Article
Microbiology
Soohyun Kim, Kwanwoo Kim, Naeun Jo, Hyo-Keun Jang, So-Hyun Ahn, Janghan Lee, Howon Lee, Sanghoon Park, Dabin Lee, Dean A. Stockwell, Terry E. Whitledge, Sang-Heon Lee
Summary: The understanding of primary production of phytoplankton in the Kara Sea, Laptev Sea, and East Siberian Sea is limited. In order to address this knowledge gap, three NABOS expeditions were conducted, measuring in situ primary production rates and examining their controlling factors. The study found significant spatial and regional differences in primary production rates, with the East Siberian Sea having a lower rate compared to the Kara Sea and Laptev Sea, likely due to regional differences in freshwater content.
Article
Geosciences, Multidisciplinary
B. Bukhanov, E. Chuvilin, M. Zhmaev, N. Shakhova, E. Spivak, O. Dudarev, A. Osadchiev, M. Spasennykh, I. Semiletov
Summary: Understanding the features of sediment temperature and physical properties in the shelf and continental slope areas of the Russian Arctic seas is crucial for assessing the current condition of subsea permafrost and gas hydrates stability zone.
MARINE AND PETROLEUM GEOLOGY
(2023)
Article
Environmental Sciences
Valentina Sattarova, Kirill Aksentov, Anatolii Astakhov, Xuefa Shi, Limin Hu, Alexandr Alatortsev, Anna Mariash, Elena Yaroshchuk
Summary: The analysis of trace metals in sediments of the Laptev and East Siberian Seas showed high concentrations of Cr, Zn, Ni, Cu, As, and Cd, with the increased Cd concentration possibly stemming from the highly productive waters of the Bering Sea. Contamination indices revealed no contamination by Cr, Ni, Cu, Zn, Pb, and Cd at any sampling locations, but slight As enrichment was observed.
MARINE POLLUTION BULLETIN
(2021)
Article
Environmental Sciences
Xiaole Sun, Christoph Humborg, Carl-Magnus Morth, Volker Bruchert
Summary: This study evaluates the benthic nutrient regeneration in the outer Laptev and East Siberian shelf, highlighting significant benthic nitrogen loss relative to DIP and DSi. The estimation of benthic fluxes might be underestimated, and the proportion of nutrients derived from sediments is expected to increase with increasing primary production in the future warmer Arctic continental shelf.
GLOBAL BIOGEOCHEMICAL CYCLES
(2021)
Article
Environmental Sciences
Alexander Osadchiev, Dmitry Frey, Eduard Spivak, Sergey Shchuka, Natalia Tilinina, Igor Semiletov
Summary: This study focuses on the freshened surface layer (FSL) in the Laptev and East-Siberian seas, showing that the morphology of deltaic rivers and estuaries significantly impact the distribution of freshwater and the extent of the FSL. Wind conditions play a crucial role in determining the spreading and inter-annual variability of the FSL.
FRONTIERS IN MARINE SCIENCE
(2021)
Article
Environmental Sciences
Anastasia N. Drozdova, Ivan N. Krylov, Andrey A. Nedospasov, Elena G. Arashkevich, Timur A. Labutin
Summary: The East Siberian Sea is an area with high biogeochemical activity, characterized by unique dissolved organic carbon behavior and spectral distribution. Compared to the Laptev Sea, the shelf waters of the East Siberian Sea contain higher levels of protein-like and marine humic-like fluorescent substances.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Ecology
Jens A. Hoelemann, Bennet Juhls, Dorothea Bauch, Markus Janout, Boris P. Koch, Birgit Heim
Summary: Permafrost degradation in major Siberian river catchments, combined with higher precipitation in a warming climate, could increase the flux of terrestrially derived dissolved organic matter into the Arctic Ocean. A study reveals that conservative mixing of high-tDOM river water and sea-ice meltwater with low-tDOM seawater is the major factor controlling the surface distribution of tDOM in the Laptev Sea and East Siberian Sea.
