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This project started in October 2015 with a crazy idea : prepare and submit a funding application for an international, multidisciplinary and non-traditional scientific outreach project… within the next 48 hours. Well, it worked out. A group of highly motivated young researchers from Canada and Europe united to combine arts and science and produce a series of outreach comic strips about permafrost (frozen ground). The aim of the project is to present and explain scientific research conducted across the circumpolar Arctic, placing emphasis on field work and the rapidly changing northern environment. The target audience is kids, youth, parents and teachers, with the general goal of making permafrost science more fun and accessible to the public. Because guess what : permafrost represents an area of more than twenty million km2 in the Northern Hemisphere, a huge area. As the climate warms, permafrost thaws and becomes unstable for houses, roads and airports. This rapid thawing of previously frozen ground also disrupts plant and animal habitats, impacts water quality and the ecology of lakes, and releases carbon into the atmosphere as greenhouse gases, making climate change even stronger. Hence permafrost and its response to climate change concerns us all. The project received initial support from the International Permafrost Association (IPA) as a targeted ‘Action Group’, and since then several other sponsors have joined the project. Here we are, now, two years after this first idea. What you are about to read is the result of an iterative process of exchanging ideas between artists and scientists. We first made an application call and received 49 applications from artists in 16 countries. Through a formal review process, we then selected two artists to work on this project: Noémie Ross from Canada, and Heta Nääs from Finland. With input from scientists, Noémie and Heta created fantastic cartoons that explain some of the changes happening to the environment in permafrost areas, how they affect people and wildlife, and what scientists are doing to better understand these changes to help people find innovative ways to adapt. We wish everyone plenty of fun reading this booklet and we would like to thank all those who supported this project.

A lasting legacy of the International Polar Year (IPY) 2007–2008 was the promotion of the Permafrost Young Researchers Network (PYRN), initially an IPY outreach and education activity by the International Permafrost Association (IPA). With the momentum of IPY, PYRN developed into a thriving network that still connects young permafrost scientists, engineers, and researchers from other disciplines. This research note summarises (1) PYRN’s development since 2005 and the IPY’s role, (2) the first 2015 PYRN census and survey results, and (3) PYRN’s future plans to improve international and interdisciplinary exchange between young researchers. The review concludes that PYRN is an established network within the polar research community that has continually developed since 2005. PYRN’s successful activities were largely fostered by IPY. With >200 of the 1200 registered members active and engaged, PYRN is capitalising on the availability of social media tools and rising to meet environmental challenges while maintaining its role as a successful network honouring the legacy of IPY.

Communicating science about a phenomenon found under ground and defined by its thermal properties in an easy, funny, and engaging way, can be a challenge. Two years ago, a group of young researchers from Canada and Europe united to tackle this problem by combining arts and science to produce a series of outreach comic strips about permafrost (frozen ground). Because this concerns us all. As the climate warms, permafrost thaws and becomes unstable for houses, roads and airports. The thawing also disrupts ecosystems, impacts water quality, and releases greenhouse gases into the atmosphere, making climate change even stronger. The Frozen Ground Cartoon project aims to present and explain permafrost research, placing emphasis on field work and the rapidly changing northern environment. The target audience is kids, youth, parents and teachers, with the general goal of making permafrost science more fun and accessible to the public. The project has so far produced 22 pages of comics through an iterative process of exchanging ideas between two artists and thirteen scientists. The project artists were selected through an application call that received 49 applications from artists in 16 countries. With input from scientists, artists Noémie Ross (Canada) and Heta Nääs (Finland) have created a set of beautiful, artistic, humoristic, and pedagogic comics. The comics are available for free download through the project web page (in English and Swedish), and printed copies have so far been handed out to school kids and general public in Europe and Canada. The next steps of this project are (1) to distribute the comics as wide as possible, (2) work towards translations into more languages, and (3) to evaluate the effectiveness of the science communication through the comics, in collaboration with schools and pedagogic experts.

