A5015954677- Methane Hydrates and Related Phenomena
- Coastal wetland ecosystem dynamics
- Marine and coastal ecosystems
- Atmospheric and Environmental Gas Dynamics
- Marine and coastal plant biology
- Geology and Paleoclimatology Research
- Ocean Acidification Effects and Responses
- Geological and Geophysical Studies
- Coastal and Marine Dynamics
- Atmospheric chemistry and aerosols
- Isotope Analysis in Ecology
- demographic modeling and climate adaptation
- Cardiovascular Disease and Adiposity
- Diet and metabolism studies
- Arctic and Russian Policy Studies
- Arctic and Antarctic ice dynamics
- Groundwater and Isotope Geochemistry
- Environmental Impact and Sustainability
- Marine Bivalve and Aquaculture Studies
- Coral and Marine Ecosystems Studies
- Agriculture Sustainability and Environmental Impact
- Mercury impact and mitigation studies
- Water Quality Monitoring and Analysis
- Marine Biology and Ecology Research
- Cryospheric studies and observations
University of Gothenburg
2022-2025
University of Hong Kong
2018-2022
Abstract Salt marshes are highly productive intertidal wetlands providing important ecological services for maintaining coastal biodiversity, buffering against oceanic storms, and acting as efficient carbon sinks. However, about half of these have been lost globally due to human activities climate change. Inundated periodically by tidal water, salt subjected strong surface water groundwater interactions, which affect marsh plant growth biogeochemical exchange with water. This paper reviews...
Abstract Mangroves and saltmarshes are biogeochemical hotspots storing carbon in sediments the ocean following lateral export (outwelling). Coastal seawater pH is modified by both uptake of anthropogenic dioxide natural processes, e.g., wetland inputs. Here, we investigate how mangroves influence coastal carbonate chemistry quantify contribution alkalinity dissolved inorganic (DIC) outwelling to blue budgets. Observations from 45 16 worldwide revealed that >70% intertidal wetlands more...
Maximizing carbon sequestration in mangroves is part of the global effort to combat climate crisis. However, methane (CH4) emissions can partially offset mangroves. Previous estimates have suggested that CH4 organic burial by 20% with substantial freshwater inputs and/or highly impacted Here we resolve magnitude and drivers mangrove using multiple isotopic tracers across a latitudinal gradient. emission offsets were smaller high-salinity (~7%) than freshwater-influenced (~27%) Carbon was...
Abstract Saltmarshes are a blue carbon ecosystem accumulating large quantities of organic in sediments. Some this can be transformed into dissolved inorganic (DIC) and methane (CH 4 ) that may eventually exported to the ocean or atmosphere. Although extensive studies have quantified specific components budget such as burial, limited attention has been given pore‐water‐derived total alkalinity (TA) exports ocean. Here, we lateral (outwelling) 202 ± 160 78 75 mmol m −2 d −1 DIC TA,...
Mangrove soils are highly enriched in organic carbon. Tidal pumping drives seawater and oxygen into mangrove during flood tide releases carbon-rich porewater ebb tides. Here, we resolve semi-diurnal (flood/ebb tides), diel (day/night) weekly (neap/spring tides) drivers of porewater-derived CO2 fluxes two mangroves update global estimates emissions building on earlier observations from other sites. controlled pCO2 variability within the creeks. The highest values (2,585–6,856 µatm) 222Rn...
Coastal ecosystems play a major role in marine carbon budgets, but substantial uncertainties remain the sources and fluxes of coastal dioxide (CO 2 ). Here, we assess when, where, how submarine groundwater discharge (SGD) releases CO to shallow ecosystems. Time-series observations dissolved radon ( 222 Rn, natural tracer) across 40 systems from 14 countries revealed large SGD-derived fluxes. The mean partial pressure was 35 times higher than surface seawater. flux 148 ± 226 millimoles per...
Abstract Rapidly retreating marine‐terminating glaciers potentially release trapped greenhouse gases to the atmosphere. Here, we quantified water‐air CH 4 and N 2 O fluxes across a glacier‐lagoon‐ocean continuum in Iceland. Surface water ranged from 690% supersaturation relative atmospheric equilibrium near glacier 140% on shelf. was undersaturated (84 ± 21%) front approached coastal seawater. The glacial lagoon source atmosphere sink, while nearshore shelf waters were weak of both gases....
Abstract Seagrass meadows are effective carbon sinks due to high primary production and sequestration in sediments. However, methane (CH 4 ) emissions can partially counteract their sink capacity. Here, we measured diffusive sediment‐water sea‐air CO 2 CH fluxes a coastal embayment dominated by Posidonia oceanica the Mediterranean Sea. High‐resolution timeseries observations revealed large spatial temporal variability concentrations (2–36 nM). Lower were observed an area with dense seagrass...
Atmospheric deposition is an important source of nitrogen to coastal waters. In nitrogen-limited waters, the atmosphere can contribute significantly eutrophication and hypoxia. This especially true in China, where emissions have increased dramatically are projected further increase future. Here, we modeled potential future impact change atmospheric on hypoxia Chinese seas. We used changes under two IPCC scenarios that included emission regulation climate (representative concentration pathway...
