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  • A stratigraphy-based method for reconstructing ice core orientation
    Ann. Glaciol. (IF 2.318) Pub Date : 2020-11-11
    Julien Westhoff; Nicolas Stoll; Steven Franke; Ilka Weikusat; Paul Bons; Johanna Kerch; Daniela Jansen; Sepp Kipfstuhl; Dorthe Dahl-Jensen

    Ever since the first deep ice cores were drilled, it has been a challenge to determine their original, in-situ orientation. In general, the orientation of an ice core is lost as the drill is free to rotate during transport to the surface. For shallow ice cores, it is usually possible to match the adjacent core breaks, which preserves the orientation of the ice column. However, this method fails for

    更新日期:2020-11-12
  • Hot water drilling in the firn layer of Greenland's percolation zone
    Ann. Glaciol. (IF 2.318) Pub Date : 2020-11-05
    Neil Humphrey; Joel Harper; Toby Meierbachtol

    The intermixed thermal and structural framework of cold firn, water-saturated firn and ice layers in Greenland's percolation zone can be challenging to penetrate with core drills. Here, we present our experiences using a hot water drill for research on the firn layer of the percolation zone. We built and deployed a lightweight and easily transportable system for drilling a transect of ~15 cm diameter

    更新日期:2020-11-05
  • Adaptation of the Winkie Drill for subglacial bedrock sampling
    Ann. Glaciol. (IF 2.318) Pub Date : 2020-11-03
    Grant V. Boeckmann; Chris J. Gibson; Tanner W. Kuhl; Elliot Moravec; Jay A. Johnson; Zack Meulemans; Kristina Slawny

    The Winkie Drill is an agile, commercially available rock coring system. The U.S. Ice Drilling Program has modified a Winkie Drill for subglacial rock and ice/rock interface coring, as well as drilling and coring access holes through ice. The original gasoline engine was replaced with an electric motor though the two-speed gear reducer and Unipress hand feed system were maintained. Using standard aluminum

    更新日期:2020-11-03
  • New synthetic fiber armored cable for freezing-in thermal ice probes
    Ann. Glaciol. (IF 2.318) Pub Date : 2020-11-03
    Nan Zhang; Hui Liu; Pavel Talalay; Youhong Sun; Na Li; Xiaopeng Fan; Bing Li; Da Gong; Jialin Hong; Ting Wang; An Liu; Yazhou Li; Yunchen Liu; Rusheng Wang; Yang Yang; Liang Wang

    A series of new synthetic armored cables were developed and tested to ensure that they were suitable for use with the RECoverable Autonomous Sonde (RECAS), which is a newly designed freezing-in thermal ice probe. The final version of the cable consists of two concentric conductors that can be used as the power and signal lines. Two polyfluoroalkoxy jackets are used for electrical insulation (one for

    更新日期:2020-11-03
  • RAM-2 Drill system development: an upgrade of the Rapid Air Movement Drill
    Ann. Glaciol. (IF 2.318) Pub Date : 2020-11-03
    Christopher Gibson; Grant Boeckmann; Zachary Meulemans; Tanner Kuhl; Jim Koehler; Jay Johnson; Kristina Slawny

    Significant upgrades to the Rapid Air Movement (RAM) Drill were developed and tested by the US Ice Drilling Program in 2016 through 2020 for the U.S. National Science Foundation. The design of the system leverages the existing infrastructure of the RAM Drill with the goal of greatly reducing the logistical burden of deploying the drill while maintaining the ability to drill an access hole in firn and

    更新日期:2020-11-03
  • The plate spacing of sea ice
    Ann. Glaciol. (IF 2.318) Pub Date : 2020-10-27
    Sönke Maus

    Columnar sea ice grows with an interface of tiny parallel ice plates, the distance of which is known as plate spacing. While it has been proposed as a fundamental microstructure scale of sea ice, the physics behind its formation has not been fully understood. Here the problem is analysed on the basis of morphological stability theory to propose a model that results in a physically consistent prediction

    更新日期:2020-10-30
  • Changing ice and changing light: trends in solar heat input to the upper Arctic ocean from 1988 to 2014
    Ann. Glaciol. (IF 2.318) Pub Date : 2020-10-19
    Donald Perovich; Bonnie Light; Suzanne Dickinson

    The Arctic sea-ice cover has undergone a significant decline in recent decades. The melt season is starting earlier, ice is thinner and seasonal ice dominates. Here we examine the effects of these changes on the solar heat input to the upper ocean in ice-covered Arctic waters from 1985 to 2014. Satellite observations of ice concentration, onset dates of melt and freeze-up and ice age, are combined

    更新日期:2020-10-19
  • Design and analysis of deepwater tension sensors for ice drill application
    Ann. Glaciol. (IF 2.318) Pub Date : 2020-10-15
    Jianguang Shi; Shengmiao Huang; Binyan Wang; Chong Li; Shilin Peng; Youhong Sun; Pavel Talalay; Haibin Yu

    Monitoring the tension in cables is significant in some ice drill and deepwater applications. Take our RECoverable Autonomous Sonde (RECAS) for example. It is able to melt a hole to the bottom of ice sheet and is able to move upwards. A winch is installed inside RECAS to release and recover the cable, whose tension needs to be monitored in real time in order to control the behavior of the winch. The

