Polar Science最新文献_第9页

The marine methane cycle in the Canadian Arctic Archipelago during summer 夏季加拿大北极群岛的海洋甲烷循环

IF 1.5 4区地球科学 Q3 ECOLOGY

Polar Science

Pub Date : 2024-12-01 DOI: 10.1016/j.polar.2024.101128

Alessandra D'Angelo , Cynthia Garcia , Zak Kerrigan , Jacob Strock , Frances Crable , Nikolas VanKeersbilck , Humair Raziuddin , Theressa Ewa , Samira Umar , Andrew L. King , Miquel Gonzalez-Meler , Brice Loose

In the Arctic Ocean, methane concentrations surpassing global averages are prevalent, especially along sub-Arctic and Arctic continental shelf margins. Despite elevated dissolved methane levels, the Arctic Ocean exhibits minimal methane fluxes to the atmosphere, indicating a potential role of water column oxidation in methane processing. During the Northwest Passage Project in the summer of 2019, we integrated thermohaline, chemical, and biological data with in-situ and in-vitro methane data in Canadian Arctic Archipelago (CAA) waters. Elevated in-situ dissolved methane was prominent in near-surface Pacific waters (between 2 and 7 m), particularly in meltwater regions, with av. concentrations of 5.8 ± 2.5 nM within the upper 30m. While methane oxidation constants were generally low (av. 0.006 ± 0.002 d⁻¹), surface waters in Wellington Channel and Croker Bay exhibited higher rates (av. 0.01 ± 0.0004 d⁻¹), associated with Pacific-origin microbial taxa like Oleispira and Aurantivirga. Deeper layers (>200 m) displayed lower methane concentrations (av. 3.1 ± 1.1 nM) and oxidation rates (av. 0.005 ± 0.001 d⁻¹). Sea ice showed elevated dissolved methane concentrations (av. 9.2 ± 5 nM). Waters in the western CAA exhibited a 25% increase in methane concentrations compared to ice-free areas. The overall picture suggested supersaturation of in-situ methane in shallow waters (between 2 and 50 m), coupled with faster oxidation rates in meltwater and Pacific dominant layers, suggesting rapid seasonal cycling of methane and prevention of the methane migration into the atmosphere.

在北冰洋，甲烷浓度普遍超过全球平均水平，特别是沿亚北极和北极大陆架边缘。尽管溶解的甲烷含量升高，北冰洋向大气的甲烷通量却很少，这表明水柱氧化在甲烷加工过程中可能起作用。在2019年夏季的西北航道项目中，我们将加拿大北极群岛（CAA）水域的热盐、化学和生物数据与原位和体外甲烷数据相结合。在太平洋近地表水域（2 - 7米），特别是在融水区，原位溶解甲烷浓度显著升高，在30米以上的水域，ava浓度为5.8±2.5 nM。惠灵顿海峡和克罗克湾的甲烷氧化常数普遍较低（av. 0.006±0.002 d - 1），而威灵顿海峡和克罗克湾的甲烷氧化常数较高（av. 0.01±0.0004 d - 1），与太平洋起源的微生物类群如Oleispira和Aurantivirga有关。深层（>200 m）显示较低的甲烷浓度（av. 3.1±1.1 nM）和氧化速率（av. 0.005±0.001 d - 1）。海冰溶解甲烷浓度升高（平均9.2±5 nM）。与无冰区相比，CAA西部水域的甲烷浓度增加了25%。整体情况表明，浅水（2 - 50米）的原位甲烷过饱和，加上融水和太平洋优势层中更快的氧化速率，表明甲烷的快速季节性循环和阻止甲烷迁移到大气中。

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引用次数: 0

Factors influencing harvest success for an Arctic under-ice subsistence fishery 影响北极冰下自给渔业成功收获的因素

