Polar Science最新文献_第3页

IF 1.5 4区地球科学

Polar Science Pub Date : 2025-03-01 DOI: 10.1016/j.polar.2025.101165

Vladimir Maderich , Roman Bezhenar , Igor Brovchenko , Fabio Boeira Dias , Cecilia Äijälä , Petteri Uotila

{"title":"Similarities and differences in circulation beneath the Filchner- Ronne and Ross Ice Shelves: A Lagrangian point of view","authors":"Vladimir Maderich , Roman Bezhenar , Igor Brovchenko , Fabio Boeira Dias , Cecilia Äijälä , Petteri Uotila","doi":"10.1016/j.polar.2025.101165","DOIUrl":"10.1016/j.polar.2025.101165","url":null,"abstract":"<div><div>We compared circulations under the Filchner-Ronne Ice Shelf (FRIS) and the Ross Ice Shelf (RIS) using output from the Whole Antarctica Ocean Model driven by repeated year atmospheric forcing and processed by the particle-tracking Parcels model. Three Lagrangian characteristics were calculated: the visitation frequency, the mean age, and the representative particle trajectory. In both FRIS and RIS, the High Salinity Shelf Water (HSSW) entered through depressions off the western coast of ice shelves. We found that HSSW transformed into the Ice Shelf Water that departed both ice shelves at central ice front locations (approximately 58-57°W in Ronne Ice Shelf and 175°W in RIS). The outflow through the Ronne Ice Front we identified has not attracted attention until now, although it has been observed. Almost half of the particles departed FRIS through the Ronne Ice Front, whereas about 20% stayed under FRIS. The rest of the particles flow out through the Filchner Trough. In contrast, only 2% of the particles stayed under RIS. The mean age of water leaving FRIS through the Ronne Ice Front and the water leaving RIS was 7–8 years, whereas the water leaving FRIS through the Filchner Trough was about 10 years.</div></div>","PeriodicalId":20316,"journal":{"name":"Polar Science","volume":"43 ","pages":"Article 101165"},"PeriodicalIF":1.5,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143579396","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Seasonal habitat use of ringed seals in the Thule area, northwestern Greenland 格陵兰西北部图勒地区环斑海豹季节性栖息地利用情况

IF 1.5 4区地球科学

Polar Science Pub Date : 2025-03-01 DOI: 10.1016/j.polar.2024.101145

Yuta Sakuragi , Aqqalu Rosing-Asvid , Shin Sugiyama , Yoko Mitani

{"title":"Seasonal habitat use of ringed seals in the Thule area, northwestern Greenland","authors":"Yuta Sakuragi , Aqqalu Rosing-Asvid , Shin Sugiyama , Yoko Mitani","doi":"10.1016/j.polar.2024.101145","DOIUrl":"10.1016/j.polar.2024.101145","url":null,"abstract":"<div><div>Recent rapid environmental changes along the Greenland coast have significantly impacted Arctic marine mammals. The melting of tidewater glaciers influences ocean environments and ecosystems, potentially changing the distribution and behavior of Arctic marine mammals. The ringed seal (<em>Pusa hispida</em>) is a keystone species in the Arctic marine ecosystem. In this study, four ringed seals were equipped with Argos conductivity-temperature-depth (CTD) satellite relay data loggers close to tidewater glaciers in the Thule area of northwestern Greenland to investigate the relationship between their behavior and the marine environment. All seals spent most of their time in the vicinity of tidewater glacier fronts during the open-water period. After that period, the two seals moved out of the glacial fjords due to the formation of land-fast ice and stayed in the North Water Polynya area, where sea ice was relatively thin and sparse during the ice-covered period. Furthermore, CTD data suggest that ringed seals mainly dove to the depths of the water inhabited by the polar cod (<em>Boreogadus saida</em>). These habitat use characteristics, associated with distribution of ice and prey species, could potentially affect the distribution and ecology of this species under future climate change.</div></div>","PeriodicalId":20316,"journal":{"name":"Polar Science","volume":"43 ","pages":"Article 101145"},"PeriodicalIF":1.5,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143579399","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

An investigation into oil spill dynamics affected by floe-like obstacles with various distributions 不同分布的浮状障碍物对溢油动力学影响的研究

