Annals of Glaciology最新文献_第6页

Estimating local surface glacier mass balance from migration of the 1918 Katla eruption tephra layer on Sléttjökull, southern Iceland 从冰岛南部Sléttjökull上1918年Katla火山喷发火山层的迁移估算当地地表冰川物质平衡

IF 2.9 4区地球科学

Annals of Glaciology Pub Date : 2023-03-06 DOI: 10.1017/aog.2022.1

W. Hagg, C. Mayer, U. Münzer, Natalie Barbosa, Hans‐Martin Schuler, M. Staudacher

{"title":"Estimating local surface glacier mass balance from migration of the 1918 Katla eruption tephra layer on Sléttjökull, southern Iceland","authors":"W. Hagg, C. Mayer, U. Münzer, Natalie Barbosa, Hans‐Martin Schuler, M. Staudacher","doi":"10.1017/aog.2022.1","DOIUrl":"https://doi.org/10.1017/aog.2022.1","url":null,"abstract":"\u0000 We use the apparent horizontal shift of an englacial tephra layer outcrop to calculate local glacier mass balance on Sléttjökull, a lobe of Mýrdalsjökull in Southern Iceland. For this approach, the dipping angle of the englacial tephra layer in the glacier upstream of the outcrop and the flow velocity of the ice need to be known. An earlier investigation was expanded by the application of ground-penetrating radar, detecting the depth of the tephra along tracks with a total length of 10 km. Interpolation between the tracks enables us to derive the dipping angle of the layer along several flow lines. Together with glacier surface velocities, determined from feature tracking, we are able to estimate the local surface mass balance from the horizontal displacement of the tephra outcrop using freely available satellite imagery without additional fieldwork. The earlier local balance series was extended to the period 2014/15 to 2019/20. Although the results for the individual profiles differ slightly from each other, they show the same temporal pattern and clear variations from year to year. The results are compared to traditional mass-balance data from Hofsjökull. The two series show a good agreement in their interannual variability.","PeriodicalId":8211,"journal":{"name":"Annals of Glaciology","volume":" ","pages":""},"PeriodicalIF":2.9,"publicationDate":"2023-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46358909","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

GHOSTly flute music: drumlins, moats and the bed of Thwaites Glacier 幽灵般的长笛音乐:鼓声、护城河和斯韦茨冰川的床

IF 2.9 4区地球科学

Annals of Glaciology Pub Date : 2022-09-01 DOI: 10.1017/aog.2023.43

R. Alley, N. Holschuh, B. Parizek, L. Zoet, K. Riverman, A. Muto, K. Christianson, E. Clyne, S. Anandakrishnan, N. Stevens

{"title":"GHOSTly flute music: drumlins, moats and the bed of Thwaites Glacier","authors":"R. Alley, N. Holschuh, B. Parizek, L. Zoet, K. Riverman, A. Muto, K. Christianson, E. Clyne, S. Anandakrishnan, N. Stevens","doi":"10.1017/aog.2023.43","DOIUrl":"https://doi.org/10.1017/aog.2023.43","url":null,"abstract":"Abstract Glacier-bed characteristics that are poorly known and modeled are important in projected sea-level rise from ice-sheet changes under strong warming, especially in the Thwaites Glacier drainage of West Antarctica. Ocean warming may induce ice-shelf thinning or loss, or thinning of ice in estuarine zones, reducing backstress on grounded ice. Models indicate that, in response, more-nearly-plastic beds favor faster ice loss by causing larger flow acceleration, but more-nearly-viscous beds favor localized near-coastal thinning that could speed grounding-zone retreat into interior basins where marine-ice-sheet instability or cliff instability could develop and cause very rapid ice loss. Interpretation of available data indicates that the bed is spatially mosaicked, with both viscous and plastic regions. Flow against bedrock topography removes plastic lubricating tills, exposing bedrock that is eroded on up-glacier sides of obstacles to form moats with exposed bedrock tails extending downglacier adjacent to lee-side soft-till bedforms. Flow against topography also generates high-ice-pressure zones that prevent inflow of lubricating water over distances that scale with the obstacle size. Extending existing observations to sufficiently large regions, and developing models assimilating such data at the appropriate scale, present large, important research challenges that must be met to reliably project future forced sea-level rise.","PeriodicalId":8211,"journal":{"name":"Annals of Glaciology","volume":"63 1","pages":"153 - 157"},"PeriodicalIF":2.9,"publicationDate":"2022-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41388031","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Eskers associated with buried glaciers in Mars' mid latitudes: recent advances and future directions 火星中纬度地区与埋藏冰川有关的Eskers:最近的进展和未来的方向

IF 2.9 4区地球科学

Annals of Glaciology Pub Date : 2022-09-01 DOI: 10.1017/aog.2023.7

F. Butcher, N. Arnold, M. Balme, S. Conway, C. Clark, C. Gallagher, A. Hagermann, S. Lewis, A. Rutledge, R. Storrar, S. Z. Woodley

