A5055215482- Oceanographic and Atmospheric Processes
- Advanced Computational Techniques and Applications
- Arctic and Antarctic ice dynamics
- Methane Hydrates and Related Phenomena
- Underwater Acoustics Research
- Geology and Paleoclimatology Research
- Climate variability and models
- Climate change and permafrost
- Marine and coastal ecosystems
- Reservoir Engineering and Simulation Methods
- Ocean Acidification Effects and Responses
- Geological Studies and Exploration
- Atmospheric and Environmental Gas Dynamics
- Cryospheric studies and observations
- Marine Biology and Ecology Research
- Isotope Analysis in Ecology
- Marine and fisheries research
- Hydrocarbon exploration and reservoir analysis
- Coastal and Marine Management
University of Bergen
2018-2023
Bjerknes Centre for Climate Research
2018-2023
Earth Science Institute of the Slovak Academy of Sciences
2018
Abstract Hydrographic measurements from ships, autonomous profiling floats, and instrumented seals over the period 1986–2016 are used to examine temporal variability in open-ocean convection Greenland Sea during winter. This process replenishes deep ocean with oxygen is central maintaining its thermohaline properties. The deepest densest mixed layers were located within cyclonic gyre exhibited large interannual variability. Beginning winter 1994, a transition deeper (>500 m) took place....
Abstract Poleward ocean heat transport is a key process in the earth system. We detail and review northward Atlantic Water (AW) flow, Arctic Ocean transport, loss to atmosphere since 1900 relation sea ice cover. Our synthesis largely based on ice‐ocean model forced by reanalysis (1900–2018) corroborated comprehensive hydrographic database (1950–), AW inflow observations (1996–), other long‐term time series of extent (1900–), glacier retreat (1984–), Barents Sea hydrography (1900–). The...
Dense waters formed in the Nordic Seas spill across gaps Greenland-Scotland Ridge into abyss of North Atlantic to feed lower limb Meridional Overturning Circulation. The overflow water transport is well known, but open questions remain regarding where and how dense are transported ridge. Here we develop a regional high-resolution version an inverse method called Total Matrix Intercomparison, which combines hydrographic geochemical tracer observations between 2000 2019 resolve pathways that...
The Greenland Sea gyre is one of the few areas where water column ventilated through open ocean convection. This process brings both anthropogenic carbon and oxygen from atmosphere surface into deep ocean, also makes interesting in a global perspective. In this study, combination ship- float-based observations during period 1986–2016 are analysed. Previous studies have shown warming salinification upper 2000 m until 2011. extended data record used here shows that continuing 2016. addition,...
Overflow water from the Nordic Seas comprises deepest limb of Atlantic Meridional Overturning Circulation, yet questions remain as to where it is ventilated and how reaches Greenland-Scotland Ridge. Here we use historical hydrographic data 2005-2015, together with satellite altimeter data, elucidate source regions Denmark Strait Faroe Bank Channel overflows pathways feeding these respective sills. A recently-developed metric used calculate similar two parcels are, based on potential density...
Abstract About a quarter of the total anthropogenic CO 2 emissions during industrial era has been absorbed by ocean. The rate limiting step for this uptake is transport carbon (C ant ) from ocean mixed layer where it to interior stored. While generally known that deep water formation sites are important vertical transport, exact magnitude fluxes across base in different regions uncertain. Here, we determine where, when, and how much C injected mixed‐layer into since start industrialized era....
The Atlantic Meridional Overturning Circulation (AMOC), carrying warm, salty water to high latitudes, is a key component of the global ocean circulation with profound impacts on climate. To sustain AMOC, dense-water formation at northern such as in Nordic Seas and Arctic Ocean, requirement. Here, we use high-resolution (1/12°) reanalysis GLORYS12, corroborated by observations other reanalyses, show that poleward expansion warm waters corresponding sea-ice loss has caused shift dense...
In this case study, we derive and compare estimates of annual net community production (NCP) in the Greenland Sea from Argo float data nitrate, oxygen, dissolved inorganic carbon (DIC). We added tracers system, air-sea gas exchange to 1-D Price-Weller-Pinkel mixing model (Price et al., 1986) tuned (Moore 2015; Brakstad 2019). By reinitializing with every profile, were able estimate NCP as difference between abiotic output profiles. This method has previously been employed various other...
Abstract The Iceland Greenland Seas Project (IGP) is a coordinated atmosphere–ocean research program investigating climate processes in the source region of densest waters Atlantic meridional overturning circulation. During February and March 2018, field campaign was executed over southern that utilized range observing platforms to investigate critical region, including vessel, aircraft, moorings, sea gliders, floats, meteorological buoy. A remarkable feature highly deployment platforms,...
The ocean is a lifeline for human existence, but current practices risk severely undermining sustainability. Present and future social−ecological challenges necessitate the maintenance development of knowledge action by stimulating collaboration among scientists between science, policy, practice. Here we explore not only how such collaborations have developed in Nordic countries adjacent seas also from these regions contributes to an understanding obtain sustainable ocean. Our collective...
Abstract The Greenland Sea produces a significant portion of the dense water from Nordic seas that supplies lower limb Atlantic meridional overturning circulation. Here, we use continuous 10-yr hydrographic record moored profilers to examine dense-water formation in central between 1999 and 2009. Of primary importance for is air–sea heat exchange, 60%–80% lost atmosphere during winter occurs intense, short-lived events called cold-air outbreaks (CAOs). long duration high temporal resolution...
Abstract While a rapid sea ice retreat in the Arctic has become ubiquitous, potential weakening of Atlantic meridional overturning circulation (AMOC) response to global warming is still under debate. As deep mixing occurs open ocean close edge, strength and vertical extent AMOC likely respond ongoing future retreat. Here, we investigate link between changes cover long simulation with EC-Earth–Parallel Ice Sheet Model (PISM) climate model emission scenario RCP8.5. The extended duration...
Abstract Recent work suggests that Oxygen Minimum Zones (OMZs) are sustained by the supply of oxygen‐poor waters rather than export organic matter from local surface layer and its subsequent remineralization inside OMZs. However, mechanisms form maintain OMZs not well constrained, such as origin oxygen oxygenates OMZs, locations where consumption occurs. Here we use an observation‐based transport matrix to determine origins open ocean in terms (a) OMZ volume, (b) survives (c) utilization...
Earth and Space Science Open Archive This preprint has been submitted to is under consideration at Journal of Geophysical Research - Oceans. 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 [v1]Drivers surface salinity changes in Greenland-Iceland Seas on seasonal interannual time scales climate model studyAuthorsHelene...
Earth and Space Science Open Archive This work has been accepted for publication in Reviews of Geophysics. Version RecordESSOAr is a venue early communication or feedback before peer review. Data may be preliminary. Learn more about preprints. preprintOpen AccessYou are viewing an older version [v1]Go to new versionNordic Seas Heat Loss, Atlantic Inflow, Arctic Sea Ice cover over the last centuryAuthorsLars H.SmedsrudiDAilinBrakstadiDEricaMadonnaMorvenMuilwijkiDSiv...
Earth and Space Science Open Archive This work has been accepted for publication in Reviews of Geophysics. Version RecordESSOAr is a venue early communication or feedback before peer review. Data may be preliminary. Learn more about preprints. preprintOpen AccessYou are viewing the latest version by default [v2]Nordic Seas Heat Loss, Atlantic Inflow, Arctic Sea Ice cover over last centuryAuthorsLars H.SmedsrudiDMorvenMuilwijkiDAilinBrakstadiDEricaMadonnaSiv...