Sam Erik Walker

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Mobile phone +47 99700159
Room 821
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Tags: Statistics, Statistics and biostatistics

Publications

  • Solberg, Sverre; Walker, Sam-Erik; Schneider, Philipp & Guerreiro, Cristina (2021). Quantifying the Impact of the Covid-19 Lockdown Measures on Nitrogen Dioxide Levels throughout Europe. Atmosphere. ISSN 2073-4433. 12. doi: 10.3390/atmos12020131. Full text in Research Archive
  • Hamer, Paul David; Walker, Sam-Erik; Sousa Santos, Gabriela; Vogt, Matthias; Vo, Dam Thanh & Lopez-Aparicio, Susana [Show all 9 contributors for this article] (2020). 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. Geoscientific Model Development. ISSN 1991-959X. 13, p. 4323–4353. doi: 10.5194/gmd-13-4323-2020. Full text in Research Archive
  • Hamer, Paul David; Walker, Sam-Erik; Sousa Santos, Gabriela; Vogt, Matthias; Vo, Dam Thanh & Lopez-Aparicio, Susana [Show all 8 contributors for this article] (2020). A presentation of the EPISODE urban scale air quality model and its application to Nordic winter conditions. In Moussiopoulos, Nicolas; Sokhi, Ranjeet S.; Tsegas, George; Fragkou, Evangelia; Chourdakis, Eleftherios & Pipilis, Ioannis (Ed.), Proceedings of Abstracts. 12th International Conference on Air Quality Science and Application. Online Conference. The Air quality Conference. ISSN 9781527258297. p. 70–70.
  • Karl, Matthias; Walker, Sam-Erik; Solberg, Sverre & Ramacher, Martin O. P. (2019). The Eulerian urban dispersion model EPISODE – Part 2: Extensions to the source dispersion and photochemistry for EPISODE–CityChem v1.2 and its application to the city of Hamburg. Geoscientific Model Development. ISSN 1991-959X. 12, p. 3357–3399. doi: 10.5194/gmd-12-3357-2019. Full text in Research Archive
  • Walker, Sam-Erik; Hermansen, Gudmund Horn & Hjort, Nils Lid (2015). Model selection and verification for ensemble based probabilistic forecasting of air pollution in Oslo, Norway. In Samaniego, Francisco J. (Eds.), Proceedings of the 60th World Statistics Congress of the International Statistical Institute, ISI2015. The International Statistical Institute. ISSN 978-90-73592-35-3. p. 3131–3136.
  • Karl, Matthias; Svendby, Tove Marit; Walker, Sam-Erik; Velken, Anna von Streng; Castell Balaguer, Nuria & Solberg, Sverre (2015). Modelling atmospheric oxidation of 2-aminoethanol (MEA) emitted from post-combustion capture using WRF-Chem. Science of the Total Environment. ISSN 0048-9697. 527-528, p. 185–202. doi: 10.1016/j.scitotenv.2015.04.108. Full text in Research Archive
  • Karl, Matthias; Castell, Nuria; Simpson, David; Solberg, Sverre; Starrfelt, Jostein & Svendby, Tove Marit [Show all 8 contributors for this article] (2014). Uncertainties in assessing the environmental impact of amine emissions from a CO2 capture plant. Atmospheric Chemistry and Physics (ACP). ISSN 1680-7316. 14(16), p. 8533–8557. doi: 10.5194/acp-14-8533-2014. Full text in Research Archive
