Grzegorz Rachlewicz

Adam Mickiewicz University | UAM · Institute of Geoecology and Geoinformation

Rozdział w Kronice Miasta Poznania 2/2022 (Wydawnictwo Miejskie Posnania), w tomie zatytułowanym: "Radojewo i Morasko" (red. F. Kaczmarek)

Quantitative measurements of aeolian activity at high latitudes are not currently carried out on a large scale, even though these processes are important elements of the geomorphic system of polar regions, which are particularly affected by climate change. This study presents the results of aeolian deposition rates measured and calculated for one o...

Moreno-Ibáñez M, Hagen JO, Hübner C, Lihavainen H, Zaborska A (eds) 2021: SESS report 2020, Svalbard Integrated Arctic Earth Observing System, Longyearbyen

Arctic sea ice extent (SIE) is declining at an accelerating rate with a wide range of ecological consequences. However, determining sea ice effects on tundra vegetation remains a challenge. In this study, we examined the universality or lack thereof in tundra shrub growth responses to changes in SIE and summer climate across the Pan-Arctic, taking...

Aeolian activity is common on ice free areas in regions with permafrost occurrence. Sparse high-Arctic tundra vegetation, modifying surface air flow and sediments transport, influences the generation of individual landforms and their assemblages. Observations were carried in central Spitsbergen (Svalbard), characterized by quasi-continental polar c...

The aim of this article is to show geomorphological mapping of remote Antarctic locations using images taken by a fixed-wing unmanned aerial vehicle (UAV) during the Beyond Visual Line of Sight (BVLOS) operations. We mapped landform assemblages developed in forelands of Ecology Glacier (EGF), Sphinx Glacier (SGF) and Baranowski Glacier (BGF) in Ant...

This study attempts to answer the following question: can the LST values based on satellite data be used to model spatial distribution and seasonal variability of Svalbard air temperature? In this work the LST from MODIS sensor contained in MOD11A1 and MYD11A1 products and the monthly average AT data obtained for the 38 measurement stations existin...

The aim of the study was to identify and quantify the significance of terrain and atmospheric circulation factors influencing the seasonal variability of LST in the archipelago. In this analysis, LST timely data from MODIS sensor operating on Terra and Aqua satellites (4 measurements per day) from 2000-2019 were aggregated to monthly periods. It co...

A 1:850 detailed map of the geomorphology of the Dynamisk Creek alluvial fan on Svalbard was produced based on very high-resolution data collected using an unmanned aerial vehicle (UAV) in 2014. The map documents features within the surface of the fan (0.35 km²), emphasizing their relative temporal activity. Fluvial flows were the most important ge...

W niniejszym artykule dokonano przeglądu i podsumowania dorobku polskich badań meteorologicznych i klimatologicznych w obszarach polarnych. Ponieważ ich historia liczy już sto dwadzieścia lat, nie jest to pierwsza próba takiej syntezy. Niemniej nigdy wcześniej, nie licząc opracowania Przybylaka (2000a) ograniczonego terytorialnie tylko do Spitsberg...

This article reviews and summarises the achievements of Polish meteorological and climatological research in polar regions. In summarising the many years of organisational and publishing achievements of Polish polar researchers in meteorology and climatology, it should be emphasised that: 1. There have been four distinct periods (waves) of high ac...

Despite over 40 years of scientific activitiity, the recognition and understanding of ground thermal conditions in the surroundings of Henryk Arctowski Polish Antarctic Station is rather poor. To date, the only data on ground temperatures were based on seasonal observations carried out in the weather station (Kejna and Láska 1999, Kruszewski G. 200...

All 43 caves with perennial ice cover confirmed in the last years of the 20th century in Poland were located in the Tatra Mountains, which are part of the only mountain chain in Poland characterized by high-mountain morphology and climate. They were glaciated during the Pleistocene Epoch; however, they lack modern glaciers. The ice caves there exce...

The aim of the study was to identify and quantify the significance of geographical factors influencing the seasonal variability of LST in the archipelago. Geographic coordinates (latitude and longitude, height above sea level), terrain slope, direct and diffuse solar radiation, distance from water and open sea, land cover type were potentially sign...

