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Sam-Erik Walker

Scientist

+47 63 89 80 83

Urban Environment and Industry Department
Kjeller

sew@nilu.no


Sam-Erik Walker

Sam-Erik Walker has 112 publications at NILU:

Revidert tiltaksutredning for lokal luftkvalitet i Stavanger kommune

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

2020

Air quality in Europe – 2020 report

Ortiz, Alberto González; Guerreiro, Cristina; Soares, Joana; Antognazza, Frederico; Gsella, Artur; Houssiau, Michel; Liberti, Luca; Lükewille, Anke; Öztürk, Evrim; Horálek, Jan; Banyuls, Lorena; Targa, Jaume; Schneider, Philipp; Solberg, Sverre; Walker, Sam-Erik; Colette, Augustin

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

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

2020

A presentation of the EPISODE urban scale air quality model and its application to Nordic winter conditions

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

2020

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

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

2020

Networks of air quality sensors and their use for high-resolution mapping of urban air quality

Schneider, Philipp; Castell, Nuria; Hamer, Paul David; Walker, Sam-Erik; Bartonova, Alena

2020

Tiltaksutredning for lokal luftkvalitet i Tromsø

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

2019

Trends in measured NO2 and PM. Discounting the effect of meteorology.

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

2019

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

2019

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

2018

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

2018

Denby, B.R.; Sundvor, I.; Süld, J.; Kristensen, A.; Vallejo, I.; Walker, S.E.

2015

Data assimilation and statistical post-processing for numerical air quality predictions.

Steinbakk, G. H, Thorarinsdottir, T. L.; Lahoz, W. A.; Walker, S.-E.

2014

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.

2014

Using UncertWeb for improved decision making. UncertWeb Consortium Deliverable 3.5.

Heuvelink, G.; Helle, K.; Pebesma, E.; Rasouli, S.; Stasch, C.; Truong, P.; Walker, S.E.

2013

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.

2013

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.

2011

The NILU SURFEX-EnKF land data assimilation system.

Lahoz, W.; Svendby, T.; Walker, S.-E.; Mahfouf, J.-F.

2010

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.

2010

The NILU SURFEX-EnKF land data assimilation system.

Lahoz, W.; Walker, S.-E.; Dammann, D.

2010

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.

2010

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.

2009

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.; Härkonen, J.; Nikmo, J.; Karppinen, A.

2008

Residential outdoor air pollution and lung function in schoolchildren.

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

2008

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.

2007

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

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

2007

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.

2007

Uncertainty mapping for air quality modelling and data assimilation.

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

2007

Updated environmental assessment of the regional impact from the oil activity in the North Sea. Regular atmospheric emissions – consequences.

Knudsen, S.; Solberg, S.; Wathne, B.M.; Høgåsen, T.; Magnusson, J.; Tollefsen, K.E.; Aarrestad, P.A.; Reitan, O.; Stebel, K.; Walker, S.E.

2006

ESA Campaign Database (CDB) User Manual.

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

2006

A generic database for earth observation data. The ESA campaign data service.

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

2005

WP3 Data Management. Powerpoint presentation. Powerpoint presentation.

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

2005

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.

2005

2005

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

2004

ASSET data management.

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

2003

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.

2003

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

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

2003

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

2003

Development of a modeling system able to link hemispheric-regional and local air pollution.

Wind, P.; Tarrasón, L.; Berge, E.; Slørdal, L.H.; Solberg, S.; Walker, S.E.

2002

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.

2002

Operation of an Envisat Validation Data Centre. Estec Contract No 14419/00/NL/SF. Final report.

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

2002

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.

2002

Environmental assessment of the regional impact from the oil activity in the Norwegian Sea. Regular atmospheric emissions – consequences.

Solberg, S.; Walker, S.E.; Skjelkvåle, B.L.; Høgåsen, T.; Molvær, J.; Larssen, T.; Aarrestad, P.A.; Reitan, O.

2002

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.

2001

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.

1999

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.

1999

Air pollution exposure monitoring and estimation. Part V: Traffic exposure in adults.

Bartonova, A.; Clench-Aas, J.; Gram, F.; Grønskei, K.E.; Guerreiro, C.; Larssen, S. Tønnesen, D.; Walker, S.-E.