IF 1.5 4区地球科学

Polar Science Pub Date : 2025-03-01 DOI: 10.1016/j.polar.2025.101168

Motomu Oyama , Akihisa Konno , Takatoshi Matsuzawa

{"title":"An investigation into oil spill dynamics affected by floe-like obstacles with various distributions","authors":"Motomu Oyama , Akihisa Konno , Takatoshi Matsuzawa","doi":"10.1016/j.polar.2025.101168","DOIUrl":"10.1016/j.polar.2025.101168","url":null,"abstract":"<div><div>This study investigates the spreading behavior of oil spills under simulated Arctic sea ice conditions with varying concentrations below 60%. Experiments were conducted in a controlled environment using PVC pipes to mimic sea ice obstacles at concentrations of 13.4%, 26.7%, and 53.4%. Results showed that at lower concentrations, oil spreading isotropically in a circular pattern, while at the highest concentration, the spreading became anisotropic, forming a diamond shape influenced by the obstacle arrangement. Contrary to conventional numerical models that assume decreased diffusion rates with increased ice concentration, the findings suggest that the diffusion rate can increase at higher concentrations due to the spatial arrangement of obstacles. The study also highlights the predominant role of surface tension in driving oil spreading when the oil thickness is below 2 mm. These insights call for refinements in current models of oil spill behavior in ice-covered waters, emphasizing the need to consider both obstacle arrangement and interfacial dynamics for better spill prediction and management in Arctic regions.</div></div>","PeriodicalId":20316,"journal":{"name":"Polar Science","volume":"43 ","pages":"Article 101168"},"PeriodicalIF":1.5,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143579960","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Gravity strike angles from EIGEN6C4 to seek conditions favourable for hydrocarbon occurrences in the Arctic zone 利用本征6c4的重力走向角寻找北极地区有利油气赋存的条件

IF 1.5 4区地球科学

Polar Science Pub Date : 2025-03-01 DOI: 10.1016/j.polar.2024.101157

Jaroslav Klokočník , Jan Kostelecký , Aleš Bezděk

{"title":"Gravity strike angles from EIGEN6C4 to seek conditions favourable for hydrocarbon occurrences in the Arctic zone","authors":"Jaroslav Klokočník , Jan Kostelecký , Aleš Bezděk","doi":"10.1016/j.polar.2024.101157","DOIUrl":"10.1016/j.polar.2024.101157","url":null,"abstract":"<div><div>An unusual remote sensing method is employed to seek for the sedimentary areas with possible deposits of oil/gas. The gravity aspects, derived from the global high-resolution gravity field model EIGEN 6C4, namely the strike angles, are used to detect zones on land and off-shore with a higher probability of occurrences of hydrocarbons in the Arctic zone. We utilize our previous experience with the gravity aspects applied for various geological features on the Earth, the Moon, and Mars (everywhere there our knowledge of the gravity field parameters for the respective planet is already sufficient for such a task). The West Siberian basin and Yamal peninsula nearby with known and huge oil/gas resources are used as a test bed demonstrating how our method works. Then, we extrapolate to the Lomonosov Ridge in the Arctic Ocean (till now only with scientific drilling), showing the most promising localities with possible hydrocarbon occurrences. Our results can also be used for speculations about many further untapped places in the Arctic zone with prospective hydrocarbon resources.</div></div>","PeriodicalId":20316,"journal":{"name":"Polar Science","volume":"43 ","pages":"Article 101157"},"PeriodicalIF":1.5,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143579964","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Particle size distribution of ice chips produced under varies drilling conditions in the process of ice core drilling 冰芯钻探过程中不同钻探条件下产生的冰屑的粒度分布

IF 1.5 4区地球科学

Polar Science Pub Date : 2025-03-01 DOI: 10.1016/j.polar.2024.101136

Xinyu Lv , Zhihao Cui , Ting Wang , Yumin Wen , Rusheng Wang

{"title":"Particle size distribution of ice chips produced under varies drilling conditions in the process of ice core drilling","authors":"Xinyu Lv , Zhihao Cui , Ting Wang , Yumin Wen , Rusheng Wang","doi":"10.1016/j.polar.2024.101136","DOIUrl":"10.1016/j.polar.2024.101136","url":null,"abstract":"<div><div>The particle size of ice chips has a significant influence on the efficiency of the transportation of ice chips, the maximum possible rate of penetration, and eventually determines the success or failure of drilling. To determine the factors that affect the particle size of ice chips and elucidate the impact mechanism of the factors on the particle size of ice chips, an ice cutting test stand was built, the ice chips produced under different drilling conditions are sampled using the cutter with straight cutting edge and full kerf width, and the distribution of particle size of ice chips under various drilling conditions was obtained by screening and weighing methods. Finally, the influencing factors and laws on the distribution of particle size of ice chips were determined. The rake and relief angles of the cutter affect mainly the proportion of ice chips with particle sizes smaller than 0.5 mm. As the rake angle and the relief angle of the cutter increases, the proportion of ice chips with a particle size of smaller than 0.5 mm increases. The rotation speed of the drill bit and cutting depth have an impact on the overall distribution of particle size of ice chips. As the rotation speed of the drill bit and cutting depth increase, the particle size of ice chips increases. But as the increase continues, the trend of increase gradually weakens.</div></div>","PeriodicalId":20316,"journal":{"name":"Polar Science","volume":"43 ","pages":"Article 101136"},"PeriodicalIF":1.5,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143579394","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Nutrient dynamics and biogeochemical processes at the Polar front of Indian sector of the Southern Ocean: Influence of Circumpolar deep water intrusion 南大洋印度板块极地锋的营养动态和生物地球化学过程：环极深水入侵的影响