A comparative study of the three bedload traps was accomplished to determine the effectiveness differences between the devices. The research was carried out in two transverse sections of the proglacial, gravel-bedded Scott River (SW Svalbard) using three devices to perform direct measurements of bedload transport in the river channels. Several samp...

Textural properties and microstructures are commonly used properties in the analysis of Pleistocene and older glacial deposits. However, contemporary glacial deposits are seldom studied, particularly in the context of post-depositional changes. This paper presents the results of a micromorphological study of recently deposited tills in the marginal...

This work provides the first results on activity concentrations, inventories and activity ratios of the artificial and natural fallout (¹³⁷Cs, ²³⁸Pu, ²³⁹⁺²⁴⁰Pu, ²⁴¹Am, ²¹⁰Pb) and lithogenic radionuclides (²²⁶Ra, ²²⁸Ra, ⁴⁰K) in soils and lake sediments of the inland Spitsbergen. The depths of activity peaks of the artificial radionuclides point to a...

Amplified climate change and ecological sensitivity of polar and cold climate environments are key global environment issues. Understanding how projected climate change will alter surface environments in these regions is only possible when present-day source-to-sink fluxes can be quantified. The book provides the first global synthesis and integrat...

Amplified climate change and ecological sensitivity of polar and cold climate environments are key global environment issues. Understanding how projected climate change will alter surface environments in these regions is only possible when present-day source-to-sink fluxes can be quantified. The book provides the first global synthesis and integrat...

Soils in Arctic regions currently enjoy attention because of their sensitivity to climate change. It is therefore important to understand the natural processes and rates of development of these soils. Specifically, there is a need to quantify the rates and interactions between various landscape- and soil-forming processes. Soil chronosequences are...

Growing season conditions are widely recognized as the main driver for tundra shrub radial growth, but the effects of winter warming and snow remain an open question. Here, we present a more than 100 years long Betula nana ring-width chronology from Disko Island in western Greenland that demonstrates a highly significant and positive growth respons...

In this article, the results of an investigation into the air temperature conditions on Svalbard in the period 1 September 2010 to 31 August 2011 are presented. For this period, parallel temperature measurements have been made as many as in 30 sites. On the basis of this unique set of data it was possible to study, in detail, the spatial distributi...

A series of investigations of water and sediment discharge from the glacierized Ebba River catchment (53 km2, located in the Billefjorden area in the central part of Spitsbergen) was carried out during the ablation seasons of 2008–2010 The study included hydrometric measurements at the catchment closing profile, identification of meteorological fac...

During the period between summer 2009 and summer 2012 measurements of ground temperature in active layer of permafrost were conducted. Studies were realised in Ebba valley (central Spitsbergen). For this part of Svalbard archipelago dry polar climate type is distinctive. Variat ions in the ground temperatures had a typical course in the summer mont...

Paper described geomorphological characteristics of landform sets which occur on research areas investigated by Polish geomorphologists on Spitsbergen. These area involve four areas along the western coast of Spitsbergen, i.e. vicinities of the Kaffiøyra, the Werenskioldbreen, the Calyp-sostranda, and the Hornsund, as wel as one area located in the...

Arctic ecosystems are important carbon sinks. Increasing temperatures in these regions might stimulate soil carbon release. Evidence suggests that deciduous shrubs might counteract these carbon losses because they positively respond to increasing temperature, but their role in ecosystem carbon budgets remains uncertain. Many studies dealing with la...

Recent warming is expected to dramatically modify the arctic terrestrial ecosystem and woody plants growth. Many studies dealing with Arctic shrubs growth responses to temperature usually base their estimations on biomass measurements of only the above-ground segments neglecting the below-ground growth. In this context, the study of shrub-rings can...

Vegetation succession in front of five retreating glaciers was studied using phytosociological releves (60) located at different distances between the Little Ice Age (LIA) moraines and the present glacier fronts around Petunia Bay. Approximate dating of succession stages was based on a study of the changing position of glacier fronts in the past ap...

