Search Results - "Christensen, Torben R"

Arctic science: resuming action without Russia by Pisek, Jan, Sonnentag, Oliver, Christensen, Torben R.

“…Letter to the Editor…”
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Increased nitrous oxide emissions from Arctic peatlands after permafrost thaw by Voigt, Carolina, Marushchak, Maija E., Lamprecht, Richard E., Jackowicz-Korczyński, Marcin, Lindgren, Amelie, Mastepanov, Mikhail, Granlund, Lars, Christensen, Torben R., Tahvanainen, Teemu, Martikainen, Pertti J., Biasi, Christina

“…Permafrost in the Arctic is thawing, exposing large carbon and nitrogen stocks for decomposition. Gaseous carbon release from Arctic soils due to permafrost…”
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Microbial Community Changes in 26,500-Year-Old Thawing Permafrost by Scheel, Maria, Zervas, Athanasios, Jacobsen, Carsten S, Christensen, Torben R

“…Northern permafrost soils store more than half of the global soil carbon. Frozen for at least two consecutive years, but often for millennia, permafrost…”
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Ecosystem carbon response of an Arctic peatland to simulated permafrost thaw by Voigt, Carolina, Marushchak, Maija E., Mastepanov, Mikhail, Lamprecht, Richard E., Christensen, Torben R., Dorodnikov, Maxim, Jackowicz‐Korczyński, Marcin, Lindgren, Amelie, Lohila, Annalea, Nykänen, Hannu, Oinonen, Markku, Oksanen, Timo, Palonen, Vesa, Treat, Claire C., Martikainen, Pertti J., Biasi, Christina

“…Permafrost peatlands are biogeochemical hot spots in the Arctic as they store vast amounts of carbon. Permafrost thaw could release part of these long‐term…”
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Sensitivity of the carbon cycle in the Arctic to climate change by McGuire, A. David, Anderson, Leif G, Christensen, Torben R, Dallimore, Scott, Guo, Laodong, Hayes, Daniel J, Heimann, Martin, Lorenson, Thomas D, Macdonald, Robie W, Roulet, Nigel

“…The recent warming in the Arctic is affecting a broad spectrum of physical, ecological, and human/cultural systems that may be irreversible on century time…”
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Multi-year data-model evaluation reveals the importance of nutrient availability over climate in arctic ecosystem C dynamics by López-Blanco, Efrén, Jackowicz-Korczynski, Marcin, Mastepanov, Mikhail, Skov, Kirstine, Westergaard-Nielsen, Andreas, Williams, Mathew, Christensen, Torben R

“…Arctic tundra is a globally important store for carbon (C). However, there is a lack of reference sites characterising C exchange dynamics across annual…”
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Variability in exchange of CO₂ across 12 northern peatland and tundra sites by LUND, MAGNUS, LAFLEUR, PETER M, ROULET, NIGEL T, LINDROTH, ANDERS, CHRISTENSEN, TORBEN R, AURELA, MIKA, CHOJNICKI, BOGDAN H, FLANAGAN, LAWRENCE B, HUMPHREYS, ELYN R, LAURILA, TUOMAS, OECHEL, WALTER C, OLEJNIK, JANUSZ, RINNE, JANNE, SCHUBERT, PER, NILSSON, MATS B

“…Many wetland ecosystems such as peatlands and wet tundra hold large amounts of organic carbon (C) in their soils, and are thus important in the terrestrial C…”
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Rapid responses of permafrost and vegetation to experimentally increased snow cover in sub-arctic Sweden by Johansson, Margareta, Callaghan, Terry V, Bosiö, Julia, kerman, H Jonas, Jackowicz-Korczynski, Marcin, Christensen, Torben R

“…Increased snow depth already observed, and that predicted for the future are of critical importance to many geophysical and biological processes as well as…”
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Large herbivore grazing affects the vegetation structure and greenhouse gas balance in a high arctic mire by Falk, Julie Maria, Schmidt, Niels Martin, Christensen, Torben R, Ström, Lena

“…Herbivory is an important part of most ecosystems and affects the ecosystems' carbon balance both directly and indirectly. Little is known about herbivory and…”
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Focus on the impact of climate change on wetland ecosystems and carbon dynamics by Meng, Lei, Roulet, Nigel, Zhuang, Qianlai, Christensen, Torben R, Frolking, Steve

“…The renewed growth in atmospheric methane (CH4) since 2007 after a decade of stabilization has drawn much attention to its causes and future trends. Wetlands…”
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Ecosystem change and stability over multiple decades in the Swedish subarctic: complex processes and multiple drivers by Callaghan, Terry V, Jonasson, Christer, Thierfelder, Tomas, Yang, Zhenlin, Hedenås, Henrik, Johansson, Margareta, Molau, Ulf, Van Bogaert, Rik, Michelsen, Anders, Olofsson, Johan, Gwynn-Jones, Dylan, Bokhorst, Stef, Phoenix, Gareth, Bjerke, Jarle W., Tømmervik, Hans, Christensen, Torben R., Hanna, Edward, Koller, Eva K., Sloan, Victoria L.