IF 1.5 4区地球科学 Q3 ECOLOGY

Polar Science

Pub Date : 2024-12-01 DOI: 10.1016/j.polar.2024.101126

John C. Seigle , Alexander K. Prichard , Adrian E. Gall , Thomas Nukapigak

Long-term fisheries datasets are particularly rare in Arctic environments and are essential to understanding the variability in harvest rates. We analyzed 30 years of harvest monitoring data and compared results to fish monitoring data from nearshore waters of Prudhoe Bay, Alaska, to determine the importance of age-0 recruitment and intra-annual factors on subsequent harvests of Arctic cisco in the Colville River delta (CRD), Alaska. While age-0 recruitment to Prudhoe Bay was positively associated with annual harvest success in the CRD, wind and salinity patterns and subsistence fishing location and timing also contributed significantly in explaining adult harvest variability. Harvest rates were highest closest to the river mouth and early in the season. Harvest rates increased with increasing salinity up to 25 ppt, then declined. As the climate changes in the region, we may see shifts in nearshore ocean and river conditions which will impact recruitment and fishing activity. These long-term monitoring efforts will continue to inform sustainable fisheries management in the face of a rapidly changing climate, and with ongoing infrastructure development in the region.

长期渔业数据集在北极环境中特别罕见，对了解收获率的变化至关重要。我们分析了30年的捕捞监测数据，并将结果与阿拉斯加普拉德霍湾近岸水域的鱼类监测数据进行了比较，以确定在阿拉斯加科尔维尔河三角洲（CRD）， 0岁招募和年内因素对北极思科后续捕捞的重要性。虽然0岁到普拉德霍湾的招募与CRD的年度收获成功呈正相关，但风和盐度模式以及自给捕鱼的地点和时间也在解释成年收获变化方面发挥了重要作用。收获率在靠近河口和季节早期最高。收获率随着盐度的增加而增加，最高可达25ppt，然后下降。随着该地区气候的变化，我们可能会看到近岸海洋和河流条件的变化，这将影响招聘和捕捞活动。这些长期监测工作将继续为面对快速变化的气候和该区域正在进行的基础设施发展的可持续渔业管理提供信息。

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引用次数: 0

Status on snow cover area, mass balance, glacial area loss, surface velocities and applications of snowmelt runoff model over Kashmir Himalayas and Upper Indus Basin: A review 克什米尔喜马拉雅山脉和上印度河流域的积雪覆盖面积、质量平衡、冰川面积损失、地表速度和融雪径流模型应用现状：综述

IF 1.5 4区地球科学 Q3 ECOLOGY

Polar Science

Pub Date : 2024-12-01 DOI: 10.1016/j.polar.2024.101075

Suhail Ahmad Dar , Md. Omar Sarif

This review work presented a detailed review of snow cover area, mass balance status, glacial area loss, surface velocities and applications of snowmelt runoff model (SRM) applied in the Kashmir Himalayas and Upper Indus Basin (UIB) of the Himalayas. This study reviewed all the studies done in the past which are done on the Kashmir Himalayas and UIB glaciers by different methods. The geodetic and glaciological methods suggested that the glaciers in the Kashmir Himalayas and UIB are having a negative glacial mass balance and are losing ice mass at higher rates during the last two decades and are losing glacial area every year. And the glaciers in the Zanskar range are also having negative mass balance but are losing less ice mass as compared to the Glaciers in Kashmir Himalayas, while the glaciers in the Karakorum range are having positive mass balance and are losing glacial area at slower rates. Studies have found that higher surface velocities are observed in the glaciers which are present in the Kashmir region and indicate rapid melting because of higher temperatures recorded in this part of the world because of global warming. This review reflects an increasing understanding that how much of the water reservoirs we have lost and in which era we are heading to.

