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Author Rune Dietz, Simon Wilson, Lisa L. Loseto, Aurélien Dommergue, Zhouqing Xie, Christian Sonne, John Chételat doi  openurl
  Title Special issue on the AMAP 2021 assessment of mercury in the Arctic Type Journal
  Year 2022 Publication Science of The Total Environment Abbreviated Journal  
  Volume 843 Issue Pages 157020  
  Keywords Biological effects Climate change Human health Indigenous participation Mercury cycle  
  Abstract This Editorial presents an overview of the Special Issue on advances in Arctic mercury (Hg) science synthesized from the 2021 assessment of the Arctic Monitoring and Assessment Programme (AMAP). Mercury continues to travel to Arctic environments and threaten wildlife and human health in this circumpolar region. Over the last decade, progress has been achieved in addressing policy-relevant uncertainties in environmental Hg contamination. This includes temporal trends of Hg, its transport to and within the Arctic, methylmercury cycling, climate change influences, biological effects of Hg on fish and wildlife, human exposure to Hg, and forecasting of Arctic responses to different future scenarios of anthropogenic Hg emissions. In addition, important contributions of Indigenous Peoples to Arctic research and monitoring of Hg are highlighted, including through projects of knowledge co-production. Finally, policy-relevant recommendations are summarized for future study of Arctic mercury. This series of scientific articles presents comprehensive information relevant to supporting effectiveness evaluation of the United Nations Minamata Convention on Mercury.  
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  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0048-9697 ISBN Medium  
  Area Expedition Conference  
  Notes Approved yes  
  Call Number Serial 8438  
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Author Chuxian Li, Maxime Enrico, Oliver Magand, Beatriz F. Araujo, Gaël Le Roux, Stefan Osterwalder, Aurélien Dommergue, Yann Bertrand, Jérôme Brioude, François De Vleeschouwer, Jeroen E. Sonke doi  openurl
  Title A peat core Hg stable isotope reconstruction of Holocene atmospheric Hg deposition at Amsterdam Island (37.8oS) Type Journal
  Year 2023 Publication Geochimica et Cosmochimica Acta Abbreviated Journal  
  Volume 341 Issue Pages 62-74  
  Keywords Hg deposition Hg stable isotopes Peat Rain Southern Hemisphere  
  Abstract Mercury (Hg) stable isotopes have been broadly used to investigate the sources, transformation and deposition of atmospheric Hg during the industrial era thanks to the multiple isotope signatures deriving from mass-dependent (represented by δ202Hg) and mass-independent fractionation (represented by ΔxxxHg) in the environment. Less is known about the impact of past climate change on atmospheric Hg deposition and cycling, and whether Hg isotopes covary with past climate. Here, we investigate Hg concentration and Hg isotope signatures in a 6600-year-old ombrotrophic peat record from Amsterdam Island (AMS, 37.8oS), and in modern AMS rainfall and gaseous elemental Hg (Hg0) samples. Results show that Holocene atmospheric Hg deposition and plant Hg uptake covary with dust deposition, and are both lower under a high humidity regime associated with enhanced Southern Westerly Winds. Modern AMS gaseous Hg0 and rainfall HgII isotope signatures are similar to those in the Northern Hemisphere (NH). Holocene peat Δ199Hg and Δ200Hg are significantly correlated (R2 = 0.67, P < 0.001, n = 58), consistently oscillating between the modern Hg0 and rainfall HgII end-members. Peat Δ200Hg and Δ199Hg provide evidence of plant uptake of Hg0 as the dominant pathway of Hg deposition to AMS peatland, with some exceptions during humid periods. In contrast to NH archives generally documenting a modern increase in Δ199Hg, recent peat layers (post-1900CE) from AMS show the lowest Δ199Hg in the peat profile (−0.42 ± 0.27 ‰, 1σ, n = 8). This likely reflects a significant change in the post-depositional process on deposited anthropogenic Hg in 20th century (i.e. dark abiotic reduction), enabling more negative Δ199Hg to be observed in AMS peat. We further find that the oscillations of Hg isotopes are consistent with established Holocene climate variability from dust proxies. We suggest peat Hg isotope records might be a valid rainfall indicator.  
