Polar Science最新文献

Characterizing Antarctic air-breathing predator dive patterns on a common prey base from stationary echosounders 利用固定回声探测仪在一个共同的猎物基地上描绘南极呼吸式捕食者的潜水模式

IF 1.8 4区地球科学

Polar Science Pub Date : 2024-03-01 DOI: 10.1016/j.polar.2023.100974

Pavanee Annasawmy , John K. Horne , Christian S. Reiss , Gavin J. Macaulay

{"title":"Characterizing Antarctic air-breathing predator dive patterns on a common prey base from stationary echosounders","authors":"Pavanee Annasawmy , John K. Horne , Christian S. Reiss , Gavin J. Macaulay","doi":"10.1016/j.polar.2023.100974","DOIUrl":"10.1016/j.polar.2023.100974","url":null,"abstract":"<div>Diving patterns of air-breathing predators were monitored from three moored subsurface upward-looking echosounders. Complete and partial dive profiles were visible on active acoustic records as echoes that started and/or returned to the surface. Dive metrics: maximum dive depths, durations, and wiggle count were measured and angles, distances, and velocities, were calculated at each site. Dive shapes ‘U’, ‘V’ and ‘W’ were derived using the number of wiggles and the percentage of dive bottom time. Dive profiles were classified into four types with type 1 dives being short in total duration and distance, low velocities, small angles, shallow, and linked to ‘U’ and ‘W’ shapes. Type 2 dives were short in distance, had low velocities, shallow depths, and were linked to ‘V’ dives. Dive types 3 and 4 had higher velocities, larger angles, longer total durations, and were deeper than types 1 and 2. Observed dive types could correspond to travelling, exploring, and foraging predator behaviors. Significant predator-prey overlaps occurred with predator dive profile counts correlated with krill aggregation thickness, density, and depth. This study demonstrates the utility of using stationary active acoustics to identify predator dive profiles with a simultaneous characterization of the potential prey field.</div>","PeriodicalId":20316,"journal":{"name":"Polar Science","volume":"39 ","pages":"Article 100974"},"PeriodicalIF":1.8,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S1873965223000725/pdfft?md5=41fc6494f7d29de28a606a26371056ee&pid=1-s2.0-S1873965223000725-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46997141","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

Reconstruct the AMSR-E/2 thin ice thickness algorithm to create a long-term time series of sea-ice production in Antarctic coastal polynyas 重建AMSR-E/2薄冰厚度算法，建立南极海岸冰融区海冰生成的长期时间序列

IF 1.8 4区地球科学

Polar Science Pub Date : 2024-03-01 DOI: 10.1016/j.polar.2023.100978

Sohey Nihashi , Kay I. Ohshima , Takeshi Tamura

{"title":"Reconstruct the AMSR-E/2 thin ice thickness algorithm to create a long-term time series of sea-ice production in Antarctic coastal polynyas","authors":"Sohey Nihashi , Kay I. Ohshima , Takeshi Tamura","doi":"10.1016/j.polar.2023.100978","DOIUrl":"10.1016/j.polar.2023.100978","url":null,"abstract":"<div>This study presented an extended time series of ice production in Antarctic coastal polynyas for 20 years of 2002–21 using high spatial resolution satellite data from passive microwave sensors: the Advanced Microwave Scanning Radiometer for EOS (AMSR-E) and the Advanced Microwave Scanning Radiometer 2 (AMSR2). For this, we reconstructed the previously presented thin ice thickness algorithms and re-estimated ice production by replacing atmospheric input data for the heat flux calculations with the newly released ECMWF Reanalysis v5 (ERA5). The consistency of ice production between AMSR-E and AMSR2, whose operation periods do not overlap, was confirmed from comparisons with ice production by the Special Sensor Microwave/Imager (SSM/I) and the Special Sensor Microwave Imager Sounder (SSMIS) with relatively coarse spatial resolution. The open ocean area, which cannot be detected from the thin ice thickness algorithm, was defined using sea-ice concentration (SIC) from AMSR-E and AMSR2. The satellite derived SIC has been suggested to be underestimated in the new thin ice (polynya) area. The effect of the underestimation on the ice production estimation was evaluated. The underestimation of SIC from three major algorithms was also investigated from comparisons with the thin ice thickness presented in this study. The coastal polynya dataset covering 20 years with the higher spatial resolution presented in this study is vital for climate-change-related studies.</div>","PeriodicalId":20316,"journal":{"name":"Polar Science","volume":"39 ","pages":"Article 100978"},"PeriodicalIF":1.8,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S1873965223000762/pdfft?md5=8c0ddd9a59863f7e45824e8733125115&pid=1-s2.0-S1873965223000762-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46740867","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