本综述对喜马拉雅山脉克什米尔喜马拉雅山和上印度河流域（UIB）的积雪覆盖面积、质量平衡状况、冰川面积损失、地表速度以及融雪径流模型（SRM）的应用进行了详细综述。本研究回顾了过去通过不同方法对克什米尔喜马拉雅山和上印度河流域冰川进行的所有研究。大地测量和冰川学方法表明，克什米尔喜马拉雅山和 UIB 的冰川正处于负冰川质量平衡状态，在过去二十年里，冰川质量正在以更高的速度流失，冰川面积也在逐年减少。赞斯卡尔山脉的冰川也处于负冰川质量平衡状态，但与克什米尔喜马拉雅山脉的冰川相比，冰量损失较少，而喀喇昆仑山脉的冰川则处于正冰川质量平衡状态，冰川面积损失速度较慢。研究发现，克什米尔地区的冰川表面速度较快，这表明由于全球变暖，该地区的气温升高，冰川正在迅速融化。这篇评论反映了人们越来越了解我们失去了多少水库，以及我们正在走向哪个时代。

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引用次数: 0

Assessment and validation of Land Surface Temperature retrieval algorithms using Landsat 8 TIRS data in Antarctic ice-free areas 基于Landsat 8 TIRS数据的南极无冰区地表温度反演算法评估与验证

IF 1.5 4区地球科学 Q3 ECOLOGY

Polar Science

Pub Date : 2024-12-01 DOI: 10.1016/j.polar.2024.101127

David Kirner, Kamil Láska, Zdeněk Stachoň

This study evaluates the effectiveness of different Land Surface Temperature (LST) retrieval algorithms applied to Landsat 8 Thermal Infrared Sensor (TIRS) data in the ice-free regions of the Antarctic Peninsula. The primary objective is to determine the most accurate algorithm for LST estimation in these environments. Three algorithms, namely radiative transfer equation (RTE), single channel (SC), and mono window (MW), were utilised and compared to in-situ measurements at two locations in the northern part of James Ross Island (JRI), Antarctic Peninsula. The study considered various factors influencing LST accuracy, including land surface emissivity, atmospheric conditions, and sun elevation angles. The findings reveal that all three algorithms demonstrate significant sensitivity to emissivity. The MW algorithm emerged as the most suitable, showing the lowest root mean square error (RMSE) of 3.06 °C, followed by the SC and RTE algorithms with RMSE values of 3.68 and 3.98 °C, respectively. The study also underscores a strong positive correlation between LST retrieval accuracy and sun elevation angle, with more accurate results obtained from satellite images acquired in February, characterised by lower sun elevation angles. No significant relationship with water vapour content in the atmosphere was identified during the investigated period.

本研究评估了不同地表温度（LST）检索算法在南极半岛无冰区Landsat 8热红外传感器（TIRS）数据中的有效性。主要目标是确定在这些环境中最准确的LST估计算法。利用辐射传输方程（RTE）、单通道（SC）和单窗口（MW）三种算法，对南极半岛詹姆斯罗斯岛（JRI）北部两个地点的原位测量结果进行了比较。该研究考虑了影响地表温度精度的各种因素，包括地表发射率、大气条件和太阳仰角。研究结果表明，这三种算法对发射率都具有显著的敏感性。MW算法的均方根误差（RMSE）最低，为3.06°C，其次是SC算法，RMSE分别为3.68°C和3.98°C。该研究还强调地表温度反演精度与太阳仰角之间存在很强的正相关关系，2月份获取的卫星图像获得的结果更准确，其特征是太阳仰角较低。在调查期间，未发现与大气中水蒸气含量有显著关系。

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引用次数: 0

Evaluating and locating a suitable bedrock drilling site near zhongshan station with airborne and ground-based observations 通过航空和地面观测评估和确定中山站附近合适的基岩钻探地点