    更新日期:2020-10-15
  • Avoiding slush for hot-point drilling of glacier boreholes
    Ann. Glaciol. (IF 2.318) Pub Date : 2020-10-12
    Benjamin H. Hills; Dale P. Winebrenner; W. T. Elam; Paul M. S. Kintner

    Water-filled boreholes in cold ice refreeze in hours to days, and prior attempts to keep them open with antifreeze resulted in a plug of slush effectively freezing the hole even faster. Thus, antifreeze as a method to stabilize hot-water boreholes has largely been abandoned. In the hot-point drilling case, no external water is added to the hole during drilling, so earlier antifreeze injection is possible

    更新日期:2020-10-12
  • Platelet ice, the Southern Ocean's hidden ice: a review
    Ann. Glaciol. (IF 2.318) Pub Date : 2020-10-12
    Mario Hoppmann; Maren E. Richter; Inga J. Smith; Stefan Jendersie; Patricia J. Langhorne; David N. Thomas; Gerhard S. Dieckmann

    Basal melt of ice shelves is not only an important part of Antarctica's ice sheet mass budget, but it is also the origin of platelet ice, one of the most distinctive types of sea ice. In many coastal Antarctic regions, ice crystals form and grow in supercooled plumes of Ice Shelf Water. They usually rise towards the surface, becoming trapped under an ice shelf as marine ice or forming a semi-consolidated

    更新日期:2020-10-12
  • Agile Sub-Ice Geological (ASIG) Drill development and Pirrit Hills field project
    Ann. Glaciol. (IF 2.318) Pub Date : 2020-10-07
    Tanner Kuhl; Chris Gibson; Jay Johnson; Grant Boeckmann; Elliot Moravec; Kristina Slawny

    A new drilling system was developed by the US Ice Drilling Program (IDP) to rapidly drill through overlying ice to collect subglacial rock cores. The Agile Sub-Ice Geological (ASIG) Drill system is capable of drilling up to 700 m of ice in a continuous manner. Intermittent ice core samples can be taken as needed. Ten-plus meters of subglacial bedrock and unconsolidated, frozen sediment cores can be

    更新日期:2020-10-07
  • The Autonomous Pinger Unit of the Acoustic Navigation Network in EnEx-RANGE: an autonomous in-ice melting probe with acoustic instrumentation
    Ann. Glaciol. (IF 2.318) Pub Date : 2020-10-07
    Lars Steffen Weinstock; Simon Zierke; Dmitry Eliseev; Peter Linder; Cornelius Vollbrecht; Dirk Heinen; Christopher Wiebusch

    The Autonomous Pinger Unit (APU) is an electro-thermal drill with acoustic instrumentation developed for the project EnEx-RANGE in view of a future space mission for the sub-surface exploration of Saturn's moon Enceladus. A main goal is the development of navigation technology for an acoustic guidance system allowing maneuvering a probe through glacial ice. In total 13 APUs were built and tested in

    更新日期:2020-10-07
  • Trends, abrupt shifts and interannual variability of the Arctic Wintertime Seasonal Sea Ice from 1979 to 2019
    Ann. Glaciol. (IF 2.318) Pub Date : 2020-10-05
    Guanghua Hao; Jie Su; Timo Vihma; Fei Huang

    The Arctic winter seasonal sea ice (WSSI) concentration from 1979 to 2019 is derived from passive microwave data. Based on Empirical Orthogonal Function (EOF) analysis, the WSSI time series includes regionally different trends, abrupt shifts and interannual variations. The time series of the first EOF mode (PC1) mainly represents the WSSI trend, which is characterized by an increase, particularly in

    更新日期:2020-10-05
  • Changes at the edge: trends in sea ice, ocean temperature and ocean color at the Northwest Atlantic/Southern Arctic interface
    Ann. Glaciol. (IF 2.318) Pub Date : 2020-09-24
    Ashley V. York; Karen E. Frey; Luisa N. C. Young

    Spatial and temporal trends of remotely sensed sea-ice cover, sea surface temperatures, chlorophyll-a concentration and primary production in the Baffin Bay, Davis Strait and Labrador Sea were analyzed for the 1998–2017 period. We found spatial variability in the trends of these cryospheric, biologic and oceanographic phenomena. For example, in the northern Baffin Bay, we observed decreases in annual

    更新日期:2020-09-24
  • Using under-ice hyperspectral transmittance to determine land-fast sea-ice algal biomass in Saroma-ko Lagoon, Hokkaido, Japan
    Ann. Glaciol. (IF 2.318) Pub Date : 2020-09-24
    Pat Wongpan; Daiki Nomura; Takenobu Toyota; Tomonori Tanikawa; Klaus M. Meiners; Tomomi Ishino; Tetsuya P. Tamura; Manami Tozawa; Yuichi Nosaka; Toru Hirawake; Atsushi Ooki; Shigeru Aoki

    Sea ice, which forms in polar and nonpolar areas, transmits light to ice-associated (sympagic) algal communities. To noninvasively study the distribution of sea-ice algae, empirical relations to estimate its biomass from under-ice hyperspectral irradiance have been developed in the Arctic and Antarctica but lack for nonpolar regions. This study examines relationships between normalised difference indices

    更新日期:2020-09-24
  • Impact of Arctic sea ice floe-scale anisotropy on airborne electromagnetic surveys
    Ann. Glaciol. (IF 2.318) Pub Date : 2020-09-14
    Jean Negrel; Dmitry V. Divine; Sebastian Gerland

