Sam-Erik Walker

Decoding temporal patterns and trends of PM10 pollution over Delhi: a multi-year analysis (2015–2022)

Chetna, NN; Dhaka, Surendra K.; Walker, Sam-Erik; Rawat, Vikas; Singh, Narendra

Screening Programme 2022. New environmental pollutants.

Gundersen, Cathrine Brecke; Reid, Malcolm; Rostkowski, Pawel; Bæk, Kine; Rundberget, Thomas; Vogelsang, Christian; Rødland, Elisabeth; Beylich, Bjørnar; Eikenes, Heidi; Bäcklund, Are; Walker, Sam-Erik; Borgen, Anders Røsrud; Nikiforov, Vladimir; Håland, Alexander; Schmidbauer, Norbert

VOC measurements 2021

Solberg, Sverre; Claude, Anja; Reimann, Stefan; Walker, Sam-Erik

Tiltaksutredning for lokal luftkvalitet i Lørenskog kommune

Høiskar, Britt Ann Kåstad; Walker, Sam-Erik; Weydahl, Torleif; Markelj, Miha; Andersen, André; Lopez-Aparicio, Susana; Grythe, Henrik

VOC measurements 2020

Solberg, Sverre; Claude, Anja; Reimann, Stefan; Sauvage, Stéphane; Walker, Sam-Erik

Appropriate Assimilation Methods for Air Quality Prediction and Pollutant Emission Inversion. An Urban Data Assimilation Systems Report.

Hamer, Paul David; Walker, Sam-Erik; Schneider, Philipp

Revidert tiltaksutredning for lokal luftkvalitet i Stavanger kommune

Weydahl, Torleif; Johnsrud, Mona; Vo, Dam Thanh; Walker, Sam-Erik; Høiskar, Britt Ann Kåstad; Ranheim, Patrick

The urban dispersion model EPISODE v10.0 – Part 1: An Eulerian and sub-grid-scale air quality model and its application in Nordic winter conditions

Hamer, Paul David; Walker, Sam-Erik; Sousa Santos, Gabriela; Vogt, Matthias; Vo, Dam Thanh; Lopez-Aparicio, Susana; Schneider, Philipp; Ramacher, Martin O. P.; Karl, Matthias

Hvordan har luftkvalitet i Europa endret seg under lockdown og hvorfor?

Guerreiro, Cristina; Solberg, Sverre; Walker, Sam-Erik; Schneider, Philipp

Statistical modelling for long-term trends of pollutants – Use of a GAM model for the assessment of measurements of O3, NO2 and PM

Solberg, Sverre; Walker, Sam-Erik; Guerreiro, Cristina; Colette, Augustin

Tiltaksutredning for lokal luftkvalitet i Tromsø

Weydahl, Torleif; Walker, Sam-Erik; Johnsrud, Mona; Vo, Dam Thanh; Ranheim, Patrick

Monitoring of greenhouse gases and aerosols at Svalbard and Birkenes in 2018. Annual report.

Myhre, Cathrine Lund; Svendby, Tove Marit; Hermansen, Ove; Lunder, Chris Rene; Platt, Stephen Matthew; Fiebig, Markus; Fjæraa, Ann Mari; Hansen, Georg Heinrich; Schmidbauer, Norbert; Krognes, Terje; Walker, Sam-Erik

Focused model selection and inference using robust estimators.

Walker, Sam-Erik; Hjort, Nils Lid

Discounting the effect of meteorology on trends in surface ozone: Development of statistical tools

Solberg, Sverre; Walker, Sam-Erik; Schneider, Philipp; Guerreiro, Cristina; Colette, Augustin

Modelling atmospheric oxidation of 2-aminoethanol (MEA) emitted from post-combustion capture using WRF-Chem.

Karl, M.; Svendby, T.; Walker, S.-E.; Velken, A.S.; Castell, N.; Solberg, S.

Method and tool selection within the pilot study of air quality in Poland: Data fusion methodologies.

Karl, M.; Walker, S.-E.

Uncertainties in assessing the environmental impact of amine emissions from a CO2 capture plant.

