Article
Environmental Sciences
Latha Baskaran, Clayton Elder, A. Anthony Bloom, Shuang Ma, David Thompson, Charles E. Miller
Summary: This study investigates the geomorphological controls on methane hotspots in the Mackenzie Delta region in northern Canada, using airborne imaging spectroscopy data. The results indicate that geomorphology plays a strong role in shaping the spatial patterns of methane emissions, with different topography leading to varying hydrological influences. The study also provides quantitative insights into wetland and freshwater methane mapping and modeling.
ENVIRONMENTAL RESEARCH LETTERS
(2022)
Article
Ecology
Ping Li, Shenliang Chen, Congliang Xu, Jun Du, Di Wu
Summary: The study revealed the coexistence of frequent swings and diversions of old channels in the lower reaches of the Yellow River with the multi-phase overlapping of Yellow River sub-delta lobes. The sedimentary bodies of sub-delta lobes were found to have impacts on the sedimentary characteristics of the sub-delta lobes. Three types of sedimentary bodies of the Yellow River Delta were identified, representing different developmental stages.
REGIONAL STUDIES IN MARINE SCIENCE
(2021)
Article
Geosciences, Multidisciplinary
Jasmine S. Berg, Mathilde Lepine, Emile Laymand, Xingguo Han, Hendrik Vogel, Marina A. Morlock, Niroshan Gajendra, Adrian Gilli, Stefano M. Bernasconi, Carsten J. Schubert, Guangyi Su, Mark A. Lever
Summary: This study comprehensively investigates the deep lacustrine biosphere in Lake Cadagno and its impact on sediment geochemistry and vice versa. The findings reveal distinct redox gradients, microbial activities, and organic carbon remineralization processes in the deep sediment layers compared to the water column.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Marine & Freshwater Biology
Annelore Bezzi, Simone Pillon, Chiara Popesso, Giulia Casagrande, Cristina Da Lio, Davide Martinucci, Luigi Tosi, Giorgio Fontolan
Summary: The Po Delta in Italy has undergone severe modifications due to human activities and decreased river input over the past century, resulting in high levels of subsidence and landward barrier rollover. The stabilisation of barrier islands in response to decreased subsidence rates reflects different local behaviours with dominant longshore processes and progradation. This reversal trend, contrary to many other deltas around the world, poses important implications for coastal management and adaptation plans.
ESTUARINE COASTAL AND SHELF SCIENCE
(2021)
Article
Geography, Physical
Jayson Eppler, Bernhard Rabus, Peter Morse
Summary: A novel method is developed for repeat-pass InSAR-based dry-snow SWE estimation, which takes advantage of the sensitivity of dry-snow refraction-induced InSAR phase to topographic variations. This method can robustly estimate absolute SWE change at a high spatial resolution.
Article
Geosciences, Multidisciplinary
Giovanni Vespasiano, Luigi Marini, Francesco Muto, Luis F. Auque, Rosanna De Rosa, Jon Jimenez, Maria J. Gimeno, Luca Pizzino, Alessandra Sciarra, Giuseppe Cianflone, Mara Cipriani, Adriano Guido, Ilaria Fuoco, Donatella Barca, Elissavet Dotsika, Andrea Bloise, Carmine Apollaro
Summary: This study aims to define the geothermal conceptual model of the Spezzano Albanese thermal system in Calabria, Italy. The deep thermal reservoir of Spezzano Albanese is mainly located in the permeable levels of the Messinian evaporite deposits. The thermal waters exhibit a range of temperatures and compositions due to mixing with low-salinity shallow waters.
MARINE AND PETROLEUM GEOLOGY
(2023)
Article
Geology
Charlotte L. Priddy, Stuart M. Clarke
Summary: The study on the Lower Jurassic Kayenta Formation in the southwestern USA reveals similarities to typical dryland terminal fluvial systems but also highlights some atypical characteristics. External factors and internal complexity play a significant role in shaping the downstream relationships of these systems.