    Airborne electromagnetic induction sensors have demonstrated their extensive capacities to measure sea-ice thickness distributions. However, biases can emerge when comparing these 1-D measurements to a broader 2-D regional scale due to the spatial anisotropy inherent to sea-ice cover. Automated processing of available sea-ice maps could significantly ease the decision on how to set up an optimised

    更新日期:2020-09-14
  • Drilling operations for the South Pole Ice Core (SPICEcore) project
    Ann. Glaciol. (IF 2.318) Pub Date : 2020-09-08
    Jay A. Johnson; Tanner Kuhl; Grant Boeckmann; Chris Gibson; Joshua Jetson; Zachary Meulemans; Kristina Slawny; Joseph M. Souney

    Over the course of the 2014/15 and 2015/16 austral summer seasons, the South Pole Ice Core project recovered a 1751 m deep ice core at the South Pole. This core provided a high-resolution record of paleoclimate conditions in East Antarctica during the Holocene and late Pleistocene. The drilling and core processing were completed using the new US Intermediate Depth Drill system, which was designed and

    更新日期:2020-09-08
  • Towards Bedmap Himalayas: development of an airborne ice-sounding radar for glacier thickness surveys in High-Mountain Asia
    Ann. Glaciol. (IF 2.318) Pub Date : 2020-07-01
    H. D. Pritchard; E. C. King; D. J. Goodger; M. McCarthy; C. Mayer; R. Kayastha

    The thickness of glaciers in High-Mountain Asia (HMA) is critical in determining when the ice reserve will be lost as these glaciers thin but is remarkably poorly known because very few measurements have been made. Through a series of ground-based and airborne field tests, we have adapted a low-frequency ice-penetrating radar developed originally for Antarctic over-snow surveys, for deployment as a

    更新日期:2020-09-02
  • Depth-dependent artifacts resulting from ApRES signal clipping
    Ann. Glaciol. (IF 2.318) Pub Date : 2020-07-28
    Irena Vaňková; Keith W. Nicholls; Surui Xie; Byron R. Parizek; Denis Voytenko; David M. Holland

    Several autonomous phase-sensitive radio-echo sounders (ApRES) were deployed at Greenland glaciers to investigate ice deformation. Different attenuation settings were tested and it was observed that, in the presence of clipping of the deramped ApRES signal, each setting produced a different result. Specifically, higher levels of clipping associated with lower attenuation produced an apparent linear

    更新日期:2020-09-02
  • ImpDAR: an open-source impulse radar processor
    Ann. Glaciol. (IF 2.318) Pub Date : 2020-06-29
    David A. Lilien; Benjamin H. Hills; Joshua Driscol; Robert Jacobel; Knut Christianson

    Despite widespread use of radio-echo sounding (RES) in glaciology and broad distribution of processed radar products, the glaciological community has no standard software for processing impulse RES data. Dependable, fast and collection-system/platform-independent processing flows could facilitate comparison between datasets and allow full utilization of large impulse RES data archives and new data

    更新日期:2020-09-02
  • Basal roughness of the East Antarctic Ice Sheet in relation to flow speed and basal thermal state
    Ann. Glaciol. (IF 2.318) Pub Date : 2020-09-02
    Olaf Eisen; Anna Winter; Daniel Steinhage; Thomas Kleiner; Angelika Humbert

    Basal motion of ice sheets depends in part on the roughness and material properties of the subglacial bed and the occurrence of water. To date, basal motion represents one of the largest uncertainties in ice-flow models. It is that component of the total flow velocity that can change most rapidly and can, therefore, facilitate rapid variations in dynamic behaviour. In this study, we investigate the

    更新日期:2020-09-02
  • Basal melting over Subglacial Lake Ellsworth and its catchment: insights from englacial layering
    Ann. Glaciol. (IF 2.318) Pub Date : 2020-07-14
    Neil Ross; Martin Siegert

    Deep-water ‘stable’ subglacial lakes likely contain microbial life adapted in isolation to extreme environmental conditions. How water is supplied into a subglacial lake, and how water outflows, is important for understanding these conditions. Isochronal radio-echo layers have been used to infer where melting occurs above Lake Vostok and Lake Concordia in East Antarctica but have not been used more

    更新日期:2020-09-02
  • Early predictors of seasonal Arctic sea-ice volume loss: the impact of spring and early-summer cloud radiative conditions
    Ann. Glaciol. (IF 2.318) Pub Date : 2020-08-27
    Michalea D. King; Dana E. Veron; Helga S. Huntley

    Clouds play an important role in the Arctic surface radiative budget, impacting the seasonal evolution of Arctic sea-ice cover. We explore the large-scale impacts of springtime and early summer (March through July) cloud and radiative fluxes on sea ice by comparing these fluxes to seasonal ice volume losses over the central Arctic basin, calculated for available observational years 2004–2007 (ICESat)

    更新日期:2020-08-27
  • Optimization of hot-water ice-coring drills
    Ann. Glaciol. (IF 2.318) Pub Date : 2020-08-25
    An Liu; Rusheng Wang; Yang Yang; Liang Wang; Xiao Li; Yazhou Li; Pavel Talalay

