A5053082937- Marine and coastal ecosystems
- Oceanographic and Atmospheric Processes
- Ocean Acidification Effects and Responses
- Methane Hydrates and Related Phenomena
- Climate variability and models
- Geology and Paleoclimatology Research
- Marine and fisheries research
- Marine Biology and Ecology Research
- Arctic and Antarctic ice dynamics
- Marine Bivalve and Aquaculture Studies
- Atmospheric and Environmental Gas Dynamics
- Coral and Marine Ecosystems Studies
- Coastal and Marine Management
- Geological Studies and Exploration
- Geophysics and Gravity Measurements
- Atmospheric chemistry and aerosols
- Toxic Organic Pollutants Impact
- Arctic and Russian Policy Studies
- Climate change and permafrost
- Isotope Analysis in Ecology
- Solar and Space Plasma Dynamics
- Wind and Air Flow Studies
- Ionosphere and magnetosphere dynamics
- Peatlands and Wetlands Ecology
- Per- and polyfluoroalkyl substances research
Helmholtz-Zentrum Hereon
2020-2024
Max Planck Institute for Meteorology
2015-2022
Universität Hamburg
2011-2021
Max Planck Institute for Comparative and International Private Law
2021
Coastal Impact
2019
Max Planck Society
2014-2015
Abstract Observational reconstructions indicate a contemporary increase in coastal ocean CO 2 uptake. However, the mechanisms and their relative importance driving this globally intensifying absorption remain unclear. Here we integrate carbon dynamics global model via regional grid refinement enhanced process representation. We find that increasing sink is primarily driven by biological responses to climate-induced changes circulation (36%) riverine nutrient loads (23%), together exceeding...
Abstract The North Atlantic is characterized by diatom-dominated spring blooms that results in significant transfer of carbon to higher trophic levels and the deep ocean. These are terminated limiting silicate concentrations summer. Numerous regional studies have demonstrated phytoplankton community shifts lightly-silicified diatoms non-silicifying plankton at onset limitation. However, understand basin-scale patterns ecosystem climate dynamics, nutrient inventories must be examined over...
The implications of climate change and other human perturbations on the oceanic carbon cycle are still associated with large uncertainties. Global-scale modelling studies essential to investigate anthropogenic fluxes but, until now, they have not considered impacts temporal changes in riverine atmospheric inputs P N marine net biological productivity (NPP) air-sea CO2 exchange (FCO2 ). To address this, we perform a series simulations using an enhanced version global ocean biogeochemistry...
Abstract We present the first global ocean‐biogeochemistry model that uses a telescoping high resolution for an improved representation of coastal carbon dynamics: ICON‐Coast. Based on unstructured triangular grid topology model, we globally apply refinement in land‐ocean transition zone to better resolve complex circulation shallow shelves and marginal seas as well ocean‐shelf exchange. Moreover, incorporate tidal currents including bottom drag effects, extend parameterizations model's...
Coastal ecosystems are increasingly experiencing anthropogenic pressures such as climate warming, CO 2 increase, metal and organic pollution, overfishing, resource extraction. Some resulting stressors more direct like pollution fisheries, others indirect ocean acidification, yet they jointly affect marine biota, communities, entire ecosystems. While single-stressor effects have been widely investigated, the interactive of multiple on less researched. In this study, we review literature their...
Climate change affects the marine environment on many levels with profound consequences for numerous biological, chemical, and physical processes. Benthic bioturbation is one of most relevant significant processes benthic-pelagic coupling biogeochemical fluxes in sediments, such as uptake, transport, remineralisation organic carbon. However, only little known about how climate distribution intensity benthic a shallow temperate shelf sea system southern North Sea. In this study, we modelled...
Climate change impact studies for the Northwest European Shelf (NWES) make use of various dynamical downscaling strategies in experimental setup regional ocean circulation models. Projected signals from coupled and uncoupled downscalings with different domain sizes forcing global models show substantial uncertainty. In this paper, we investigate influences strategy on projected changes physical biogeochemical conditions NWES. Our results indicate that uncertainties due to are similar choice...