IF 1.5 4区地球科学 Q3 ECOLOGY

Polar Science

Pub Date : 2024-12-01 DOI: 10.1016/j.polar.2024.101076

Yanjun Li , Xiangbin Cui , Gang Qiao , Lin Li , Shinan Lang

Understanding the interaction between the Antarctic biogeochemical cycle and global environmental change requires a comprehensive investigation of the ice sheet and underlying bedrock. An effective approach to investigating subglacial characteristics is through bedrock drilling, making the identification of a suitable drilling site a crucial prerequisite. In this study, data from airborne ice-penetrating radar and an Uncrewed Aerial Vehicle (UAV) remote sensing were used in combination to obtain real-time and high-resolution information about the surface, ice thickness, and subglacial conditions in a local area near Zhongshan Station, and further to identify a drilling site that is both safe and optimal for the successful acquisition of bedrock samples beneath the East Antarctic Ice Sheet. By analyzing the airborne ice-penetrating radar data from the 35th Chinese National Antarctic Research Expedition (CHINARE) (2018–2019), a potential drilling site was selected based on ice thickness (≤200 m) and a dry basal condition with no channels or basal crevasses, to avoid drilling fluid leakage. UAV data confirmed stable surface topography, ice flow, and the absence of surface crevasses. The optimal site was identified as located close to the western flank of the upstream part of the Dålk Glacier. In 2019, CHINARE successfully retrieved a valuable bedrock core sample from the borehole at this location. This study provides a feasible and effective methodology for locating a bedrock drilling site by using data from airborne ice-penetrating radar and UAV remote sensing.

要了解南极生物地球化学循环与全球环境变化之间的相互作用，需要对冰盖和下伏基岩进行全面调查。调查冰川下特征的有效方法是进行基岩钻探，因此确定合适的钻探地点是关键的先决条件。本研究结合使用机载透冰雷达和无人机遥感数据，获得了中山站附近局部地区地表、冰层厚度和冰川下条件的实时高分辨率信息，并进一步确定了一个既安全又能成功获取南极东部冰盖下基岩样本的最佳钻探地点。通过分析第35次中国国家南极科学考察（CHINARE）（2018-2019年）的机载冰穿雷达数据，根据冰层厚度（≤200米）和无通道或基底裂缝的干燥基底条件，选择了一个潜在的钻探地点，以避免钻井液泄漏。无人机数据确认了稳定的地表地形、冰流和无地表裂缝。最佳地点被确定为靠近达尔克冰川上游西侧。2019 年，CHINARE 从该地点的钻孔中成功取回了珍贵的基岩岩芯样本。这项研究为利用机载透冰雷达和无人机遥感数据确定基岩钻探地点提供了可行而有效的方法。

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引用次数: 0

Collaboration network analysis for the Arctic issues based on a collection of international collaborative events 基于国际合作活动集的北极问题合作网络分析

IF 1.5 4区地球科学 Q3 ECOLOGY

Polar Science

Pub Date : 2024-12-01 DOI: 10.1016/j.polar.2024.101091

Xiaoxue Ma , Qiaoling Du , Weiliang Qiao , Yang Liu

In recent years, global warming has accelerated the melting of Arctic ice. The value of the Arctic has been increasing in various aspects and has received widespread attention from the international community. The significance of globalization of the Arctic issue has become more and more prominent, the member states of the Arctic Council, observer states, and non-Arctic countries that have intensively developed and updated their respective Arctic strategies have actively participated about Arctic issues. The international collaboration has gradually become an effective way of addressing Arctic issues. In order to explore the pattern behind the collaborative events about Arctic issues, with the application of complex network analysis, the international collaborative events about Arctic issues from 2013 to 2023 are selected to construct the collaborative networks. Then the collaborative networks are quantitatively analyzed by the relevant parameters of complex network. These parameters for quantitative analysis include network density, average path length, clustering coefficient, degree centrality, closeness centrality and betweenness centrality. The results of the study reveal the changes in international collaboration about Arctic issues from 2013 to 2023.

近年来，全球变暖加速了北极冰层的融化。北极各方面的价值不断提升，受到国际社会的广泛关注。北极问题的全球化意义日益凸显，北极理事会成员国、观察员国、非北极国家等纷纷制定和更新各自的北极战略，积极参与北极问题。国际合作逐渐成为解决北极问题的有效途径。为了探究北极问题合作事件背后的规律，本文运用复杂网络分析法，选取了2013年至2023年的北极问题国际合作事件，构建了合作网络。然后利用复杂网络的相关参数对合作网络进行定量分析。这些定量分析参数包括网络密度、平均路径长度、聚类系数、度中心性、亲近中心性和间度中心性。研究结果揭示了从 2013 年到 2023 年北极问题国际合作的变化。