    Hot-water ice-coring drills are often used to recover ice core samples from desirable depths in conjunction with full-scale hot-water drilling systems. However, the recovered cores exhibit varying qualities. The coring performance of a hot-water ice-coring drill depends significantly on the structure of the coring drill head (nozzle angle, diameter and number). To discover the most significant factor

    更新日期:2020-08-25
  • Influence of glacial water and carbonate minerals on wintertime sea-ice biogeochemistry and the CO2 system in an Arctic fjord in Svalbard
    Ann. Glaciol. (IF 2.318) Pub Date : 2020-08-13
    Agneta Fransson; Melissa Chierici; Daiki Nomura; Mats A. Granskog; Svein Kristiansen; Tõnu Martma; Gernot Nehrke

    The effect of freshwater sources on wintertime sea-ice CO2 processes was studied from the glacier front to the outer Tempelfjorden, Svalbard, in sea ice, glacier ice, brine and snow. March–April 2012 was mild, and the fjord was mainly covered with drift ice, in contrast to the observed thicker fast ice in the colder April 2013. This resulted in different physical and chemical properties of the sea

    更新日期:2020-08-14
  • Analyzing the impact of CryoSat-2 ice thickness initialization on seasonal Arctic Sea Ice prediction
    Ann. Glaciol. (IF 2.318) Pub Date : 2020-07-27
    Richard Allard; E. Joseph Metzger; Neil Barton; Li Li; Nathan Kurtz; Michael Phelps; Deborah Franklin; Ole Martin Smedstad; Julia Crout; Pamela Posey

    Twin 5-month seasonal forecast experiments are performed to predict the September 2018 mean and minimum ice extent using the fully coupled Navy Earth System Prediction Capability (ESPC). In the control run, ensemble forecasts are initialized from the operational US Navy Global Ocean Forecasting System (GOFS) 3.1 but do not assimilate ice thickness data. Another set of forecasts are initialized from

    更新日期:2020-07-27
  • Antarctic subglacial drilling rig: Part II. Ice and Bedrock Electromechanical Drill (IBED) – CORRIGENDUM
    Ann. Glaciol. (IF 2.318) Pub Date : 2020-07-27
    Pavel Talalay; Xingchen Li; Nan Zhang; Xiaopeng Fan; Youhong Sun; Pinlu Cao; Rusheng Wang; Yang Yang; Yongwen Liu; Yunchen Liu; Wei Wu; Cheng Yang; Jialin Hong; Da Gong; Han Zhang; Xiao Li; Yunwang Chen; An Liu; Yazhou Li

    A new, modified version of the cable-suspended Ice and Bedrock Electromechanical Drill (IBED) was designed for drilling in firn, ice, debris-rich ice and rock. The upper part of the drill is almost the same for all drill variants and comprises four sections: cable termination, a slip-ring section, an antitorque system and an electronic pressure chamber. The lower part of the IBED comprises an auger

    更新日期:2020-07-27
  • Snow-ice contribution to the structure of sea ice in the Amundsen Sea, Antarctica
    Ann. Glaciol. (IF 2.318) Pub Date : 2020-07-23
    Lijun Tian; Yongli Gao; Blake Weissling; Stephen F. Ackley

    The widespread occurrence of snow-ice formation on the pack ice plays a critical role in the mass balance of Antarctic sea ice. The stable isotope composition, ice texture and salinity of eight ice cores, obtained from the Amundsen Sea during the Oden Southern Ocean 2010/11 expedition from late December 2010 to January 2011, were investigated to illustrate the snow-ice growth process and its contribution

    更新日期:2020-07-23
  • Air/snow, snow/ice and ice/water interfaces detection from high-resolution vertical temperature profiles measured by ice mass-balance buoys on an Arctic lake
    Ann. Glaciol. (IF 2.318) Pub Date : 2020-07-22
    Yubing Cheng; Bin Cheng; Fei Zheng; Timo Vihma; Anna Kontu; Qinghua Yang; Zeliang Liao

    Snow and ice were monitored by thermistor-string-based Snow and Ice Mass Balance Array (SIMBA) in Lake Orajärvi in northern Finland. An existing automatic SIMBA-algorithm was further developed to derive air/snow, snow/ice and ice/water interfaces based on the SIMBA environment temperature (ET) profiles. The identified interfaces agreed with in situ observations made in 2011/12 winter season. The method

    更新日期:2020-07-22
  • Solidification effects of snowfall on sea-ice freeze-up: results from an onsite experimental study
    Ann. Glaciol. (IF 2.318) Pub Date : 2020-07-14
    Takenobu Toyota; Takashi Ono; Tomonori Tanikawa; Pat Wongpan; Daiki Nomura

    Although the effects of snow during sea-ice growth have been investigated for sea ice which is thick enough to accommodate dry snow, those for thin sea ice have not been paid much attention due to the difficulty in observing them. Observations are complicated by the presence of slush and its subsequent freeze-up, and the surface heat budget might be sensitive to the additional ice thickness. An onsite

    更新日期:2020-07-14
  • Fast Ice Prediction System (FIPS) for land-fast sea ice at Prydz Bay, East Antarctica: an operational service for CHINARE
    Ann. Glaciol. (IF 2.318) Pub Date : 2020-07-09
    Jiechen Zhao; Bin Cheng; Timo Vihma; Petra Heil; Fengming Hui; Qi Shu; Lin Zhang; Qinghua Yang

