A5058521673- Atmospheric chemistry and aerosols
- Atmospheric and Environmental Gas Dynamics
- Marine and coastal ecosystems
- Atmospheric Ozone and Climate
- Ocean Acidification Effects and Responses
- Methane Hydrates and Related Phenomena
- Isotope Analysis in Ecology
- Odor and Emission Control Technologies
- Air Quality Monitoring and Forecasting
- Maritime Transport Emissions and Efficiency
- Vehicle emissions and performance
- Marine Biology and Ecology Research
- Chemical Reactions and Isotopes
- Marine and environmental studies
- Cruise Tourism Development and Management
- Enzyme Structure and Function
- Environmental Policies and Emissions
- Aquatic and Environmental Studies
- Ionosphere and magnetosphere dynamics
- Space Exploration and Technology
- Atmospheric aerosols and clouds
- Microbial metabolism and enzyme function
- Marine and Offshore Engineering Studies
- Offshore Engineering and Technologies
- Hydrocarbon exploration and reservoir analysis
GEOMAR Helmholtz Centre for Ocean Research Kiel
2016-2025
University of Oslo
2023-2024
GEOMAR Technologie GmbH - GTG
2020
Isoprene emissions, primarily of biogenic origin, play an important role in atmospheric chemistry and climate. However, the implications marine isoprene emissions remain underexplored due to sparse situ measurements intricate mechanisms governing upper ocean. This study uses 20 years MODIS satellite observations upscale production loss rates derived from laboratory experiments, enabling global modeling aqueous concentrations emissions. Earth system model simulations with integrated...
Abstract. The climate active trace-gas carbonyl sulfide (OCS) is the most abundant sulfur gas in atmosphere. A missing source its atmospheric budget currently suggested, resulting from an upward revision of vegetation sink. Tropical oceanic emissions have been proposed to close gap budget. We present a bottom-up approach including (i) new observations OCS surface waters tropical Atlantic, Pacific and Indian oceans (ii) further improved global box model show that direct are unlikely account...
Abstract. Parameterizations of surface ocean isoprene concentrations are numerous, despite the lack source/sink process understanding. Here we present and related field measurements in mixed layer from Indian Ocean eastern Pacific to investigate production consumption rates two contrasting regions, namely oligotrophic open coastal upwelling region. Our data show that ability different phytoplankton functional types (PFTs) produce seems be mainly influenced by light, temperature, salinity....
Shipping is the cornerstone of international trade and thus a critical economic sector. However, ships predominantly use fossil fuels for propulsion electricity generation, which emit greenhouse gases such as carbon dioxide methane, air pollutants particulate matter, sulfur oxides, nitrogen volatile organic compounds. The availability Automatic Information System (AIS) data has helped to improve emission inventories from ship stacks. Recent laboratory, shipborne, satellite modeling studies...
Abstract. We use isoprene and related field measurements from three different ocean data sets together with remotely sensed satellite to model global marine emissions. show that using monthly mean satellite-derived chl a concentrations parameterize constant normalized production rate underpredicts the measured oceanic concentration by factor of 19 ± 12. Improving phytoplankton functional type dependent values decreasing bacterial degradation in water column results only slight...
Abstract. Carbonyl sulfide (OCS) and carbon disulfide (CS2) are volatile sulfur gases that naturally formed in seawater exchanged with the atmosphere. OCS is most abundant gas atmosphere, CS2 its important precursor. They have attracted increased interest due to their direct or indirect (CS2 via oxidation OCS) contribution stratospheric sulfate aerosol layer. Furthermore, serves as a proxy constrain terrestrial CO2 uptake by vegetation. Oceanic emissions of both contribute major part...
Short- and long-lived trace gases impact atmospheric chemistry climate, via processes like hydroxyl radical chemistry, aerosol formation, cloud condensation nuclei or the greenhouse effect. As oceans serve as sources sinks for gases, understanding drivers of gas cycling in surface waters their release to atmosphere is crucial climate predictions. Furthermore, there a serious lack information related uppermost ocean, Sea microlayer (SML). Production consumption was investigated five-week...
Abstract. Oceanic emissions of the climate-relevant trace gases carbonyl sulfide (OCS) and carbon disulfide (CS2) are a major source to their atmospheric budget. Their current future emission estimates still uncertain due incomplete process understanding therefore inexact quantification across different biogeochemical regimes. Here we present first concurrent measurements both together with related fractions dissolved organic matter (DOM) pool, i.e., solid-phase extractable sulfur (DOSSPE,...
Abstract During the summer monsoon, western tropical Indian Ocean is predicted to be a hot spot for dimethylsulfide emissions, major marine sulfur source atmosphere, and an important aerosol precursor. Other relevant fluxes, such as isoprene sea spray, should also enhanced, due steady strong winds during monsoon. Marine air masses dominate area excluding influence of continentally derived pollutants. SO234‐2/235 cruise in from July August 2014, directly measured eddy covariance DMS fluxes...