  • Vanem, Erik & Walker, Sam-Erik (2013). Time Series Analysis of Significant Wave Height Data for Identification of Trends in the Ocean Wave Climate. In ASME, conference (Eds.), Proceedings of ASME 2013 32nd International Conference on Ocean, Offshore and Arctic Engineering (OMAE 2013). Volume 2A: Structures, Safety and Reliability. The American Society of Mechanical Engineers (ASME). ISSN 978-0-7918-5532-4. doi: 10.1115/omae2013-10024.
  • Vanem, Erik & Walker, Sam-Erik (2013). Identifying trends in the ocean wave climate by time series analyses of significant wave height data. Ocean Engineering. ISSN 0029-8018. 61, p. 148–160. doi: 10.1016/j.oceaneng.2012.12.042.
  • Walker, Sam-Erik (2012). WORM: A new open road line source model for low wind speed conditions. International Journal of Environment and Pollution. ISSN 0957-4352. 47(1/2/3/4), p. 348–357.
  • Denby, Bruce; Dudek, Agnes V; Walker, Sam-Erik; Costa, Ana Margarida; Monteiro, Alexandra & van den Elshout, Sef [Show all 7 contributors for this article] (2011). Towards uncertainty mapping in air-quality modelling and assessment. International Journal of Environment and Pollution. ISSN 0957-4352. 44(1-4), p. 14–23. doi: 10.1504/IJEP.2011.038398.
  • Slini, Theodora ; Walker, Sam-Erik & Moussiopoulos, Nicolas (2011). Data assimilation within the Air4EU project: the Athens case. International Journal of Environment and Pollution. ISSN 0957-4352. 44(1-4), p. 298–306. doi: 10.1504/IJEP.2011.038430.
  • Walker, Sam-Erik (2011). WORM: A new open road line source model for low wind speed conditions. International Journal of Environment and Pollution. ISSN 0957-4352. 47(1-4), p. 348–357.
  • Berger, Janne; Walker, Sam-Erik; Denby, Bruce; Berkowicz, Ruwim; Løfstrøm, Per & Ketzel, Matthias [Show all 9 contributors for this article] (2010). Evaluation and inter-comparison of open road line source models currently in use in the Nordic countries. Boreal Environment Research. ISSN 1239-6095. 15(3), p. 319–334. Full text in Research Archive
  • Madsen, Christian; Gehring, Ulrike; Walker, Sam-Erik; Brunekreef, Bert; Stigum, Hein & Næss, Øyvind Erik [Show all 7 contributors for this article] (2010). Ambient air pollution exposure, residential mobility and term birth weight in Oslo, Norway. Environmental Research. ISSN 0013-9351. 110(4), p. 363–371. doi: 10.1016/j.envres.2010.02.005.
  • Oftedal, Bente Margaret; Walker, Sam-Erik; Gram, Frederick; McInnes, Harold & Nafstad, Per (2009). Modelling long-term averages of local ambient air pollution in Oslo, Norway: evaluation of nitrogen dioxide, PM10 and PM2.5. International Journal of Environment and Pollution. ISSN 0957-4352. 36(1-3), p. 110–126.
  • Oftedal, Bente Margaret; Brunekreef, Bert; Nystad, Wenche; Madsen, Christian; Walker, Sam-Erik & Nafstad, Per (2008). Residential outdoor air pollution and lung function in schoolchildren. Epidemiology. ISSN 1044-3983. 19(1), p. 129–137. doi: 10.1097/EDE.0b013e31815c0827.

