Polar Science最新文献

Predictability and applicability evaluation of winter temperatures in China based on Eurasian Arctic sea ice concentrations in autumn

IF 1.5 4区地球科学

Polar Science Pub Date : 2025-03-01 DOI: 10.1016/j.polar.2024.101133

Y. Ma , L. Zhao , J.-S. Wang , Q. Wu , X. Li , Q. Li , W. Cheng , T. Yu , L. Sun

{"title":"Predictability and applicability evaluation of winter temperatures in China based on Eurasian Arctic sea ice concentrations in autumn","authors":"Y. Ma , L. Zhao , J.-S. Wang , Q. Wu , X. Li , Q. Li , W. Cheng , T. Yu , L. Sun","doi":"10.1016/j.polar.2024.101133","DOIUrl":"10.1016/j.polar.2024.101133","url":null,"abstract":"<div><div>The current trends of a warming Arctic and a reduction in Arctic sea ice lead to remote effects on climate anomalies in mid-latitude regions. We investigate the predictability of winter temperatures in China using an empirical regression model to forecast those temperatures based on the Eurasian Arctic sea ice concentration (SIC) in autumn and explore the applicability of this prediction method. Result shows the September Eurasian SIC achieves a highly skilled seasonal prediction of winter temperature anomalies in China. A cross-validated hindcast for the leading principal component of winter temperatures in China using the September SIC within the region (40–150° E, 65–85° N) yields a correlation skill of 0.47 from 1979 to 2018. This suggests that 22% of winter temperature variance in China can be predicted by the Eurasian SIC two months in advance. Winter temperature hindcast/forecast results indicate that September SIC demonstrates a positive temporal anomaly correlation coefficient at most stations in China, with a spatial average reaching 0.32/0.29. However, its forecasting ability for the magnitude of temperature anomalies is relatively weak. Lower tropical Pacific Ocean temperatures, a weak polar vortex, and a strong Ural blocking (UB) in autumn could improve Eurasian SIC's predictive performance.</div></div>","PeriodicalId":20316,"journal":{"name":"Polar Science","volume":"43 ","pages":"Article 101133"},"PeriodicalIF":1.5,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143579390","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

Molecular signatures of environmental adaptation mechanisms of Rhizocarpon geographicum in Horseshoe Island (west of the Antarctic Peninsula) and Türkiye

IF 1.5 4区地球科学

Polar Science Pub Date : 2025-03-01 DOI: 10.1016/j.polar.2024.101134

Ekrem Bölükbaşı , Mehmet Gökhan Halıcı

{"title":"Molecular signatures of environmental adaptation mechanisms of Rhizocarpon geographicum in Horseshoe Island (west of the Antarctic Peninsula) and Türkiye","authors":"Ekrem Bölükbaşı , Mehmet Gökhan Halıcı","doi":"10.1016/j.polar.2024.101134","DOIUrl":"10.1016/j.polar.2024.101134","url":null,"abstract":"<div><div>The adaptation of lichen species to different habitats and extreme conditions is due to rapid changes in expressions of the genes in their genetic backgrounds. In this study, lichen samples were collected from two different regions: from Horseshoe Island, located to the west of the Antarctic Peninsula and from the west coast of Türkiye. The <em>nrITS</em> gene regions of the samples were studied and the phylogenetic positions of the samples were confirmed as <em>Rhizocarpon geographicum</em> (L.) DC. After DNA barcoding of <em>R. geographicum</em>, expression differences of three below-specified stress genes were revealed. Comparative determinations of the changes in the expressions of the <em>multiprotein binding factor-1</em> (<em>MBF-1</em>), <em>polyketide synthase</em> (<em>PKS</em>), and <em>photosystem II D1 protein</em> (<em>psbA</em>) genes due to temperature or other environmental stress change stress were performed by a real-time PCR. Specifically, under cold stress conditions such as those found on Horseshoe Island, the <em>MBF-1</em> gene was highly expressed, while <em>PKS</em> and <em>psbA</em> gene expression levels were lower compared to the west coast of Türkiye. The results of this study, which is the first in its field, highlight the adaptation of <em>Rhizocarpon geographicum</em> specimens to those habitats and regional climate. Specimen collected from different geographical regions exhibited gene expression differences.</div></div>","PeriodicalId":20316,"journal":{"name":"Polar Science","volume":"43 ","pages":"Article 101134"},"PeriodicalIF":1.5,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143579959","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

First record of a halacarid mite Bradyagaue drygalskii (Halacaroidea, Acari) from Lützow-Holm Bay in East Antarctica

IF 1.5 4区地球科学

Polar Science Pub Date : 2025-03-01 DOI: 10.1016/j.polar.2024.101131

Hiroshi Abé , Ichiro Takeuchi

引用次数: 0

Characterization of marine litter in the vicinity of the Machu Picchu Scientific Base, King George Island, Antarctica

IF 1.5 4区地球科学

Polar Science Pub Date : 2025-03-01 DOI: 10.1016/j.polar.2025.101170

Gabriel Enrique De-la-Torre , Williams Ramos , Victor Pretell , Luis Santillán

引用次数: 0

Projected changes in near-surface wind speed in the Arctic by a regional climate model

IF 1.5 4区地球科学

Polar Science Pub Date : 2025-03-01 DOI: 10.1016/j.polar.2024.101162

Mirseid Akperov , Wenxin Zhang , Torben Koenigk , Alexey Eliseev , Vladimir A. Semenov , Igor I. Mokhov

{"title":"Projected changes in near-surface wind speed in the Arctic by a regional climate model","authors":"Mirseid Akperov , Wenxin Zhang , Torben Koenigk , Alexey Eliseev , Vladimir A. Semenov , Igor I. Mokhov","doi":"10.1016/j.polar.2024.101162","DOIUrl":"10.1016/j.polar.2024.101162","url":null,"abstract":"<div><div>This study investigates seasonal changes in near-surface wind speeds in the Arctic using the regional climate model (RCM) simulations with RCA4 driven by four global climate models (GCMs) CMIP5 under Representative Concentration Pathways (RCP) 4.5 and 8.5 scenarios. In addition, the RCM RCA-GUESS (RCA4 with interactive vegetation dynamics) is used to investigate the role of biogeophysical feedbacks in modulating near-surface wind speeds under different RCP scenarios. Our results show that the reduction in ocean surface roughness induced by sea-ice reduction leads to a projected increase in near-surface wind speeds over the Arctic Ocean, with the most pronounced effects occurring in autumn and winter. Overall, the projected changes in near-surface wind speeds from the RCM are consistent with the changes from the forcing GCMs though the RCM simulations show larger amplitude changes compared to the GCMs. The expansion of vegetation on land increases surface roughness and alters atmospheric circulation by modifying static stability and the land-sea temperature contrast, leading to changes in near-surface wind speeds. Specifically, wind speeds decrease over continental regions but increase over parts of the Arctic Ocean. This study emphasizes that interactive vegetation dynamics significantly influence changes in land surface properties and near-surface wind speeds. These processes should be incorporated into Earth system models to enhance the accuracy of future climate projections.</div></div>","PeriodicalId":20316,"journal":{"name":"Polar Science","volume":"43 ","pages":"Article 101162"},"PeriodicalIF":1.5,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143579392","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

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

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

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

Nutrient dynamics and biogeochemical processes at the Polar front of Indian sector of the Southern Ocean: Influence of Circumpolar deep water intrusion

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