Article
Environmental Sciences
Imali Kaushalya Herath, Shengjun Wu, Maohua Ma, Huang Ping
Summary: This study estimated riverine pCO(2) in the Yangtze River system and measured various carbon variables and isotopes. The results showed seasonal and spatial fluctuations in pCO(2), which were influenced by organic carbon and DIC. This study provides important insights into the carbon cycling in river systems and the global carbon budget.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Geosciences, Multidisciplinary
Vasily Bogoyavlensky, Aleksei Kishankov, Aleksei Kazanin
Summary: This study used data from seismic reflections to investigate the potential distribution and absence of frozen ground and gas hydrates on the East Siberian Arctic Shelf. The study revealed a significant decrease in the area of frozen ground and methane hydrate existence after the postglacial period. Analysis of subsea frozen ground degradation zones suggested a low probability of substantial methane contribution to climate change from dissociating gas hydrates.
MARINE AND PETROLEUM GEOLOGY
(2023)
Article
Oceanography
Hongjie Liang, Jie Su
Summary: The onset of ice/snow melt is critical for the ice-albedo positive feedback in the Arctic region. The timing of melt onset has shown a significant shift between the Laptev Sea and the East Siberian Sea from 1979 to 2018, with a phenomenon referred to as the Melt Onset Seesaw becoming more pronounced since 1999. The melt onset in each of these regions is influenced by a combination of local variables and large-scale atmospheric circulation patterns.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2021)
Article
Oceanography
Valentina Sattarova, Anatolii Astakhov, Kirill Aksentov, Xuefa Shi, Limin Hu, Yanguang Liu, Dmitry Polyakov, Alexandr Alatortsev, Olga Kolesnik
Summary: Deciphering the origin of sedimentary material in the Arctic is important for understanding transport and sedimentation processes. Rare earth elements (REEs) can serve as indicators of sources, conditions, and processes. This study examined the distribution of REE sources in sediments from the East Siberian Arctic Shelf and found that the REEs came from the eroded Yedoma complex along the coast. The findings have implications for studying ice dynamics and for reconstructing the Central Arctic's lithostratigraphy and paleoceanography.
CONTINENTAL SHELF RESEARCH
(2023)
Review
Oceanography
So -Young Kim, Taewook Park, Fabienne Marret, Eric Potvin, Kyoung-Ho Cho, Jinyoung Jung, Youngju Lee, Hyoung Sul La, Sun -Yong Ha, Seung-Kyu Kim, Sung -Ho Kang, Eun Jin Yang, Seung-Il Nam, Jong Kuk Hong
Summary: The Pacific sector of the Arctic Ocean, a region with the fastest sea-ice loss, is experiencing unprecedented biological regime shifts in its marine ecosystems today. This study provides the first detailed description of recent dinoflagellate cyst assemblages in the region, revealing strong regionalization in species composition and distribution, as well as the environmental factors driving these patterns.
PROGRESS IN OCEANOGRAPHY
(2023)
Article
Geosciences, Multidisciplinary
Evgeny Chuvilin, Boris Bukhanov, Sergey Grebenkin, Vladimir Tumskoy, Natalia Shakhova, Oleg Dudarev, Igor Semiletov, Mikhail Spasennykh
Summary: The temperature and thermal properties of shelf sediments from the East Siberian, Laptev, and Kara Seas were determined, revealing the widespread presence of subsea permafrost. The thermal conductivity of unfrozen cryotic sediments was predominantly influenced by the contents of silt and clay. Frozen sediments exhibited higher thermal conductivities, with salinity, ice content, and unfrozen water also playing roles in thermal conductivity.
MARINE AND PETROLEUM GEOLOGY
(2021)
Article
Biodiversity Conservation
Lidiya Vasilenko, Yuriy Vasilenko, Aleksandr Bosin, Ira Tsoy, Xuefa Shi, Yanguang Liu
Summary: The study presents new data on the taxonomic diversity and content of microplanktonic organisms in Arctic sediments. Radiolarian skeletons were found in the Laptev Sea and Arctic Ocean, while tintinnid ciliate loricae were mainly found in the coastal shelf zone. These findings contribute to knowledge on Arctic biodiversity and can be used to monitor ecological and paleoceanographic changes in the region.
