A5002605853- Marine and coastal ecosystems
- Marine Biology and Ecology Research
- Arctic and Antarctic ice dynamics
- Aquatic Ecosystems and Phytoplankton Dynamics
- Water Quality Monitoring and Analysis
- Cryospheric studies and observations
- Marine and coastal plant biology
- Soil and Water Nutrient Dynamics
- Methane Hydrates and Related Phenomena
- Microbial Community Ecology and Physiology
- Marine and fisheries research
- Isotope Analysis in Ecology
- Marine Bivalve and Aquaculture Studies
- Coastal wetland ecosystem dynamics
- Ocean Acidification Effects and Responses
- Oceanographic and Atmospheric Processes
- Coastal and Marine Management
- Climate change and permafrost
- Geology and Paleoclimatology Research
- Air Quality Monitoring and Forecasting
- Fish Ecology and Management Studies
- Atmospheric and Environmental Gas Dynamics
- Food Industry and Aquatic Biology
- Atmospheric chemistry and aerosols
- Environmental Science and Water Management
Aarhus University
2015-2024
Arctic Research Centre
2020
Danmarks Nationalbank
2010
Mental Research Institute
1999-2008
Environmental Research Institute
1999-2008
Université Laval
1999
University of Copenhagen
1995-1998
University of Helsinki
1998
Roskilde University
1993
Excitation emission matrix fluorescence spectroscopy combined with PARAFAC analysis provides a fast and effective method of characterizing the fluorescent fraction dissolved organic matter (DOM). Fluorescence measurements can be used as tracer for quantitative qualitative changes occurring in DOM pool whole. An earlier study found that signal could modeled by five fractions. This presents an on considerably larger data set (>1,200 samples) resulting from 1-yr sampling program Horsens...
We present the results of a mesocosm experiment investigating production and utilization autochthonous dissolved organic matter (DOM) by plankton community under different inorganic nutrient regimes. Fluorescence spectroscopy combined with parallel factor analysis was applied to study dynamics DOM. Seven independent fluorescent fractions were identified, differing in their spectral characteristics, rates, sensitivity photochemical microbial degradation processes. Five humic fractions, marine...
In the 1980s, Danish coastal waters suffered from eutrophication and several nutrient management plans have been implemented during years to improve ecological status. This study aims at giving a holistic ecosystem perspective on 25 of mitigation measures. We report trends inputs responses these in various chemical biological components. Nutrient land were reduced by ~50 % for nitrogen (N) 56 phosphorus (P) since 1990. These reductions resulted significant parallel declines concentrations,...
Carbon-to-chlorophyll a ratios (C:Chl a; weight : weight) were analyzed for 7578 coastal seawater samples collected from Danish waters 1990 to 2014. The aim was identify the seasonal and spatial dynamics relative nutrient richness study effect of reduced nitrogen loadings over time. C:Chl values lowest during winter, about 15 across all stations. During spring, increased summer between 20 96, depending on annual mean total concentration. An inter-annual sinusoidal model with monthly time...
1. Data for maximum colonization depth ( Z c ) of five groups submerged macrophytes and light attenuation were collected forty‐five Danish lakes 108 non‐Danish lakes. The macrophyte bryophytes, charophytes, caulescent angiosperms, rosette‐type angiosperms Isoetes spp. 2. data showed systematic differences among the in relationship to water transparency. In with low transparency (Secchi disc s less than 7 m) charophytes penetrated deepest followed by bryophytes more transparent grew deepest,...
The optics of chromophoric dissolved organic matter (CDOM) in the Greenland Sea were investigated and compared to results from earlier studies Southeastern North Sea. Absorption at 375 nm (a ) varied 0.77 m −1 detection limit our instrument (0.05 ), with highest values found during summer. spectral slope coefficient (S) ranged 8.2 26.4 µm occurring winter. Seasonal variations situ production degradation CDOM where shown be responsible for trends seen. A negative correlation between S a was...
The spectral pattern of light attenuation in the ultraviolet (UV) and blue region (360–500 nm) was analyzed for seven high Arctic lakes. best description K d versus wavelength obtained with an exponential model similar to used absorption by chromophoric dissolved organic compounds (CDOM), but additional parameter (K back ) that accounts background scattering: urn:x-wiley:19395590:media:lno20004530642:lno20004530642-math-0001 where (λ) is diffuse vertical coefficient at λ S slope...
The Copernicus Marine Services State of Pacific Ocean analysis available data demonstrates that the ocean surrounding Islands is warmer, has higher heat content, with sea level rising at rates
Light compensation points (I,) for growth were low (0.3 to 2.5 pmol n r 2 S-') the temperate marine macroalgae Chondrus crispus, Fucus serratus, Petalonia fascia, Porphyra purpurea and Ulva lactuca measured at 7 'C.These I,-values corresponded those estimated by a physiological model including light absorption quantum yield describe carbon gain, weight specific dark respiration, loss rate thallus (m01 C m-* thallus) loss.Absorption close theoretical maximum all species could not explain...
Abstract Anthropogenic nutrient enrichment is changing the structure and function of coastal ecosystems. These zones are transitions between freshwater marine systems where multiple biogeochemical processes remove, produce, transform organic matter. The extent to which zone merely a conduit for terrestrial (allochthonous) matter versus distinct source autochthonous fueled by eutrophication unclear. To address this issue, we characterized dissolved (DOM) pools in eutrophic estuary with long...
Abstract. Primary production on the coast and in Greenland fjords sustains important local sustenance fisheries. However, unprecedented melting of Ice Sheet (GrIS) is impacting coastal ocean, its effects fjord ecology remain understudied. It has been suggested that as glaciers retreat, primary regimes may be altered, rendering less productive. Here we investigate patterns productivity a northeast (Young Sound, 74∘ N), which receives run-off from GrIS via land-terminating glaciers. We...
To analyse the potential future ecological state of estuaries located in temperate climate (here exemplified with Odense Fjord estuary, Denmark), we combined end-of-the-century change projections from four different models, contrasting land use scenarios ("Agriculture for nature", "Extensive agriculture", "High-tech agriculture" and "Market driven agriculture") two eco-hydrological models. By decomposing variance model-simulated output all scenario model combinations, identified key sources...