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引用次数: 0

Thaw slump development and other rapid permafrost disturbances in Hollendardalen Valley, Svalbard 斯瓦尔巴群岛霍伦达达伦山谷的融化滑坡发展和其他快速的永久冻土扰动

IF 1.5 4区地球科学 Q3 ECOLOGY

Polar Science

Pub Date : 2024-12-01 DOI: 10.1016/j.polar.2024.101122

Vasiliy Demidov , Sergey Verkulich , Aleksey Ekaykin , Anton Terekhov , Arina Veres , Anna Kozachek , Sebastian Wetterich , Diana Soloveva , Mikhail Varentsov , Kirill Barskov

From 2019 to 2022, for the first time in Svalbard, the rapid development of a thaw slump was observed in Hollendardalen Valley (Nordenskiöld Land, West Spitsbergen), affecting an area of 6300 m². Fast-paced thermokarst and thermo-erosion processes exposed massive ground ice, as well as thick ground ice veins within frozen silt strata. In the riverbed – in a non-carbonate, non-karstifying geological setting – thaw funnels appeared, swallowing part of the river flow, presumably via a local fault zone connecting to deep aquifers. The exposed ground ice has extremely low mineralization, dominated by Na⁺ and SO₄²⁻ ions. The properties and morphology of the ice veins point to segregation origins. The broad middle reaches of the Hollendardalen Valley exhibit thermokarst depressions and lakes, tabular terrace remnants and traces of past thaw slumping. Such morphology represents a thermo-erosional plain, formed through the interplay of fluvial erosion and a series of fast-paced thermo-erosion and thermokarst events. The very presence of massive ground ice in places where its appearance was previously unexpected indicates the possibility of detecting further ground ice of various thicknesses in Svalbard. Thus, ongoing and future permafrost warming will likely accelerate rapid permafrost thaw in Svalbard, reshaping the surface morphology and subsurface hydrology.

从2019年到2022年，斯瓦尔巴群岛首次在Hollendardalen山谷（Nordenskiöld Land，西斯匹次卑尔根岛）观察到融化滑坡的快速发展，影响了6300平方米的面积。快节奏的热岩溶和热侵蚀过程暴露了大量的地下冰，以及冻结粉土地层中厚的地下冰脉。在河床上，在非碳酸盐、非岩溶地质环境中，出现了融化漏斗，可能是通过连接深层含水层的局部断裂带，吞噬了部分河水。地表冰矿化程度极低，以Na+和SO42−离子为主。冰脉的性质和形态表明了分离的起源。广阔的霍伦达达伦河谷中游地区有热岩溶洼地和湖泊、板状阶地遗迹和过去融化滑坡的痕迹。这种形态代表了一个热侵蚀平原，是由河流侵蚀和一系列快节奏的热侵蚀和热岩溶事件相互作用而形成的。在以前意想不到的地方出现了大量的地面冰，这表明在斯瓦尔巴群岛有可能探测到更多不同厚度的地面冰。因此，持续和未来的永久冻土变暖可能会加速斯瓦尔巴群岛永久冻土的快速融化，重塑地表形态和地下水文。

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引用次数: 0

Application of menthol anesthetics for body size measurements of the sea angel Clione elegantissima (Mollusca: Gymnosomata) 薄荷醇类麻醉剂在测量海象（软体动物：裸鱼）体型中的应用

