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Lars Petter Røed

Professor Emeritus - Section for Meteorology and Oceanography

Email larspr@met.no

Room 2416

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Visiting address Kristine Bonnevies hus Blindernveien 31 0371 OSLO

Postal address Pb. 1047 Blindern 0316 Oslo

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Publications in ResearchGate.

Academic Interests

Physical oceanography
Numerical modeling
Climate change
Numerical ocean weather prediction
Mesoscale ocean circulation
Role of eddies in the heat transport of the world oceans.

Higher education and employment history

Education

1979: Dr. Philos Physical Oceanography, University of Oslo.
1972: Cand. Real. Applied Mathmatics, University of Oslo.

Positions held

1994 - : Senior Scientist, Norwegian Meteorlogical Institute.
1987 - : Adjunct Professor of Oceanography, Department of Geosciences, University of Oslo.
1990 - 94: Nansen Centerfor Environmental and Remote Sensing (NERSC), Oslo
1983 - 90: Senior Scientist, Det Norske Veritas/DNV
1981 - 83: Research Associate, Department of Geophysics, University of Oslo
1980 - 81: Postdoc, Florida State University, Tallahasse, USA
1976 - 79: Fellowship within the Global Atmospheric Research Program (GARP).
1974 - 76: Res. ass University of Oslo.
1972 - 73: Res. ass, University of Bergen

Honoraria

1985: Editor’s Citation for Excellence in Refereeing, American Geophysical Union

Cooperation

Nansen Environmental and Remote Sensing Center (NERSC)
Institute of Marine Research (IMR), Bergen.