This project started in October 2015 with a crazy idea : prepare and submit a funding application for an international, multidisciplinary and non-traditional scientific outreach project… within the next 48 hours. Well, it worked out. A group of highly motivated young researchers from Canada and Europe united to combine arts and science and produce a series of outreach comic strips about permafrost (frozen ground). The aim of the project is to present and explain scientific research conducted across the circumpolar Arctic, placing emphasis on field work and the rapidly changing northern environment. The target audience is kids, youth, parents and teachers, with the general goal of making permafrost science more fun and accessible to the public. Because guess what : permafrost represents an area of more than twenty million km2 in the Northern Hemisphere, a huge area. As the climate warms, permafrost thaws and becomes unstable for houses, roads and airports. This rapid thawing of previously frozen ground also disrupts plant and animal habitats, impacts water quality and the ecology of lakes, and releases carbon into the atmosphere as greenhouse gases, making climate change even stronger. Hence permafrost and its response to climate change concerns us all. The project received initial support from the International Permafrost Association (IPA) as a targeted ‘Action Group’, and since then several other sponsors have joined the project. Here we are, now, two years after this first idea. What you are about to read is the result of an iterative process of exchanging ideas between artists and scientists. We first made an application call and received 49 applications from artists in 16 countries. Through a formal review process, we then selected two artists to work on this project: Noémie Ross from Canada, and Heta Nääs from Finland. With input from scientists, Noémie and Heta created fantastic cartoons that explain some of the changes happening to the environment in permafrost areas, how they affect people and wildlife, and what scientists are doing to better understand these changes to help people find innovative ways to adapt. We wish everyone plenty of fun reading this booklet and we would like to thank all those who supported this project.

Apart from people in cold region communities and a small – although steadily growing – scientific community, the general public knows very little about permafrost properties, its dynamics in response to climate change, and the research going on in the field. We are addressing this by making permafrost science accessible to children, youth, their parents, and teachers. We are producing a 100% outreach-related project that aims at ‘Fostering permafrost research to the ends of the Earth’ (http://ipa.arcticportal.org), but with a casual approach via a series of comic strips. Cartoons are excellent ways to communicate messages in today’s media landscape: they are graphic, funny and direct, and can be rapidly shared via social media to reach many people. Our outreach project targets the general public, focusing on young students who have to choose career paths at the high school or college levels. By introducing them to permafrost research activities, particularly fieldwork, our ‘Frozen-Ground Cartoon’ will enhance the dissemination of permafrost knowledge and broaden the international community of permafrost ‘lovers’. This new project is coordinated by a core group of permafrost early career researchers from Canada, Germany, Sweden and Portugal (in collaboration with an ‘external senior advisor’), and is endorsed by the International Permafrost Association (IPA) as a targeted ‘Action Group’ (http://ipa.arcticportal.org/activities/action-groups). Here we present an overview of our Action Group, including main objectives, significance, and potential future outcomes.