Article
Marine & Freshwater Biology
Yu Cheng, Xinqing Zou, Xiangqian Li, Zengyu Zhao, Xiangyun Zhang, Gang Guo, Jingxing Lin
Summary: The study examines the sediment cores from the Huangqiao sand body in the Yangtze River Delta and identifies four depositional systems, with the stratigraphic architecture and origin mainly controlled by Holocene sea-level changes. The Huangqiao sand body, dated between 7.5 and 4 ka, is not an estuarine sand body but a sand body formed in a tide-dominated delta, providing new evidence for interpreting the origin and evolution of the Yangtze River Delta.
ESTUARINE COASTAL AND SHELF SCIENCE
(2021)
Article
Environmental Sciences
Leon Nill, Inge Grunberg, Tobias Ullmann, Matthias Gessner, Julia Boike, Patrick Hostert
Summary: This study successfully estimated the fractional cover of shrubs and other surface components in the Arctic tundra using satellite observations and synthetic training data. The results showed an increase in shrub cover and a decline in herbaceous plant and lichen cover, indicating a replacement and homogenisation of Arctic vegetation communities. The proposed method provides new opportunities for quantitatively estimating the fractional cover of tundra vegetation and advancing our understanding of shrub expansion.
REMOTE SENSING OF ENVIRONMENT
(2022)
Article
Environmental Sciences
Hanyue Xu, Da-Wei Li, Hong-Chun Li, Meixun Zhao, William M. Berelson, Gui'e Jin, Li Li, Satabdi Misra
Summary: The sedimentary nitrogen isotope record in Santa Barbara Basin is affected by both local and remote forcing. There is a long-term decreasing trend in the record, as well as abrupt annual to multiannual changes. The denitrification process in the bottom water, influenced by changes in upwelling intensity and marine productivity, plays a major role in controlling the nitrogen isotope signal. The impact of climatic factors on denitrification in the basin is time dependent.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Geochemistry & Geophysics
Jiwei Li, Ling Li, Shijie Bai, Shun Chen, Hengchao Xu, Kaiwen Ta, Yuangao Qu, Yuguang Wang, Huiqiang Yao, Yanhui Dong, Shamik Dasgupta, Mengran Du, Shuangquan Liu, Fanyu Lin, Xiaotong Peng
Summary: Trench systems play a significant role in the global metal cycle. Ferromanganese nodules in trench environments exhibit rapid growth rates, influenced by volcanic ash alteration and fluids discharge from the trench seabed. The study proposes a model for a geochemical Mn cycle and nodule formation in trench sedimentary environments based on geochemical and microbial data.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2021)
Article
Energy & Fuels
Gang Li, Zi-Chao Zhao, Xiao-Sen Li, Qiu-Nan Lv, Zhao-Yang Chen
Summary: Japan conducted a field test of methane hydrate in the Nankai Trough and successfully simulated the dissociation effect of the hydrate. The simulation results showed that increasing certain control factors can significantly improve gas production, while the dissociated products mainly come from the original gas and aqueous phases in the reservoir.
Article
Environmental Sciences
Zheng Li, Jiaju Liu, Yushun Zhao, Yang Zhang, Qing Hu, Yanxiao Liu, Huaicheng Guo
Summary: The study reveals that there are differences in the isotopic characteristics of the Yarlung Tsangpo River water in both time and space, with the values of δ18O, 6D, and d-excess being significantly higher during low-flow season compared to high-flow season due to weaker evaporation enrichment and precipitation supply effects in the wet season. Additionally, the investigation of the main and branch rivers of the Yarlung Tsangpo River Basin shows that the upper reaches are mainly supplied by snowmelt, while the lower reaches are mainly supplied by rainfall.