IF 1.5 4区地球科学 Q3 ECOLOGY

Polar Science

Pub Date : 2024-12-01 DOI: 10.1016/j.polar.2024.101125

Tomoyasu Yamazaki , Takashi Kuwahara , Kunio T. Takahashi

Understanding body size variation has been a central goal in ecology for almost half a century. However, it is difficult to measure the size of soft-bodied invertebrates accurately, such as members of the genus Clione, which expand and contract their bodies. To allow for accurate body length measurements, anesthetic menthol was used to temporarily relax the bodies of Clione elegantissima collected from the southern Okhotsk Sea. A standard solution was prepared using 1.4 g l-menthol dissolved in 250 mL ethanol. Three test solutions were then prepared using 0.1, 0.25, or 0.5 mL of the standard solution and dissolved in 20 mL of filtered seawater. Using a menthol-based anesthetic, the animals extended their body parts (including foot lobes, wings, and head tentacles), remained motionless, and showed no reaction to pricking with forceps. All tested animals returned to their actual sizes within 1–15 min after placing them back in filtered seawater, indicating that the menthol-based solutions were effective and harmless. The best concentration for measuring the body size C. elegantissima was 0.1 mL of the standard solution. It allowed not only bodies but head tentacles to stretch, providing to the full-length of Clione samples for body size measurements. We suggest that this anesthetic can be used as a new standard for body measurements and morphological observations in Clione species.

近半个世纪以来，了解体型的变化一直是生态学的中心目标。然而，很难准确地测量软体无脊椎动物的大小，比如Clione属的成员，它们的身体可以扩张和收缩。为了精确测量体长，研究人员使用麻醉薄荷醇暂时放松了从鄂霍次克海南部采集的秀丽Clione elegantissima的身体。将1.4 g薄荷醇溶于250 mL乙醇制备标准溶液。然后用0.1、0.25或0.5 mL的标准溶液配制三种测试溶液，溶解在20ml过滤过的海水中。在使用薄荷类麻醉剂后，这些动物伸展了它们的身体部位（包括脚叶、翅膀和头触手），保持不动，对镊子刺痛没有反应。所有被试动物放回过滤过的海水中后，在1-15分钟内恢复到实际大小，表明薄荷醇溶液有效无害。标准溶液的浓度为0.1 mL，可用于测定草体大小。它不仅可以伸展身体，还可以伸展头部的触手，为测量体型提供了完整的Clione样本。我们认为这种麻醉剂可以作为克隆属动物身体测量和形态学观察的新标准。

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引用次数: 0

A statistical study of precipitation on the eastern antarctic plateau (Dome-C) using remote sensing and in-situ instrumentation 利用遥感和现场仪器对南极高原东部（Dome-C）降水量进行统计研究

IF 1.5 4区地球科学 Q3 ECOLOGY

Polar Science

Pub Date : 2024-12-01 DOI: 10.1016/j.polar.2024.101106

Massimo Del Guasta , Philippe Ricaud , Claudio Scarchilli , Giuliano Dreossi

Studying precipitation at very high latitudes is a challenge, particularly during the polar winter. Direct monitoring of ice habit and size in high latitude precipitation is crucial for validating the algorithms used to derive precipitation from radar, and for improving the climatological modeling of polar areas. The high plateau lacks long-term direct observations of precipitation. In this work, carried out at Concordia Station (Dome-C (DC), −75°S, 123°E, 3233 m a.m.s.l), the use of a depolarization LIDAR, a flatbed scanner (ICECAMERA), a microwave profiler (HAMSTRAD) and meteorological instrumentation made possible the study, over the period 2014–2021, of shape, size, height and temperature of formation of precipitation. The precipitation sources were classified into four types: ice fogs, liquid fogs, mixed-phase clouds, and cirrus. Ten representative ice habits for Dome-C were chosen. The size distribution for every habit was calculated, allowing for the estimation of the corresponding radar reflectivity. The use of W-band radars, such as CLOUDSAT, with a sensitivity of −28dB, resulted in capturing all the crystals observed in Concordia. A positive trend was observed between grain size and height in ice habits that are typical of cloud precipitation. North West (NW) and North East (NE) winds at cloud height, blowing from coastal regions, caused the majority of precipitation from clouds. The study also examined the height trend of the ice habit composition of precipitation. The ice habit composition for each of the four types of precipitation source was analyzed, and the possibility of determining the source by simply observing the precipitation was explored. This work marks the first comprehensive investigation of precipitation on the eastern Antarctic plateau.

