A5022096065- Methane Hydrates and Related Phenomena
- Geology and Paleoclimatology Research
- Climate change and permafrost
- Geological Studies and Exploration
- Marine and coastal ecosystems
- Atmospheric and Environmental Gas Dynamics
- Arctic and Antarctic ice dynamics
- Cryospheric studies and observations
- Marine and environmental studies
- Hydrocarbon exploration and reservoir analysis
- Isotope Analysis in Ecology
- Geological formations and processes
- Marine Biology and Ecology Research
- Polar Research and Ecology
- Coastal wetland ecosystem dynamics
- Microbial Community Ecology and Physiology
- Arctic and Russian Policy Studies
- Maritime and Coastal Archaeology
- Coastal and Marine Dynamics
- Geological and Geophysical Studies Worldwide
- Groundwater and Isotope Geochemistry
- Enzyme Structure and Function
- Oceanographic and Atmospheric Processes
- Paleontology and Stratigraphy of Fossils
- Geochemistry and Elemental Analysis
National Research Council
2016-2025
Polar (Finland)
2023-2025
National Research Council
2025
Institute of Atmospheric Sciences and Climate
2022-2024
Bologna Research Area
2006-2023
Institut des Sciences Sociales du Politique
2021-2022
Istituto di Scienze Marine del Consiglio Nazionale delle Ricerche
2010-2022
Stockholm University
2013-2021
Bolin Centre for Climate Research
2013-2021
Confederazione Nazionale dell'Artigianato e Della Piccola e Media Impresa
2019-2020
The burial of terrestrial organic carbon (terrOC) in marine sediments contributes to the regulation atmospheric CO2 on geological timescales and may mitigate positive feedback present-day climate warming. However, fate terrOC settings is debated, with uncertainties regarding its degradation during transport. Here, we employ compound-specific radiocarbon analyses biomarkers determine cross-shelf transport times. For World's largest marginal sea, East Siberian Arctic shelf, requires 3600 ± 300...
Abstract This study seeks an improved understanding of how matrix association affects the redistribution and degradation terrigenous organic carbon (TerrOC) during cross‐shelf transport in Siberian margin. Sediments were collected at increasing distance from two river outlets (Lena Kolyma Rivers) one coastal region affected by erosion. Samples fractionated according to density, size, settling velocity. The chemical composition each fraction was characterized using elemental analyses...
Abstract Recent hypotheses, based on atmospheric records and models, suggest that permafrost carbon (PF-C) accumulated during the last glaciation may have been an important source for CO 2 rise post-glacial warming. However, direct physical indications such PF-C release so far absent. Here we use Laptev Sea (Arctic Ocean) as archive to investigate destabilization glacial–interglacial period. Our results show evidence massive supply of from Siberian soils a result severe active layer...
The recent expansion of Atlantic waters into the Arctic Ocean represents undisputable evidence rapid changes occurring in this region. Understanding past variability “Atlantification” is thus crucial providing a longer perspective on modern changes. Here, we reconstruct history Atlantification along eastern Fram Strait during 800 years using precisely dated paleoceanographic records based organic biomarkers and benthic foraminiferal data. Our results show water mass properties that commenced...
The greening of previously barren landscapes in the Arctic is one most relevant responses terrestrial ecosystem to climate change. Analyses satellite data (available since ~1980) have revealed a widespread tundra advance consistent with recent global warming, but length insufficient resolve long-term variability and precise timing onset. Here, we measured plant-derived biomarkers from an fjord sediment core as proxies for reconstructing past changes vegetation during transition Little Ice...
Abstract. Ongoing global warming in high latitudes may cause an increasing supply of permafrost-derived organic carbon through both river discharge and coastal erosion to the Arctic shelves. Mobilized permafrost can be either buried sediments, transported deep sea or degraded CO2 outgassed, potentially constituting a positive feedback climate change. This study aims assess fate terrigenous (TerrOC) marine environment by exploring how it changes concentration, composition degradation status...
Abstract Given the potential for permafrost carbon (PF/C)‐climate feedbacks in Siberian‐Arctic land‐ocean system, there is a need understanding fate of thawed‐out PF/C. Here we show that sequestration OC by reactive iron (OC‐Fe) ranges between 0.5 and 22% on Eurasian Arctic Shelf, with higher values Kara Sea (KS) (18 ± 6%) Laptev (LS) (14 4%). The Δ 14 C/δ 13 C signatures OC‐Fe are substantially older more terrestrial than bulk sediment LS but younger dominated marine plankton sources East...
