A5080741985- Marine and coastal ecosystems
- Atmospheric chemistry and aerosols
- Arctic and Antarctic ice dynamics
- Marine Biology and Ecology Research
- Ocean Acidification Effects and Responses
- Odor and Emission Control Technologies
- Methane Hydrates and Related Phenomena
- Atmospheric and Environmental Gas Dynamics
- Microbial Community Ecology and Physiology
- Isotope Analysis in Ecology
- Marine and coastal plant biology
- Algal biology and biofuel production
- Polar Research and Ecology
- Cryospheric studies and observations
- Marine and fisheries research
- Environmental Chemistry and Analysis
- Atmospheric Ozone and Climate
- Water Quality Monitoring and Analysis
- Marine Bivalve and Aquaculture Studies
- Toxic Organic Pollutants Impact
- Industrial Gas Emission Control
- Climate change and permafrost
- Indigenous Studies and Ecology
- Geological Studies and Exploration
- Arctic and Russian Policy Studies
University of Groningen
2014-2024
University of Helsinki
2023
Universidad Autónoma de Madrid
2017
[1] The potentially significant role of the biogenic trace gas dimethylsulfide (DMS) in determining Earth's radiation budget makes it necessary to accurately reproduce seawater DMS distribution and quantify its global flux across sea/air interface. Following a threefold increase data (from 15,000 over 47,000) surface ocean database last decade, new monthly climatologies concentration sea-to-air emission are presented as updates those constructed 10 years ago. Interpolation/extrapolation...
Seawater concentrations of the climate-cooling, volatile sulphur compound dimethylsulphide (DMS) are result numerous production and consumption processes within marine ecosystem. Due to this complex nature, it is difficult predict temporal geographical distribution patterns DMS inclusion into global ocean climate models has only been attempted recently. Comparisons between individual model predictions, ground-truthing exercises revealed that information on functional relationships physical...
Abstract. Phytoplankton identification and abundance data are now commonly feeding plankton distribution databases worldwide. This study is a first attempt to compile the largest possible body of available from different as well individual published or unpublished datasets regarding diatom in world ocean. The obtained originate time series studies spatial studies. effort supported by Marine Ecosystem Model Inter-Comparison Project (MAREMIP), which aims at building consistent for main...
In the marine environment, production of dimethylsulfide (DMS) from dissolved dimethylsulfoniopropionate (DMSP,) -an algal osmolyteis thought to occur mainly through bacterial activity.We have investigated possibility that phytoplankton cells convert DMSP, into DMS, using axenic batch cultures Phaeocystis sp. at different growth stages.DMSP, added medium was converted enzymatically DMS by sp.A culture in exponential phase displayed Michaelis-Menten type kinetics for conversion, yielding a n...
Sea ice is one the largest biomes on earth, yet it poorly described by biogeochemical and climate models. In this paper, published unpublished data sympagic (ice-associated) algal biodiversity productivity have been compiled from more than 300 sea-ice cores organized into a systematic framework. Significant patterns in microalgal community structure emerged Autotrophic flagellates characterize surface communities, interior communities consist of mixed populations pennate diatoms dominate...
The rapid melt of snow and sea ice during the Arctic summer provides a significant source low-salinity meltwater to surface ocean on local scale. accumulation this on, under, around floes can result in relatively thin layers upper ocean. Due small-scale nature these upper-ocean features, typically order 1 m thick or less, they are rarely detected by standard methods, but nevertheless pervasive critically important summer. Observations Multidisciplinary drifting Observatory for Study Climate...
Iron is essential for phytoplankton growth, as it involved in many metabolic processes. It controls photosynthesis well enzymatic As such, iron affects the cell’s energy supply and contributes to assimilation of carbon nitrogen. To determine whether limitation would result stress or induced nitrogen deficiency, an Antarctic Phaeocystis sp. (Prymnesiophyceae) strain was studied its biochemical composition, with main emphasis on intracellular production dimethylsulfoniopropionate (DMSP). DMSP...