Article
Geochemistry & Geophysics
Dmitry F. Budko, Liudmila L. Demina, Anna Travkina, Dina P. Starodymova, Tatiyana N. Alekseeva
Summary: Over the past few decades, growing scientific interest in contamination problems has emerged due to climate warming and the exploration of Arctic seas' mineral resources. A study was conducted to characterize the distribution of 47 elements in surface bottom sediments from various Arctic seas. The results suggest that the distribution of most elements is related to natural processes, while arsenic may primarily come from anthropogenic sources.
Article
Fisheries
Henrik Svedang, Oleg Savchuk, Anna Villnas, Alf Norkko, Bo G. Gustafsson, Sofia A. Wikstrom, Christoph Humborg, Anna Kuparinen
Summary: Hypoxia is seen as the main factor behind the decline of the Eastern Baltic cod stock, but it is not the direct cause of the decline in EBC productivity. Over the past 60 years, hydrographic conditions in the Bornholm Basin have remained unchanged, while spawning conditions deteriorated in the Gotland Deep due to hypoxia. Additionally, in the past 30 years, well-oxygenated and potentially suitable feeding areas for EBC remain abundant in various parts of the Baltic Sea.
ICES JOURNAL OF MARINE SCIENCE
(2022)
Article
Limnology
Maciej T. Tomczak, Barbel Mueller-Karulis, Thorsten Blenckner, Eva Ehrnsten, Margit Eero, Bo Gustafsson, Alf Norkko, Saskia A. Otto, Karen Timmermann, Christoph Humborg
Summary: This study analyzed the historical changes and ecological regime shifts in the Baltic Sea ecosystem. The research found that the Baltic Sea ecosystem shifted from a benthic to pelagic-dominated state in the long term, with productivity, climate, and hydrography having a significant impact on the food web functioning.
LIMNOLOGY AND OCEANOGRAPHY
(2022)
Article
Astronomy & Astrophysics
D. Carrizo, A. de Dios-Cubillas, L. Sanchez-Garcia, I. Lopez, O. Prieto-Ballesteros
Summary: The aim of future space missions is to find evidence of life beyond Earth on icy moons. This study investigates the presence of molecular and isotopic biomarkers in submarine cold seep systems to gain understanding of potential carbon cycles in the icy worlds' oceans. The analysis of lipid biomarkers and carbon isotopes allows us to infer different carbonate origins and discuss carbon sources and sinks in analogous icy-moon oceans. The isotopic analysis of carbon may be crucial for detecting biosignatures in icy-world carbon sinks.
Article
Multidisciplinary Sciences
Victoria Munoz-Iglesias, Laura Sanchez-Garcia, Daniel Carrizo, Antonio Molina, Maite Fernandez-Sampedro, Olga Prieto-Ballesteros
Summary: In this study, natural samples from three hydrothermal areas in Iceland were analyzed using Raman spectroscopy to assess the relation between spectroscopic signatures and hydrothermal processes and biomediation. The results showed that Raman spectroscopy is suitable for examining areas with water-altered minerals, with silica detection being particularly interesting as it could indicate the past existence of nutrient-rich hydrothermal hot springs and provide a good matrix for preserving biosignatures. These findings can be valuable for future missions to Mars.
SCIENTIFIC REPORTS
(2022)
Article
Microbiology
Diego M. Roldan, Daniel Carrizo, Laura Sanchez-Garcia, Rodolfo Javier Menes
Summary: Global warming has a significant impact on polar regions, particularly on the Antarctic Peninsula and nearby islands. The study reveals that the future methane emissions from this area could increase due to the warming trend. The research focuses on the aerobic methane oxidation potential of freshwater lake sediments in the Fildes Peninsula and identifies the bacterial community and diversity. The findings suggest that aerobic methanotrophs could potentially mitigate methane emissions in this climate-sensitive area.
FRONTIERS IN MICROBIOLOGY
(2022)
Article
Microbiology
Angelica Angles, Qitao He, Laura Sanchez Garcia, Daniel Carrizo, Nuria Rodriguez, Ting Huang, Yan Shen, Ricardo Amils, David C. Fernandez-Remolar
Summary: The speleothems in Chiquini and Galaxias caves are influenced by long fungal structures. The caves were formed during wetter periods and episodes of rising lake levels. Fungal and hydrological activities played important roles in the formation of these caves.