    A Fast Ice Prediction System (FIPS) was constructed and is the first regional land-fast sea-ice forecasting system for the Antarctic. FIPS had two components: (1) near-real-time information on the ice-covered area from MODIS and SAR imagery that revealed, tidal cracks, ridged and rafted ice regions; (2) a high-resolution 1-D thermodynamic snow and ice model (HIGHTSI) that was extended to perform a

    更新日期:2020-07-09
  • Characterizing winter landfast sea-ice surface roughness in the Canadian Arctic Archipelago using Sentinel-1 synthetic aperture radar and the Multi-angle Imaging SpectroRadiometer
    Ann. Glaciol. (IF 2.318) Pub Date : 2020-07-08
    Rebecca A. Segal; Randall K. Scharien; Silvie Cafarella; Andrew Tedstone

    Two satellite datasets are used to characterize winter landfast first-year sea-ice (FYI), deformed FYI (DFYI) and multiyear sea-ice (MYI) roughness in the Canadian Arctic Archipelago (CAA): (1) optical Multi-angle Imaging SpectroRadiometer (MISR) and (2) synthetic aperture radar Sentinel-1. The Normalized Difference Angular Index (NDAI) roughness proxy derived from MISR, and backscatter from Sentinel-1

    更新日期:2020-07-08
  • Monitoring evolution of melt ponds on first-year and multiyear sea ice in the Canadian Arctic Archipelago with optical satellite data
    Ann. Glaciol. (IF 2.318) Pub Date : 2020-07-08
    Qing Li; Chunxia Zhou; Lei Zheng; Tingting Liu; Xiaotong Yang

    The evolution of melt ponds on Arctic sea ice in summer is one of the main factors that affect sea-ice albedo and hence the polar climate system. Due to the different spectral properties of open water, melt pond and sea ice, the melt pond fraction (MPF) can be retrieved using a fully constrained least-squares algorithm, which shows a high accuracy with root mean square error ~0.06 based on the validation

    更新日期:2020-07-08
  • Observations of exponential wave attenuation in Antarctic sea ice during the PIPERS campaign
    Ann. Glaciol. (IF 2.318) Pub Date : 2020-06-30
    Alison L. Kohout; Madison Smith; Lettie A. Roach; Guy Williams; Fabien Montiel; Michael J. M. Williams

    Quantifying the rate of wave attenuation in sea ice is key to understanding trends in the Antarctic marginal ice zone extent. However, a paucity of observations of waves in sea ice limits progress on this front. We deployed 14 waves-in-ice observation systems (WIIOS) on Antarctic sea ice during the Polynyas, Ice Production, and seasonal Evolution in the Ross Sea expedition (PIPERS) in 2017. The WIIOS

    更新日期:2020-06-30
  • Antarctic subglacial drilling rig: Part I. General concept and drilling shelter structure
    Ann. Glaciol. (IF 2.318) Pub Date : 2020-06-29
    Pavel Talalay; Youhong Sun; Xiaopeng Fan; Nan Zhang; Pinlu Cao; Rusheng Wang; Alexey Markov; Xingchen Li; Yang Yang; Mikhail Sysoev; Yongwen Liu; Yunchen Liu; Wei Wu; Da Gong

    Drilling to the bedrock of ice sheets and glaciers offers unique opportunities for examining the processes occurring in the bed. Basal and subglacial materials contain important paleoclimatic and paleoenvironmental records and provide a unique habitat for life; they offer significant information regarding the sediment deformation beneath glaciers and its effects on the subglacial hydraulic system and

    更新日期:2020-06-29
  • Antarctic subglacial drilling rig: Part III. Drilling auxiliaries and environmental measures
    Ann. Glaciol. (IF 2.318) Pub Date : 2020-06-29
    Xiaopeng Fan; Pavel Talalay; Youhong Sun; Xingchen Li; Nan Zhang; Alexey Markov; Yang Yang; Pinlu Cao; Rusheng Wang; Yongwen Liu; Yunchen Liu; Ting Wang; Wei Wu; Cheng Yang; Jialin Hong; Da Gong; Han Zhang; Mikhail Sysoev; Xiao Li; An Liu; Yazhou Li

    The Antarctic subglacial drilling rig (ASDR) is designed to recover 105 mm-diameter ice cores up to 1400 m depth and 41.5 mm-diameter bedrock cores up to 2 m in length. In order to ensure safe and convenient drilling, drilling auxiliaries are designed to support fieldwork and servicing. These auxiliaries are subdivided into several systems for power supply, drill tripping in the borehole, ice core

    更新日期:2020-06-29
  • Physical and biological properties of early winter Antarctic sea ice in the Ross Sea
    Ann. Glaciol. (IF 2.318) Pub Date : 2020-06-24
    Jean-Louis Tison; Ted Maksym; Alexander D. Fraser; Matthew Corkill; Noriaki Kimura; Yuichi Nosaka; Daiki Nomura; Martin Vancoppenolle; Steve Ackley; Sharon Stammerjohn; Sarah Wauthy; Fanny Van der Linden; Gauthier Carnat; Célia Sapart; Jeroen de Jong; François Fripiat; Bruno Delille

