New data on the structure and motion of the ice sheet in the area of a runway of the Novolazarevskaya Reserch Station (East Antarctica)

Мұқаба

Дәйексөз келтіру

Толық мәтін

Ашық рұқсат Ашық рұқсат
Рұқсат жабық Рұқсат берілді
Рұқсат жабық Тек жазылушылар үшін

Аннотация

Currently, the Russian Federation has the only “blue ice” runway in Antarctica. It is located on the Queen Maud Land and is a part part of the landing site of the Russian Novolazarevskaya Station. This is one of the largest aviation transport hubs in the Indo-Atlantic sector of the continent, capable of landing heavy aircraft with wheeled chassis. Despite all the advantages that “blue ice” runways have, due to their location on the glacier, they are subject to dangerous glaciological processes caused by the ice sheet motions. The purpose of this research is to study the structure of the ice sheet along the runway and in the vicinity of the airbase Novo Runway (Novolazarevskaya Station), as well as to continue monitoring the uneven flow of the glacier, which began in 2021. The article presents the results of field studies carried out from December 2023 to February 2024, which included georadar profiling at a frequency of 150 MHz and three definitions of the coordinates of the runway markings to estimate their displacement for the summer season of 2023/24.There are also presented: a comparison of the values of the ice sheet deformation within the runway limits measured in the autumn of 2021 and the Antarctic summer of 2023/24, the calculation of deformations for the two-year period of monitoring, and the analysis of air temperature data for 2014–2024 from the weather station of the Novo Runway. It was found that at the beginning of the runway (up to 800 m) small healed crevasses are observed. This area requires regular visual monitoring. The central part of the runway appears to be the most complex in structure, demonstrating relatively high deformations in the marginal parts and characterized by large vertical structures in the glacier. In the long term, this area, as well as about 400 m at the end of the runway, are the most unstable. A joint analysis of data on the displacement of runway markings for 2021 and 2023/24 showed that values of the deformations may differ by an order of magnitude from year to year. Based on the results obtained, three areas were identified within limits of the runway, which differ in the degree of need for regular examination of their condition.

Толық мәтін

Рұқсат жабық

Авторлар туралы

A. Boronina

State Hydrological Institute

Хат алмасуға жауапты Автор.
Email: al.b.s@yandex.ru
Ресей, St. Petersburg

M. Kashkevich

Saint-Petersburg State University

Email: al.b.s@yandex.ru
Ресей, St. Petersburg

S. Popov

Polar Marine Geosurvey Expedition; Saint-Petersburg State University

Email: al.b.s@yandex.ru
Ресей, St. Petersburg; St. Petersburg

E. Mikhailov

Saint-Petersburg State University

Email: al.b.s@yandex.ru
Ресей, St. Petersburg

A. Druzhin

Saint-Petersburg State University

Email: al.b.s@yandex.ru
Ресей, St. Petersburg

Әдебиет тізімі

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Қосымша файлдар

Қосымша файлдар
Әрекет
1. JATS XML
Жүктеу
2. Fig. 1. Location map of the study in the Novo Runway area: 1 – GPR routes; 2 – GNSS survey points 2023/24; 3 – runway marking flags used to calculate ice sheet deformation over a 2-year period; 4 – automatic weather stations Milos 520

Жүктеу (53KB)
Метадеректер
3. Fig. 2. Field work at the Novo Runway area: GPR sounding with OKO-3 at a frequency of 150 MHz (а); EFT M2 base station (б); measurement by EFT M2 rover (в); automatic weather station Milos 520 (г)

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Метадеректер
4. Fig. 3. GPR profiles obtained in the Novo Runway area (The profile names correspond to Fig. 1)

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Метадеректер
5. Fig. 4. Zone of crevasses on the limbs and in the core of anticline: mostly healed with ice crevasses on the runway (а); large near-surface crevasses located 1.4 km south of the runway (б); chart of the location of fragments of GPR profiles in sections а and в (в). In sections а and б, the red dashed line shows the lower boundary of the superimposed ice

Жүктеу (188KB)
Метадеректер
6. Fig. 5. Deformation rates scheme of the glacier in the area of runway during the monitoring period (October 31, 2021 – February 4, 2024). Values of deformation rates of the glacier (year–1) along (prefix B:) and across (prefix P:) the Novo Runway. Positive values (stretching) are red lines, negative values (compression) are blue lines. The length of the line is proportional to the value of the modulus of deformation rates (а). Deformation rates scheme combined with the GPR section along the «RW» profile (its position is shown in Fig. 1) (б). In section (а): 1 – position of marking flags on 10/31/2021; 2 – position of marking flags 02/04/2024; 3 – deformation rates across the runway axis; 4 – deformation rates along the runway axis; 5 – names of polygons; 6 – runway

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7. Fig. 6. Classification of the runway by structures (zones) in the ice sheet and the degree of need for their monitoring (colors): GPR section “RW” obtained along the central axis of the Novo Runway (а); a fragment of the GPR profile demonstrating the undisturbed occurrence of ice layers (zone 1) (б); abundant diffracted waves from small healed crevasses at the beginning of the runway on the limb of the anticlinal fold (zone 2) (в); fragment of a GPR profile demonstrating subvertical contact in the area of ice flow junction (zone 3) (г). Green – safe areas; yellow – areas of medium danger that requires monitoring of crevasses; red – the most unsafe areas in the long term. Green – stable areas; yellow – areas requiring visual monitoring of crevasses; red – relatively unstable areas in the long term, requiring regular monitoring

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Метадеректер

© Russian Academy of Sciences, 2024

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