引用次数: 0

Snow spikes (penitentes) in the dry Andes, but not on Europa: a defense of Lliboutry's classic paper 在干燥的安第斯山脉上有雪，但在木卫二上没有:为利布里的经典论文辩护

IF 2.9 4区地球科学

Annals of Glaciology Pub Date : 2022-09-01 DOI: 10.1017/aog.2023.12

S. Warren

引用次数: 0

Extraction and applications of Rayleigh wave ellipticity in polar regions 极区瑞利波椭圆度的提取及应用

IF 2.9 4区地球科学

Annals of Glaciology Pub Date : 2022-09-01 DOI: 10.1017/aog.2023.1

Glenn A. Jones, B. Kulessa, A. Ferreira, M. Schimmel, A. Berbellini, A. Morelli

引用次数: 0

The 1789 Christmas Eve collision of the HMS Guardian with an iceberg in the southwest Indian Ocean 1789年圣诞节前夕，英国皇家海军“守护者”号在西南印度洋与一座冰山相撞

IF 2.9 4区地球科学

Annals of Glaciology Pub Date : 2022-09-01 DOI: 10.1017/aog.2023.8

Seelye Martin

引用次数: 2

Contribution of glaciers to water, energy and food security in mountain regions: current perspectives and future priorities 冰川对山区水、能源和粮食安全的贡献：当前观点和未来优先事项

IF 2.9 4区地球科学

Annals of Glaciology Pub Date : 2022-09-01 DOI: 10.1017/aog.2023.14

C. Clason, Sally Rangecroft, P. Owens, E. Łokas, G. Baccolo, N. Selmes, D. Beard, J. Kitch, Rosa María Dextre, S. Morera, W. Blake

引用次数: 4

Progress toward globally complete frontal ablation estimates of marine-terminating glaciers 全球完成海洋终止冰川锋面消融估计的进展

IF 2.9 4区地球科学

Annals of Glaciology Pub Date : 2022-09-01 DOI: 10.1017/aog.2023.35

W. Kochtitzky, L. Copland, W. Van Wychen, R. Hock, D. Rounce, H. Jiskoot, T. Scambos, M. Morlighem, M. King, Leo Cha, Luke Gould, Paige-Marie Merrill, A. Glazovsky, R. Hugonnet, T. Strozzi, B. Noël, F. Navarro, R. Millan, J. Dowdeswell, A. Cook, A. Dalton, S. Khan, J. Jania

{"title":"Progress toward globally complete frontal ablation estimates of marine-terminating glaciers","authors":"W. Kochtitzky, L. Copland, W. Van Wychen, R. Hock, D. Rounce, H. Jiskoot, T. Scambos, M. Morlighem, M. King, Leo Cha, Luke Gould, Paige-Marie Merrill, A. Glazovsky, R. Hugonnet, T. Strozzi, B. Noël, F. Navarro, R. Millan, J. Dowdeswell, A. Cook, A. Dalton, S. Khan, J. Jania","doi":"10.1017/aog.2023.35","DOIUrl":"https://doi.org/10.1017/aog.2023.35","url":null,"abstract":"Abstract Knowledge of frontal ablation from marine-terminating glaciers (i.e., mass lost at the calving face) is critical for constraining glacier mass balance, improving projections of mass change, and identifying the processes that govern frontal mass loss. Here, we discuss the challenges involved in computing frontal ablation and the unique issues pertaining to both glaciers and ice sheets. Frontal ablation estimates require numerous datasets, including glacier terminus area change, thickness, surface velocity, density, and climatic mass balance. Observations and models of these variables have improved over the past decade, but significant gaps and regional discrepancies remain, and better quantification of temporal variability in frontal ablation is needed. Despite major advances in satellite-derived large-scale datasets, large uncertainties remain with respect to ice thickness, depth-averaged velocities, and the bulk density of glacier ice close to calving termini or grounding lines. We suggest ways in which we can move toward globally complete frontal ablation estimates, highlighting areas where we need improved datasets and increased collaboration.","PeriodicalId":8211,"journal":{"name":"Annals of Glaciology","volume":"63 1","pages":"143 - 152"},"PeriodicalIF":2.9,"publicationDate":"2022-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45042019","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Surface mass balance monitoring of the peripheral glaciers of the Antarctic Peninsula in the context of regional climate change 区域气候变化背景下南极半岛外围冰川的表面质量平衡监测

IF 2.9 4区地球科学

Annals of Glaciology Pub Date : 2022-09-01 DOI: 10.1017/aog.2023.18

F. Navarro, Cayetana Recio-Blitz, Ricardo Rodríguez-Cielos, J. Otero, Kaian Shahateet, E. De Andrés, M. I. Corcuera, Unai Letamendia, José M. Muñoz-Hermosilla

引用次数: 0

The role of subglacial hydrology in Antarctic ice sheet dynamics and stability: a modelling perspective 冰下水文在南极冰盖动力学和稳定性中的作用：建模视角

IF 2.9 4区地球科学

Annals of Glaciology Pub Date : 2022-09-01 DOI: 10.1017/aog.2023.9

C. Dow

引用次数: 4