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  • Weydahl, Torleif; Johnsrud, Mona; Vo, Dam Thanh; Walker, Sam-Erik; Høiskar, Britt Ann Kåstad & Ranheim, Patrick (2020). Revidert tiltaksutredning for lokal luftkvalitet i Stavanger kommune.
  • Guerreiro, Cristina; Solberg, Sverre; Walker, Sam-Erik & Schneider, Philipp (2020). Hvordan har luftkvalitet i Europa endret seg under lockdown og hvorfor?
  • Schneider, Philipp; Castell, Nuria; Hamer, Paul David; Walker, Sam-Erik & Bartonova, Alena (2020). Networks of air quality sensors and their use for high-resolution mapping of urban air quality.
  • Walker, Sam-Erik & Hjort, Nils Lid (2018). Focused model selection and inference using robust estimators.
  • Walker, Sam-Erik & Hjort, Nils Lid (2017). Estimation and model selection by data-driven weighted likelihoods.
  • Walker, Sam-Erik & Hjort, Nils Lid (2017). Estimation and model selection by data-driven weighted likelihoods.
  • Walker, Sam-Erik & Hjort, Nils Lid (2017). Estimation and model selection via maximum weighted likelihoods.
  • Walker, Sam-Erik & Hjort, Nils Lid (2017). Focused model selection and inference using robust estimators.
  • Walker, Sam-Erik & Hjort, Nils Lid (2016). Model selection and focused inference using robust estimators.
  • Walker, Sam-Erik & Hjort, Nils Lid (2016). Model selection and focused inference using robust estimators.
  • Walker, Sam-Erik; Hjort, Nils Lid & Hermansen, Gudmund Horn (2015). Model selection and verification for ensemble based probabilistic forecasting of air pollution in Oslo, Norway .
  • Walker, Sam-Erik (2015). Confidence distributions based on M-estimators.
  • Madsen, Christian; Gehring, U; Walker, SE; Brunekreef, B; Stigum, Hein & Næss, Øyvind Erik [Show all 7 contributors for this article] (2009). Ambient Air Pollution Exposure, Residential Mobility and Term Birth Weight in Oslo, Nonway. Epidemiology. ISSN 1044-3983. 20(6), p. S151–S151.
  • Hamer, Paul David; Walker, Sam-Erik & Schneider, Philipp (2021). Appropriate Assimilation Methods for Air Quality Prediction and Pollutant Emission Inversion. An Urban Data Assimilation Systems Report. NILU. ISSN 978-82-425-3027-1. Full text in Research Archive
  • Ortiz, Alberto González; Guerreiro, Cristina; Soares, Joana; Antognazza, Frederico; Gsella, Artur & Houssiau, Michel [Show all 16 contributors for this article] (2020). Air quality in Europe - 2020 report. European Environment Agency. ISSN 978-92-9480-292-7.
  • Solberg, Sverre; Walker, Sam-Erik; Guerreiro, Cristina & Colette, Augustin (2020). Statistical modelling for long-term trends of pollutants - Use of a GAM model for the assessment of measurements of O3, NO2 and PM. ETC/ATNI.
  • Walker, Sam-Erik & Schneider, Philipp (2020). A study of the relative expanded uncertainty formula for comparing low-cost sensor and reference measurements. NILU. ISSN 978-82-425-2997-8. Full text in Research Archive
  • Weydahl, Torleif; Walker, Sam-Erik; Johnsrud, Mona; Vo, Dam Thanh & Ranheim, Patrick (2019). Air quality assessment for improved local air quality in Tromsø. NILU. ISSN 978-82-425-2996-1. Full text in Research Archive
  • Solberg, Sverre; Walker, Sam-Erik & Schneider, Philipp (2019). Trends in measured NO2 and PM. Discounting the effect of meteorology. ETC/ACM.
  • Myhre, Cathrine Lund; Svendby, Tove Marit; Hermansen, Ove; Lunder, Chris Rene; Platt, Stephen Matthew & Fiebig, Markus [Show all 11 contributors for this article] (2019). Monitoring of greenhouse gases and aerosols at Svalbard and Birkenes in 2018. Annual report. NILU. ISSN 978-82-425-2985-5. Full text in Research Archive
  • Myhre, Cathrine Lund; Svendby, Tove Marit; Hermansen, Ove; Lunder, Chris Rene; Platt, Stephen Matthew & Fiebig, Markus [Show all 11 contributors for this article] (2018). Monitoring of greenhouse gases and aerosols at Svalbard and Birkenes in 2017 - Annual report. NILU. ISSN 978-82-425-2952-7. Full text in Research Archive
  • Solberg, Sverre; Walker, Sam-Erik; Schneider, Philipp; Guerreiro, Cristina & Colette, Augustin (2018). Discounting the effect of meteorology on trends in surface ozone: Development of statistical tools. ETC/ACM.
  • Karl, Matthias & Walker, Sam-Erik (2014). Method and tool selection within the pilot study of air quality in Poland: Data fusion methodologies. NILU. ISSN 978-82-425-2700-4.
  • Steinbakk, Gunnhildur Högnadóttir; Thorarinsdottir, Thordis Linda; Lahoz, William A. & Walker, Sam-Erik (2014). Data assimilation and statistical post-processing for numerical air quality predictions. Norsk Regnesentral.
  • Clench-Aas, Jocelyne; Aldrin, Magne; Bartonova, A.; Follestad, Turid; Walker, Sam-Erik & Skjønsberg, Ole Henning [Show all 8 contributors for this article] (2000). The short- and long-term effects of air pollution on symptoms of reduced health in a panel of chool-age children. NILU. ISSN 82-425-1131-4.

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Published Nov. 5, 2014 11:27 AM - Last modified Oct. 5, 2016 11:28 AM

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