    This work presents the results of physical and biological investigations at 27 biogeochemical stations of early winter sea ice in the Ross Sea during the 2017 PIPERS cruise. Only two similar cruises occurred in the past, in 1995 and 1998. The year 2017 was a specific year, in that ice growth in the Central Ross Sea was considerably delayed, compared to previous years. These conditions resulted in lower

    更新日期:2020-06-24
  • Mapping sea-ice types from Sentinel-1 considering the surface-type dependent effect of incidence angle
    Ann. Glaciol. (IF 2.318) Pub Date : 2020-06-23
    Johannes Lohse; Anthony P. Doulgeris; Wolfgang Dierking

    Automated classification of sea-ice types in Synthetic Aperture Radar (SAR) imagery is complicated by the class-dependent decrease of backscatter intensity with Incidence Angle (IA). In the log-domain, this decrease is approximately linear over the typical range of space-borne SAR instruments. A global correction does not consider that different surface types show different rates of decrease in backscatter

    更新日期:2020-06-23
  • A comparison of automated approaches to extracting englacial-layer geometry from radar data across ice sheets
    Ann. Glaciol. (IF 2.318) Pub Date : 2020-06-17
    Richard Delf; Dustin M. Schroeder; Andrew Curtis; Antonios Giannopoulos; Robert G. Bingham

    Radar surveys across ice sheets typically measure numerous englacial layers that can often be regarded as isochrones. Such layers are valuable for extrapolating age–depth relationships away from ice-core locations, reconstructing palaeoaccumulation variability, and investigating past ice-sheet dynamics. However, the use of englacial layers in Antarctica has been hampered by underdeveloped techniques

    更新日期:2020-06-17
  • Freeboard height and snow depth observed by floating GPS on land-fast sea ice in Nella Fjord, Antarctica
    Ann. Glaciol. (IF 2.318) Pub Date : 2020-06-16
    Qingchuan Zhang; Fei Li; Jintao Lei; Shengkai Zhang; Zhuoming Ding; Wu Chen; Wenhao Li

    Although altimeters have been widely used to monitor the spatiotemporal variation of sea-ice thickness, they are unable to separate sea-ice freeboard from snow depth. We use a floating GPS deployed on sea ice to derive the freeboard and snow depth near China's Zhongshan Station. Our results show that the standalone floating GPS can monitor freeboard with a precision of 4.2 cm. If time-varying dynamic

    更新日期:2020-06-16
  • Antarctic subglacial drill rig. Part II: Ice and Bedrock Electromechanical Drill (IBED)
    Ann. Glaciol. (IF 2.318) Pub Date : 2020-06-11
    Pavel Talalay; Xingchen Li; Nan Zhang; Xiaopeng Fan; Youhong Sun; Pinlu Cao; Rusheng Wang; Yang Yang; Yongwen Liu; Yunchen Liu; Wei Wu; Cheng Yang; Jialin Hong; Da Gong; Han Zhang; Xiao Li; Yunwang Chen; An Liu; Yazhou Li

    A new, modified version of the cable-suspended Ice and Bedrock Electromechanical Drill (IBED) was designed for drilling in firn, ice, debris-rich ice and rock. The upper part of the drill is almost the same for all drill variants and comprises four sections: cable termination, a slip-ring section, an antitorque system and an electronic pressure chamber. The lower part of the IBED comprises an auger

    更新日期:2020-06-11
  • Antarctic subglacial drilling rig: Part IV. Electrical and electronic control system
    Ann. Glaciol. (IF 2.318) Pub Date : 2020-06-11
    Nan Zhang; Pavel Talalay; Jingbiao Liu; Xiaopeng Fan; Qingpeng Kong; Haibin Yu; Yunchen Liu; Benkun Liu; Da Gong; Xingchen Li; Wei Wu; Jialin Hong; Mikhail Sysoev

    In many cases, the efficiency and safety of a drilling project depend on the reliability of the electrical and electronic control system, as the process progresses without visual access of the operator. The electrical and electronic system provides and regulates the power supply for the drill, collects and monitors the drill data during the whole operating process, and sends and receives the control

    更新日期:2020-06-11
  • Sea-ice production and air/ice/ocean/biogeochemistry interactions in the Ross Sea during the PIPERS 2017 autumn field campaign
    Ann. Glaciol. (IF 2.318) Pub Date : 2020-06-11
    S. F. Ackley; S. Stammerjohn; T. Maksym; M. Smith; J. Cassano; P. Guest; J.-L. Tison; B. Delille; B. Loose; P. Sedwick; L. DePace; L. Roach; J. Parno

    The Ross Sea is known for showing the greatest sea-ice increase, as observed globally, particularly from 1979 to 2015. However, corresponding changes in sea-ice thickness and production in the Ross Sea are not known, nor how these changes have impacted water masses, carbon fluxes, biogeochemical processes and availability of micronutrients. The PIPERS project sought to address these questions during

    更新日期:2020-06-11
  • Surface flooding of Antarctic summer sea ice
    Ann. Glaciol. (IF 2.318) Pub Date : 2020-06-11
    S. F. Ackley; D. K. Perovich; T. Maksym; B. Weissling; H. Xie

    The surface flooding of Antarctic sea ice in summer covers 50% or more of the sea-ice area in the major summer ice packs, the western Weddell and the Bellingshausen-Amundsen Seas. Two CRREL ice mass-balance buoys were deployed on the Amundsen Sea pack in late December 2010 from the icebreaker Oden, bridging the summer period (January–February 2011). Temperature records from thermistors embedded vertically