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
(2021)
Article
Geosciences, Multidisciplinary
Baofeng Li, Qi Feng, Zaijun Li, Fei Wang, Tengfei Yu, Xiaoyan Guo, Haiyang Xi
Summary: This study reveals the provenance and driving mechanisms of dune sands in the Badain Jaran Desert (BJD) through geochemical analysis. The results show that the dune sands mainly originate from felsic source rocks in the source area, while the fine fraction may have multiple provenances, with limited contribution from Gobi deposits.
Article
Geochemistry & Geophysics
Derek L. L. Schutt, Robert W. W. Porritt, Clement Esteve, Pascal Audet, Jeremy M. M. Gosselin, Andrew J. J. Schaeffer, Richard C. C. Aster, Jeffrey T. T. Freymueller, Joel F. F. Cubley
Summary: The Mackenzie Mountains in Canada are currently uplifting despite being far from the nearest plate boundary. Tomographic inversion reveals a low-velocity structure in the lithosphere that extends upward and is associated with the ongoing uplift and seismicity. Strain transfer from the Gulf of Alaska boundary plays a driving role in the uplift, causing the crust to translate and buckle against the craton. Azimuthal anisotropy in the lithosphere indicates misalignment between asthenosphere flow and lithospheric strain.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2023)
Article
Environmental Sciences
Kirsi H. Keskitalo, Lisa Broder, Dirk Jong, Nikita Zimov, Anna Davydova, Sergei Davydov, Tommaso Tesi, Paul J. Mann, Negar Haghipour, Timothy Eglinton, Jorien E. Vonk
Summary: Major Arctic rivers are undergoing changes due to climate warming, leading to higher discharge and increased amounts of solutes and organic carbon draining into rivers and coastal seas. The degradation of particulate organic carbon (POC) in these rivers is poorly characterized, and this study examines POC degradation in the Kolyma River. The results show that POC composition and biodegradability differ greatly between seasons.
ENVIRONMENTAL RESEARCH LETTERS
(2022)
Article
Environmental Sciences
Britta M. Voss, Timothy Eglinton, Bernhard Peucker-Ehrenbrink, Valier Galy, Susan Q. Lang, Cameron McIntyre, Robert G. M. Spencer, Ekaterina Bulygina, Zhaohui Aleck Wang, Katherine A. Guay
Summary: The sources of carbon in the Fraser River system vary spatially and temporally. Tributaries in the northern interior consistently contribute higher concentrations of dissolved organic carbon (DOC) to the main stem. The radiocarbon age of DOC exported from the Fraser River does not change significantly across seasons, indicating that there is modulation of heterogeneous chemical and isotopic signals during transit through the river basin. Dissolved inorganic carbon (DIC) concentrations are highest in the Rocky Mountain headwater region and in tributaries with high DOC concentrations, suggesting that DOC respiration plays a significant role in DIC in this basin. Overall, the cycling of DOC and DIC is closely linked in the river network, with active processing and transformation of carbon during transport.
Article
Geosciences, Multidisciplinary
L. Broder, C. Hirst, S. Opfergelt, M. Thomas, J. E. Vonk, N. Haghipour, T. I. Eglinton, J. Fouche
Summary: The ongoing shrinkage of Greenland's icecap and thawing of permafrost are releasing ancient organic carbon into the environment. Some of this carbon is associated with minerals and may be transported to marine environments. However, the specific impacts on climate are still uncertain.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Review
Oceanography
Oleg Dudarev, Alexander Charkin, Natalia Shakhova, Aleksey Ruban, Denis Chernykh, Jorien Vonk, Tommaso Tesi, Jannik Martens, Irina Pipko, Svetlana Pugach, Elena Gershelis, Andrey Leusov, Andrey Grinko, Orjan Gustafsson, Igor Semiletov
Summary: This study investigates the interannual variability and spatial distribution of suspended particulate matter (SPM) in the East Siberian Sea. The results show significant differences in SPM distribution and elemental-isotopic characteristics between the western and eastern biogeochemical provinces of the sea. The atmospheric circulation and water transport play a role in determining the displacement of the biogeochemical border between the provinces.