Tags: Oceanography, Climate change, Numerical modeling

Kristensen, Nils Melsom; Røed, Lars Petter & Sætra, Øyvind (2022). A forecasting and warning system of storm surge events along the Norwegian coast. Environmental Fluid Mechanics. ISSN 1567-7419. doi: 10.1007/s10652-022-09871-4. Full text in Research Archive Show summary
Abstract We consider the Norwegian Meteorological Institute’s system regarding the daily forecasts of water level, and warnings of possible dangerous water level events along the Norwegian coast. The system consists of three parts, the production of water level forecasts, a decision support system, and a system for dissemination of warnings to key users and the general public. Included is a brief description of the forecasting model and the parallel ensemble prediction system, and an assessment of the forecasts produced by them. Based on the assessment of the production models for a three year period we find that they provide sufficiently trustworthy forecasts of water levels for the purpose at hand. Also included is a description of the web based decision support system for issuing warnings. The decision support system was for instance used during the extreme weather event “Elsa” in February 2020, and was found to be an efficient tool both to monitor the event in its early stages and to expedite warnings to key users and the general public.
Hjelmervik, Karina Bakkeløkken; Kristensen, Nils Melsom; Staalstrøm, Andre & Røed, Lars Petter (2017). A simple approach to adjust tidal forcing in fjord models. Ocean Dynamics. ISSN 1616-7341. 67(7), p. 949–958. doi: 10.1007/s10236-017-1067-y. Full text in Research Archive Show summary
To model currents in a fjord accurate tidal forcing is of extreme importance. Due to complex topography with narrow and shallow straits, the tides in the innermost parts of a fjord are both shifted in phase and altered in amplitude compared to the tides in the open water outside the fjord. Commonly, coastal tide information extracted from global or regional models is used on the boundary of the fjord model. Since tides vary over short distances in shallower waters close to the coast, the global and regional tidal forcings are usually too coarse to achieve sufficiently accurate tides in fjords. We present a straightforward method to remedy this problem by simply adjusting the tides to fit the observed tides at the entrance of the fjord. To evaluate the method, we present results from the Oslofjord, Norway. A model for the fjord is first run using raw tidal forcing on its open boundary. By comparing modelled and observed time series of water level at a tidal gauge station close to the open boundary of the model, a factor for the amplitude and a shift in phase are computed. The amplitude factor and the phase shift are then applied to produce adjusted tidal forcing at the open boundary. Next, we rerun the fjord model using the adjusted tidal forcing. The results from the two runs are then compared to independent observations inside the fjord in terms of amplitude and phases of the various tidal components, the total tidal water level, and the depth integrated tidal currents. The results show improvements in the modelled tides in both the outer, and more importantly, the inner parts of the fjord.
Staalstrøm, Andre & Røed, Lars Petter (2016). Vertical mixing and internal wave energy fluxes in a sill fjord. Journal of Marine Systems. ISSN 0924-7963. 159, p. 15–32. doi: 10.1016/j.jmarsys.2016.02.005. Full text in Research Archive Show summary
We consider the distribution and level of local vertical mixing inside of the Drøbak Sill in the Oslofjord, Norway. The work is motivated by observations of long periods (∼years) of hypoxic or even anoxic conditions in the innermost basin, episodes attributed to weak vertical mixing. In line with earlier work on the subject we assume that the local vertical mixing level inside of the sill is predominantly determined by the loss of energy of propagating, tidally-induced internal waves whose source is the sill region. To investigate possible differences in vertical mixing we estimate the eddy diffusivity in the various basins based on model simulations and observations using three methods whereby the eddy diffusion coefficient is estimated. The model we use is an ultra high-resolution version of the three-dimensional, hydrostatic ocean model ROMS forced solely by barotropic tide well outside of the sill. To evaluate the sensitivity of the model results we perform sensitivity experiments in which the mesh size and various parameters and parameterizations are varied. We find indeed that the internal waves lose most of their energy before they reach the innermost basin, and hence set the scene for long periods of no deep water renewal. The sensitivity experiments reveal that it is important that the model's mesh size is small enough to resolve the dominant wavelengths of the topography. Moreover, we find that the strength of the turbulence production and hence the mixing depends on the initially chosen stratification. The method we use is generic and may be applied to any sill fjord.
Røed, Lars Petter; Fossum, Ingerid & Carrasco, Ana (2010). Towards eddy resolving ocean prediction off the northern coast of Norway. In Dahlin, H.; Bell, M.; Flemming, N. C. & Petersson, S. E. (Ed.), Coastal to Global Operational Oceanography: Achievements and Challenges. Proceedings of the Fifth International Conference on EuroGOOS. EuroGOOS Office, SMHI, 601 76 Norrkøping, Sweden. ISSN 9789197482868. p. 246–252. Full text in Research Archive Show summary
A first step to enabling eddy-resolving ocean predictions is to investigate the forecast model’s ability to produce realistic mesoscale patterns in the application area. We explore whether the numerical ocean weather prediction system at the Norwegian Meteorological Institute provides reasonable mesoscale patterns in an area covering the Barents Sea and the north-eastern part of the Norwegian Sea. Insight is gained through analyses of results from a nine-year hindcast covering the years 1987–1995. An energy diagnostic tool derived for this particular terrain-following coordinate model is used to investigate processes leading to eddies.
Albretsen, Jon & Røed, Lars Petter (2010). Decadal long simulations of mesoscale structures in the northern North Sea/Skagerrak using two ocean models. Ocean Dynamics. ISSN 1616-7341. 60(4), p. 933–955. doi: 10.1007/s10236-010-0296-0. Full text in Research Archive Show summary
We consider results from two 27-year-long simulation pairs derived using two different ocean models. We focus on the Skagerrak/North Sea area. Each pair consists of the two terrain-following coordinate models ROMS and MIPOM. The first pair utilizes an eddy-permitting grid, that is, a grid in which the Rossby radius is barely resolved. The second pair utilizes an eddy-resolving grid in which the Rossby radius is truly resolved. The goal is to compare the quality of the two models and the two pairs. To this end we derive statistical properties such as probability density functions and compare them with similar statistics derived from observations. Thereby we obtain insight into whether a truly eddy-resolving model is required to realistically capture the mesoscale statistics.We find that eddy resolution is critical to get the mesoscale statistics correct, in particular, the strength of the current jets. Our results also indicate that the improvement gained by employing the eddy-resolving grid is mostly due to a better resolved topography. In particular, we find that this is the case in areas exhibiting prominent topographic features, such as the deep Norwegian Trench cutting into the heart of the northern North Sea/Skagerrak area. The results also highlight the advantage of first performing quality assurance investigations when implementing a new model for a new area.