FRONTIERS IN MICROBIOLOGY
(2022)
Article
Microbiology
Valentine Megevand, Daniel Carrizo, Maria angeles Lezcano, Mercedes Moreno-Paz, Nathalie A. Cabrol, Victor Parro, Laura Sanchez-Garcia
Summary: This study investigates microbial biomarkers in a hot spring environment in the Chilean Andes, revealing the microbial community structure and ecology along a thermal gradient. New cyanobacterial species and biomarkers are discovered, showcasing the astrobiological relevance of the site. The research provides valuable insights into understanding ancient hydrothermal deposits and their potential for hosting extraterrestrial life.
FRONTIERS IN MICROBIOLOGY
(2022)
Article
Environmental Sciences
Laura Sanchez-Garcia, Maria Angeles Lezcano, Daniel Carrizo, Rita Severino, Miriam Garcia-Villadangos, Sherry L. Cady, Kim Warren-Rhodes, Nathalie A. Cabrol, Victor Parro
Summary: Subaerial hydrothermal systems are potential environments for the origin of life on Earth and Mars, offering a unique atmosphere-hydrosphere-lithosphere interface. The sinter deposits in these systems are promising targets for searching extraterrestrial life signs. This study investigates the effects of silicification on the preservation of lipid biomarkers using samples from El Tatio. The data reveals the degradation rate of lipid biomarkers and informs the time window for recovering signs of past life.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Chemistry, Analytical
Rita Severino, Mercedes Moreno -Paz, Fernando Puente-Sanchez, Laura Sanchez-Garcia, Valeria A. Risso, Jose M. Sanchez-Ruiz, Nathalie Cabrol, Victor Parro
Summary: In this study, mass spectrometry and spectroscopic techniques were used to search for molecular biomarkers on Mars. One major challenge is detecting and identifying large and complex compounds. The researchers proposed an immunoanalytical method to identify ancient and universally conserved protein/peptide sequences as targets for identifying ancestral biomarkers in nature. They successfully detected positive immunoreactions with antibodies to ancient proteins using fluorescent sandwich microarray immunoassays and confirmed the results through metagenomic sequencing.
ANALYTICAL CHEMISTRY
(2023)
Review
Astronomy & Astrophysics
Pablo L. Finkel, Daniel Carrizo, Victor Parro, Laura Sanchez-Garcia
Summary: Lipids, as organic compounds forming cell membranes, are widely present in terrestrial environments and considered useful biomarkers for life detection on Earth. They have membrane-forming properties under hostile conditions, making them potential biomarkers for life beyond Earth. Unlike nucleic acids or proteins, lipids can retain diagnostic information about their biological source for millions of years, which is crucial in the study of astrobiology. This work explores the potential of lipid biomarkers, along with stable carbon isotope analysis, as a powerful tool for investigating the existence of life on Mars.
Article
Multidisciplinary Sciences
Armando Azua-Bustos, Alberto G. Fairen, Carlos Gonzalez-Silva, Olga Prieto-Ballesteros, Daniel Carrizo, Laura Sanchez-Garcia, Victor Parro, Miguel Angel Fernandez-Martinez, Cristina Escudero, Victoria Munoz-Iglesias, Maite Fernandez-Sampedro, Antonio Molina, Miriam Garcia Villadangos, Mercedes Moreno-Paz, Jacek Wierzchos, Carmen Ascaso, Teresa Fornaro, John Robert Brucato, Giovanni Poggiali, Jose Antonio Manrique, Marco Veneranda, Guillermo Lopez-Reyes, Aurelio Sanz-Arranz, Fernando Rull, Ann M. Ollila, Roger C. Wiens, Adriana Reyes-Newell, Samuel M. Clegg, Maeva Millan, Sarah Stewart Johnson, Ophelie McIntosh, Cyril Szopa, Caroline Freissinet, Yasuhito Sekine, Keisuke Fukushi, Koki Morida, Kosuke Inoue, Hiroshi Sakuma, Elizabeth Rampe
Summary: By studying Red Stone samples formed in the Atacama Desert, scientists have discovered a unique group of microorganisms called "dark microbiome" and identified biosignatures associated with extant and ancient microorganisms. Comparing with minerals on Mars, they found that the organics on the red planet are extremely low and may be difficult to detect with current instruments. Therefore, bringing samples back to Earth for further analysis is crucial in determining the existence of life on Mars.