    更新日期:2020-06-11
  • Interferometric discrimination of cross-track bed clutter in ice-penetrating radar sounding data
    Ann. Glaciol. (IF 2.318) Pub Date : 2020-06-10
    Kirk M. Scanlan; Anja Rutishauser; Duncan A. Young; Donald D. Blankenship

    The interpretations of relevant interfaces (i.e. the surface and bed) in radar sounding datasets over glaciers and ice sheets are primary boundary conditions in a variety of climate studies and particularly subglacial water routing models. It is therefore necessary to ensure these interpretations are consistent and not affected by cross-track clutter. For the surface interface, interferometry and a

    更新日期:2020-06-10
  • Ice extent in sub-arctic fjords and coastal areas from 2001 to 2019 analyzed from MODIS imagery
    Ann. Glaciol. (IF 2.318) Pub Date : 2020-06-03
    Megan O'Sadnick; Chris Petrich; Camilla Brekke; Jofrid Skarðhamar

    Results examining variations in the ice extent along the Norwegian coastline based on the analysis of Moderate Resolution Imaging Spectroradiometer (MODIS) images from 2001 to 2019, February through May, are presented. A total of 386 fjords and coastal areas were outlined and grouped into ten regions to assess seasonal and long-term trends in ice extent. In addition, three fjords were examined to investigate

    更新日期:2020-06-03
  • Geospatial simulations of airborne ice-penetrating radar surveying reveal elevation under-measurement bias for ice-sheet bed topography
    Ann. Glaciol. (IF 2.318) Pub Date : 2020-05-28
    Oliver T. Bartlett; Steven J. Palmer; Dustin M. Schroeder; Emma J. MacKie; Timothy T. Barrows; Alastair G. C. Graham

    Airborne radio-echo sounding (RES) surveys are widely used to measure ice-sheet bed topography. Measuring bed topography as accurately and widely as possible is of critical importance to modelling ice dynamics and hence to constraining better future ice response to climate change. Measurement accuracy of RES surveys is influenced both by the geometry of bed topography and the survey design. Here we

    更新日期:2020-05-28
  • The precision of radar-derived subglacial bed topography: a case study from Pine Island Glacier, Antarctica
    Ann. Glaciol. (IF 2.318) Pub Date : 2020-05-28
    Edward C. King

    Recent advances in the measurement of bedforms beneath active ice streams have been made using ground-based grid profiling using impulse radar systems operating with centre frequencies in the 3–5 MHz range. Surveys of Rutford Ice Stream and Pine Island Glacier have shown that features such as mega-scale glacial lineations with topographic relief of as little as 3 m can be traced for many kilometres

    更新日期:2020-05-28
  • A framework for attenuation method selection evaluated with ice-penetrating radar data at South Pole Lake
    Ann. Glaciol. (IF 2.318) Pub Date : 2020-05-27
    Benjamin H. Hills; Knut Christianson; Nicholas Holschuh

    All radar power interpretations require a correction for attenuative losses. Moreover, radar attenuation is a proxy for ice-column properties, such as temperature and chemistry. Prior studies use either paired thermodynamic and conductivity models or the radar data themselves to calculate attenuation, but there is no standard method to do so; and, before now, there has been no robust methodological

    更新日期:2020-05-27
  • Surface accumulation in Northern Central Greenland during the last 300 years
    Ann. Glaciol. (IF 2.318) Pub Date : 2020-05-22
    Nanna B. Karlsson; Sebastian Razik; Maria Hörhold; Anna Winter; Daniel Steinhage; Tobias Binder; Olaf Eisen

    The internal stratigraphy of snow and ice as imaged by ground-penetrating radar may serve as a source of information on past accumulation. This study presents results from two ground-based radar surveys conducted in Greenland in 2007 and 2015, respectively. The first survey was conducted during the traverse from the ice-core station NGRIP (North Greenland Ice Core Project) to the ice-core station NEEM

    更新日期:2020-05-22
  • Automated detection and characterization of Antarctic basal units using radar sounding data: demonstration in Institute Ice Stream, West Antarctica
    Ann. Glaciol. (IF 2.318) Pub Date : 2020-05-21
    Madison L. Goldberg; Dustin M. Schroeder; Davide Castelletti; Elisa Mantelli; Neil Ross; Martin J. Siegert

    Basal units – visibly distinct englacial structures near the ice-bed interface – warrant investigation for a number of reasons. Many are of unknown composition and origin, characteristics that could provide substantial insight into subglacial processes and ice-sheet history. Their significance, moreover, is not limited to near-bed depths; these units appear to dramatically influence the flow of surrounding

    更新日期:2020-05-21
  • Effect of frequent winter warming events (storms) and snow on sea-ice growth – a case from the Atlantic sector of the Arctic Ocean during the N-ICE2015 campaign
    Ann. Glaciol. (IF 2.318) Pub Date : 2020-05-21
    Ioanna Merkouriadi; Bin Cheng; Stephen R. Hudson; Mats A. Granskog

    We examine the relative effect of warming events (storms) and snow cover on thermodynamic growth of Arctic sea ice in winter. We use a 1-D snow and ice thermodynamic model to perform sensitivity experiments. Observations from the winter period of the Norwegian young sea ICE (N-ICE2015) campaign north of Svalbard are used to initiate and force the model. The N-ICE2015 winter was characterized by frequent