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Hov, Øystein; Andresen, Lars; Benestad, Rasmus; Eliassen, Anton; Førland, Eirik & Grasbakken, Ove [Show all 14 contributors for this article] (2023). Forskning til samfunnsnytte. Fagbokforlaget. ISBN 9788245045635. 459 p. Full text in Research Archive
Røed, Lars Petter (2019). Atmospheres and Oceans on Computers: Fundamental Numerical Methods for Geophysical Fluid Dynamics. Springer Nature. ISBN 9783319938639. 275 p. Full text in Research Archive

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Røed, Lars Petter (2022). Bølger, skvulp og strømmer: En innføring i havvarsling. Full text in Research Archive Show summary
Oversikt over varsling av bølger, vannstand (tidevann og stormflo), strømmer, sjøis og vær til sjøs ved Meteorologisk institutt. Hvorfor blir det vind og strøm og bølger? Hvorfor endrer vannstanden seg? Hvordan kan man varsle det. Hvor finner man digitale varsler? Bli din egen bølgevarsler.
Røed, Lars Petter (2017). Lofottorsken - tatt av virvlene? Full text in Research Archive
Kristensen, Nils Melsom; Røed, Lars Petter; Staalstrøm, Andre & Hjelmervik, Karina Bakkeløkken (2016). A high resolution ocean model for the Oslofjord. Full text in Research Archive
Røed, Lars Petter (2016). Faglighet og samarbeid på tvers: Einar i et nøtteskall? Full text in Research Archive
Røed, Lars Petter (2016). Bølger og skvulp: Havvarsler hos MET. Full text in Research Archive
Røed, Lars Petter (2016). Fundamentals of two-way nesting for atmosphere and ocean models. Full text in Research Archive
Røed, Lars Petter & Staalstrøm, Andre (2016). Vertical mixing and internal wave energy fluxes in a sill fjord. Full text in Research Archive
Røed, Lars Petter & Kristensen, Nils Melsom (2016). Towards an operational fine scale Oslofjord model utilizing the curvilinear option in ROMS. Full text in Research Archive
Røed, Lars Petter (2016). Marine forecasting at MET Norway. Full text in Research Archive
Staalstrøm, Andre; Ledang, Anna Birgitta; Kristensen, Nils Melsom; Røed, Lars Petter & Hjelmervik, Karina Bakkeløkken (2016). Dispersion of land-derived substances in the coastal environment. Full text in Research Archive
Hjelmervik, Karina Bakkeløkken; Staalstrøm, Andre; Kristensen, Nils Melsom & Røed, Lars Petter (2016). Adjusting global tidal forcing for use in high-resolution fjord models. Full text in Research Archive
Brodtkorb, André R.; Christensen, Kai Håkon; Røed, Lars Petter & Sætra, Martin Lilleeng (2016). Using the GPU to Predict Drift in the Ocean. Full text in Research Archive
Røed, Lars Petter & Staalstrøm, Andre (2015). Internal wave energy fluxes and vertical mixing in a sill fjord. Full text in Research Archive
Røed, Lars Petter & Kristensen, Nils Melsom (2015). Towards an operational, fine scale Oslofjord model utilizing the curvilinear option in ROMS. Full text in Research Archive
Hjelmervik, Karina Bakkeløkken; Røed, Lars Petter; Kristensen, Nils Melsom; Gusdal, Yvonne; Staalstrøm, Andre & Isachsen, Peter [Show all 7 contributors for this article] (2014). Refined ocean models for the Oslofjord systems. Full text in Research Archive
Røed, Lars Petter (2014). The MET Norway contribution to MyOcean. Full text in Research Archive
Røed, Lars Petter (2014). MET Norway activities relevant to Arctic ROOS. Full text in Research Archive
Røed, Lars Petter; Kristensen, Nils Melsom; Melsom, Arne; Lien, Vidar Surén; Gusdal, Yvonne & Albretsen, Jon [Show all 7 contributors for this article] (2014). Evaluation of results from a 33 year-long ocean hindcast. Full text in Research Archive
Røed, Lars Petter (2014). Summary of results BaSIC project. Full text in Research Archive
Røed, Lars Petter (2014). Eddy formation west of the Lofoten Archipelago. Full text in Research Archive