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  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0016-7037 ISBN Medium  
  Area Expedition Conference  
  Notes Approved yes  
  Call Number Serial 8527  
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Author Christopher Hoang, Olivier Magand, Jérôme Brioude, Andrea Dimuro, Christophe Brunet, Claudine Ah-Peng, Yann Bertrand, Aurelien Dommergue, Ying Duan Lei, Frank Wania doi  openurl
  Title Probing the limits of sampling gaseous elemental mercury passively in the remote atmosphere Type Journal
  Year 2023 Publication Environmental Science: Atmospheres Abbreviated Journal  
  Volume 3 Issue 2 Pages 268-281  
  Keywords  
  Abstract Reliably recording very low ambient concentrations of gaseous elemental mercury (GEM) in remote regions is often required, for example in the context of evaluating how effective the Minamata Convention is in reducing global Hg emissions. However, sampling over extended periods of time at sites that are difficult to access can be very challenging. In order to establish what role inexpensive and easy-to-use passive air samplers may play in this regard, we deployed a sampler using a Radiello diffusive barrier and activated carbon sorbent for periods of up to three years and with sampling periods ranging from one to three months in some of the most extreme, remote and challenging global environments: at Concordia station on the Antarctic plateau, on Amsterdam Island in the remote Southern Indian Ocean and at several sites on the tropical island of La Réunion. The ability to reliably record the GEM concentrations at these sites was strongly influenced by the size of the sequestered amount of mercury relative to the extent and variability of the contamination of field blank samples. In some cases, acceptably low and consistent field blank contamination could only be achieved by storing samplers in sealed glass jars during transport and storage. The size of the sequestered amount is easily increased by extending deployment times, and the experience of the current study suggests that deployment periods in excess of two months are advisable. Sampling in Antarctica was compromised by the extreme low temperatures, which caused unknown sampling rates, hoar frost accumulation, material failure and potential failure of storage seals. While good agreement with GEM concentrations measured with an active sampler was noted on Amsterdam Island, the passive sampler derived levels at the Maïdo Observatory in La Réunion were notably higher than concentrations measured simultaneously with a Tekran vapour analyzer, which was possibly related to sampling rates being temporarily elevated at the very beginning of deployment at low GEM concentrations.  
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  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 2634-3606 ISBN Medium  
  Area Expedition Conference  
  Notes Approved yes  
  Call Number Serial 8636  
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Author Emmanuel Le Meur, Olivier Magand, Laurent Arnaud, Michel Fily, Massimo Frezzotti, Marie Cavitte, Robert Mulvaney, Stefano Urbini file  doi
isbn  openurl
  Title Spatial and temporal distributions of surface mass balance between Concordia and Vostok stations, Antarctica, from combined radar and ice core data: first results and detailed error analysis Type Journal
  Year 2018 Publication The Cryosphere Abbreviated Journal  
  Volume 12 Issue 5 Pages 1831-1850  
  Keywords  
  Abstract

Abstract. Results from ground-penetrating radar (GPR) measurements and shallow ice cores carried out during a scientific traverse between Dome Concordia (DC) and Vostok stations are presented in order to infer both spatial and temporal characteristics of snow accumulation over the East Antarctic Plateau. Spatially continuous accumulation rates along the traverse are computed from the identification of three equally spaced radar reflections spanning about the last

 
  Programme (up) 1028,1053,1110  
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  Corporate Author Thesis Bachelor's thesis  
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  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 1994-0416 ISBN 1994-0416 Medium  
  Area Expedition Conference  
  Notes Approved yes  
  Call Number Serial 7358  
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Author Amaelle Landais, Mathieu Casado, Frédéric Prié, Olivier Magand, Laurent Arnaud, Alexey Ekaykin, Jean-Robert Petit, Ghislain Picard, Michel Fily, Bénédicte Minster, Alexandra Touzeau, Sentia Goursaud, Valérie Masson-Delmotte, Jean Jouzel, Anaïs Orsi file  doi
isbn  openurl
  Title Surface studies of water isotopes in Antarctica for quantitative interpretation of deep ice core data Type Journal
  Year 2017 Publication Comptes Rendus Geoscience Abbreviated Journal  
  Volume 349 Issue 4 Pages 139-150  
  Keywords Antarctica Ice core Water isotopes  
  Abstract Polar ice cores are unique climate archives. Indeed, most of them have a continuous stratigraphy and present high temporal resolution of many climate variables in a single archive. While water isotopic records (δD or δ18O) in ice cores are often taken as references for past atmospheric temperature variations, their relationship to temperature is associated with a large uncertainty. Several reasons are invoked to explain the limitation of such an approach; in particular, post-deposition effects are important in East Antarctica because of the low accumulation rates. The strong influence of post-deposition processes highlights the need for surface polar research programs in addition to deep drilling programs. We present here new results on water isotopes from several recent surface programs, mostly over East Antarctica. Together with previously published data, the new data presented in this study have several implications for the climatic reconstructions based on ice core isotopic data: (1) The spatial relationship between surface mean temperature and mean snow isotopic composition over the first meters in depth can be explained quite straightforwardly using simple isotopic models tuned to d-excess vs. δ18O evolution in transects on the East Antarctic sector. The observed spatial slopes are significantly higher (∼ 0.7–0.8‰·°C−1 for δ18O vs. temperature) than seasonal slopes inferred from precipitation data at Vostok and Dome C (0.35 to 0.46‰·°C−1). We explain these differences by changes in condensation versus surface temperature between summer and winter in the central East Antarctic plateau, where the inversion layer vanishes in summer. (2) Post-deposition effects linked to exchanges between the snow surface and the atmospheric water vapor lead to an evolution of δ18O in the surface snow, even in the absence of any precipitation event. This evolution preserves the positive correlation between the δ18O of snow and surface temperature, but is associated with a much slower δ18O-vs-temperature slope than the slope observed in the seasonal precipitation. (3) Post-deposition effects clearly limit the archiving of high-resolution (seasonal) climatic variability in the polar snow, but we suggest that sites with an accumulation rate of the order of 40kg.m−2.yr−1 may record a seasonal cycle at shallow depths.  