“…The subarctic environment of northernmost Sweden has changed over the past century, particularly elements of climate and cryosphere. This paper presents a…”
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Rapid shift in greenhouse forcing of emerging arctic peatlands by Christensen, Torben R., Scheller, Johan, Scheel, Maria, Rudd, Daniel Alexander, Jackowicz-Korczynski, Marcin, Mastepanov, Mikhail, López-Blanco, Efrén

“…In this study, we hypothesised that the actual development stage (i.e., current age of the ecosystem) is a determining factor for the magnitude of methane…”
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Annual cycle of methane emission from a subarctic peatland by Jackowicz-Korczyński, Marcin, Christensen, Torben R., Bäckstrand, Kristina, Crill, Patrick, Friborg, Thomas, Mastepanov, Mikhail, Ström, Lena

“…Although much attention in recent years has been devoted to methane (CH4) emissions from northern wetlands, measurement based data sets providing full annual…”
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The impact of lower sea-ice extent on Arctic greenhouse-gas exchange by Parmentier, Frans-Jan W., Christensen, Torben R., Sørensen, Lise Lotte, Rysgaard, Søren, McGuire, A. David, Miller, Paul A., Walker, Donald A.

“…An increasingly ice-free Arctic Ocean could have significant implications for greenhouse-gas sources and sinks in the Northern high latitudes. In this Review,…”
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Land-atmosphere exchange of methane from soil thawing to soil freezing in a high-Arctic wet tundra ecosystem by Tagesson, Torbern, Mölder, Meelis, Mastepanov, Mikhail, Sigsgaard, Charlotte, Tamstorf, Mikkel P., Lund, Magnus, Falk, Julie M., Lindroth, Anders, Christensen, Torben R., Ström, Lena

“…The land‐atmosphere exchange of methane (CH4) and carbon dioxide (CO2) in a high‐Arctic wet tundra ecosystem (Rylekærene) in Zackenberg, north‐eastern…”
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Calculations of automatic chamber flux measurements of methane and carbon dioxide using short time series of concentrations by Pirk, Norbert, Mastepanov, Mikhail, Parmentier, Frans-Jan W, Lund, Magnus, Crill, Patrick, Christensen, Torben R

“…The closed chamber technique is widely used to measure the exchange of methane (CH4) and carbon dioxide (CO2) from terrestrial ecosystems. There is, however,…”
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Ancient bacteria show evidence of DNA repair by Johnson, Sarah Stewart, Hebsgaard, Martin B, Christensen, Torben R, Mastepanov, Mikhail, Nielsen, Rasmus, Munch, Kasper, Brand, Tina, Gilbert, M. Thomas P, Zuber, Maria T, Bunce, Michael, Rønn, Regin, Gilichinsky, David, Froese, Duane, Willerslev, Eske

“…Recent claims of cultivable ancient bacteria within sealed environments highlight our limited understanding of the mechanisms behind long-term cell survival…”
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Tundra permafrost thaw causes significant shifts in energy partitioning by Stiegler, Christian, Johansson, Margareta, Christensen, Torben R., Mastepanov, Mikhail, Lindroth, Anders

“…Permafrost, a key component of the arctic and global climate system, is highly sensitive to climate change. Observed and ongoing permafrost degradation…”
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Wetland emissions on the rise by Christensen, Torben R.

“…Methane concentrations are rising faster than ever in the atmosphere. Now, a compilation of observations points towards increased methane emissions from Arctic…”
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Evaluation of terrestrial pan-Arctic carbon cycling using a data-assimilation system by López-Blanco, Efrén, Exbrayat, Jean-François, Lund, Magnus, Christensen, Torben R, Tamstorf, Mikkel P, Slevin, Darren, Hugelius, Gustaf, Bloom, Anthony A, Williams, Mathew

“…There is a significant knowledge gap in the current state of the terrestrial carbon (C) budget. Recent studies have highlighted a poor understanding…”
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