Abstract Mangrove‐dominated coastlines have high carbon sequestration capacity, but it remains unclear whether tidally outwelled is transformed within the coastal ocean or exported offshore. Here, we used radium isotopes ( 224 Ra and 223 Ra) to investigate outwelling in two mangrove seascapes Brazil across multiple spatial scales. We sampled porewaters define source composition, creek waters resolve tidal cycles, cross‐shelf transects trace seascapes. Radium were positively correlated with...
Nitrous oxide (N2O) distribution and dynamics in high latitude fjords are relatively unknown. Surface water N2O concentrations were measured six located Sweden, Iceland, Greenland, which represent highly diverse environmental conditions terms of oxygen, eutrophication climate. This study provides one the few spatial resolution observations sea-air fluxes currently available fjords. The two Icelandic showed highest emissions (97.6±10.5 μg m⁻²...
Increased meltwater from glaciers may drive localized ocean acidification and CO2 uptake, but the carbonate system dynamics in glacially impacted marine environments remains poorly understood. Here we investigate dissolved inorganic carbon (DIC) total alkalinity (TA) at land-ocean interface along Iceland’s shelf waters June 2023. We examine state drivers of air-sea fluxes. TA surface varied between 1290 2340 μmol kg-1 whereas DIC 1460 2120 kg-1. The lowest values both...
Abstract We report high‐resolution observations of N 2 O sea‐air fluxes at six fjords spanning arctic, subarctic, and temperate climates. Icelandic Swedish were sources 97.6 ± 10.5 19.9 19.3 μg m −2 day −1 , respectively. These showed increasing concentrations toward the head. In contrast, a Greenland fjord exhibited net uptake −8.3 7.8 with decreasing concentration head fjord. Individual appear to have unique drivers such as temperature, salinity, chlorophyll, pH but no overarching driver...
Eutrophication and anoxic hypoxic conditions can drive substantial CH4 production in sediment potentially the water column. However, extent of oxidation column marginal seas remains poorly quantified, leading to a possible overestimation fluxes atmosphere. Here, we investigate fate deep-water analysing its concentration stable isotope (δ13C-CH4) along 5000-km cruise track Baltic Sea. concentrations increased with depth, more so under low oxygen conditions. The median bottom layer...
With increasing atmospheric concentration of carbon dioxide, more CO2 is dissolved in seawater, resulting ocean acidification (OA). The consequences OA can be altered by alkalinity (TA), inorganic (DIC) and freshwater inputs. Here, we study wheter submarine groundwater discharge (SGD) may impact coastal acidification. DIC TA relationship rivers SGD across six countries 16 beaches along the Baltic Sea coastline were resolved. was greater (average = 2521 µmol/kg) than river (1324...
Seagrass meadows are 'blue carbon' ecosystems widely recognised for their potential role in climate change mitigation. Previous studies have focused mainly on carbon storage within and sediments. However, little is known about contribution of outwelling (i.e., lateral transport) to seagrass budgets. Here, radium isotopes (223Ra 224Ra) were used assess dissolved inorganic (DIC) total alkalinity (TA) from a Mediterranean Posidonia oceanica meadow during early autumn. DIC was 114 ± 61 mmol m−2...
Abstract Mangroves store significant amounts of carbon in both sediment and water. Methane (CH 4 ) is often produced anoxic, organic‐rich sediments during degradation released to overlying waters via porewater exchange. Yet, a portion CH can be oxidized CO 2 before emission. Here, we investigate whether oxidation impacts its emissions using high‐temporal resolution concentration stable isotope (δ 13 C‐CH observations collected over 14 tidal cycles Brazilian mangrove creeks with no river...
Greenhouse gas emissions embodied in trade is a growing concern for the international community. Multiple studies have highlighted drawbacks territorial and production-based accounting of greenhouse because it neglects from consumption goods trade. This creates weak carbon leakage complicates agreements on regulations. Therefore, we estimated consumption-based using input-output analysis life cycle assessment to calculate hidden meat dairy products Hong Kong, city predominately reliant...
Abstract Tidewater glaciers are highly vulnerable to climate change due warming from both atmospheric and seawater sources. Most tidewater rapidly retreating, but little is known about how glacial melting modifies coastal biogeochemical cycles. Here, we investigate carbonate nutrient dynamics fluxes in an expanding proglacial tidal lagoon connected Europe's largest glacier Iceland (Vatnajökull). The N:P:Si ratios (2:1:30) imply a system deficient nitrogen. large variations the freshwater...
Mangrove soils are highly enriched in organic carbon. Tidal pumping drives seawater and oxygen into mangrove sediments during flood tide releases carbon-rich porewater ebb tides. Here, we resolve semi-diurnal (flood/ebb tides), diel (day/night) weekly (neap/spring tides) drivers of porewater-derived CO2 fluxes two mangroves update global estimates emissions. controlled pCO2 variability within the creeks. The highest values (2,585-6,856 µatm) 222Rn (2,315-6,159 dpm m-3) lowest pH (6.8-7.1)...