology","volume":null,"pages":null},"PeriodicalIF":3.4,"publicationDate":"2024-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139528865","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
{"title":"Investigating the Past, Present and Future Responses of Shallap and Zongo Glaciers, Tropical Andes, to the El Niño Southern Oscillation","authors":"Alasdair Richardson, Rachel Carr, Simon Cook","doi":"10.1017/jog.2023.107","DOIUrl":"https://doi.org/10.1017/jog.2023.107","url":null,"abstract":"","PeriodicalId":15981,"journal":{"name":"Journal of Glaciology","volume":null,"pages":null},"PeriodicalIF":3.4,"publicationDate":"2024-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139440823","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
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":null,"pages":null},"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
{"title":"Performance characterization of a new, low-cost multi-GNSS instrument for the cryosphere","authors":"Derek James Pickell, Robert Lyman Hawley","doi":"10.1017/jog.2023.97","DOIUrl":"https://doi.org/10.1017/jog.2023.97","url":null,"abstract":"<p>We developed a multi-frequency, multi-Global Navigation Satellite System (GNSS) positioning instrument optimized for autonomous applications in the cryosphere. At lower power requirements and a fraction of the cost and weight compared to commercially available options, this instrument simplifies field usage and associated logistics. In this paper, we assess several baseline aspects of performance in a polar environment relative to geodetic receivers commonly used for glaciological applications. Evaluations of precision and relative accuracy of positioning show millimeter to centimeter-level (‘geodetic-grade’) quality of this instrument, making it a competitive alternative for GNSS glaciological and geophysical applications such as monitoring surface elevation change and ice flow. An array of these instruments, tested in the field on the Greenland Ice Sheet, also demonstrated robustness throughout the polar winter and met power and reliability requirements.</p>","PeriodicalId":15981,"journal":{"name":"Journal of Glaciology","volume":null,"pages":null},"PeriodicalIF":3.4,"publicationDate":"2024-01-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139095850","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
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
{"title":"How to handle glacier area change in geodetic mass balance","authors":"C. Florentine, L. Sass, C. McNeil, Emily Baker, S. O’Neel","doi":"10.1017/jog.2023.86","DOIUrl":"https://doi.org/10.1017/jog.2023.86","url":null,"abstract":"","PeriodicalId":15981,"journal":{"name":"Journal of Glaciology","volume":null,"pages":null},"PeriodicalIF":3.4,"publicationDate":"2023-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138952248","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
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
{"title":"Rapid and synchronous response of outlet glaciers to ocean warming on the Barents Sea coast, Novaya Zemlya.","authors":"Rachel Carr, Zoe Murphy, P. Nienow, Livia Jakob, Noel Gourmelen","doi":"10.1017/jog.2023.104","DOIUrl":"https://doi.org/10.1017/jog.2023.104","url":null,"abstract":"","PeriodicalId":15981,"journal":{"name":"Journal of Glaciology","volume":null,"pages":null},"PeriodicalIF":3.4,"publicationDate":"2023-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138963580","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
Meteorological drivers of melt at two nearby glaciers in the McMurdo Dry Valleys of Antarctica 南极洲麦克默多干谷附近两个冰川融化的气象驱动因素
IF 3.4 3区 地球科学
Journal of Glaciology Pub Date : 2023-12-18 DOI: 10.1017/jog.2023.98
Marte G. Hofsteenge, Nicolas J. Cullen, Jonathan P. Conway, Carleen H. Reijmer, Michiel R. van den Broeke, Marwan Katurji
{"title":"Meteorological drivers of melt at two nearby glaciers in the McMurdo Dry Valleys of Antarctica","authors":"Marte G. Hofsteenge, Nicolas J. Cullen, Jonathan P. Conway, Carleen H. Reijmer, Michiel R. van den Broeke, Marwan Katurji","doi":"10.1017/jog.2023.98","DOIUrl":"https://doi.org/10.1017/jog.2023.98","url":null,"abstract":"<p>We study the meteorological drivers of melt at two glaciers in Taylor Valley, Antarctica, using 22 years of weather station observations and surface energy fluxes. The glaciers are located only 30 km apart, but have different local climates; Taylor Glacier is generally drier and windier than Commonwealth Glacier, which receives more snowfall due to its proximity to the coast. Commonwealth Glacier shows more inter-annual melt variability, explained by variable albedo due to summer snowfall events. A significant increase in surface melt at Commonwealth Glacier is associated with a decrease in summer minimum albedo. Inter-annual variability in melt at both glaciers is linked to degree-days above freezing during föhn events, occurring more frequently at Taylor Glacier. At Taylor Glacier melt occurs most often with positive air temperatures, but föhn conditions also favour sublimation, which cools the surface and prevents melt for the majority of the positive air temperatures. At Commonwealth Glacier, most of the melt instead occurs with sub-zero air temperatures, driven by strong solar radiative heating. Future melt at Taylor Glacier will likely be more sensitive to changes in föhn events, while Commonwealth Glacier will be impacted more by changes in near coastal weather, where moisture inputs can drive cloud cover, snowfall and change albedo.</p>","PeriodicalId":15981,"journal":{"name":"Journal of Glaciology","volume":null,"pages":null},"PeriodicalIF":3.4,"publicationDate":"2023-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138715827","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
