Polar Research最新文献_第3页

Benthic foraminiferal investigations in Middle to Late Quaternary sections of Kongsfjordhallet, north-west Svalbard 斯瓦尔巴西北部Kongsfjordhallet中晚第四纪剖面底栖有孔虫研究

4区地球科学

Polar Research Pub Date : 2023-09-29 DOI: 10.33265/polar.v42.7857

Debolina Chatterjee, Anupam Ghosh, Helena Alexanderson

{"title":"Benthic foraminiferal investigations in Middle to Late Quaternary sections of Kongsfjordhallet, north-west Svalbard","authors":"Debolina Chatterjee, Anupam Ghosh, Helena Alexanderson","doi":"10.33265/polar.v42.7857","DOIUrl":"https://doi.org/10.33265/polar.v42.7857","url":null,"abstract":"Stratigraphic sites in north-west Svalbard record at least six significant glacial advances in the last 200 Ky, and sediments deposited under locally high relative sea level during intervening interstadials or interglacials contain abundant benthic foraminifera. We present a biostratigraphic record from the Kongsfjordhallet site in the Kongsfjorden area that covers five high relative sea-level events and stretches back to the Middle Pleistocene (>195 Kya). Five foraminiferal assemblages have been identified: (1) Cassidulina reniforme – Elphidium clavatum — Islandiella helenae; (2) Cassidulina neoteretis – Cassidulina reniforme; (3) Cassidulina reniforme – Cibicides lobatulus – Cassidulina neoteretis; (4) Cibicides lobatulus – Cassidulina reniforme – Elphidium clavatum; and (5) Cassidulina reniforme – Elphidium clavatum assemblages. The assemblages suggest a distal glaciomarine environment with variable influence of seasonal sea ice and nutrient availability in the Kongsfjorden region during the five deglaciation events. The foraminiferal data are also compared with foraminiferal records from other sites in Svalbard and the adjacent Arctic Ocean.","PeriodicalId":49684,"journal":{"name":"Polar Research","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135247120","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

Observations of long-finned pilot whale (Globicephala melas) calves less than one year old, including neonates and a very recently born calf, in northern Norway 在挪威北部，对未满一岁的长鳍领航鲸(Globicephala melas)幼鲸的观察，包括新生儿和刚出生的幼鲸

4区地球科学

Polar Research Pub Date : 2023-09-28 DOI: 10.33265/polar.v42.8027

Seán A. O'Callaghan

引用次数: 0

Radiolaria and Phaeodaria (siliceous Rhizaria) in south-western and northern Norwegian fjords during late summer 2016: dominant species and biomass in shallow-water assemblages 2016年夏末，挪威西南部和北部峡湾的放射菌和硅酸根菌:浅水组合中的优势物种和生物量

4区地球科学

Polar Research Pub Date : 2023-09-21 DOI: 10.33265/polar.v42.9584

Takahito Ikenoue, Kjell Bjørklund, Anders K. Krabberød, Shigeto Nishino, Paul Wassmann

{"title":"Radiolaria and Phaeodaria (siliceous Rhizaria) in south-western and northern Norwegian fjords during late summer 2016: dominant species and biomass in shallow-water assemblages","authors":"Takahito Ikenoue, Kjell Bjørklund, Anders K. Krabberød, Shigeto Nishino, Paul Wassmann","doi":"10.33265/polar.v42.9584","DOIUrl":"https://doi.org/10.33265/polar.v42.9584","url":null,"abstract":"To determine the present-day community composition of siliceous Rhizaria (Radiolaria and Phaeodaria) in Norwegian fjords, plankton tows were conducted in south-western and northern Norwegian fjords in September 2016. The mean total abundance of radiolarians was 306 m–3 in the Sognefjord complex, which was the southern research site, and, in the north, 945 m–3 in Malangen and 89 m–3 in Balsfjord, both above the Arctic Circle. Sticholonche zanclea was the most abundant radiolarian in the Sognefjord complex and Malangen, accounting for 78–100% (mean 89%) of radiolarian abundance. The mean total abundance of phaeodarians was 1554 m–3 in the Sognefjord complex, 51 m–3 in Malangen and 11 m–3 in Balsfjord. Medusetta arcifera was the most abundant phaeodaria in the Sognefjord complex, accounting for >99% of phaeodarian abundance, but was absent in Malangen and Balsfjord, where Protocystis tridens accounted for >96% of phaeodarian abundance. The carbon biomass of S. zanclea and M. arcifera was 188 and 438 µg C m–3, respectively, which is similar to and 8.6 times higher than, respectively, that of phaeodarians >1 mm in the western North Pacific, suggesting that M. arcifera contributes to organic carbon transport in the Sognefjord complex. Amphimelissa setosa (Nassellaria, Radiolaria), which was a dominant species in the study area in 1982–83, was absent in the present study in all sampled fjords. This could have been caused by the approximately 2 °C increase in water temperature that has occurred since 1990 and can be taken as evidence of a climate-change-associated local temperature rise linked to the warming of advected Atlantic Water.","PeriodicalId":49684,"journal":{"name":"Polar Research","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136131115","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