Climatology of quiet time geomagnetic field variations at two locations in Antarctica 南极两个地点静时地磁场变化的气候学

IF 1.8 4区地球科学

Polar Science Pub Date : 2023-12-01 DOI: 10.1016/j.polar.2023.100979

Geeta Vichare, Atul Kulkarni, Rahul Rawat, Gopi K. Seemala, Anoop K. Soman, Pritimay Patro

{"title":"Climatology of quiet time geomagnetic field variations at two locations in Antarctica","authors":"Geeta Vichare, Atul Kulkarni, Rahul Rawat, Gopi K. Seemala, Anoop K. Soman, Pritimay Patro","doi":"10.1016/j.polar.2023.100979","DOIUrl":"10.1016/j.polar.2023.100979","url":null,"abstract":"<div>During geomagnetic quiet conditions, Indian Antarctic stations are considered to be located outside the auroral oval: Maitri (CGM coordinates: 63.3°S, 54.2°E) is equatorward and Bharati (CGM coordinates: 74.8°S, 98.4°E) is poleward of the auroral oval. Simultaneous observations of magnetic field variations at these two locations for 10-years (2013–2022) provide an opportunity to study quiet-time magnetic field patterns, if any. Geomagnetic quiet days with ΣKp ≤ 3 are selected, during which the lower values of solar wind and interplanetary parameters are also confirmed. Maitri station exhibits clear southern hemispheric solar quiet (Sq) type of magnetic field variation on geomagnetic quiet days in all seasons, indicating the influence of ionospheric dynamo due to thermospheric winds. Interestingly, Bharati station also displays regular and systematic magnetic field variations in all three components. The D-component at Bharati exhibits very strong variation at early morning hours (7–8 MLT), which is ∼2–4 times stronger than that of H-component, driving strong equatorward/northward currents during all seasons. Both stations show annual type of seasonal variation with peak amplitude during summer and least during winter. The schematic illustration of global and polar Sqs proposed here explains the results obtained through 10-years’ statistical study.</div>","PeriodicalId":20316,"journal":{"name":"Polar Science","volume":"38 ","pages":"Article 100979"},"PeriodicalIF":1.8,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42810716","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

High-resolution insights of physical properties of water columns of lakes at the Larsemann Hills, East Antarctica 对南极洲东部Larsemann山湖泊水柱物理性质的高分辨率见解

IF 1.8 4区地球科学

Polar Science Pub Date : 2023-12-01 DOI: 10.1016/j.polar.2023.100983

Cheryl A. Noronha-D’Mello, B.S. Mahesh, Jenson George, Shramik Patil, Avirajsinh Jadav, Rahul Mohan

{"title":"High-resolution insights of physical properties of water columns of lakes at the Larsemann Hills, East Antarctica","authors":"Cheryl A. Noronha-D’Mello, B.S. Mahesh, Jenson George, Shramik Patil, Avirajsinh Jadav, Rahul Mohan","doi":"10.1016/j.polar.2023.100983","DOIUrl":"10.1016/j.polar.2023.100983","url":null,"abstract":"<div>During the Austral summer of 2022, a study was conducted to investigate the physical properties of six lakes in the Larsemann Hills, East Antarctica. The lake water column's key properties, viz. temperature, salinity, density, fluorescence, and depth, were examined using a CTD profiler to establish a high-resolution description of their variations and identify the factors influencing intra and inter-lake variations. The results indicated that the shallow lakes LH14, LH04, and Discussion were well mixed. Lakes LH04 and LH14 on Stornes were affected by salinity, likely sea spray. In contrast, the deeper lakes, namely Nella, Cameron and Progress, were primarily driven by temperature and density dynamics. The hydrological characteristics of Cameron and Progress were notably impacted by their proximity to the ice sheet, while Nella was influenced by the presence of a partial lake ice cover. The lake depth, geographical location and presence of ice cover in the catchment significantly influenced temperature and salinity variations within the lakes. Deep lakes may be more sensitive to changes in temperature and density as compared to shallow lakes and could potentially affect other physical lake parameters. This baseline information is a valuable reference for future investigations on these lakes and similar environments.</div>","PeriodicalId":20316,"journal":{"name":"Polar Science","volume":"38 ","pages":"Article 100983"},"PeriodicalIF":1.8,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42937311","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

Surface mass balance calculation with ground observation in the sub-basin of Larsemann Hills, East Antarctica 东南极洲Larsemann Hills次盆地地表物质平衡的地面观测计算