The tsunami deposits left by the 26 December 2004 tsunami in the coastal zone of Thailand were studied within two months of the event and before any significant postdepositional changes could occur. The sediment structure and texture (grain size), as well as its thickness and spatial distribution, were documented for the tsunami deposits in 12 shor...

The paper summarizes over 25 years of research concerning the present-day dynamics of processes shaping polar landscapes due to gravity, water circulation and routing in glacial, periglacial and paraglacial realms. Morphogenetic activity is shown on the example of the partly deglaciated high Arctic Ebba River valley and neighbourhoods, located in t...

Samples of water from small tundra lakes located on raised marine terraces on the eastern coast of Petuniabukta (Ebbadalen, Central Spitsbergen) were examined to assess the changes in water chemistry that had occurred during the summer seasons of 2001-2003 and 2006. The unique environmental conditions of the study region include the predominance of...

Prezentowany tekst jest po części oparty na wcześniejszym artykule A. Kostrzewskiego i G. Rachlewicza (Kostrzewski A., Rachlewicz G., 2008. Stowarzyszenie Geomorfologów Polskich. W: A. Jackowski, S. Liszewski, A. Richling (red.), Historia geografii polskiej. Wydawnictwo Naukowe PWN, Warszawa, s. 515–520) oraz na sprawozdaniach prezesów SGP: A. Kost...

Paraglacial Modifications of Glacial Sediments Over Millennial to Decadal Time-Scales in the High Arctic (Billefjorden, Central Spitsbergen, Svalbard) The paper discuss the morphologic expression and sedimentological record left after the operation of glacial episodes in the area of Billefjorden, central Spitsbergen, in the period of Late Pleistoce...

River discharge from partly glacier-covered catchments is controlled by its storage on various time scales and its release from ice and snow during melt-out. These discharge processes depend on seasonal reactions to meteorological conditions, generating variable river discharge magnitudes, including floods. Four types of meteorologically driven flo...

Rzeźba młodoglacjalna wraz z retuszem morfogenezy holoceńskiej należy do najmłodszych na terenie Polski. Obszary o tym typie rzeźby rozciągają się w północnej części kraju pomiędzy strefą staroglacjalną na południu, a na północy wybrzeżem Bał-tyku (ryc. 8.1). Cały obszar młodoglacjalny na obszarze Polski należy do Niżu Zachod-nioeuropejskiego. Pod...

Arctic wetlands reflect considerable contemporary environmental changes relating to climate warming, such as growing extent of paraglacial area and increase of active layer thickness. Small tundra lakes and ponds located within the system of raised marine terraces on the eastern coast of Petuniabukta (the northern tip of Billefjorden in Central Spi...

The relationships between meteorological conditions, permafrost active layer thickness and thermal structure were studied for a dry, polar climate site, next to Petunia− bukta (central Spitsbergen), during four successive summer seasons (2000–2003). In addi− tion to determination of the ground sedimentological and mineralogical properties, the fol−...

Niepowtarzalność krajobrazu polarnej strefy ark- tycznej i antarktycznej manifestuje się w morfolo- gicznych śladach starszych zlodowaceń i transgresji morskich, obszarami dzisiejszych zlodowaceń i ich zmienną deglacjacją w czasie i przestrzeni, wielolet- nią zmarzliną, wieloletnimi pokrywami śnieżnymi, ekspansją obszarów wolnych od lodu, wielokier...

The objective of this paper is to present the conditions and style of functioning of the geoecosystems of tundra lakes. An analysis of their functioning has been based on the diversification and variability of water chemistry and the sedimentological and geochemical properties of lacustrine deposits, which fill the basins of a number of lakes on th...

Twelve glaciers, representing various types, were investigated between 2000 and 2005, in a region adjacent to the northern reaches of Billefjorden, central Spitsbergen ( Svalbard ). On the basis of measurements taken using reference points, DGPS and GPS systems, analyses of aerial photographs and satellite images, geomorphological indicators and ar...

The 26 December 2004 tsunami covered significant portion of a coastal zone with a blanket of potentially contaminated sediments. In this report are presented results on mercury concentrations in sediments deposited by the tsunami in a coastal zone of Thailand. Since the total mercury concentrations are insufficient to assess mercury mobility and bi...