Over the past two decades, the International Arctic Science Committee (IASC) and the Scientific Committee on Antarctic Research (SCAR) have organized activities focused on international and interdisciplinary perspectives for advancing Arctic and Antarctic research cooperation and knowledge dissemination in many areas (e.g. Kennicutt et al., 2014). For permafrost science, however, no consensus document exists at the international level to identify future research priorities, although the International Permafrost Association (IPA) highlighted the need for such a document during the 10th International Conference on Permafrost in 2012. Four years later, this presentation, which is based on the results obtained by Fritz et al. (2015), outlines the outcome of an international and interdisciplinary effort conducted by early career researchers (ECRs). This effort was designed as a contribution to the Third International Conference on Arctic Research Planning (ICARP III). In June 2014, 88 ERCs convened during the Fourth European Conference on Permafrost to identify future priorities for permafrost research. We aimed to meet our goals of hosting an effective large group dialogue by means of online question development followed by a “World Café” conversational process. An overview of the process is provided in Figure 1. This activity was organized by the two major early career researcher associations Permafrost Young Researchers’ Network (PYRN) and the Association of Polar Early career Scientists (APECS), as well as the regional research projects PAGE21 (EU) and ADAPT (Canada). Participants were provided with live instructions including criteria regarding what makes a research question (Sutherland et al., 2011). The top five questions that emerged from this process are: (1) How does permafrost degradation affect landscape dynamics at different spatial and temporal scales? (2) How can ground thermal models be improved to better reflect permafrost dynamics at high spatial resolution? (3) How can traditional environmental knowledge be integrated in permafrost research? (4) What is the spatial distribution of different ground-ice types and how susceptible is ice-rich permafrost to future environmental change? (5) What is the influence of infrastructures on the thermal regime and stability of permafrost in different environmental settings? As the next generation of permafrost researchers, we see the need and the opportunity to participate in framing the future research priorities. Across the polar sciences, ECRs have built powerful networks, such as the Association of Polar Early Career Scientists (APECS) and the Permafrost Young Researchers Network (PYRN), which have enabled us to efficiently consult with the community. Many participants of this community-input exercise will be involved in and also affected by the Arctic science priorities during the next decade. Therefore, we need to (i) contribute our insights into larger efforts of the community such as the Permafrost Research Priorities initiative by the Climate and Cryosphere (CliC) project together with the IPA and (ii) help identify relevant gaps and a suitable roadmap for the future of Arctic research. Critical evaluation of the progress made since ICARP II and revisiting the science plans and recommendations will be crucial. IASC and the IPA, together with SCAR on bipolar activities, should coordinate the research agendas in a proactive manner engaging all partners, including funding agencies, policy makers, and local communities. Communicating our main findings to society in a dialogue between researchers and the public is a priority. Special attention must be given to indigenous peoples living on permafrost, where knowledge exchange creates a mutual benefit for science and local communities. The ICARP III process is an opportunity to better communicate the global importance of permafrost to policy makers and the public.

A 5.4m long sediment core was collected from Belbín, a karstic depression dammed by a moraine in a mid-altitude environment in the Western Massif of the Picos de Europa of the Cantabrian Mountains, northern Spain. 14C AMS dating of the basal sediments in the core suggests that the maximum glacier advance during the last glacial cycle preceded the global Last Glacial Maximum and occurred prior to 37.2 ka cal BP. Four environmental stages are reconstructed from analysis of the sediment core and in particular the surface microstructures on quartz sand grains: (1) 37.2–29.4 ka was characterised by intense periglacial activity with deposition of slope deposits; (2) 29.4–22.6 ka saw the gradual infilling of the depression with sediment; (3) 22.6–8.1 ka was associated with a palaeolake; and (4) since 8.1 ka, terrestrialisation of the palaeolake commenced, and human impact related to fire activity started around 4.9 ka. Microstructures on the surface of quartz grains suggest different intensity patterns of frost weathering processes in response to Late Quaternary climate oscillations.

The Permafrost Young Researchers Network (PYRN, pyrn.arcticportal.org) is an international network fostering innovative collaboration, seeking to recruit, retain, and promote future generations of permafrost researchers. Established in 2005, in the framework of the 2nd International Conference on Arctic Research Planning (ICARP II), PYRN is evolving and expanding its network, bringing together young and enthusiastic permafrost scientists from all around the world (Fig. 1) to exchange ideas and knowledge. We strongly benefit from our cooperation with the Association of Polar Early Career Scientists (APECS) and our overarching organization, the International Permafrost Association (IPA), as well from partnerships with Climate and Cryosphere Project (CliC) and Polar Educators International (PEI). Currently about 1,200 members are involved in PYRN, including young researchers from natural and social science, engineering and humanities. By bringing together these different disciplines, PYRN fosters research on how the arctic, antarctic and mountain permafrost regions play a key role in the Earth’s system. It has long been acknowledged that early career scientists need to be included in future polar activities since they develop, direct, and realize ideas; they frame upcoming projects, and find answers to the rising questions in our scientific frame. In the framework of large organizational activities, like the 4th International Polar Year in 2007-2008 or ICARPIII, we are able to give PYRN members a voice. Over the past years, PYRN hosted workshops during regional and international permafrost conferences. It is increasingly present at such conferences with sessions and social network events. The latest activities have been arranged at the European Conference on Permafrost (EUCOP4) in Évora/Portugal. Here, a workshop for around 100 early career permafrost scientists from 20 countries was jointly organized by PYRN, APECS, PAGE21 (Changing Permafrost in the Arctic and its Global Effects in the 21st Century), and ADAPT (Arctic Development and Adaptation to Permafrost in Transition) - kindly sponsored by the IPA, CliC, the International Arctic Science Committee (IASC), and the Bolin Centre for Climate Research. Besides break-out sessions of interest for young researchers developing their career in polar science, an activity in the form of a “World Café” was conducted to raise cutting edge research questions. Mentored by IASC and the IPA, the major goal of the activity was to elaborate on the future avenues of permafrost research from a young researchers' perspective. The outcome contributes directly to the IASC and IPA strategy through a “Permafrost Priority Sheet” for the ICARP III. During the current election period 2014-2016, PYRN celebrates its 10th year of existence. A number of important events where PYRN actively participate in the form of workshops and presentations will take place, including the EGU, AGU, the Regional Conference on Geography (Moscow), and ICOP 2016 (Potsdam). New goals have been set up for means to develop the PYRN network, e.g. through innovative outreach projects and website amelioration and revival.

