ALBERT

Description: Peatlands extend over vast areas of the northern landscape. Within some of these areas, lakes and ponds are changing in size as a result of permafrost thawing and erosion, resulting in mobilisation of the carbon-rich peatland soils. Our aims in the present study were to characterize the particle, carbon and nutrient regime of a set of thermokarst (thaw) lakes and their adjacent peatland permafrost soils in a rapidly degrading landscape in subarctic Québec, Canada, and by way of fluorescence microscopy, flow cytometry, production measurements and an in situ enrichment experiment, determine the bacterial characteristics of these waters relative to other thaw lakes and rock-basin lakes in the region. The soil active layer in a degrading palsa (peatland permafrost mound) adjacent to one of the lakes contained an elevated carbon content (51 % of dry weight), low C:N ratios (17:1 by mass), and large stocks of other elements including N (3 % of dry weight), Fe (0.6 %), S (0.5 %), Ca (0.5 %) and P (0.05 %). Two permafrost cores were obtained to a depth of 2.78 m in the palsa, and CT scans of the cores confirmed that they contained high concentrations (〉 80 %) of ice. Upon thawing, the cores released nitrate and dissolved organic carbon (from all core depths sampled), and soluble reactive phosphorus (from bottom depths), at concentrations well above those in the adjacent lake waters. The active layer soil showed a range of particle sizes with a peak at 229 µm, and this was similar to the distribution of particles in the upper permafrost cores. The particle spectrum for the lake water overlapped with those for the soil, but extended to larger (surface water) or finer (bottom water) particles. On average, more than 50 % of the bacterial cells and bacterial production was associated with particles 〉 3 µm. This relatively low contribution of free-living cells (operationally defined as the 〈 1 µm fraction) to bacterial production was a general feature of all of the northern lakes sampled, including other thaw lakes and shallow rock-basin lakes (average ± SE of 25 ± 6 %). However, a distinguishing feature of the peatland thaw lakes was significantly higher bacterial specific growth rates, which averaged 4 to 7 times higher values than in the other lake types. The in situ enrichment experiment showed no no difference between organic carbon or phosphorus enrichment treatments at day 5 relative to the control, however there was a significant, 〉 100 % increase in bacterial growth rates between days 1 and 5 in the soil and the carbon plus phosphorus enrichments. Collectively these results indicate that particles, nutrients and carbon are released by degrading permafrost peatland soils into their associated thermokarst lakes, creating favorable conditions for production by particle-based as well as free-living aquatic bacterial communities. The reduced bacterial concentrations despite high cellular growth rates imply that there is strong control of their population size by loss-related factors such as grazing and viral lysis.

Description: Peatlands extend over vast areas of the northern landscape. Within some of these areas, lakes and ponds are changing in size as a result of permafrost thawing and erosion, resulting in mobilization of the carbon-rich peatland soils. Our aims in the present study were to characterize the particle, carbon and nutrient regime of a set of thermokarst (thaw) lakes and their adjacent peatland permafrost soils in a rapidly degrading landscape in subarctic Québec, Canada, and by way of fluorescence microscopy, flow cytometry, production measurements and an in situ enrichment experiment, determine the bacterial characteristics of these waters relative to other thaw lakes and rock-basin lakes in the region. The soil active layer in a degrading palsa (peatland permafrost mound) adjacent to one of the lakes contained an elevated carbon content (51 % of dry weight), high C : N ratios (17 : 1 by mass), and large stocks of other elements including N (3 % of dry weight), Fe (0.6 %), S (0.5 %), Ca (0.5 %) and P (0.05 %). Two permafrost cores were obtained to a depth of 2.77 m in the palsa, and computerized tomography scans of the cores confirmed that they contained high concentrations (〉 80 %) of ice. Upon thawing, the cores released nitrate and dissolved organic carbon (from all core depths sampled), and soluble reactive phosphorus (from bottom depths), at concentrations well above those in the adjacent lake waters. The active layer soil showed a range of particle sizes with a peak at 229 µm, and this was similar to the distribution of particles in the upper permafrost cores. The particle spectrum for the lake water overlapped with those for the soil, but extended to larger (surface water) or finer (bottom water) particles. On average, more than 50 % of the bacterial cells and bacterial production was associated with particles 〉 3 µm. This relatively low contribution of free-living cells (operationally defined as the

Description: Dieses Projekt startete im Oktober 2015 mit einer verrückten Idee: Schreiben und Einreichen eines Antrags auf Förderung einer internationalen, multidisziplinären und nicht-traditionell wissenschaftlichen Projektinitiative… innerhalb von 48 Stunden. Und es hat geklappt ! Eine Gruppe hoch motivierter, junger Forscher aus Kanada und Europa hat sich gebildet, um Kunst und Wissenschaft zu kombinieren und eine Reihe von Comics über Permafrost (gefrorene Böden) zu produzieren. Unser Ziel ist es, zu zeigen, wie wissenschaftliches Arbeiten im hohen Norden funktioniert, mit dem Schwerpunkt auf Geländearbeit und den schnellen Umweltveränderungen in der Arktis. Die Zielgruppe sind Kinder, Jugendliche, Eltern und Lehrer, mit dem allgemeinen Ziel, Permafrost zugänglicher und mit Spaß zu vermitteln. Denn ratet mal: Permafrost ist ein Gebiet von mehr als 20 Millionen km2 auf der Nordhalbkugel – ein riesiges Gebiet. Durch die Klimaerwärmung taut der Permafrost und wird zu instabil, um Häuser, Straßen und Flughäfen zu tragen. Durch das Auftauen von gefrorenem Boden werden außerdem Pflanzen- und Tierhabitate zerstört, die Wasserqualität und Ökologie von Seen beeinflusst und auf Grund der Freisetzung von Kohlenstoff als Treibhausgas in die Atmosphäre wird der Klimawandel sogar verstärkt. Daher betrifft Permafrost und seine Reaktion auf den Klimawandel uns alle. Die Internationale Permafrost Gemeinschaft (IPA) hat das Projekt als „Action Group“ von Beginn an unterstützt und seitdem sind noch viele weitere Sponsoren dazugekommen. Und hier sind wir nun: Zwei Jahre nach der ersten Idee. Ihr seid kurz davor das zu lesen, was das Ergebnis eines ständigen Austauschs zwischen Künstlern und Wissenschaftlern ist. Zunächst hatten wir eine Ausschreibungsrunde und erhielten 49 Bewerbungen von Künstlern aus 16 Ländern. Durch ein Bewertungsverfahren wählten wir zwei Künstlerinnen aus, um an diesem Projekt zu arbeiten: Noémie Ross aus Kanada und Heta Nääs aus Finnland. Mit den Beiträgen von Wissenschaftlern erstellten Noémie und Heta fantastische Cartoons, die ein paar der Veränderungen erklären, die in Permafrost-Gebieten passieren. Zum Beispiel: wie wird die Welt der Menschen und Tiere beeinflusst und was machen Forscher, um diese Prozesse besser zu verstehen, sodass sie den Einheimischen helfen können, innovative Wege zur Anpassung zu finden.

Description: 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.

Description: 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.