PROGRESS IN OCEANOGRAPHY
(2022)
Article
Oceanography
Emma J. Bullock, Lauren Kipp, Willard Moore, Kristina Brown, Paul J. Mann, Jorien E. Vonk, Nikita Zimov, Matthew A. Charette
Summary: This study quantifies the river radium inputs into the Arctic Ocean for the first time and improves the estimates for this region. Through lab experiments and data from major rivers around the world, it is found that rivers are an important source of radium to the Arctic Ocean. Understanding river radium inputs is crucial for studying changes in biogeochemically important element fluxes as climate change and Arctic warming continue.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2022)
Article
Environmental Sciences
Atsushi Matsuoka, Marcel Babin, Jorien E. Vonk
Summary: This study shows that tracking total OC in the Mackenzie Delta is now possible using satellite observations. The findings suggest that there is a significant increase in dissolved OC and particulate OC concentrations in late summer, which can likely be attributed to increasing inputs of permafrost OC. This study demonstrates the potential of remote sensing for detecting catchment-scale thaw impacts.
REMOTE SENSING OF ENVIRONMENT
(2022)
Article
Soil Science
Maxime Thomas, Arthur Monhonval, Catherine Hirst, Lisa Broder, Scott Zolkos, Jorien E. Vonk, Suzanne E. Tank, Kirsi H. Keskitalo, Sarah Shakil, Steven Kokelj, Jurjen van der Sluijs, Sophie Opfergelt
Summary: In northern high latitudes, rapid warming can enhance permafrost thaw and the transformation of soil organic carbon. However, a significant portion of permafrost soil organic carbon is stabilized by interactions with the soil mineral pool. Understanding mineral-organic carbon interactions is crucial for constraining permafrost-carbon-climate feedbacks.
Editorial Material
Multidisciplinary Sciences
J. E. Vonk, N. J. Speetjens, A. E. Poste
Summary: Despite the fact that over 99% of coastal arctic rivers drain small catchments, future projections of land-ocean fluxes are derived from data of large rivers. We advocate for the inclusion and increased focus on smaller catchments to facilitate representative assessments of arctic ecosystem change.
NATURE COMMUNICATIONS
(2023)
Article
Environmental Sciences
Ove H. Meisel, Ruud Rijkers, Joshua F. Dean, Michiel H. In 't Zandt, Jacobus van Huissteden, Trofim C. Maximov, Sergey V. Karsanaev, Luca Belelli Marchesini, Arne Goovaerts, Lukas Wacker, Gert-Jan Reichart, Steven Bouillon, Cornelia U. Welte, Mike S. M. Jetten, Jorien E. Vonk, Han Dolman
Summary: Thermokarst lakes, classified as either floating-ice or bedfast-ice lakes, play important roles in organic carbon sequestration, soil organic matter decomposition, and greenhouse gas release in the Arctic. The differences in winter ice regime and eroding shorelines are key factors determining the quantity and quality of organic matter in thermokarst lake sediments. This study reveals significant differences in environmental conditions, sediment characteristics, carbon stocks, and microbial community compositions between a bedfast-ice lake and a floating-ice lake in Far East Siberia with different eroding shorelines. The depth of lake water and shoreline erosion are identified as the main drivers of sedimentary, microbial, and biogeochemical diversity in thermokarst lakes. However, further research is needed to fully understand the differences in sediments and the impact of eroding shorelines on these lake systems.
Article
Soil Science
Julia Wagner, Victoria Martin, Niek J. Speetjens, Willeke A'Campo, Luca Durstewitz, Rachele Lodi, Michael Fritz, George Tanski, Jorien E. Vonk, Andreas Richter, Annett Bartsch, Hugues Lantuit, Gustaf Hugelius
Summary: Soil organic carbon (SOC) in arctic coastal tundra is vulnerable to climate change, and its distribution and stability are influenced by factors such as landscape history and ground ice content.
