Wyniki wyszukiwania - Biblioteka Nauki

1

Domieszki mineralne w lodzie Lodowca Hansa (Spitsbergen)

100%

Gurgul H. , Staroń W. , Mielnik J.

Zeszyty Naukowe. Acta Physica / Uniwersytet Szczeciński

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1998

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tom Nr 9

51--60

EN

This publication contains the results of research conducted in 1997 on Hans Glacier in chosen points. The research included mineral particles of diameter bigger than 1um. The average sections of the particles and their average volumes were calculated Particle size distribution were also made. Based on the research it was found that there were considerable difference in particle size distribution of particles ind different points of the glacier.

2

A meteorological study of the ablation process on Hans Glacier, SW Spitsbergen

83%

Migała K. , Piwowar B. A. , Puczko D. , Migała K. , Piwowar B. A. , Puczko D.

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3

...Tam skaner pośle

71%

Adamek A.

Geodeta : magazyn geoinformacyjny

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2010

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tom nr 2

24-27

4

Wstępne określenie koncentracji i rozkładów dyspersyjnych zawiesin występujących w wodzie pod Lodowcem Hansa (Spitsbergen)

59%

Gurgul H. , Gąsowski R. , Staroń W. , Stochmal W. , Mielnik J.

Zeszyty Naukowe. Acta Physica / Uniwersytet Szczeciński

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1998

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tom Nr 8

45-56

EN

The work concerns investigation of concentration and particle size distribution mineral suspension in samples of water taken at the Hans Glacier in July of 1996. Particles of suspension were classifield according to their diameter using microscope and then particles size distribution was determined.

5

A meteorological study of the ablation process on Hans Glacier, SW Spitsbergen

59%

Migala K. , Piwowar B. A. , Puczko D.

Polish Polar Research

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2006

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tom 27

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nr 3

243-258

EN

The ablation of glaciers is an important factor in energy exchange between the atmosphere and land ice masses. The dynamics of ablation closely reflects climate changes and is important for the estimation of the outflow of meltwater, which, having penetrated a glacier to bedrock, stimulates its velocity by increasing basal sliding. More detailed studies using automatic weather stations (AWS) and the calculation of the energy budget are rarely conducted on small glaciers. The mass balance of the Hans Glacier has been monitored since 1989. Its intensified monitoring using AWS began in 2003. The results show that ablation depends more evidently on the daily mean and maximum air temperature and wind speed than on total and net radiation. Ablation, both that controlled by sonic height ranger and that measured manually on stakes, was compared with the values calculated on the basis of energy flux formulas applied by Oerlemans (2000). The statistical results allowed us to construct empirical equations, which in turn enabled us to compute the course and total ablation during the summer seasons. It can be described on the basis of two primary meteorological elements (air temperature and wind speed), as recorded in the station representing the regional area (Hornsund) or measured in situ on the glacier. Standard measurements of ablation from the years 1989-2004 were used to verify empirical model. The computed mean value of summer ablation for 1989-2004 was calculated at 1.35 m, differing from real measurements by only 10% (with SD = 0.18). The results obtained illustrate that an empirical equation can be applied in time series analyses. A regional ablation model enables us to investigate the mass-balance history of glaciers on the basis of meteorological data.

6

Analysis of short-terms height changes of the Hans Glacier using quasi-continuous GPS observations

48%

Walo J. , Adamek A. , Puczko D.

Reports on Geodesy

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2007

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tom z. 1/82

367-373

EN

The analysis of the measurement results exemplifies very valuable information about the glacier behavior which glaciologists need to understand phenomena occurring on the glacier in different seasons. Beside the experiences collected during this experiment it will be the background to design similar investigations from survey technology and methodology point of view. Basing on these results and experiment analysis we can draw some conclusions: - In the period of the experiment the glacier surface felt down as much as 2 meters. This is the natural tendency and consequences of flowing down the glacier to the fiord and his ablation. - In the figures we could notice wavy nature of the phenomenon of the glacier surface which probably is connected with topography of the fiord bottom, ocean tides affected on the glacier front and some processes connected with the ablation water delivery to the glacier bed. This problem requires a detailed study based on environmental data. - The results of determined heights were periodically disrupted by atmospheric conditions (snowing, wind). - The GPS data used to follow the vertical velocity of the glacier surface let us to monitor the glacier with height accuracy. Also the automation of the survey and post-processing is possible. - There are some disadvantages of using this monitoring technology in surveys: one point of observations, influence of atmospheric conditions on the results of surveys, periodically hard access to equipment and not good enough way of installation of the satellite antenna on the glacier (ablation pole).

7

Monitoring of Hans Glacier movement dynamics (Hornsund Sw Spitsbergen, Svalbard)

48%

Walo J. , Puczko D. , Adamek A. , Węzka K. , Malinowski Z. , Rajner M.

Reports on Geodesy

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2006

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tom z. 1/76

173-179

EN

Fast and exact GPS measurements are independent from weather and season of the year. For achieving reliable results, survey should be conducted at least once a month and at least twice a month in summer season (June-September). GPS RTK is suggested for pole movement determination. In case of real-time corrections limited availability (i.e. screening by mountains) using Rapid Static is a good choice. To minimize multipath error antenna should be placed at least 0,5m eccentric to pole and at 1 m height. Ablation pole movement vectors of Hans glacier indicate few relations. Most important feature is speed being about 10 times greater in foremost zone of glacier than in lateral parties of glacier. Measurements of lateral profile indicate that, accordingly to expectations, surface speed of glacier is greater in middle axis comparing to the edges or glacier.