Abstract Eddy driven recirculation of Atlantic Water (AW) in the Fram Strait modifies amount heat that reaches Arctic Ocean, but is difficult to constrain ocean models due very small Rossby radius there. In this study, we explore effect resolved eddies on AW circulation a locally eddy‐resolving simulation global Finite‐Element‐Sea ice‐Ocean Model (FESOM) integrated for years 2000–2009, by focusing seasonal cycle. An eddy‐permitting serves as control run. Our results suggest resolving local...

Abstract Primary production in the Central Arctic Ocean (CAO) is limited by light and bioavailable nutrients. With decline of sea‐ice cover recent decades, resulting increase availability, nitrate limitation has been speculated to become more prominent. We used an eddy‐permitting biogeochemical model simulation estimate advective fluxes at different spatio‐temporal scales (synoptic, mesoscale sub‐mesoscale) over 1985–2015 period. found that pan‐Arctic continental slope contributes...

Abstract Submesoscale flows are energetic motions on scales of several kilometers that may lead to substantial vertical motions. Here we present satellite and ship radar as well underway conductivity‐temperature‐depth Acoustic Doppler Current Profiler observations a cyclonic submesoscale filament in the marginal ice zone Fram Strait. The created 500‐m thin 50‐km long sea streak extends >250‐m depth with negative/positive density anomaly within/below halocline. frontal jets 0.5 m/s...

Climate models project that the Arctic Ocean may experience ice-free summers already in second half of this century. This have severe repercussions on phytoplankton bloom dynamics and associated cycling carbon surface waters. We currently lack baseline knowledge seasonal microbial communities, which is needed order to better estimate effects such changes ecosystem functioning. Here we present a comparative study polar summer communities (eastern) ice-covered (western) hydrographic regimes at...

Abstract. In coupled biogeochmical–ocean models, the choice of numerical schemes in ocean circulation component can have a large influence on distribution biological tracers. Biogeochemical models are traditionally to general (OGCMs), which based dynamical cores employing quasi-regular meshes, and therefore utilize limited spatial resolution global setting. An alternative approach is use an unstructured-mesh model, allows variable mesh resolution. Here, we present initial results coupling...

Warm and salty Atlantic Water is transported by the Norwegian Current through Nordic Seas. A fraction of it enters Arctic Ocean where contributes significantly to its heat budget. Resolving complex circulation structure in Seas, particular eddies, presents a numerical challenge ocean models. Here, we present hindcast experiment for years 1969–2009 with global configuration Finite Element Sea-ice Model, employing high-resolution mesh Seas (4.5 km). We show that substantial improvements can be...

Abstract Large amounts of atmospheric carbon can be exported and retained in the deep sea on millennial time scales, buffering global warming. However, while Barents Sea is one most biologically productive areas Arctic Ocean, retention times were thought to short. Here we present observations, complemented by numerical model simulations, that revealed a widespread lateral injection approximately 2.33 kt C d −1 from shelf some 1,200 m Nansen Basin, driven Bottom Water transport. With...

In the rapidly changing Arctic Ocean, marine primary productivity is tightly linked to balance between light and nutrient limitation. To capture this in ocean general circulation biogeochemical models (OGCBMs), a good representation of physics important due tight bio-physical coupling Arctic. Using horizontal model resolution few kilometers makes it possible resolve an increasing number small scale processes, that otherwise need be parameterized OGCBMs. Such high is, however, commonly not...

Abstract Compared to land‐based sources, mussel aquaculture provides food products with a high‐quality protein content and low carbon footprint. At the same time, cultures store nutrients in their tissue that are removed from system through harvesting. However, increasingly development of suspended bivalve coastal zone also comes price as ecological carrying capacity ecosystem may be exceeded. The present study aims support future fjord‐management by estimating nutrient budgets impacts...

Seasonal deoxygenation of coastal waters has been observed with increasing frequency around the world, consequences for ecosystem functioning and continued benthic capacity to buffer hypoxia. Here, we present a hydrodynamical-ecological model study Limfjord in Denmark, an example semi-enclosed water body affected by recurring seasonal deoxygenation. Applying observations results, show that temperature, combined wind strength direction are most important controllers short-term interannual...