Røed, Lars Petter (2014). Barents Sea Ice and Currents (BaSIC) - revisited. Full text in Research Archive
Røed, Lars Petter (2014). Northeast Arctic Cod eggs – Gone with the eddies? Full text in Research Archive
Røed, Lars Petter (2014). FoU hos MET: Arbeidsområder og eksempler fra «sentrale» prosjekter. Full text in Research Archive
Røed, Lars Petter (2014). Ocean Forecasting: A hopeless undertaking? Full text in Research Archive
Røed, Lars Petter (2014). Tor's early science days: Upwelling at an ice edge. Full text in Research Archive
Røed, Lars Petter (2014). FoU hos MET: Arbeidsområder og eksempler fra «sentrale» prosjekter. Full text in Research Archive
Røed, Lars Petter (2014). Evaluating results from a ~30 year-long ocean hindcast. Full text in Research Archive
Røed, Lars Petter (2014). Lofottorsken – tatt av virvelen? Full text in Research Archive
Røed, Lars Petter (2013). Sea level change. The short story. Full text in Research Archive
Røed, Lars Petter; Smits, John & Kristensen, Nils Melsom (2013). Vær, vind og strøm, Færderseilasen 2013. Full text in Research Archive
Røed, Lars Petter (2013). The new met.no Numerical Oean Weather Prediction system. Full text in Research Archive
Røed, Lars Petter (2013). Kan vi varsle strømmer i hav og fjord? Full text in Research Archive
Røed, Lars Petter & Kristensen, Nils Melsom (2013). Preliminary results BaSIC. Full text in Research Archive
Røed, Lars Petter (2013). Revisiting old sins: One-way nesting or downscaling techniques. Full text in Research Archive
Røed, Lars Petter & Staalstrøm, André (2013). Blanding og anoksiske forhold i indre Oslofjord. Full text in Research Archive
Røed, Lars Petter (2013). Vær, vind og strøm for seilere. Full text in Research Archive
Røed, Lars Petter (2013). Lavtrykk og høytrykk i havet: Kan det varsles? Full text in Research Archive
Røed, Lars Petter (2013). Validering av met.no's havmodellprodukter. Full text in Research Archive
Røed, Lars Petter; Kristensen, Nils Melsom & Thorup, Asbjørn J. (2013). Færderseilasen: Strømmen blir avgjørende i år. [Journal]. Seilas nr. 5/2013. Full text in Research Archive
Røed, Lars Petter (2013). Operational ocean prediction systems at MET. Full text in Research Archive
Røed, Lars Petter; Kristensen, Nils Melsom; Isachsen, Pål Erik & Sætra, Øyvind (2013). The triply nested Norwegian numerical ocean weather prediction system: Problems and possible solutions. Full text in Research Archive
Røed, Lars Petter (2013). The new MET Norway NOWP System & Water level forecasts. Full text in Research Archive
Røed, Lars Petter; Kristensen, Nils Melsom; Melsom, Arne; Gusdal, Yvonne & Albretsen, Jon (2013). Presentations BaSIC results. Full text in Research Archive
Røed, Lars Petter (2013). Lavtrykk og Høytrykk i havet: Kan de varsles? Full text in Research Archive
Røed, Lars Petter (2013). The Norwegian contribution to the pan-European Monitoring and Forecasting Service. Full text in Research Archive
Røed, Lars Petter (2013). Ocean Current Models and Forecasting. Full text in Research Archive
Røed, Lars Petter (2013). The Norwegian Ocean Weather Prediction system: A revisit. Full text in Research Archive
Røed, Lars Petter (2012). Vær, vind og strøm. Full text in Research Archive
Røed, Lars Petter (2012). Activities related to Arctic ROOS at met.no. Full text in Research Archive
Røed, Lars Petter & Kristensen, Nils Melsom (2012). Strømmodell for Oslofjorden? Litt historikk og litt om fremtiden. Full text in Research Archive
Simonsen, Magne & Røed, Lars Petter (2012). Vær, Vind & Strøm Skagen Race 2012. Full text in Research Archive
Røed, Lars Petter (2012). Ocean model and results using FORTRAN programming. Full text in Research Archive