Karl, M.; Castell, N.; Simpson, D.; Solberg, S.; Starrfelt, J.; Svendby, T.; Walker, S.-E.; Wright, R.F.

Report on integrating the traffic/individual modelling with the air quality modelling. UncertWeb Consortium Deliverable 8.3.

Gerharz, L.; Helle, K.; Pebesma, E.; Pross, B.; Stasch, C.; Rasouli, S.; Timmermans, H.; Denby, B.; Walker, S.E.

Time series analysis of significant wave height data for identification of trends in the ocean wave climate.

Vanem, E.; Walker, S.E.

Probabilistic forecasting of air quality in Oslo. UncertWeb Consortium Deliverable 6.2.

Walker, S.E.; Cornford, D.

WORM – A new open road line source model for low wind speed conditions.

Walker, S.E.

Calculation of dispersion and deposition, April 2009 – April 2010. Environmental surveillance of emissions to air from Snøhvit-Hammerfest LNG.

Liu, L.; Walker, S.E.; Hak, C.; Gjerstad, K.I.

Towards uncertainty mapping in air-quality modelling and assessment.

Denby, B.; Dudek, A.; Walker, S.E.; Costa, A.M.; Monteiro, A.; van den Elshout, S.; Fisher, B.

Ambient air pollution exposure, residential mobility and term birth weight in Oslo, Norway.

Madsen, C.; Gehring, U.; Walker, S.E.; Brunekreef, B.; Stigum, H.; Næss, Ø.; Nafstad, P.

Evaluation and inter-comparison of open road line source models currently in use in the Nordic countries.

Berger, J.; Walker, S.-E.; Denby, B.; Berkowicz, R.; Løfstrøm, P.; Ketzel, M.; Härkönen, J.; Nikmo, J.; Karppinen, A.

Modelling long-term averages of local ambient air pollution in Oslo, Norway: evaluation of nitrogen dioxide, PM10 and PM2.5.

Oftedal, B.; Walker, S.E.; Gram, F.; Mc Innes, H.; Nafstad, P.

WORM – A new open road line source model for low wind speed conditions.

Walker, S.E.

Residential outdoor air pollution and lung function in schoolchildren.

Oftedal, B.; Brunekreef, B.; Nystad, W.; Madsen, C.; Walker, S.E.; Nafstad, P.

Application of data assimilation in open road line source modelling. Case study Oslo II.

Walker, S.E.; Berger, J.

Data assimilation within the Air4EU project: the Athens case.

Slini, T.; Walker, S.E.; Moussiopoulos, N.

Evaluation and inter-comparison of open road line source (ORLS) models currently being used in the Nordic countries. Powerpoint presentation.

Berger, J.; Walker, S.E.; Denby, B.; Berkowicz, R.; Løfstrøm, P.; Ketzel, M.; Kukkonen, J.

Uncertainty mapping for air quality modelling and data assimilation. Powerpoint presentation.

Denby, B.; Costa, A.M.; Monteiro, A.; Dudek, A.; Walker, S.E.; van den Elshout, S.; Fisher, B.

Evaluation and inter-comparison of open road line source models currently being used in the nordic countries: a NORPAC project.

Berger, J.; Walker, S.E.; Denby, B.; Løfstrøm, P.; Ketzel, M.; Berkowicz, R.

Application of data assimilation in open road line source modelling.

Walker, S.E.; Berger, J.

Individual case study report: 4. Data assimilation in open road line source modelling.

Walker, S.E. (eds.)

Dispersion and exposure calculation of PM10, NO2 and benzene for Oslo and Trondheim for the year 2005.

Slørdal, L.H.; Mc Innes, H.; Laupsa, H.; Walker, S.E.

An introduction to Sequential Importance Resampling.

Walker, S.E.

Case study Oslo II: Data assimilation in open road line source modelling. Poster presentation.

Walker, S.E.

ESA Campaign Database (CDB) User Manual.

Vik, A.F.; Krognes, T.; Walker, S.-E.; Bjørndalsæter, S.; Stoll, C.; Bårde, T.; Paltiel, R.; Gloslie, B.