Improved representation of laminar and turbulent sheet flow in subglacial drainage models 改进冰川下排水模型中层流和湍流片流的表示方法
IF 3.4 3区 地球科学
Journal of Glaciology Pub Date : 2023-12-12 DOI: 10.1017/jog.2023.103
Tim Hill, G. Flowers, Matthew J. Hoffman, Derek Bingham, M. Werder
{"title":"Improved representation of laminar and turbulent sheet flow in subglacial drainage models","authors":"Tim Hill, G. Flowers, Matthew J. Hoffman, Derek Bingham, M. Werder","doi":"10.1017/jog.2023.103","DOIUrl":"https://doi.org/10.1017/jog.2023.103","url":null,"abstract":": Subglacial hydrology models struggle to reproduce seasonal drainage patterns that are consistent with observed subglacial water pressures and surface velocities. We modify the standard sheet-flow parameterization within a coupled sheet--channel subglacial drainage model to smoothly transition between laminar and turbulent flow based on the locally computed Reynolds number in a physically consistent way (the \"transition\" model). We compare the transition model to standard laminar and turbulent models to assess the role of the sheet-flow parameterization in reconciling observed and modelled water pressures under idealized and realistic forcing. Relative to the turbulent model, the laminar and transition models improve seasonal simulations by increasing winter water pressure and producing a more prominent late-summer water pressure minimum. In contrast to the laminar model, the transition model remains consistent with its own internal assumptions across all flow regimes. Based on the internal consistency of the","PeriodicalId":15981,"journal":{"name":"Journal of Glaciology","volume":null,"pages":null},"PeriodicalIF":3.4,"publicationDate":"2023-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139009272","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
Radar internal reflection horizons from multisystem data reflect ice dynamic and surface accumulation history along the Princess Ragnhild Coast, Dronning Maud Land, East Antarctica 来自多系统数据的雷达内部反射水平面反映了南极洲东部德龙宁毛德地拉格恩希尔德公主海岸的冰层动态和地表堆积历史
IF 3.4 3区 地球科学
Journal of Glaciology Pub Date : 2023-12-12 DOI: 10.1017/jog.2023.93
Inka Koch, Reinhard Drews, Steven Franke, Daniela Jansen, Falk Marius Oraschewski, Leah Sophie Muhle, Vjeran Višnjević, Kenichi Matsuoka, Frank Pattyn, Olaf Eisen
{"title":"Radar internal reflection horizons from multisystem data reflect ice dynamic and surface accumulation history along the Princess Ragnhild Coast, Dronning Maud Land, East Antarctica","authors":"Inka Koch, Reinhard Drews, Steven Franke, Daniela Jansen, Falk Marius Oraschewski, Leah Sophie Muhle, Vjeran Višnjević, Kenichi Matsuoka, Frank Pattyn, Olaf Eisen","doi":"10.1017/jog.2023.93","DOIUrl":"https://doi.org/10.1017/jog.2023.93","url":null,"abstract":"<p>Ice shelves, which regulate ice flow from the Antarctic ice sheet towards the ocean, are shaped by spatiotemporal patterns of surface accumulation, surface/basal melt and ice dynamics. Therefore, an ice dynamic and accumulation history are imprinted in the internal ice stratigraphy, which can be imaged by radar in the form of internal reflection horizons (IRHs). Here, IRHs were derived from radar data combined across radar platforms (airborne and ground-based) in coastal eastern Dronning Maud Land (East Antarctica), comprising three ice rises and adjacent two ice shelves. To facilitate interpretation of dominant spatiotemporal patterns of processes shaping the local IRH geometry, traced IRHs are classified into three different types (laterally continuous, discontinuous or absent/IRH-free). Near-surface laterally continuous IRHs reveal local accumulation patterns, reflecting the mean easterly wind direction, and correlate with surface slopes. Areas of current and past increased ice flow and internal deformation are marked by discontinuous or IRH-free zones, and can inform about paleo ice-stream dynamics. The established IRH datasets extend continent-wide mapping efforts of IRHs to an important and climatically sensitive ice marginal region of Antarctica and are ready for integration into ice-flow models to improve predictions of Antarctic ice drainage.</p>","PeriodicalId":15981,"journal":{"name":"Journal of Glaciology","volume":null,"pages":null},"PeriodicalIF":3.4,"publicationDate":"2023-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138574374","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
Oscillatory response of Larsen C Ice Shelf flow to the calving of iceberg A-68 拉森 C 冰架水流对冰山 A-68 破裂的振荡响应
IF 3.4 3区 地球科学
Journal of Glaciology Pub Date : 2023-12-11 DOI: 10.1017/jog.2023.102
Katherine A. Deakin, Frazer D. W. Christie, Karla Boxall, Ian C. Willis
{"title":"Oscillatory response of Larsen C Ice Shelf flow to the calving of iceberg A-68","authors":"Katherine A. Deakin, Frazer D. W. Christie, Karla Boxall, Ian C. Willis","doi":"10.1017/jog.2023.102","DOIUrl":"https://doi.org/10.1017/jog.2023.102","url":null,"abstract":"","PeriodicalId":15981,"journal":{"name":"Journal of Glaciology","volume":null,"pages":null},"PeriodicalIF":3.4,"publicationDate":"2023-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138980163","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
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