Climate change is a global threat for marine ecosystems, their biodiversity and consequently ecosystem services. In the realm, protected areas (MPAs) were designated to counteract regional pressures, but they might be ineffective protect vulnerable species habitats, if distribution affected by climate change. We used six Species Distribution Models (GLM, MARS, FDA, RF, GBM, MAXENT) project changes in of eight benthic indicator key under North Sea MPAs 2050 2099. The projected area most will...
Abstract Marine net primary production (NPP) is remarkably high given the typical vertical separation of 50–150 m between depth zones light and nutrient sufficiency, respectively. Here we present evidence that many autotrophs bridge this gap through downward upward migration, thereby facilitating biological pumping rates oceanic NPP. Our model suggests phytoplankton migration (PVM) fuels up to 40% (>28 tg yr −1 N) new directly contributes 25% total NPP (herein estimated at 56 PgC )....
High biological productivity and the efficient export of carbon-enriched subsurface waters to open ocean via continental shelf pump mechanism make mid-latitude shelves like northwest European (NWES) significant sinks for atmospheric CO 2 . Tidal forcing, as one regionally dominant physical forcing mechanisms, regulates mixing-stratification status water column that acts a major control on NWES. Because complexity system spatial heterogeneity tidal impacts, there still are large knowledge...
Variations in the elemental ratios of carbon, nitrogen, and phosphorus marine organic matter (OM) their influence on carbon cycling remain uncertain both open coastal oceans. While observations consistently show enrichment depletion relative to Redfield ratios, many biogeochemical models assume fixed stoichiometry. As a result, they often underestimate biological fixation, limiting ability accurately represent fluxes. Here, we provide comprehensive assessment effects variable OM...
Abstract Arctic coastal permafrost erosion is projected to increase by a factor of 2–3 2100. However, organic matter fluxes from the into ocean have not been considered in Earth system models so far. Here we represent an model and perform simulations with varying properties, such as sinking fraction nutrient content. We find that reduces Ocean CO 2 uptake atmosphere all simulations: 4.6–13.2 TgC yr −1 2100, which ~7–14% Inner uptake. show exerts positive biogeochemical feedback on climate,...
Earth and Space Science Open Archive This preprint has been submitted to is under consideration at Journal of Advances in Modeling Systems (JAMES). ESSOAr a venue for early communication or feedback before peer review. Data may be preliminary.Learn more about preprints preprintOpen AccessYou are viewing the latest version by default [v3]Seamless integration coastal ocean global marine carbon cycle...
Abstract. The fate and cycling of two selected legacy persistent organic pollutants (POPs), PCB 153 γ-HCH, in the North Sea 21st century have been modelled with combined hydrodynamic transport ocean models (HAMSOM FANTOM, respectively). To investigate impact climate variability on POPs century, future scenario model runs for three 10-year periods to year 2100 using plausible levels both situ concentrations atmospheric, river open boundary inputs are performed. This slice mode under a...
Assessment of marine downscaling global model simulations to the regional scale is a prerequisite for understanding ocean feedback atmosphere in climate downscaling. Major difficulties arise from coarse grid resolution models, which cannot provide sufficiently accurate boundary values model. In this study, we first setup stretched (MPIOM) focus on North Sea by shifting poles. Second, (HAMSOM) was performed with higher resolution, while open were provided general, sea surface temperatures...
Abstract Previous studies have identified changes in habitat temperature as a major factor leading to the geographical displacement of North Sea cod last decades. However, degree which thermal suitability is presently changing different regions still unclear, or if alone (or together with fishery) responsible for this displacement. In study, spatial distribution life stages was modelled from 1967 2015. The model fit point-to-point, spatially resolved at scales 20 km. results show that has...
Abstract Anthropogenic climate change is expected to strengthen upwelling events worldwide, driven by an increase of upwelling-favorable winds. However, Earth System Models (ESM) tend underestimate regional processes due their coarse grid resolution, which can lead local biases. We use a high-resolution ocean model ( $${1/12}^{\circ }$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msup> <mml:mrow> <mml:mn>1</mml:mn> <mml:mo>/</mml:mo> <mml:mn>12</mml:mn> </mml:mrow>...