    更新日期:2020-05-21
  • The polar sea ice topography reconstruction system
    Ann. Glaciol. (IF 2.318) Pub Date : 2020-05-19
    Scott Sorensen; Vinit Veerendraveer; Wayne Treible; Andrew R. Mahoney; Chandra Kambhamettu

    The Polar Sea Ice Topography REconstruction System, or PSITRES, is a 3D camera system designed to continuously monitor an area of ice and water adjacent to an ice-going vessel. Camera systems aboard ships in the polar regions are common; however, the application of computer vision techniques to extract high-level information from the imagery is infrequent. Many of the existing systems are built for

    更新日期:2020-05-19
  • An efficient melting probe for glacial research
    Ann. Glaciol. (IF 2.318) Pub Date : 2020-05-15
    Dirk Heinen; Peter Linder; Simon Zierke; Christopher Wiebusch

    In this paper, we present an electric-thermal drill with a novel design of a melting head that was developed within the EnEx-RANGE project. The design combines a short melting head with a large surface area of parabolic shape. It was succesfully tested in the laboratory as well as on Alpine glaciers (Langenferner and Mittelbergferner) and at the Ross Ice Shelf in Antarctica. In all these different

    更新日期:2020-05-15
  • Impacts of synoptic-scale cyclones on Arctic sea-ice concentration: a systematic analysis
    Ann. Glaciol. (IF 2.318) Pub Date : 2020-05-13
    Erika A. P. Schreiber; Mark C. Serreze

    The role of synoptic-scale cyclones in the trends and variability of Arctic sea ice conditions has remained uncertain. In recognition, we conduct a systematic investigation of how sea-ice concentration (SIC) changes with cyclone passage, including all individual storms that pass over any part of the region's ice pack. For all seasons, especially summer and autumn, we find a pattern of higher ice concentration

    更新日期:2020-05-13
  • Mechanisms driving the asymmetric seasonal cycle of Antarctic Sea Ice in the CESM Large Ensemble
    Ann. Glaciol. (IF 2.318) Pub Date : 2020-05-11
    Clare Eayrs; Daiane Faller; David M. Holland

    The yearly paired process of slow growth and rapid melt of some 15 million square kilometers of Antarctic sea ice takes place with a regular asymmetry; the process has been linked to the relationship of the position of the ice edge with the band of low pressure that circles the continent between 60° and 70°S. In autumn, winds to the north of the low-pressure band slow the advancing ice edge. In summer

    更新日期:2020-05-11
  • Modeling ice birefringence and oblique radio wave propagation for neutrino detection at the South Pole
    Ann. Glaciol. (IF 2.318) Pub Date : 2020-04-27
    T. M. Jordan; D. Z. Besson; I. Kravchenko; U. Latif; B. Madison; A. Nokikov; A. Shultz

    The Askaryan Radio Array (ARA) experiment at the South Pole is designed to detect high-energy neutrinos which, via in-ice interactions, produce coherent radiation at frequencies up to 1000 MHz. Characterization of ice birefringence, and its effect upon wave polarization, is proposed to enable range estimation to a neutrino interaction and hence aid in neutrino energy reconstruction. Using radio transmitter

    更新日期:2020-04-27
  • Reflections on the anomalous ANITA events: the Antarctic subsurface as a possible explanation
    Ann. Glaciol. (IF 2.318) Pub Date : 2020-04-24
    Ian M. Shoemaker; Alexander Kusenko; Peter Kuipers Munneke; Andrew Romero-Wolf; Dustin M. Schroeder; Martin J. Siegert

    The Antarctic Impulsive Transient Antenna (ANITA) balloon experiment was designed to detect radio signals initiated by high-energy neutrinos and cosmic ray (CR) air showers. These signals are typically discriminated by the polarization and phase inversions of the radio signal. The reflected signal from CRs suffer phase inversion compared to a direct ‘tau neutrino’ event. In this paper, we study subsurface

    更新日期:2020-04-24
  • Surface and subsurface radar equations for radar sounders
    Ann. Glaciol. (IF 2.318) Pub Date : 2020-04-24
    Mark S. Haynes

    This work is a collection of radar equations for low-frequency radar sounding and radar in general that emphasize the form of the radar equation for different target and source geometries. This is meant as a handbook for scientists and engineers that work with or analyze radar sounder systems and interpret radar sounding echoes. Lookup tables summarize the results and derivations are provided for each

    更新日期:2020-04-24
  • Carbon and nitrogen uptake rates and macromolecular compositions of bottom-ice algae and phytoplankton at Cambridge Bay in Dease Strait, Canada
    Ann. Glaciol. (IF 2.318) Pub Date : 2020-04-23
    Kwanwoo Kim; Sun-Yong Ha; Bo Kyung Kim; C. J. Mundy; Kathleen M. Gough; Nicole M. Pogorzelec; Sang Heon Lee

    Our understanding of ice algal responses to the recent changes in Arctic sea ice is impeded by limited field observations. In the present study, environmental characteristics of the landfast sea-ice zone as well as primary production and macromolecular composition of ice algae and phytoplankton were studied in the Kitikmeot Sea near Cambridge Bay in spring 2017. Averaged total chlorophyll-a (Chl-a)

    更新日期:2020-04-23
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