An introduction to sequential importance resampling. Powerpoint presentation.

Walker, S.E.

Development of a simplified photochemistry scheme for urban areas.

Solberg, S.; Walker, S.-E.; Denby, B.

WP3 Data Management. Powerpoint presentation. Powerpoint presentation.

Vik, A.F.; Krognes, T.; Walker, S.E.; Bårde, T.; Paltiel, R.

The RETRO database for observations. Poster presentation.

Vik, A.F.; Bjørndalsæter, S.; Stoll, C.; Krognes, T.; Paltiel, R.; Bårde, T.; Walker, S.-E.; Westbye, A.; Molin, P.

Calculation of person-weighted average concentrations of NO2, PM10 and PM 2,5 in Oslo for 1992-2002.

Walker, S.-E.; Rosland, P.

Dispersion and exposure calculation of PM10, NO2 and benzene for Oslo, Trondheim and Bergen for 2003.

Laupsa, H.; Tønnesen, D.; Krognes, T.; Bruno, M.; Walker, S.E.

Metadata guidelines for the ESA Campaign Data Base (CDB). Version 0.02.

Krognes, T.; Walker, S.E.; Vik, A.F.

Bedre byluft – evaluering av prognosemodell for meteorologi og luftkvalitet vinteren 2003/2004.

Ødegaard, V.; Gjerstad, K.I.; Bjergene, N.; Jablonska, H.T.B.; Walker, S.E.

Calculations of 3-year average concentrations in administrative regions in Oslo for the period 1992-2002.

Walker, S. E.

Further development of a modelling system able to link hemispheric-regional and local air pollution.

Wind, P.; Tarrasón, L.; Slørdal, L.H.; Solberg, S.; Denby, B.; Walker, S.-E.

Air pollution as a function of the distance from a road.

Hagen, L.O.; Larssen, S.; Walker, S.-E.

Bedre byluft. Evaluering av prognosemodell for meteorologi og luftkvalitet vinteren 2002/2003.

Ødegaard, V.; Walker, S.-E.; Midtbø, K. H.; Jablonska, H. T. B.; Gjerstad, K. I.; Bjergene, N.

Conversion of daily to hourly mean based forecast classes for particles in Bedre byluft.

Walker, S.-E.

Implementation of extraction routine for ECMWF data through the Calval web-pages. Final development report.

Vik, A.F.; Krognes, T.; Walker, S.E.; Bårde, T.; Paltiel, R.; Tørnkvist, K.K.; Gloslie, B.; Larsen, R.; Thanh, T.N.

Evaluation of air quality and meteorology forecast model for Norwegian cities 2001-2002.

Jablonska, H.T.B.; Walker, S.E.; Bøhler, T.; Køltzow, M.Ø.; Berge, E.; Bjergene, N.

Calculation of air quality around Oslo airport Gardermoen 2001.

Gram, F.; Walker, S.E.

A real-time operational forecast model for meteorology and air quality during peak air pollution episodes in Oslo, Norway.

Berge, E.; Walker, S.E.; Sorteberg, A.; Lenkopane, M.L.; Eastwood, S.; Jablonska, H.J.; Ødegaard,M.

Evaluation of urban scale time-dependent dispersion model with subgrid elements, in Oslo, Norway.

Grønskei, K.E.; Gram, F.; Larssen, S.; Walker, S.E.

Air quality modelling in assessing impacts of traffic measures in Oslo. Poster presentation.

Bartonova, A.; Clench-Aas, J.; Walker, S E.; Tønnesen, D A.; Larssen, S.

Air pollution exposure monitoring and estimating. Part VI: Ambient exposure of adults in an industrialised region.

Clench-Aas, J.; Bartonova, A.; Grønskei, K E.; Hagen, L.O.; Braathen, O.A.; Walker, S.E.

Air pollution exposure monitoring and estimation. Part IV: Urban exposure in children.

Clench-Aas, J.; Bartonova, A.; Grønskei, K.E.; Walker, S.E.

Dispersion calculations for on-line surveillance in Grenland. Description of programs and Users Guide.

Walker, S. E.; Grønskei, K. E.