IF 1.5 4区地球科学

Polar Science Pub Date : 2025-03-01 DOI: 10.1016/j.polar.2024.101130

Melena A. Soares , R.K. Mishra , P. Sabu , V. Venkataramana , R.K. Naik , A. Sarkar , R. Chacko , N. Anilkumar

{"title":"Nutrient dynamics and biogeochemical processes at the Polar front of Indian sector of the Southern Ocean: Influence of Circumpolar deep water intrusion","authors":"Melena A. Soares , R.K. Mishra , P. Sabu , V. Venkataramana , R.K. Naik , A. Sarkar , R. Chacko , N. Anilkumar","doi":"10.1016/j.polar.2024.101130","DOIUrl":"10.1016/j.polar.2024.101130","url":null,"abstract":"<div><div>The Circumpolar Deep water (CDW) is one of the largest water masses in the Southern Ocean. The cross-frontal flow of the CDW is a vital mode of redistribution and transport of heat, salts, nutrients, etc. in the ocean. The present study aims to understand the role of the CDW intrusion on nutrient dynamics and biogeochemical processes at the Polar frontal region. The study noted a patch of high nutrients layer at ∼300–400 m in the Polar Front-II, underlying the dicothermal layer or the temperature minimum layer. This high nutrient patch was attributed to the intrusion of the CDW at the Polar front, influencing the physico-chemical processes in the water column. It was evident that, the density gradient, stratification and overall, the combined effect of physico-chemical and biological factors as a consequence of intrusion of the CDW contributed to the formation of the high nitrate patch at the Polar Front-II. Even though, the CDW intrusion did not significantly impact the photic layer dynamics during this study, the possible barrier effect during austral summer contribute to the formation of the high nitrate layer. This feature may be responsible for trapping nutrients in the subsurface due to stratification, and made available to the photic region via upwelling processes, consequently triggering changes in the biological community structure and biogeochemical processes.</div></div>","PeriodicalId":20316,"journal":{"name":"Polar Science","volume":"43 ","pages":"Article 101130"},"PeriodicalIF":1.5,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143579965","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Spatial and temporal occurrence of two Gyrodinium species in the seasonal ice zone off Wilkes Land, Southern Ocean 南大洋威尔克斯陆附近季节性冰区两种 Gyrodinium 的时空分布情况

IF 1.5 4区地球科学

Polar Science Pub Date : 2025-03-01 DOI: 10.1016/j.polar.2025.101169

Ryo Matsuda , Masayoshi Sano , Chiho Tsuchiya , Keigo D. Takahashi , Shintaro Takao , Kohei Mizobata , Masato Moteki , Ryosuke Makabe , Norio Kurosawa

{"title":"Spatial and temporal occurrence of two Gyrodinium species in the seasonal ice zone off Wilkes Land, Southern Ocean","authors":"Ryo Matsuda , Masayoshi Sano , Chiho Tsuchiya , Keigo D. Takahashi , Shintaro Takao , Kohei Mizobata , Masato Moteki , Ryosuke Makabe , Norio Kurosawa","doi":"10.1016/j.polar.2025.101169","DOIUrl":"10.1016/j.polar.2025.101169","url":null,"abstract":"<div><div>Sea ice is crucial for regulating primary production and carbon export. Among sea ice-dwelling organisms, the genus <em>Gyrodinium</em> (Dinophyceae) are particularly significant, with their release into the water column influencing carbon flow in the lower food web. Specifically, <em>G. rubrum</em> and <em>G. heterogrammum</em> feed on phytoplankton and may contribute to carbon export, as their cells resemble fecal pellets. However, due to the challenges in quantifying <em>Gyrodinium</em> cells microscopically, the species-specific dynamics of these organisms remained unclear in the seasonal ice zone of the Southern Ocean. This study investigates the abundance of <em>G. rubrum</em> and <em>G. heterogrammum</em> in sea ice, seawater, and sinking particles using quantitative PCR analysis. Our results indicate that <em>G. rubrum</em> is widely distributed from coastal polynyas to continental slopes, whereas <em>G. heterogrammum</em> is confined to coastal areas. Sediment trap data showed <em>G. rubrum</em> flux at 60 m depth increased with sea ice melting. In contrast, <em>G. heterogrammum</em> fluxes at depths of 150 and 500 m were observed more frequently than those of <em>G. rubrum</em>, with no apparent correlation to sea ice melting. These findings suggest that <em>G. rubrum</em> distribution is closely linked to sea ice melt, whereas <em>G. heterogrammum</em> appears to be unaffected by such changes.</div></div>","PeriodicalId":20316,"journal":{"name":"Polar Science","volume":"43 ","pages":"Article 101169"},"PeriodicalIF":1.5,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143579398","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Ice thickness inversion assessment: A comparison study for Waldemarbreen and Irenebreen glaciers, Svalbard 冰厚反演评价：斯瓦尔巴群岛Waldemarbreen和Irenebreen冰川的比较研究