Accelerating climate change and increased economic and environmental interests in permafrost-affected regions have resulted in an acute need for more directed permafrost research. In June 2014, 88 early career researchers convened to identify future priorities for permafrost research. This multidisciplinary forum concluded that five research topics deserve greatest attention: permafrost landscape dynamics, permafrost thermal modeling, integration of traditional knowledge, spatial distribution of ground ice, and engineering issues. These topics underline the need for integrated research across a spectrum of permafrost-related domains and constitute a contribution to the Third International Conference on Arctic Research Planning (ICARP III).

El programa de monitoreo de capa activa (CALM) fue desarrollado en las últimas décadas con la finalidad de comprender el impacto del cambio climático sobre los ambientes con permafrost. Este trabajo analiza los resultados obtenidos, en los últimos seis años, de los sitios CALM-S Irizar, Cráter Lake y Refugio Chileno, ubicados en Isla Decepción. En ellos se ha medido el espesor, el estado térmico y la distribución espacial de la capa activa. En los sitios Irizar y Refugio Chileno la evolución del espesor de capa activa varió interanualmente sin una clara tendencia dentro del corto período analizado; por el contrario, el sitio Cráter Lake evidenció una tendencia a la disminución de espesor. La distribución espacial como el espesor de dicha capa en los tres sitios de monitoreo, mostraron estar condicionados principalmente por la potencia de la cubierta de nieve, la litología y la exposición a los vientos. El relieve, la topografía de detalle, la orientación de las laderas frente a la radiación solar incidente, ejercieron un control menor sobre esta distribución. El estado térmico de la capa activa evidenció el control ejercido sobre ella de la temperatura del aire y de la cubierta nival. Así bajo reducidos espesores de nieve, el modelo de penetración en profundidad de la isoterma de 0 ºC, ha permitido aproximar satisfactoriamente el espesor de capa activa. The Circumpolar Active Layer Monitoring (CALM) program developed over the last two decades has a leading edge in comprehensive efforts to study the impacts of climate change in permafrost environments. This paper describes results obtained during the last six years, on the active layer thickness, thermal regime and spatial patterns of thaw, at the CALM-S Irizar, Crater Lake and Refugio Chileno sites in Deception Island. In Irizar and Refugio Chileno CALM-S sites the active layer depth varied interannually without any clear trend over the short record available. By contrast, Crater Lake CALM-S showed a slight thinning trend. In all sites, the spatial patterns of thaw and active layer thickness were mainly controlled by snow cover conditions, lithology and the effect of aspect on wind. The relief, the detailed topography and the effect of aspect on solar radiation also exert a local control over its patterns. Air temperature and snow cover controlled the thermal state of active layer. In absence of snow, the use of depth penetration model of the 0 ºC isotherm allowed approximated satisfactorily active layer thickness. Fil: Goyanes, Gabriel Alejandro. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Estudios Andinos "Don Pablo Groeber". Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Estudios Andinos "Don Pablo Groeber"; Argentina Fil: Vieira, Gonçalo. Universidad de Lisboa; Portugal Fil: Caselli, Alberto Tomás. Universidad Nacional de Río Negro; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina Fil: Mora, Carla. Universidad de Lisboa; Portugal Fil: Ramos, Miguel Esteban. Universidad de Alcalá; España. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina Fil: de Pablo, Miguel Angel. Universidad de Alcalá; España Fil: Neves, Mario. Universidad de Lisboa; Portugal Fil: Santos, Fernando. Universidad de Lisboa; Portugal Fil: Bernardo, Ivo. Universidad de Lisboa; Portugal Fil: Gilichinsky, David. Academia Rusa de Ciencias; Rusia Fil: Abramov, Andrey. Academia Rusa de Ciencias; Rusia Fil: Batista, Vanessa. Universidad de Lisboa; Portugal Fil: Melo, Raquel. Universidad de Lisboa; Portugal Fil: Nieuwendam, Alexandre. Universidad de Lisboa; Portugal Fil: Ferreira, Alice. Universidad de Lisboa; Portugal Fil: Oliva, Marc. Universidad de Lisboa; Portugal