  Programme (up) 1028,1110  
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  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 1631-0713 ISBN 1631-0713 Medium  
  Area Expedition Conference  
  Notes Approved yes  
  Call Number Serial 6773  
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Author Albane Barbero, Camille Blouzon, Joël Savarino, Nicolas Caillon, Aurélien Dommergue, Roberto Grilli file  doi
openurl 
  Title A compact incoherent broadband cavity-enhanced absorption spectrometer for trace detection of nitrogen oxides, iodine oxide and glyoxal at levels below parts per billion for field applications Type Journal
  Year 2020 Publication Atmospheric Measurement Techniques Abbreviated Journal  
  Volume 13 Issue 8 Pages 4317-4331  
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  Programme (up) 1028,1177  
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  Corporate Author Thesis Bachelor's thesis  
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  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 1867-1381 ISBN Medium  
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  Notes Approved yes  
  Call Number Serial 7854  
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Author Post Eric, Forchhammer Mads C, Bret-Harte M Syndonia, Callaghan Terry V, Christensen Torben R, Elberling Bo, Fox Anthony D, Gilg Olivier, Hik David S, Høye Toke T, Ims Rolf A, Jeppesen Erik, Klein David R, Madsen Jesper, McGuire A David, Rysgaard Søren, Schindler Daniel E, Stirling Ian, Tamstorf Mikkel P, Tyler Nicholas JC, van der Wal Rene, Welker Jeffrey, Wookey Philip A, Schmidt Niels Martin, Aastrup Peter, doi  openurl
  Title Ecological Dynamics Across the Arctic Associated with Recent Climate Change Type Journal Article
  Year 2009 Publication Science Abbreviated Journal Science  
  Volume 325 Issue 5946 Pages 1355 -1358  
  Keywords  
  Abstract At the close of the Fourth International Polar Year, we take stock of the ecological consequences of recent climate change in the Arctic, focusing on effects at population, community, and ecosystem scales. Despite the buffering effect of landscape heterogeneity, Arctic ecosystems and the trophic relationships that structure them have been severely perturbed. These rapid changes may be a bellwether of changes to come at lower latitudes and have the potential to affect ecosystem services related to natural resources, food production, climate regulation, and cultural integrity. We highlight areas of ecological research that deserve priority as the Arctic continues to warm.
 
  Programme (up) 1036  
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  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0036-8075 ISBN Medium  
  Area Expedition Conference  
  Notes Approved yes  
  Call Number Serial 2839  
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Author Wang Hao, Nagy John D, Gilg Olivier, Kuang Yang, doi  openurl
  Title The roles of predator maturation delay and functional response in determining the periodicity of predatorprey cycles Type Journal Article
  Year 2009 Publication Mathematical Biosciences Abbreviated Journal  
  Volume 221 Issue 1 Pages 1-10  
  Keywords Population cycle, Snowshoe harelynx, Lemmingstoat, Moosewolf, Predatorprey, Delay differential equation,  
  Abstract Population cycles in small mammals have attracted the attention of several generations of theoretical and experimental biologists and continue to generate controversy. Top-down and bottom-up trophic regulations are two recent competing hypotheses. The principal purpose of this paper is to explore the relative contributions of a variety of ecological factors to predatorprey population cycles. Here we suggest that for some species collared lemmings, snowshoe hares and moose in particular maturation delay of predators and the functional response of predation appear to be the primary determinants. Our study suggests that maturation delay alone almost completely determines the cycle period, whereas the functional response greatly affects its amplitude and even its existence. These results are obtained from sensitivity analysis of all parameters in a mathematical model of the lemmingstoat delayed system, which is an extension of Gilgs model. Our result may also explain why lemmings have a 4-year cycle whereas snowshoe hares have a 10-year cycle. Our parameterized model supports and extends Mays assertion that time delay impacts cycle period and amplitude. Furthermore, if maturation periods of predators are too short or too long, or the functional response resembles Holling Type I, then population cycles do not appear; however, suitable intermediate predator maturation periods and suitable functional responses can generate population cycles for both prey and predators. These results seem to explain why some populations are cyclic whereas others are not. Finally, we find parameterizations of our model that generate a 38-year population cycle consistent with the putative cycles of the moosewolf interactions on Isle Royale, Michigan.  