IF 1.8 4区地球科学

Polar Science Pub Date : 2023-12-01 DOI: 10.1016/j.polar.2023.100981

Surendra Jat, Mohammad Sadiq, Pradeep Kumar, Abhishek Verma, Deepak Y Gajbhiye

{"title":"Surface mass balance calculation with ground observation in the sub-basin of Larsemann Hills, East Antarctica","authors":"Surendra Jat, Mohammad Sadiq, Pradeep Kumar, Abhishek Verma, Deepak Y Gajbhiye","doi":"10.1016/j.polar.2023.100981","DOIUrl":"10.1016/j.polar.2023.100981","url":null,"abstract":"<div>The study includes ground-based data of surface mass balance calculations to assess the input of climate change on the ice sheet health. The study covers an approximately 471 km2 area of the ice sheet that lies in between the Dålk and Polarårboken glaciers, Larsemann Hills, Prince Elizabeth, East Antarctica. Snow accumulation/ablation data is collected from 13 stake networks and 06 single stakes installed on the ice sheet. The monitored area is extrapolated on the basis of elevation and glaciological parameters using ArcGIS 10.8.1. The exposed height and precise locations of stakes have been recorded using DGPS and compared with the preceeding year's datasets. The annual measure accumulation/ablation data is processed in ArcGIS for the estimation of surface mass balance since 2018. The accumulation/ablation rate of the ice sheet is not uniform and influenced by the meteorological parameters i.e. temperature, precipitation and wind speed. The values of net surface mass balance are 0.027 Gt yr−1, 0.088 Gt yr−1, 0.044 Gt yr−1, and 0.026 Gt yr−1 since 2018 to 2021 respectively.</div>","PeriodicalId":20316,"journal":{"name":"Polar Science","volume":"38 ","pages":"Article 100981"},"PeriodicalIF":1.8,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44085147","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

Larsemann Hills: Geomorphometric modeling and mapping Larsemann Hills:地貌学建模和制图

IF 1.8 4区地球科学

Polar Science Pub Date : 2023-12-01 DOI: 10.1016/j.polar.2023.100969

I.V. Florinsky

{"title":"Larsemann Hills: Geomorphometric modeling and mapping","authors":"I.V. Florinsky","doi":"10.1016/j.polar.2023.100969","DOIUrl":"10.1016/j.polar.2023.100969","url":null,"abstract":"<div>Geomorphometric modeling is widely used in geosciences. However, geomorphometric modeling and mapping of Antarctic oases has not been performed so far. This article presents the first results of our work on geomorphometric modeling and mapping of the Larsemann Hills obtained in the frameworks of the 68th Russian Antarctic Expedition in January–April 2023. As input data, we used a fragment of the Reference Elevation Model of Antarctica (REMA). From the extracted and edited digital elevation model, we derived digital models and maps of the following 17 morphometric variables: slope, aspect, horizontal curvature, vertical curvature, mean curvature, Gaussian curvature, minimal curvature, maximal curvature, unsphericity curvature, difference curvature, vertical excess curvature, horizontal excess curvature, ring curvature, accumulation curvature, catchment area, topographic index, and stream power index. We also conducted a field geomorphometric interpretation work to provide correct physical geographic, geological, and geomorphological interpretations of morphometric maps. In the fieldwork, we carried out 54 foot routes with the total length of about 422 km. During the routes, we collected 150 rock samples for further petrological and mineralogical analyses as well as three-dimensional modeling of the samples. Derived morphometric maps can be useful for structural geological and process-oriented hydrological studies. The ultimate goal of the ongoing work is to create a large-scale geomorphometric atlas of Antarctic oases and other ice-free Antarctic territories.</div>","PeriodicalId":20316,"journal":{"name":"Polar Science","volume":"38 ","pages":"Article 100969"},"PeriodicalIF":1.8,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49255978","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

Mapping lichen abundance in ice-free areas of Larsemann Hills, East Antarctica using remote sensing and lichen spectra 利用遥感和地衣光谱绘制南极洲东部拉尔森山无冰区地衣丰度图

IF 1.8 4区地球科学

Polar Science Pub Date : 2023-12-01 DOI: 10.1016/j.polar.2023.100976

Chandra Prakash Singh , Harsh Joshi , Dhruvkumar Kakadiya , Malay S. Bhatt , Rajesh Bajpai , Ramya Ranjan Paul , D.K. Upreti , Shailendra Saini , Mirza Javed Beg , Anant Pande , Naveen Tripathi , Kiledar Singh Tomar , Sandip R. Oza , Mehul R. Pandya , Bimal K. Bhattacharya