IF 1.5 4区地球科学

Polar Science Pub Date : 2025-03-01 DOI: 10.1016/j.polar.2025.101167

Lelde Švinka, Jānis Karušs, Kristaps Lamsters

{"title":"Ice thickness inversion assessment: A comparison study for Waldemarbreen and Irenebreen glaciers, Svalbard","authors":"Lelde Švinka, Jānis Karušs, Kristaps Lamsters","doi":"10.1016/j.polar.2025.101167","DOIUrl":"10.1016/j.polar.2025.101167","url":null,"abstract":"<div><div>Accurate ice thickness estimates are crucial for solving both glaciological and hydrological problems, and ice thickness inversion models are generally used to obtain these estimates. Several studies have assessed the accuracy of model inversions, however, usually the evaluation is done against a sparse set of field measurements. In this study, we employ the open-source models GlabTop2 and Open Global Glacier Model (OGGM) to estimate ice thickness and volume for the Waldemarbreen and Irenebreen glaciers (Svalbard archipelago), evaluating their accuracy against ground-penetrating radar (GPR) measurements. The results show that the ice thickness root-mean-square errors for GlabTop2 and OGGM are 28.5 and 13.9 m and the relative volume errors are 17.4 and 39.9%, respectively. Calibration of glacier shape factor slightly improves GlabTop2 results, however, this model tends to provide good average estimates but falls short on accurate spatial thickness distribution. On the contrary, the OGGM model is highly dependent on the chosen dataset for mass balance calibration and tends to provide better spatial distribution while performing worse regarding average thickness and overall glacier volume. Both inversion models present severe thickness errors among studied glaciers, implying the need for improvements in models and underlying theoretical assumptions that require continuous and extensive field measurements.</div></div>","PeriodicalId":20316,"journal":{"name":"Polar Science","volume":"43 ","pages":"Article 101167"},"PeriodicalIF":1.5,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143579395","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Impact of atmospheric river evolutions on Greenland ice sheet mass changes over the last two decades, 2000–2019 2000-2019年过去二十年大气河流演变对格陵兰冰盖质量变化的影响

IF 1.5 4区地球科学

Polar Science Pub Date : 2025-03-01 DOI: 10.1016/j.polar.2024.101158

Jingming Li , Xinyu Qin , Wenhao Li , C.K. Shum , Fei Li , Shengkai Zhang

{"title":"Impact of atmospheric river evolutions on Greenland ice sheet mass changes over the last two decades, 2000–2019","authors":"Jingming Li , Xinyu Qin , Wenhao Li , C.K. Shum , Fei Li , Shengkai Zhang","doi":"10.1016/j.polar.2024.101158","DOIUrl":"10.1016/j.polar.2024.101158","url":null,"abstract":"<div><div>Atmospheric rivers (ARs) serve as mechanisms that transport water vapor to the poles, triggering extreme weather events, altering weather patterns over Greenland, and even impacting mass changes in the Greenland ice sheet. In this study, we detected and extracted ARs spatiotemporal evolution characteristics over Greenland from the past two decades. And subsequently analyzed the Greenland mass changes. Our findings indicate that between 2000 and 2019, the annual occurrences of ARs varied from 13 to 27 times, with durations ranging from 156 to 610 h. Interestingly, the ARs exhibited distinct migration patterns across different periods, transitioning from a uniform distribution towards the west side of Greenland and eventually towards the east side. To delve deeper into the relationship between ARs and mass changes, we assessed the contribution of ARs to Greenland's surface mass balance using a five-year study period. The results show that the contribution of AR to SMB has a tendency to increase in stages, 20.5% from 2000 to 2004, 31.5% from 2005 to 2009, 46.4% from 2010 to 2014, and 48.2% from 2015 to 2019.</div></div>","PeriodicalId":20316,"journal":{"name":"Polar Science","volume":"43 ","pages":"Article 101158"},"PeriodicalIF":1.5,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143579391","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Unpacking inclusivity of the Antarctic Treaty System amidst contemporary challenges 在当代挑战中揭示《南极条约体系》的包容性

IF 1.5 4区地球科学

Polar Science Pub Date : 2025-03-01 DOI: 10.1016/j.polar.2024.101144

Zia Madani

引用次数: 0