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  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0025-5564 ISBN Medium  
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  Notes Approved yes  
  Call Number Serial 2840  
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Author Gilg Olivier, Sittler Benoît, Hanski Ilkka pdf  doi
openurl 
  Title Climate change and cyclic predatorprey population dynamics in the high Arctic Type Journal Article
  Year 2009 Publication Global Change Biology Abbreviated Journal Glob Chang Biol  
  Volume 15 Issue 11 Pages 2634-2652  
  Keywords Alopex lagopus, Arctic community, climate change, cyclic dynamics, Dicrostonyx groenlandicus, Greenland, Mustela erminea, Nyctea scandiaca, predatorprey interaction, Stercorarius longicaudus,  
  Abstract The high Arctic has the world's simplest terrestrial vertebrate predatorprey community, with the collared lemming being the single main prey of four predators, the snowy owl, the Arctic fox, the long-tailed skua, and the stoat. Using a 20-year-long time series of population densities for the five species and a dynamic model that has been previously parameterized for northeast Greenland, we analyzed the population and community level consequences of the ongoing and predicted climate change. Species' responses to climate change are complex, because in addition to the direct effects of climate change, which vary depending on species' life histories, species are also affected indirectly due to, e.g., predatorprey interactions. The lemmingpredator community exemplifies these complications, yet a robust conclusion emerges from our modeling: in practically all likely scenarios of how climate change may influence the demography of the species, climate change increases the length of the lemming population cycle and decreases the maximum population densities. The latter change in particular is detrimental to the populations of the predators, which are adapted to make use of the years of the greatest prey abundance. Therefore, climate change will indirectly reduce the predators' reproductive success and population densities, and may ultimately lead to local extinction of some of the predator species. Based on these results, we conclude that the recent anomalous observations about lack of cyclic lemming dynamics in eastern Greenland may well be the first signs of a severe impact of climate change on the lemmingpredator communities in Greenland and elsewhere in the high Arctic.
 
  Programme (up) 1036  
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  Corporate Author Thesis Bachelor's thesis  
  Publisher Blackwell Publishing Ltd Place of Publication Editor  
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  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 1365-2486 ISBN Medium  
  Area Expedition Conference  
  Notes Approved yes  
  Call Number Serial 2841  
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Author Gilg, O., B. Sittler, And I. Hanski. doi  openurl
  Title Will Collared Lemmings and their predators be the first vertebrates to “fall over the cliff” in Greenland due to global climate changes? in R. T. Watson, G. Hunt, T. J. Cade, M. Fuller, and E. Potapov (Eds.). Gyrfalcons and ptarmigan in a changing world. The Peregrine Fund, Boise, Idaho, USA. Type Book Chapter
  Year 2011 Publication Abbreviated Journal  
  Volume Issue Pages  
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  Abstract The high-Arctic has the world’s simplest terrestrial vertebrate predator-prey community, with the collared lemming (Dicrostonyx groenlandicus) being the single main prey of four predators, the Snowy Owl (Bubo scandiacus), Arctic fox (Vulpes lagopus), Long-tailed Skua (Stercorarius longicaudus), and stoat (Mustela erminea). Using a 20-year time series and a model that has been previously parameterized with data from northeast Greenland, we analysed the population and community level consequences of the ongoing and predicted climate change. Species’ responses are complex, because in addition to the direct effects of climate change, which vary depending on species’ life histories, species are affected indirectly through interactions with their prey and predator species. The lemming-predator community exemplifies these complications, yet a robust conclusion emerges: in practically all scenarios and for the ranges of parameter values examined, climate change increases the length of the lemming population cycle and decreases the maximum densities reached during the fluctuations. The latter change, in particular, is detrimental to populations of their predators, which are adapted to make use of the years of prey abundance. Indeed, in northeast Greenland, even the Gyrfalcon is strongly dependent on lemmings, for the densities of larger prey as Arctic hare and ptarmigan are too low in most years.
Therefore, climate change will indirectly induce a decline in predators’ reproductive success and population densities, and may ultimately lead to local extinctions of some of the predator species. Based on these results, we conclude that the recent anomalous observations of lemming population dynamics may well be the first signs of a severe impact of climate change on the lemming-predator communities in northeast Greenland and presumably also elsewhere in the high-Arctic
 
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  ISSN ISBN Medium  
  Area Expedition Conference  
  Notes Approved yes  
  Call Number Serial 3342  
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