The utilization of inorganic carbon species by the marine microalga Phaeocystis globosa (Prymnesiophyceae) and several other algal from different taxa, was investigated determining time course 14 C incorporation in isotopic disequilibrium experiments. From these kinetic data, conclusions can be drawn about species, CO 2 or HCO 3 − , that is being utilized. By comparing uptake kinetics absence presence acetazolamide (AZ) dextran‐bound sulfonamide, inhibitors external carbonic anhydrase (CA),...
The oceans are nutritionally dilute, and finding food is a major challenge for many zooplanktonic predators. Chemodetection necessary successful preycapture, but little known about the infochemicals involved in interaction between herbivorous copepods their phytoplankton prey. We used females of Temora longicornis to investigate chemodetection dimethyl sulfide (DMS) this calanoid copepod quantified its behavioral response plumes DMS using video‐microscopy combination with laser‐sheet...
Abstract Biogenic dimethylsulfide (DMS) is a significant contributor to sulfur flux from the oceans atmosphere, and most source of aerosol non sea-salt sulfate (NSS-SO 4 2− ), key regulator global climate. Here we present longest running time-series DMS-water (DMS W ) concentrations in world, obtained at Rothera Time-Series (RaTS) station Ryder Bay, West Antarctic Peninsula (WAP). We demonstrate first ever evaluation interseasonal interannual variability DMS associated atmosphere coastal...
The increased fraction of first year ice (FYI) at the expense old (second-year (SYI) and multi-year (MYI)) likely affects permeability Arctic cover. This in turn influences pathways gases circulating therein exchange interfaces with atmosphere ocean. We present sea temperature salinity time series from different types relevant to temporal development brine drainage efficiency freeze-up October onset spring warming May. Our study is based on a dataset collected during Multidisciplinary...
MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsTheme Sections 131:307-313 (1996) - doi:10.3354/meps131307 Characteristics of DMSP-lyase in Phaeocystis sp. (Prymnesiophyceae) Stefels J, Dijkhuizen L The marine phytoplankton species is one few microalgae known be able convert dimethylsulfoniopropionate (DMSP) enzymatically into dimethyl sulfide (DMS) and acrylic acid....
A strain of Phaeocystis sp., isolated in the Southern Ocean, was cultured under iron‐ and light‐limited conditions. The cellular content chlorophyll a accessory light‐harvesting (LH) pigments increased low light intensities. Iron limitation resulted decrease all pigments. However, this greatly compensated for by cell volume. Cellular concentrations LH were similar both iron‐replete iron‐deplete cells. Concentrations affected only conditions, wherein suppressed iron limitation. Ratios to...
High‐resolution profiles of ice dimethyl sulfide (DMS) and dimethylsulfoniopropionate (DMSP) concentrations were measured together with a suite ancillary physical biological properties during time series decaying summer‐level first‐year sea throughout December 2004 the Ice Station Polarstern drift experiment (western Weddell Sea, Antarctica). DMSP DMS always maximum at bottom sheet (636–2627 292–1430 n M , respectively) where highest chlorophyll levels also found (15–30 μ g L −1 )....
Abstract. The planktonic haptophyte Phaeocystis has been suggested to play a fundamental role in the global biogeochemical cycling of carbon and sulphur, but little is known about its biomass distribution. We have collected microscopy data genus converted abundance using species-specific conversion factors. Microscopic counts single-celled colonial were obtained both through mining online databases by accepting direct submissions (both published unpublished) from specialists. recorded total...
Antarctic pack ice is inhabited by a diverse and active microbial community reliant on nutrients for growth. Seeking patterns overlooked processes, we performed large-scale compilation of macro-nutrient data (hereafter termed nutrients) in (306 ice-cores collected from 19 research cruises). Dissolved inorganic nitrogen silicic acid concentrations change with time, as expected seasonally productive ecosystem. In winter, salinity-normalized nitrate (C*) sea are close to seawater (Cw),...