The Permafrost Young Researchers Network (PYRN) is an international organization fostering innovative collaboration, seeking to recruit, retain and promote future generations of permafrost researchers. PYRN was founded in November 2005 at the International Conference on Arctic Research Planning (ICARP II) and is steadily growing, reaching around 1500 early career permafrost researchers and engineers, many of them from non-permafrost countries. It builds partnerships with large organizations such as the International Permafrost Association (IPA) and the Association of Polar Early Career Scientists (APECS). The IPY 2007/2008 has emphasized the importance of including the young generation of polar researchers in its activities. PYRN and APECS are a direct legacy of the IPY. Under a joint Memorandum of Understanding, PYRN together with the IPA and APECS work closely together on a bi-polar perspective bringing together natural and social scientist, engineers and humanities for a better understanding of cryospheric processes for society and the elaborate representation of these processes in climate models. PYRN is guided by an Executive Committee but run through its members that organize themselves in an international Council, national communities, thematic groups and several groups of interest. Over the past years, PYRN hosted workshops during the regional and international permafrost conferences. It is increasingly present with sessions and social network events on large conferences like the European and American Geophysical Union (EGU, AGU). During the EUCOP4, PYRN will host a workshop to maintain an active, dynamic and growing early career scientific network on permafrost. Organized together with APECS, PAGE21, and ADAPT, this workshop is kindly sponsored by the IPA, the Climate and Cryosphere (CliC) project and the International Arctic Science Committee (IASC). One major workshop focus is to elaborate the future avenues of permafrost research from a young researchers' perspective. One of the key outcomes will be a young researcher contribution to the IPA strategy for ICARP III issued as a “Permafrost Priority Sheet” summarizing the discussions from the forum. This document is envisioned to contribute to an assessment of research priorities from an early career researcher perspective. It will feed into the final ICARP III meeting in Japan 2015, together with contributions from other initiatives. The 11. International Conference on Permafrost in 2016 (Potsdam, Germany) will provide a forum for many young researchers getting involved in a plethora of activities. PYRN has been involved in the conference planning from the very beginning to effectively integrate PYRN members in the process of ICOP2016 organization as well as young researchers activities in the overall conference program (e.g. workshop, PYRN awards, social program). The conference logo has been found through an international competition organized by PYRN and will be presented in Evora.