Røed, Lars Petter & Kristensen, Nils Melsom (2012). Evaluation of eddy resolving models: Methods and examples. Full text in Research Archive
Røed, Lars Petter (2012). Vær, vind og strøm for seilere. Full text in Research Archive
Røed, Lars Petter (2012). Vær, vind og strøm. Full text in Research Archive
Røed, Lars Petter (2012). The Færder Race 2012. Full text in Research Archive
Røed, Lars Petter (2012). Operational Ocean Forecasting, Norway. Full text in Research Archive
Røed, Lars Petter (2012). The Norwegian Meteorological Institute’s Ocean Monitoring and Forecasting Services. Full text in Research Archive
Røed, Lars Petter (2012). The TOPAZ ocean monitoring and forecasting system at met.no. Full text in Research Archive
Røed, Lars Petter & Kristensen, Nils Melsom (2011). Circulation in the Lofoten-Vesterålen area. Full text in Research Archive
Røed, Lars Petter (2011). Vær, vind og strøm for seilere. Full text in Research Archive
Røed, Lars Petter & Kristensen, Nils Melsom (2011). Eddy pinching off Lofoten. Full text in Research Archive
Røed, Lars Petter; Brostrøm, Gøran; Isachsen, Pål Erik; Kristensen, Nils Melsom & Engedahl, Harald (2011). Numerical Ocean Weather Prediction: A quest for computer power and capacity. META. ISSN 1890-1956. p. 28–31. Full text in Research Archive Show summary
To predict the drift and spreading of nutrients, algae blooms, oil and contaminants in the ocean, one of the key elements besides wind and waves is accurate predictions of ocean currents, temperature and salinity or “ocean weather”. The same is true regarding drift of floating objects such as ships, small crafts, containers, man overboard, icebergs and sea-ice. In addition such predictions are of crucial importance for the offshore industry, fisheries and for marine operations in general. The prediction of the ocean weather is, however, a continuous quest for more computer power and capacity.
Røed, Lars Petter (2011). Operational models: The NorKyst800 LV application. Full text in Research Archive
Røed, Lars Petter (2011). Ocean and sea-ice in climate research. Full text in Research Archive
Røed, Lars Petter (2011). Hva skjuler knappen “Hav og kyst” på yr. no. Full text in Research Archive
Simonsen, Magne; Kristensen, Nils Melsom & Røed, Lars Petter (2011). Vær, Vind & Strøm Skagen Race 2011. Full text in Research Archive
Debernard, Jens & Røed, Lars Petter (2011). Dynamical downscaling of regional wave climate in the northern North Atlantic; results and challenges. Full text in Research Archive
Røed, Lars Petter & Smits, John (2011). Vær, vind og strøm under Færderseilasen 2011. Full text in Research Archive
Røed, Lars Petter & Smits, John (2011). Vær, bølger og strøm under SkagEx11. Full text in Research Archive
Røed, Lars Petter; Kristensen, Nils Melsom & Simonsen, Magne (2011). Intet er normalt i Skagerrak. [Journal]. Seilmagasinet 5/2011. Full text in Research Archive
Kristensen, Nils Melsom & Røed, Lars Petter (2011). Evaluation of an eddy-resolving model for the Lofoten-Vesterålen area. Full text in Research Archive
Røed, Lars Petter (2010). Hvorfor det er vanskeligere å varsle strøm i havet enn vind og bølger. Full text in Research Archive
Røed, Lars Petter & Smits, John (2009). Færderseilasen 2009: Varsler av vær, vind og strøm. Full text in Research Archive
Røed, Lars Petter & Albretsen, Jon (2009). Decadal long simulations of mesoscale structures in the Skagerrak/North Sea. Full text in Research Archive
Røed, Lars Petter (2008). Klimautviklingen: Trender til lands og til vanns. Hva sier IPCC? Full text in Research Archive
Røed, Lars Petter; Kristensen, Nils Melsom; Hjelmervik, Karina Bakkeløkken & Staalstrøm, Andre (2016). A high-resolution, curvilinear ROMS model for the Oslofjord. Norwegian Meteorological Institute. Full text in Research Archive