NATURE COMMUNICATIONS
(2023)
Article
Multidisciplinary Sciences
Alberto G. Fairen, Nuria Rodriguez, Laura Sanchez-Garcia, Patricia Rojas, Esther R. Uceda, Daniel Carrizo, Ricardo Amils, Jose L. Sanz
Summary: Tirez, a small lagoon in central Spain, has dried out completely, allowing for the study of its desiccation process as an analog to similar events on early Mars. This research examines the microbial ecology of Tirez when it was active 20 years ago, the composition of the microbial community in the dried lake sediments today, and the analysis of lipid biomarkers recovered from the sediments. The findings have implications for understanding Martian microbial communities during the wet-to-dry transition and can inform research strategies to search for possible biomarkers on Mars.
SCIENTIFIC REPORTS
(2023)
Article
Geosciences, Multidisciplinary
J. Muchowski, L. Arneborg, L. Umlauf, P. Holtermann, E. Eisbrenner, C. Humborg, M. Jakobsson, C. Stranne
Summary: Diapycnal mixing affects the vertical transport rates of salt, heat, and other dissolved substances, which are crucial for the overturning circulation and ecosystem functioning in marine systems. This study investigates the overall impact of non-tidal flow over multiple small-scale bathymetric features on a strongly-stratified density interface in a coastal region. The findings highlight the importance of rough small-scale bathymetric features for the vertical transport of salt in coastal areas.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Microbiology
Daniel Carrizo, Federico A. Vignale, Laura Sanchez-Garcia, Maria E. Farias
Summary: This study investigated the microbial ecology of three high-altitude hypersaline ponds in the Andean wetlands. The analysis of lipid sedimentary records revealed differences in microbial community structure and carbon metabolisms among ponds with different salinity levels, providing a basis for further biogeochemical studies in the area.
FEMS MICROBIOLOGY ECOLOGY
(2022)
Review
Geosciences, Multidisciplinary
Karol Kulinski, Gregor Rehder, Eero Asmala, Alena Bartosova, Jacob Carstensen, Bo Gustafsson, Per O. J. Hall, Christoph Humborg, Tom Jilbert, Klaus Juergens, H. E. Markus Meier, Barbel Muller-Karulis, Michael Naumann, Jorgen E. Olesen, Oleg Savchuk, Andreas Schramm, Caroline P. Slomp, Mikhail Sofiev, Anna Sobek, Beata Szymczycha, Emma Undeman
Summary: This paper reviews the biogeochemical functioning of the Baltic Sea and its impact on the ecological status. The Baltic Sea has undergone significant changes in recent decades, and the reduction in nutrient loads has not yet resulted in improved oxygen availability due to the low burial efficiency of phosphorus. The assessment also highlights the knowledge gaps and future research needs in marine biogeochemistry in the Baltic Sea.
EARTH SYSTEM DYNAMICS
(2022)
Article
Geochemistry & Geophysics
Xinze Lu, Geoffrey J. Gilleaudeau, Brian Kendall
Summary: The Late Ordovician mass extinction is the first major extinction event in the Phanerozoic, but the reasons for the decline in global biodiversity before the extinction are not well understood.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2024)
Article
Geochemistry & Geophysics
Junyao Kang, Daniel D. Gregory, Benjamin Gill, Shiqiang Huang, Changxin Lai, Zhaoshan Chang, Huan Cui, Ivan Belousov, Shuhai Xiao
Summary: Sedimentary pyrite is an important geological archive, but it can be altered by diagenetic and hydrothermal processes. This study successfully trained machine learning algorithms to distinguish pyrite origins using trace element data. The approach was validated and applied to identify the origins of pyrite in two sedimentary successions in South China.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2024)