Abstract Climate warming is expected to destabilize permafrost carbon (PF‐C) by thaw‐erosion and deepening of the seasonally thawed active layer thereby promote PF‐C mineralization CO 2 CH 4 . A similar remobilization might have contributed increase in atmospheric during deglacial after last glacial maximum. Using isotopes terrestrial biomarkers (Δ 14 C, δ 13 lignin phenols), this study quantifies deposition originating from sediments Chukchi Sea (core SWERUS‐L2‐4‐PC1). The sediment core...
Warming air and sea temperatures, longer open-water seasons sea-level rise collectively promote the erosion of permafrost coasts in Arctic, which profoundly impacts organic matter pathways. Although estimates on carbon (OC) fluxes from exist for some parts little is known about how much OC transformed into greenhouse gases (GHGs). In this study we investigated two different coastal scenarios Qikiqtaruk – Herschel Island (Canada) estimate potential GHG formation. We distinguished between a...
Abstract. Biogeochemical cycling in the semi-enclosed Arctic Ocean is strongly influenced by land–ocean transport of carbon and other elements vulnerable to environmental climate changes. Sediments are an important part biogeochemical provide opportunity study present historical input fate organic matter (e.g., through permafrost thawing). Comprehensive sedimentary records required compare differences between regions budgets. To this end, Circum-Arctic Sediment CArbon DatabasE (CASCADE) was...
Abstract Enhanced warming of the Northern high latitudes has intensified thermokarst processes throughout permafrost zone. Retrogressive thaw slumps (RTS), where thaw-driven erosion caused by ground ice melt creates terrain disturbances extending over tens hectares, represent particularly dynamic features. Biogeochemical transformation mobilized substrate may release CO 2 to atmosphere and impact downstream ecosystems, yet its fate remains unclear. The Peel Plateau in northwestern Canada...
Abstract Subsea permafrost represents a large carbon pool that might be or become significant greenhouse gas source. Scarcity of observational data causes uncertainties. We here use five 21-56 m long subsea cores from the Laptev Sea to constrain organic (OC) storage and sources, degradation state potential production upon thaw. Grain sizes, optically-stimulated luminescence biomarkers suggest deposition aeolian silt fluvial sand over 160 000 years, with dominant fluvial/alluvial forest-...
Ongoing permafrost thaw in the Arctic may remobilize large amounts of old organic matter. Upon transport to Siberian shelf seas, this material be degraded and released atmosphere, exported off-shelf, or buried sediments. While our understanding fate permafrost-derived matter waters is improving, poor constraints remain regarding degradation Here we use an extensive data set carbon concentrations isotopes (n = 109) inventory terrigenous (terrOC) surficial sediments Laptev East Seas (LS +...
Collapse of permafrost coasts delivers large quantities particulate organic carbon (POC) to Arctic coastal areas. With rapidly changing environmental conditions, sediment and (OC) mobilization transport pathways are also changing. Here, we assess the sources sinks POC in highly dynamic nearshore zone Herschel Island-Qikiqtaruk (Yukon, Canada). Our results show that concentrations sharply decrease, from 15.9 0.3 mg L-1, within first 100-300 m offshore. Simultaneously, radiocarbon ages drop...
Continental shelves host 90% of modern Organic Carbon (OC) burial and play a key role in the sequestration terrigenous OC over geological timescales. The efficiency these systems, however, varies greatly depending on duration exposure to oxic-suboxic conditions during sediment transport. In this study, we use observations across wide range stratigraphic sedimentological scales coupled with geochemistry data from muddy shelf deposits along western Adriatic investigate relation between...
Abstract Major Arctic rivers are undergoing changes due to climate warming with higher discharge and increased amounts of solutes organic carbon (OC) draining into coastal seas. Permafrost thaw mobilizes previously frozen OC the fluvial network where it can be degraded greenhouse gases emitted atmosphere. Degradation during downstream transport, especially particulate (POC), is however poorly characterized. Here, we quantified POC degradation in Kolyma River, largest river system underlain...