Røed, Lars Petter; Lien, Vidar Surén; Melsom, Arne; Kristensen, Nils Melsom; Gusdal, Yvonne & Ådlandsvik, Bjørn [Show all 7 contributors for this article] (2015). BaSIC Technical Report 4, Part II: Addendum. Norwegian Meteorological Institute. Full text in Research Archive
Røed, Lars Petter; Lien, Vidar Surén; Melsom, Arne; Kristensen, Nils Melsom; Gusdal, Yvonne & Albretsen, Jon (2015). Evaluation of long-term hindcasted Norwegian Sea currents and hydrography II: Final Report Norwegian Sea Hindcast (NoSH) project. Norwegian Meteorological Institute. Full text in Research Archive
Røed, Lars Petter; Lien, Vidar Surén; Melsom, Arne; Kristensen, Nils Melsom; Gusdal, Yvonne & Albretsen, Jon (2015). Evaluation of long-term hindcasted Norwegian Sea currents and hydrography I. Final Report Norwegian Sea Hindcast (NoSH) project. Norwegian Meteorological Institute. Full text in Research Archive
Røed, Lars Petter; Lien, Vidar Surén; Melsom, Arne; Kristensen, Nils Melsom; Gusdal, Yvonne & Ådlandsvik, Bjørn [Show all 7 contributors for this article] (2015). BaSIC Technical Report 4. Part I: Evaluation of the BaSIC4 long term hindcast results. Norwegian Meteorological Institute. Full text in Research Archive
Røed, Lars Petter; Lien, Vidar Surén; Melsom, Arne; Kristensen, Nils Melsom; Gusdal, Yvonne & Ådlandsvik, Bjørn (2014). Evaluation of the BaSIC20 long term hindcast results. BaSIC Technical Report 3. Meteorologisk institutt. Full text in Research Archive
Kristensen, Nils Melsom; Melsom, Arne; Gusdal, Yvonne; Røed, Lars Petter; Albretsen, Jon & Ådlandsvik, Bjørn (2014). BaSIC Validation - Addendum 2. Meteorologisk institutt. Full text in Research Archive
Røed, Lars Petter (2014). Atmospheres and Oceans on Computers: Fundamentals. Universitetet i Oslo. Full text in Research Archive
Eldevik, Tor; Reigstad, Marit; Falck, Eva; Gerland, Sebastian; Jentoft, Sissel & Johnsen, Geir [Show all 10 contributors for this article] (2014). Arven efter Nansen. Forskningsplan for det sentrale og nordlige Barentshavet. UiT Norges arktiske universitet. Full text in Research Archive
Kristensen, Nils Melsom; Melsom, Arne; Gusdal, Yvonne; Røed, Lars Petter; Ådlandsvik, Bjørn & Albretsen, Jon (2013). BaSIC validation - addendum 1. Norwegian Meteorological Institute. Full text in Research Archive
Røed, Lars Petter & Kristensen, Nils Melsom (2013). BaSIC Technical Report No. 1, The triply nested model system. Norwegian Meteorological Institute. Full text in Research Archive
Røed, Lars Petter; Kristensen, Nils Melsom; Melsom, Arne; Gusdal, Yvonne; Albretsen, Jon & Ådlandsvik, Bjørn (2013). BaSIC Technical Report No. 2: Discussions and conclusions from the pre-production run. Norwegian Meteorological Institute. Full text in Research Archive
Røed, Lars Petter (2013). Atmospheres and Oceans on Computers: Fundamentals. 7Letras. Full text in Research Archive
Brodtkorb, André R.; Hagen, Trond Runar & Røed, Lars Petter (2013). One-Layer Shallow Water Models on the GPU. Norwegian Meteorological Institute. Full text in Research Archive
Røed, Lars Petter & Kristensen, Nils Melsom (2011). Mid-term report: LOfoten VEsterålen CURrents (LOVECUR) Phase II. Meteorologisk institutt. Full text in Research Archive
Røed, Lars Petter & Budgell, W. Paul (2011). KARBIAC Phase II b Final Report: Description of model and discussion of model results. Meteorologisk institutt. Full text in Research Archive
Røed, Lars Petter & Kristensen, Nils Melsom (2010). LOVECUR Final Report: Description of model and discussion of the model results. Meteorologisk institutt. Full text in Research Archive

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Published Dec. 10, 2013 7:55 PM - Last modified Apr. 4, 2022 9:32 AM

Projects

FjordMix
MyOcean
OPNet