El programa de monitoreo de capa activa (CALM) fue desarrollado en las últimas décadas con la finalidad de comprender el impacto del cambio climático sobre los ambientes con permafrost. Este trabajo analiza los resultados obtenidos, en los últimos seis años, de los sitios CALM-S Irizar, Cráter Lake y Refugio Chileno, ubicados en Isla Decepción. En ellos se ha medido el espesor, el estado térmico y la distribución espacial de la capa activa. En los sitios Irizar y Refugio Chileno la evolución del espesor de capa activa varió interanualmente sin una clara tendencia dentro del corto período analizado; por el contrario, el sitio Cráter Lake evidenció una tendencia a la disminución de espesor. La distribución espacial como el espesor de dicha capa en los tres sitios de monitoreo, mostraron estar condicionados principalmente por la potencia de la cubierta de nieve, la litología y la exposición a los vientos. El relieve, la topografía de detalle, la orientación de las laderas frente a la radiación solar incidente, ejercieron un control menor sobre esta distribución. El estado térmico de la capa activa evidenció el control ejercido sobre ella de la temperatura del aire y de la cubierta nival. Así bajo reducidos espesores de nieve, el modelo de penetración en profundidad de la isoterma de 0 ºC, ha permitido aproximar satisfactoriamente el espesor de capa activa., Thermal regime and spatial variability of the active layer in Deception Island, Antarctica The Circumpolar Active Layer Monitoring (CALM) program developed over the last two decades has a leading edge in comprehensive efforts to study the impacts of climate change in permafrost environments. This paper describes results obtained during the last six years, on the active layer thickness, thermal regime and spatial patterns of thaw, at the CALM-S Irizar, Crater Lake and Refugio Chileno sites in Deception Island. In Irizar and Refugio Chileno CALM-S sites the active layer depth varied interannually without any clear trend over the short record available. By contrast, Crater Lake CALM-S showed a slight thinning trend. In all sites, the spatial patterns of thaw and active layer thickness were mainly controlled by snow cover conditions, lithology and the effect of aspect on wind. The relief, the detailed topography and the effect of aspect on solar radiation also exert a local control over its patterns. Air temperature and snow cover controlled the thermal state of active layer. In absence of snow, the use of depth penetration model of the 0 ºC isotherm allowed approximated satisfactorily active layer thickness.

Tese de mestrado, GeografiaUniversidade de Lisboa, Faculdade de Letras, 2009 Nível de preservação: critical, Criado em: 2009-11-20 11:53:02, Criado por: super:ULB53, Alterado em: 2009-11-20 12:20:46, Modificado por: super:ULB53 Made available in DSpace on 2010-06-22T09:20:04Z (GMT). No. of bitstreams: 2 20161_ulfl064952_tm.pdf: 5030538 bytes, checksum: e8382339fb4ca961ced5a4c97a993f92 (MD5) 20161.xml: 11436 bytes, checksum: c4a84478c05b006c0cacfea25bb80e7f (MD5) Previous issue date: 2009 Trabalho apoiado pelos projectos PERMAMODEL IPY Permafrost and Active Layer Monitoring and Modelling in Livingston and Deception Islands, Antarctic. Programa Nacional de Investigaciones Antartidas (Espanha), PERMANTAR Permafrost e Variações Climáticas na Antárctida Marítima (Ref. PTDC/CLI/70020/2006) e o Fundo de Apoio à Comunidade Científica da Fundação para a Ciência e Tecnologia.