Article
Geosciences, Multidisciplinary
Martine Lizotte, Bennet Juhls, Atsushi Matsuoka, Philippe Massicotte, Gaelle Mevel, David Obie James Anikina, Sofia Antonova, Guislain Becu, Marine Beguin, Simon Belanger, Thomas Bosse-Demers, Lisa Broeder, Flavienne Bruyant, Gwenaelle Chaillou, Jerome Comte, Raoul-Marie Couture, Emmanuel Devred, Gabriele Deslongchamps, Thibaud Dezutter, Miles Dillon, David Doxaran, Aude Flamand, Frank Fell, Joannie Ferland, Marie-Helene Forget, Michael Fritz, Thomas J. Gordon, Caroline Guilmette, Andrea Hilborn, Rachel Hussherr, Charlotte Irish, Fabien Joux, Lauren Kipp, Audrey Laberge-Carignan, Hugues Lantuit, Edouard Leymarie, Antonio Mannino, Juliette Maury, Paul Overduin, Laurent Oziel, Colin Stedmon, Crystal Thomas, Lucas Tisserand, Jean-Eric Tremblay, Jorien Vonk, Dustin Whalen, Marcel Babin
Summary: Climate warming in the Arctic is expected to change the distribution and dynamics of carbon in frozen grounds. Thawing permafrost in the Mackenzie River watershed releases organic matter into the Arctic Ocean, but its fate remains poorly understood. Field expeditions were conducted to study this process in the Mackenzie Delta region and southern Beaufort Sea, with the collaboration of local communities and the measurement of various physical, chemical, and biological variables.
EARTH SYSTEM SCIENCE DATA
(2023)
Article
Geosciences, Multidisciplinary
Niek Jesse Speetjens, Gustaf Hugelius, Thomas Gumbricht, Hugues Lantuit, Wouter R. Berghuijs, Philip A. Pika, Amanda Poste, Jorien E. Vonk
Summary: ARCADE is an integrated database of over 40,000 catchments that drain into the Arctic Ocean, ranging in size from 1 to 3.1 x 106 km2. It includes numerous small catchments experiencing significant climatic warming and storing large amounts of soil carbon. ARCADE is a key tool for monitoring the pan-Arctic across scales.
EARTH SYSTEM SCIENCE DATA
(2023)
Article
Ecology
Dirk Jong, Lisa Broder, Tommaso Tesi, Kirsi H. Keskitalo, Nikita Zimov, Anna Davydova, Philip Pika, Negar Haghipour, Timothy I. Eglinton, Jorien E. Vonk
Summary: Arctic rivers are increasingly affected by thawing permafrost, and the fate of permafrost-derived organic carbon (OC) depends on complex processes along the source-to-sink system. A study on the Kolyma River and East Siberian Sea investigates the composition and degradation state of riverine OC compared to marine sediments. The results suggest that old permafrost-OC is mainly associated with sediments, while autochthonous primary production contributes to particulate OC.
Article
Ecology
Niek Jesse Speetjens, George Tanski, Victoria Martin, Julia Wagner, Andreas Richter, Gustaf Hugelius, Chris Boucher, Rachele Lodi, Christian Knoblauch, Boris P. Koch, Urban Wunsch, Hugues Lantuit, Jorien E. Vonk
Summary: Climate warming in the western Canadian Arctic is causing the thawing of permafrost soils and the release of organic matter, which enters aquatic systems and impacts ecosystems and greenhouse gas emissions. However, research on these processes in small, high-Arctic watersheds is limited.
Article
Ecology
Sarah Shakil, Suzanne E. Tank, Jorien E. Vonk, Scott Zolkos
Summary: Warming and wetting in the western Canadian Arctic are accelerating thaw-driven mass wasting by permafrost thaw slumps, resulting in a significant increase in organic carbon delivery to headwater streams. This study found that the organic carbon from these slumps is mostly deposited in sediments, while dissolved organic carbon is mineralized to CO2. The mineral-rich tills in this region can protect carbon and enhance inorganic carbon sequestration.