Variability of biothermal conditions in the vicinity of the Polish Antarctic station in the South Shetlands, West Antarctica 南极西部南设得兰群岛波兰南极站附近双温条件的变化

IF 1.9 4区地球科学

Polar Research Pub Date : 2023-08-22 DOI: 10.33265/polar.v42.9108

J. Plenzler, K. Piotrowicz, Weronika Rymer, T. Budzik

{"title":"Variability of biothermal conditions in the vicinity of the Polish Antarctic station in the South Shetlands, West Antarctica","authors":"J. Plenzler, K. Piotrowicz, Weronika Rymer, T. Budzik","doi":"10.33265/polar.v42.9108","DOIUrl":"https://doi.org/10.33265/polar.v42.9108","url":null,"abstract":"There are nine year-round and 11 seasonal scientific stations in the South Shetland Islands, an area often visited by cruise ships and sailing yachts. Although this is the warmest part of Antarctica, the weather conditions may be demanding for humans. We analysed the variability of biothermal conditions near Henryk Arctowski Station Polish Antarctic Station, on King George Island, during the period 2013–2021, using the wind chill index (WCI), which combines air temperature and wind speed, to determine thermal sensation. WCI values were interpreted using two cold sensation categorisations. Hourly WCI values were assigned to thermal sensation classes that ranged from “comfortable” to “frosty.” The most favourable biothermal conditions occurred from December to February. The “cold” sensation was dominant in all months, its average occurrence frequency ranging from 56.4% (in January) to 84.4% (in July). From November to March, there was no risk of frostbite to uncovered body parts. Such conditions occurred only from April to October, with a frequency of 0.2–6.8%; biothermal conditions were also the most variable in this period. Maximal WCI hourly values show that dangerous weather conditions may occur throughout the day in June and for most of the day from July to September. An abrupt change in biothermal conditions was more often caused by wind speed change than by air temperature change. The most marked WCI changes occurred from April to September, on average five times per year. Our results indicate that biothermal conditions in the vicinity of Arctowski Station are predominantly favourable for outdoor work only if a person wears proper winter clothing.","PeriodicalId":49684,"journal":{"name":"Polar Research","volume":" ","pages":""},"PeriodicalIF":1.9,"publicationDate":"2023-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42767242","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

First observations of emperor penguins on Horseshoe Island, Antarctica 首次在南极洲马蹄岛观察到帝企鹅

IF 1.9 4区地球科学

Polar Research Pub Date : 2023-07-31 DOI: 10.33265/polar.v42.9556

Sinan Yi̇rmi̇beşoğlu, Burcu Ozsoy

引用次数: 0

Observations of bowhead whales in west Greenland during summer 夏季对西格陵兰弓头鲸的观察

IF 1.9 4区地球科学

Polar Research Pub Date : 2023-07-20 DOI: 10.33265/polar.v42.9436

D. Boertmann, K. Raundrup, J. Nymand, J. Fritt-Rasmussen, Kasper L. Johansen

引用次数: 0

Review of Footsteps in the snow, by John Dudeney (2022). Dunbeath, Scotland: Whittles Publishing. 256 pp. ISBN: 978-184995-539-3. 《雪地里的脚步》，约翰·杜德尼著（2022）。Dunbeath，苏格兰：Whittles出版社。256页，国际标准书号：978-184995-539-3。