研究极高纬度地区的降水是一项挑战，尤其是在极地冬季。直接监测高纬度降水中冰的习性和大小，对于验证雷达降水推导算法和改进极地地区气候学建模至关重要。高原缺乏对降水的长期直接观测。这项工作在协和站（Dome-C，南纬-75°，东经 123°，海拔 3233 米）进行，利用去极化激光雷达、平板扫描仪（ICECAMERA）、微波剖面仪（HAMSTRAD）和气象仪器，对 2014-2021 年期间降水的形状、大小、高度和形成温度进行了研究。降水源分为四种类型：冰雾、液雾、混合相云和卷云。为 Dome-C 选取了十种有代表性的冰层习性。计算了每种习性的大小分布，以便估算相应的雷达反射率。使用 W 波段雷达，例如灵敏度为 -28 分贝的 CLOUDSAT，可以捕捉到在协和星观测到的所有晶体。在云降水的典型冰习性中，粒度和高度之间呈正相关趋势。云层高度的西北风和东北风从沿海地区吹来，造成了大部分云降水。该研究还考察了降水冰习性组成的高度趋势。研究分析了四种降水来源的冰习性成分，并探讨了通过观测降水来确定降水来源的可能性。这项研究首次对南极高原东部的降水进行了全面调查。

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引用次数: 0

Comprehending the surface melt characteristics, calving processes, and seasonal ice velocity of Dålk glacier in Larsemann Hills, East Antarctica 从 2016 年到 2023 年了解南极洲东部拉尔斯曼丘陵 Dålk 冰川的表面融化特征和冰移动情况

IF 1.5 4区地球科学 Q3 ECOLOGY

Polar Science

Pub Date : 2024-12-01 DOI: 10.1016/j.polar.2024.101081

Pooja Mishra , Naveen Tripathi , S.K. Singh , S.R. Oza , P.M. Solanki , N.Y. Bhatt

Surface melting induces hydro-fracturing and deformational changes on the ice surface, which have a substantial impact on its dynamics and stability and therefore, comprehending these processes is crucial for ice sheet mass balance and stability. The present study is an attempt to understand the surface melt characteristics, seasonal ice movement, and calving processes of the Dålk glacier located in the Larsemann Hills of East Antarctica using multi-sensor remote sensing observations from 2017 to 2023. We identified and examined several melt features across the glacier and analysed their evolution during the study period. Frontal changes, calving events, and seasonal surface ice velocities of the glacier were also investigated during the study period. We found that the evolution and drainage of the melt features over the Dålk glacier is highly dynamic in nature with a significant inter-annual variability. We report substantial morphological changes in the ice doline structure that may be driven by the surface melt patterns, ice movement, and ice deformation in the region which also, affect the drainage of the nearby connected melt ponds and features. Several minor to very major calving events observed during the period due to immense disintegration processes during the preceding melting season that also affected the ice movement. We also highlight the need of monitoring and studying such melt features over the outlet glaciers that concerns the imminent catastrophic fragmentation and deformational changes over the glacier.

地表融化引起冰面的水力压裂和变形变化，对冰盖的动力学和稳定性产生重大影响，因此，了解这些过程对冰盖的质量平衡和稳定性至关重要。本研究利用2017 - 2023年多传感器遥感观测资料，对东南极洲拉尔森丘陵（Larsemann Hills） d冰川（d冰川）的地表融化特征、季节性冰运动和产冰过程进行了研究。我们确定并检查了冰川上的几个融化特征，并分析了它们在研究期间的演变。在研究期间，还研究了冰川的锋面变化、产犊事件和季节性表面冰速度。研究发现，德马尔克冰川融化特征的演变和排水具有高度的动态性，具有显著的年际变化。我们报告了冰线结构的实质性形态变化，这些变化可能是由该地区的表面融化模式、冰运动和冰变形驱动的，这些变化也影响了附近相连的融化池的排水和特征。在之前的融化季节，由于巨大的崩解过程也影响了冰的运动，在此期间观察到几次小到非常大的产犊事件。我们还强调需要监测和研究出口冰川的这种融化特征，这关系到冰川即将发生的灾难性破碎和变形变化。

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引用次数: 0