This study quantified climate-driven changes and spatial variability in key environmental drivers over four decades along Greenland's coastal shelf marine ecosystems evaluated their impacts on biota divided into six regions. We analyzed trends sea ice concentration seasonality, surface temperatures, salinity, freshwater inputs from discharge runoff. West, East, Southeast Greenland were most impacted by climate change, driven increasing temperatures (0.22-0.5 °C decade-1), (10.14-24.93 Gt...

Abstract The Arctic coastal ocean is among the habitats most impacted by climate change due to cumulative impact of several interacting drivers. high‐Arctic Young Sound in north‐east Greenland characterized a short ice‐free period (July–October). system influenced high run‐off, mainly from glacial meltwater during summer (June–September) affecting turbidity. Our analysis showed that has experienced longer without sea ice since 1950 global warming and increased run‐off melting...

The central Arctic Ocean is rapidly changing due to amplified warming and sea ice retreat. Nonetheless, it remains challenging document decipher impacts on key ecosystem processes such as primary production pelagic-benthic coupling, limited observations in this remote area. Here we investigated environmental changes at the Laptev Sea continental slope (60-3400 m water depth) from surface seafloor, by replicating sample transects two decades apart. Mean break-up of occurred earlier mean...

Climate change is a global problem that causes severe local changes to marine biota, ecosystem functioning, and services. The Limfjorden shallow, eutrophic estuary influenced by episodic summer hypoxia with an important mussel fishery suspended culture industry. Three future climate scenarios ranging from low greenhouse gas emissions (SSP1-2.6), intermediate (SSP2-4.5) very high (SSP5-8.5) were combined nutrient load reductions according the National Water Plans investigate potential impacts...

Abstract Globally, mesoscale processes create a rich and filamented pattern in biological productivity. Despite of remoteness harsh environment, observations likewise show an impact on phytoplankton growth the Arctic. Observations sufficiently high resolution are, however, difficult to carry out. Large‐scale models are another way gain knowledge about system. In current study, we use global sea ice‐ocean biogeochemical model, which is eddy resolving Fram Strait, that dynamics has strong...

Mussel mitigation culture is increasingly recognized as a tool to extract nutrients from eutrophic systems by harvesting mussel biomass and contained therein. The net effect of production on the nutrient cycling in ecosystem is, however, not straightforward due interaction with physical- biogeochemical processes regulating functioning. aim present study was evaluate potential using mitigate eutrophication at two contrasting sites: semi-enclosed fjord coastal bay. We applied 3D coupled...

Abstract. In coupled ocean-biogeochemical models, the choice of numerical schemes in ocean circulation component can have a large influence on distribution biological tracers. Biogeochemical models are traditionally to general (OGCMs), which based dynamical cores employing quasi regular meshes, and therefore utilize limited spatial resolution global setting. An alternative approach is use an unstructured-mesh model, allows variable mesh resolution. Here, we present initial results coupling...

European legislation requires monitoring of toxic algae in marine areas where shellfish are harvested for consumption. Monitoring assumes the existence homogeneous water bodies, definition which have important implications stakeholders and consumers. Yet, bodies remains unclear. Here we present a methodology to divide coastal estuarine waters into monitor algae. The proposed method is mainly based on transport, secondarily oceanographic characteristics; salinity sea surface height. We apply...

Larval dispersal is dependent on multiple physical and biotic factors a key driver of population connectivity. Connectivity believed to be important in determining how species will cope changing climate by allowing species' ranges expand or constrict response environmental shifts. In the following study, we couple 3D model system with an individual-based answer whether change effects mussel larvae affect structure demographic connectivity Limfjorden. The Limfjorden Denmark supports large...

Seamounts and carbonate mounds are ubiquitous features of the global deep seascape. They often provide habitat for unique benthic species communities support increased production aggregation phytoplankton, zooplankton, micronekton, fish. interact with surrounding currents generating flow phenomena over a wide range spatial temporal scales including stable Taylor caps, energetic internal waves turbulent mixing, all potential to enhance productivity, biomass, biodiversity in an food-limited...