Fil: Goyanes, Gabriel A. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria; Argentina Fil: Goyanes, Gabriel A. Instituto de Estudios Andinos "Don Pablo Groeber"; Argentina Fil: Goyanes, Gabriel A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina Fil: Vieira, Gonçalo. Universidad de Lisboa; Portugal Fil: Caselli, Alberto Tomás Universidad Nacional de Río Negro; Argentina. Fil: Caselli, Alberto Tomás Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina Fil: Mora, Carla. Universidad de Lisboa; Portugal Fil: Ramos, Miguel E. Universidad de Alcalá; España. Fil: Ramos, Miguel E. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina Fil: de Pablo, Miguel A. Universidad de Alcalá; España Fil: Neves, Mario. Universidad de Lisboa; Portugal Fil: Santos, Fernando. Universidad de Lisboa; Portugal Fil: Bernardo, Ivo. Universidad de Lisboa; Portugal Fil: Gilichinsky, David. Academia Rusa de Ciencias; Rusia Fil: Abramov, Andrey. Academia Rusa de Ciencias; Rusia Fil: Batista, Vanessa. Universidad de Lisboa; Portugal Fil: Melo, Raquel. Universidad de Lisboa; Portugal Fil: Nieuwendam, Alexandre. Universidad de Lisboa; Portugal Fil: Ferreira, Alice. Universidad de Lisboa; Portugal Fil: Oliva, Marc. Universidad de Lisboa; Portugal The Circumpolar Active Layer Monitoring (CALM) program developed over the last two decades has a leading edge in comprehensive efforts to study the impacts of climate change in permafrost environments. This paper describes results obtained during the last six years, on the active layer thickness, thermal regime and spatial patterns of thaw, at the CALM-S Irizar, Crater Lake and Refugio Chileno sites in Deception Island. In Irizar and Refugio Chileno CALM-S sites the active layer depth varied interannually without any clear trend over the short record available. By contrast, Crater Lake CALM-S showed a slight thinning trend. In all sites, the spatial patterns of thaw and active layer thickness were mainly controlled by snow cover conditions, lithology and the effect of aspect on wind. The relief, the detailed topography and the effect of aspect on solar radiation also exert a local control over its patterns. Air temperature and snow cover controlled the thermal state of active layer. In absence of snow, the use of depth penetration model of the 0 ºC isotherm allowed approximated satisfactorily active layer thickness. El programa de monitoreo de capa activa (CALM) fue desarrollado en las últimas décadas con la finalidad de comprender el impacto del cambio climático sobre los ambientes con permafrost. Este trabajo analiza los resultados obtenidos, en los últimos seis años, de los sitios CALM-S Irizar, Cráter Lake y Refugio Chileno, ubicados en Isla Decepción. En ellos se ha medido el espesor, el estado térmico y la distribución espacial de la capa activa. En los sitios Irizar y Refugio Chileno la evolución del espesor de capa activa varió interanualmente sin una clara tendencia dentro del corto período analizado; por el contrario, el sitio Cráter Lake evidenció una tendencia a la disminución de espesor. La distribución espacial como el espesor de dicha capa en los tres sitios de monitoreo, mostraron estar condicionados principalmente por la potencia de la cubierta de nieve, la litología y la exposición a los vientos. El relieve, la topografía de detalle, la orientación de las laderas frente a la radiación solar incidente, ejercieron un control menor sobre esta distribución. El estado térmico de la capa activa evidenció el control ejercido sobre ella de la temperatura del aire y de la cubierta nival. Así bajo reducidos espesores de nieve, el modelo de penetración en profundidad de la isoterma de 0 ºC, ha permitido aproximar satisfactoriamente el espesor de capa activa.

Mid-Late Holocene environmental changes in the Cantabrian Mountains are a consequence of both climate variability and human activity. A 182cm-long sedimentary sequence was collected from Belbín depression, Western Massif of Picos de Europa (Cantabrian Mountains, NW Spain), in order to reconstruct Holocene environmental dynamics and the factors triggering landscape changes in the area. Using multi-proxy analysis of the uppermost 60cm of the sediments (texture, organic matter content, quartz grains microstructures, charcoal deposition) together with three 14C AMS dates, a sequence of alternating warmer and colder phases has been inferred for the last ca. 6.7kycalBP. Warm stages are defined by low to moderate chemical weathering of the quartz grain particles with relative increases of the C/N ratio, while colder phases show a moderate to intense physical weathering of the quartz grains and lower C/N ratios. Warmer temperatures were recorded in Belbín area between: 6.7-5, 3.7-3, 2.6-1.1, 0.87-0.51 and since 0.01kycalBP. A colder regime occurred between 5-3.7, 3-2.6, 1.1-0.87 and 0.51 to 0.01kycalBP. The increasing organic matter content during the Late Holocene may be associated with increasing temperatures. The charcoal particles do not show a higher or lower concentration during prevailing colder or warmer conditions, and therefore may be linked to human-induced fire management of the landscape. The most intense period with fire activity occurred between 3.5 and 3kycalBP during the Bronze Age., The authors acknowledge the support for field logistics provided by the National Park of Picos de Europa. Alexandre Nieuwendam thanks the Portuguese Science Foundation (Fundação para a Ciência e a Tecnologia, Portugal) for funding a PhD fellowship during which this paper has been written