{"title":"Mapping lichen abundance in ice-free areas of Larsemann Hills, East Antarctica using remote sensing and lichen spectra","authors":"Chandra Prakash Singh , Harsh Joshi , Dhruvkumar Kakadiya , Malay S. Bhatt , Rajesh Bajpai , Ramya Ranjan Paul , D.K. Upreti , Shailendra Saini , Mirza Javed Beg , Anant Pande , Naveen Tripathi , Kiledar Singh Tomar , Sandip R. Oza , Mehul R. Pandya , Bimal K. Bhattacharya","doi":"10.1016/j.polar.2023.100976","DOIUrl":"10.1016/j.polar.2023.100976","url":null,"abstract":"<div>Lichen communities are known to be most resistant and adapted organisms to the extreme environments; however, their abundance is not well mapped. Extensive lichen surveys were conducted as part of the 39th Indian scientific expedition and in-situ spectra (350 nm–2500 nm) of lichens were collected in the Larsemann Hills, East Antarctica during austral summer of 2020. Lichen abundance mapping was carried out with the help of Sentinel-2 MSI L2 data and surveyed records along with in-situ spectra. We generated feature collections for lichen, snow, water, bare surface and trained a random forest (RF) classification algorithms implemented in GEE and generated multi-class outputs. We finally merged all non-lichen classes and produced binary pixels with a confidence value (between 0 and 100) depicting similarity of its spectral response to that of a lichen pixel. Total 92 lichen points, 20 bare rock points, 26 points of water and 74 snow points were used to generate the probabilistic lichen abundance map. Resubstitution accuracy of 97.31% was obtained with 10 number of RF trees. Validation was done with geotagged ground photographs having 232 lichens, 20 bare rocks, 22 water and 69 snow points and achieved test accuracy of 82.44%.</div>","PeriodicalId":20316,"journal":{"name":"Polar Science","volume":"38 ","pages":"Article 100976"},"PeriodicalIF":1.8,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41882155","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

A broadband seismological observatory at Larsemann Hills, Antarctica: Noise characteristics and data quality 南极洲拉尔森山宽带地震观测站:噪声特征和数据质量

IF 1.8 4区地球科学

Polar Science Pub Date : 2023-12-01 DOI: 10.1016/j.polar.2023.100970

Padma Rao B, Krishna Jha, Suresh Kumar Thatikonda

{"title":"A broadband seismological observatory at Larsemann Hills, Antarctica: Noise characteristics and data quality","authors":"Padma Rao B, Krishna Jha, Suresh Kumar Thatikonda","doi":"10.1016/j.polar.2023.100970","DOIUrl":"10.1016/j.polar.2023.100970","url":null,"abstract":"<div>Antarctica, the southernmost ice-covered continent, plays a pivotal role in unraveling Earth's intricate evolutionary processes. Several studies have been conducted to comprehend the crustal structure of West Antarctica. However, our understanding of the sub-surface structure in the East Antarctica region, particularly along Princess Elizabeth Land (PEL), remains limited due to the scarcity of geophysical data. To bridge this knowledge gap, we (NCESS) established a permanent broadband seismological observatory in the captivating region of Larsemann Hills, East Antarctica. In addition, we investigate the noise characteristics at the station, employing power spectral density (PSD) measurements. Results have been promising, indicating that the noise levels are within the range of New High Noise Model and New Low Noise Model. Monthly variations in PSD reveal different noise levels throughout the year, with winter months exhibiting lower levels of microseismic noise attributed to lower temperatures and frozen sea surfaces. The long-period noise is higher in April & May, possibly due to high-speed winds and lower in September & October. The outcomes serve as a testament to the success of our installation and ensure a valuable data set. The data will contribute to a comprehensive investigation of sub-surface structures in the PEL region of East Antarctica, enhancing our understanding of geological processes and tectonic evolution. Furthermore, the findings will serve as a valuable resource for future research and contribute to our knowledge of Earth's dynamic processes.</div>","PeriodicalId":20316,"journal":{"name":"Polar Science","volume":"38 ","pages":"Article 100970"},"PeriodicalIF":1.8,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43967867","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

Year-long ground-based observations of bromine oxide over Bharati Station, Antarctica 南极巴拉蒂站上空溴氧化物的一年地面观测

IF 1.8 4区地球科学

Polar Science Pub Date : 2023-12-01 DOI: 10.1016/j.polar.2023.100977

Shrutika P. Wagh , Sankirna D. Joge , Surendra Singh , Prithviraj Mali , Steffen Beirle , Thomas Wagner , Silvia Bucci , Alfonso Saiz-Lopez , Rohini Bhawar , Anoop S. Mahajan

