Blar i Publikasjoner fra Cristin - NILU på forfatter "Walker, Sam-Erik"
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The AirGAM 2022r1 air quality trend and prediction model
Walker, Sam-Erik; Solberg, Sverre; Schneider, Philipp; Guerreiro, Cristina (Peer reviewed; Journal article, 2023)This paper presents the AirGAM 2022r1 model – an air quality trend and prediction model developed at the Norwegian Institute for Air Research (NILU) in cooperation with the European Environment Agency (EEA) over 2017–2021. ... -
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 (NILU report;25/2020, Research report, 2021)This report presents a review of data assimilation methods applicable to air quality. In the introduction, we first describe a brief history of data assimilation method development in the context of numerical weather ... -
Evaluation and inter-comparison of open road line source models currently in use in the Nordic countries
Berger, Janne; Walker, Sam-Erik; Denby, Bruce; Berkowicz, Ruwim; Løfstrøm, Per; Ketzel, Matthias; Härkönen, Jari; Nikmo, Juha; Karppinen, Ari (Journal article; Peer reviewed, 2010) -
Modelling atmospheric oxidation of 2-aminoethanol (MEA) emitted from post-combustion capture using WRF-Chem
Karl, Matthias; Svendby, Tove Marit; Walker, Sam-Erik; Velken, Anna von Streng; Castell, Nuria (Journal article; Peer reviewed, 2015) -
Monitoring of greenhouse gases and aerosols at Svalbard and Birkenes in 2017 - 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 (NILU report;29/2018, Research report, 2018)The report summaries the activities and results of the greenhouse gas monitoring at the Zeppelin Observatory situated on Svalbard in Arctic Norway during the period 2001-2017, and the greenhouse gas monitoring and aerosol ... -
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 (NILU report;18/2019, Research report, 2019)The report summaries the activities and results of the greenhouse gas monitoring at the Zeppelin Observatory situated on Svalbard in Arctic Norway during the period 2001-2018, and the greenhouse gas monitoring and aerosol ... -
Quantifying the Impact of the Covid-19 Lockdown Measures on Nitrogen Dioxide Levels throughout Europe
Solberg, Sverre; Walker, Sam-Erik; Schneider, Philipp; Guerreiro, Cristina (Peer reviewed; Journal article, 2021)In this paper, the effect of the lockdown measures on nitrogen dioxide (NO2) in Europe is analysed by a statistical model approach based on a generalised additive model (GAM). The GAM is designed to find relationships ... -
A study of the relative expanded uncertainty formula for comparing low-cost sensor and reference measurements
Walker, Sam-Erik; Schneider, Philipp (NILU report;1/2020, Research report, 2020)In this report, we investigate the relative expanded uncertainty (REU) formula for comparing low-cost sensors (microsensors) and reference measurements. The purpose of the REU formula is to check if microsensor measurements ... -
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
Karl, Matthias; Walker, Sam-Erik; Solberg, Sverre; Ramacher, Martin O. P. (Journal article; Peer reviewed, 2019)This paper describes the CityChem extension of the Eulerian urban dispersion model EPISODE. The development of the CityChem extension was driven by the need to apply the model in largely populated urban areas with highly ... -
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 (NILU rapport;32/2022, Research report, 2023)NILU – Norsk institutt for luftforskning har, i samarbeid med Transportanalyse AS, utarbeidet en tiltaksutredning for bedre luftkvalitet i Lørenskog. Utredningen er gjennomført på oppdrag av Lørenskog kommune. Tiltaksutredningen ... -
Tiltaksutredning for lokal luftkvalitet i Tromsø
Weydahl, Torleif; Walker, Sam-Erik; Johnsrud, Mona; Vo, Dam Thanh; Ranheim, Patrick (NILU rapport;26/2019, Research report, 2019)Tiltaksutredningen, med handlingsplan og tiltak, skal bidra til å redusere luftforurensningen til et nivå som tilfredsstiller kravene i forurensningsforskriften. Tiltaksutredningen omfatter en kartlegging av luftkvaliteten ... -
Uncertainties in assessing the environmental impact of amine emissions from a CO2 capture plant
Karl, Matthias; Castell, Nuria; Simpson, David; Solberg, Sverre; Starrfelt, Jostein; Svendby, Tove Marit; Walker, Sam-Erik; Wright, Richard Frederic (Journal article; Peer reviewed, 2014)In this study, a new model framework that couples the atmospheric chemistry transport model system WRF-EMEP and the multimedia fugacity level III model was used to assess the environmental impact of amine emissions to air ... -
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 (Peer reviewed; Journal article, 2020)This paper describes the Eulerian urban dispersion model EPISODE. EPISODE was developed to address a need for an urban air quality model in support of policy, planning, and air quality management in the Nordic, specifically ... -
VOC measurements 2020
Solberg, Sverre; Claude, Anja; Reimann, Stefan; Sauvage, Stéphane; Walker, Sam-Erik (EMEP/CCC-Report;4/2022, Research report, 2022) -
VOC measurements 2021
Solberg, Sverre; Claude, Anja; Reimann, Stefan; Walker, Sam-Erik (EMEP/CCC-Report;4/2023, Research report, 2023)