Abstract. Dimethyl sulfide (DMS), dimethylsulfoniopropionate (DMSP) and dimethyl sulfoxide (DMSO) were measured at the Boknis Eck Time Series Station (BE, Eckernförde Bay, SW Baltic Sea) during period February 2009–December 2018. Our results show considerable interannual seasonal variabilities in mixed-layer concentrations of DMS, total DMSP (DMSPt) DMSO (DMSOt). Positive correlations found between particulate (DMSPp) (DMSOp) as well DMSPt DMSOt mixed layer, suggesting a similar source for...
Abstract Carbon disulfide (CS 2 ) has recently gained attention as an important precursor for the atmospheric trace gas carbonyl sulfide (OCS), which delivers sulfur to stratospheric layer and impacts radiative budget of Earth. CS is naturally produced in ocean emitted atmosphere. However, magnitude its marine emissions only poorly constrained due lacking understanding production consumption processes. Here, we present incubation experiments with without UV light treatment provide evidence a...
Abstract. Oceanic emissions of the climate relevant trace gases carbonyl sulfide (OCS) and carbon disulfide (CS2) are a major source to their atmospheric budget. Their current future emission estimates still uncertain due incomplete process understanding and, therefore, inexact quantification across different biogeochemical regimes. Here we present first concurrent measurements both together with related fractions dissolved organic matter (DOM) pool, i.e. solid-phase extractable sulfur...
Abstract. Methane (CH4) is a climate-relevant atmospheric trace gas which emitted to the atmosphere from coastal areas such as Baltic Sea. The oceanic CH4 emission estimates are still associated with high degree of uncertainty partly because temporal and spatial variability in distribution ocean surface layer usually not known. In order determine small-scale dissolved we set up purge trap system significantly improved precision for concentration measurements compared static headspace...
The sea surface microlayer (SML) is the uppermost thin oceanic layer in range of 100µm with properties that are distinct from water below. With an ocean coverage up to 70% it supposed have a significant impact on air-sea gas exchange rates. In global studies, SML often be missing source trace gases, when production and subsequent emissions alone cannot explain observed atmospheric mixing ratios. Despite attention past 20 years, also SOLAS science plan, remains difficult sample...
Bromoform (CHBr3) from the ocean is most important organic compound for atmospheric bromine with an lifetime of ~2-4 weeks. Natural production, being main source oceanic CHBr3, high at coasts and in open upwelling regions due to production by macroalgae phytoplankton. Although highly relevant future halogen burden ozone layer stratosphere, global bromoform its emissions are still poorly constrained observations mostly neglected Earth System Model (ESM) climate projections. Anthropogenically...
Abstract. Oceanic bromoform (CHBr3) is an important precursor of atmospheric bromine. Although highly relevant for the future halogen burden and ozone layer in stratosphere, global CHBr3 production ocean its emissions are still poorly constrained observations mostly neglected climate models. Here, we newly implement marine second version state-of-the-art Norwegian Earth System Model (NorESM2) with fully coupled interactions ocean, sea ice, atmosphere. Our results validated using oceanic from...
Abstract. Oceanic bromoform (CHBr3) is an important precursor of atmospheric bromine. Although highly relevant for the future halogen burden and ozone layer in stratosphere, global CHBr3 production ocean its emissions are still poorly constrained observations mostly neglected climate models. Here, we newly implement marine state-of-the-art Norwegian Earth System Model (NorESM2) with fully coupled ocean-sea-ice-atmosphere biogeochemistry interactions. Our results validated oceanic from...
Abstract. The climate active trace-gas carbonyl sulfide (OCS) is the most abundant sulfur gas in atmosphere. A missing source its atmospheric budget currently suggested, resulting from an upward revision of vegetation sink top-down approaches. Oceanic emissions have been proposed to close gap budget. We present a bottom-up approach including new observations OCS surface waters tropical Atlantic, Pacific and Indian oceans show that direct are insufficient account for source. Extrapolation our...
Abstract Marine isoprene plays a crucial role in the formation of secondary organic aerosol within remote marine boundary layer. Due to scarce field measurements oceanic and limited laboratory‐based studies production, assessing importance on atmospheric chemistry climate is challenging. Calculating in‐field production rates step predict concentrations subsequent emissions atmosphere. The distribution, sources, dominant environmental factors were determined Northwest Pacific Ocean 2019....
Abstract. Our understanding of the biogeochemical cycling climate-relevant trace gas dimethyl sulfide (DMS) in Peruvian upwelling system is still limited. Here we present oceanic and atmospheric DMS measurements which were made during two shipborne cruises December 2012 (M91) October 2015 (SO243) region. Dimethylsulfoniopropionate (DMSP) sulfoxide (DMSO) also measured M91. concentrations 1.9 ± 0.9 2.5 nmol L−1 surface waters 2012, respectively. Nutrient availability appeared to be main...