{"title":"Year-long ground-based observations of bromine oxide over Bharati Station, Antarctica","authors":"Shrutika P. Wagh , Sankirna D. Joge , Surendra Singh , Prithviraj Mali , Steffen Beirle , Thomas Wagner , Silvia Bucci , Alfonso Saiz-Lopez , Rohini Bhawar , Anoop S. Mahajan","doi":"10.1016/j.polar.2023.100977","DOIUrl":"10.1016/j.polar.2023.100977","url":null,"abstract":"<div>Bromine chemistry plays an important role in tropospheric ozone depletion events in polar regions. Autocatalytic reactions lead to bromine explosion events, causing ozone depletion to near-zero levels in the polar troposphere. Bromine chemistry over Antarctica is not fully understood, and ground-based observations are scarce. This work presents year-long observations of bromine oxide (BrO) over the Bharati station (69.41°S, 76.19°E) using Multi-axis Differential Optical Absorption Spectroscopy (MAX-DOAS) from December 2018 to February 2020. The results show that elevated BrO mixing ratios were found during spring (September), with a maximum value of 10.21 ± 4.38 pptv for clear sky conditions and 33.15 ± 2.23 pptv for cloudy conditions. BrO was not observed above the detection limit (∼3 × 1013 molecule cm−2) outside spring on clear days. In general, lower mixing ratios were observed on clear days over Bharati compared to stations in West Antarctica. This indicates a different source strength over East Antarctica compared to West Antarctica. BrO vertical column densities were high during spring, with a maximum value of 1.34 ± 0.35 × 1014 molecule cm−2. The vertical profiles of the BrO mixing ratios show a peak at the surface during spring (average of 6.5 ± 1.91 pptv), decreasing sharply with altitude. Back trajectories show that air masses passing over the first year ice showed higher BrO, although factors such as meteorology play an important role in determining the absolute levels. Using a box model, we show that bromine chemistry can deplete as much as 2.15 ppb of ozone in a day at the Bharati Station on clear days, which shows that it does not lead to complete ozone depletion events over Bharati.</div>","PeriodicalId":20316,"journal":{"name":"Polar Science","volume":"38 ","pages":"Article 100977"},"PeriodicalIF":1.8,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42014582","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

Mineral magnetic properties of surface soils from the Broknes and Grovnes Peninsula, Larsemann Hills, East Antarctica 南极东部Larsemann山Broknes和Grovnes半岛表层土壤的矿物磁性

IF 1.8 4区地球科学

Polar Science Pub Date : 2023-12-01 DOI: 10.1016/j.polar.2023.100968

G.S. Joju , Anish Kumar Warrier , Marcos A.E. Chaparro , B.S. Mahesh , Freddy Abraham Matthew , S. Anusree , Rahul Mohan

{"title":"Mineral magnetic properties of surface soils from the Broknes and Grovnes Peninsula, Larsemann Hills, East Antarctica","authors":"G.S. Joju , Anish Kumar Warrier , Marcos A.E. Chaparro , B.S. Mahesh , Freddy Abraham Matthew , S. Anusree , Rahul Mohan","doi":"10.1016/j.polar.2023.100968","DOIUrl":"10.1016/j.polar.2023.100968","url":null,"abstract":"<div>This study presents the mineral magnetic, particle size, and organic content data of surface soils from Larsemann Hills, East Antarctica. The analysis of isothermal remanent magnetization and the high specific magnetic susceptibility values –mean (±S.D.) values of 117.7 (±175.0) × 10−8m3kg−1 for Broknes Peninsula and of 330.9 (±217.4) × 10−8m3kg−1 for Grovnes Peninsula– indicate high concentrations of low-coercivity magnetic minerals. The magnetic minerals are coarse-grained in the multidomain and pseudo-single domain range, and the significant correlation between some magnetic parameters suggests the dominant control of multidomain grains. The remanent acquisition coercivity H1/2 shows mean (±S.D.) values of 38.2 (±4.9) for Broknes and 38.3 (±3.7) mT for Grovnes soils suggesting magnetite dominance. The soils lie in the sand and loamy sand textural classes, and the concentration of organic matter is very low. Values of percentage frequency-dependent susceptibility indicate insignificant proportions of superparamagnetic grains, and therefore no significant evidence for pedogenic magnetic minerals was observed in these soils. The magnetic signal of Larsemann Hills soils was primarily terrigenous with no contributions from bacterial magnetite, authigenic greigite and anthropogenic magnetic minerals.</div>","PeriodicalId":20316,"journal":{"name":"Polar Science","volume":"38 ","pages":"Article 100968"},"PeriodicalIF":1.8,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45805308","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