1999

Model Advancements for high Spatial and TEmporal Resolution simulations of environmental toxics (SIS MASTER)

The main goal of the project is to modify and enhance NILUs existing atmospheric models to allow for improved simulation of traditional air pollutants (e.g., NO2, PM2.5, PM10) at very […]

Project period: 2018 – 2021

Concluded

Sam-Erik Walker has 112 publications at NILU:

Revidert tiltaksutredning for lokal luftkvalitet i Stavanger kommune

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

2020

Air quality in Europe – 2020 report

Ortiz, Alberto González; Guerreiro, Cristina; Soares, Joana; Antognazza, Frederico; Gsella, Artur; Houssiau, Michel; Liberti, Luca; Lükewille, Anke; Öztürk, Evrim; Horálek, Jan; Banyuls, Lorena; Targa, Jaume; Schneider, Philipp; Solberg, Sverre; Walker, Sam-Erik; Colette, Augustin

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

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

2020

A presentation of the EPISODE urban scale air quality model and its application to Nordic winter conditions

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

2020

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

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

2020

Networks of air quality sensors and their use for high-resolution mapping of urban air quality

Schneider, Philipp; Castell, Nuria; Hamer, Paul David; Walker, Sam-Erik; Bartonova, Alena

2020

Tiltaksutredning for lokal luftkvalitet i Tromsø

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

2019

Trends in measured NO2 and PM. Discounting the effect of meteorology.

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

2019

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

2019

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

2018

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

2018

Denby, B.R.; Sundvor, I.; Süld, J.; Kristensen, A.; Vallejo, I.; Walker, S.E.

2015

Data assimilation and statistical post-processing for numerical air quality predictions.

Steinbakk, G. H, Thorarinsdottir, T. L.; Lahoz, W. A.; Walker, S.-E.

2014

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.

2014

Using UncertWeb for improved decision making. UncertWeb Consortium Deliverable 3.5.

Heuvelink, G.; Helle, K.; Pebesma, E.; Rasouli, S.; Stasch, C.; Truong, P.; Walker, S.E.

2013

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.

2013

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.

2011

The NILU SURFEX-EnKF land data assimilation system.

Lahoz, W.; Svendby, T.; Walker, S.-E.; Mahfouf, J.-F.

2010

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.

2010

The NILU SURFEX-EnKF land data assimilation system.

Lahoz, W.; Walker, S.-E.; Dammann, D.

2010

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.

2010

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.

2009

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.; Härkonen, J.; Nikmo, J.; Karppinen, A.

2008

Residential outdoor air pollution and lung function in schoolchildren.

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

2008

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.

2007

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

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

2007

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.

2007

Uncertainty mapping for air quality modelling and data assimilation.

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

2007

Updated environmental assessment of the regional impact from the oil activity in the North Sea. Regular atmospheric emissions – consequences.

Knudsen, S.; Solberg, S.; Wathne, B.M.; Høgåsen, T.; Magnusson, J.; Tollefsen, K.E.; Aarrestad, P.A.; Reitan, O.; Stebel, K.; Walker, S.E.

2006

ESA Campaign Database (CDB) User Manual.

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

2006

A generic database for earth observation data. The ESA campaign data service.

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

2005

WP3 Data Management. Powerpoint presentation. Powerpoint presentation.

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

2005

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.

2005

2005

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

2004

ASSET data management.

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

2003

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.

2003

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

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

2003

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

2003

Development of a modeling system able to link hemispheric-regional and local air pollution.

Wind, P.; Tarrasón, L.; Berge, E.; Slørdal, L.H.; Solberg, S.; Walker, S.E.

2002

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.

2002

Operation of an Envisat Validation Data Centre. Estec Contract No 14419/00/NL/SF. Final report.

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

2002

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.

2002

Environmental assessment of the regional impact from the oil activity in the Norwegian Sea. Regular atmospheric emissions – consequences.

Solberg, S.; Walker, S.E.; Skjelkvåle, B.L.; Høgåsen, T.; Molvær, J.; Larssen, T.; Aarrestad, P.A.; Reitan, O.

2002

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.

2001

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.

1999

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.

1999

Air pollution exposure monitoring and estimation. Part V: Traffic exposure in adults.

Bartonova, A.; Clench-Aas, J.; Gram, F.; Grønskei, K.E.; Guerreiro, C.; Larssen, S. Tønnesen, D.; Walker, S.-E.

1999

Model Advancements for high Spatial and TEmporal Resolution simulations of environmental toxics (SIS MASTER)

The main goal of the project is to modify and enhance NILUs existing atmospheric models to allow for improved simulation of traditional air pollutants (e.g., NO2, PM2.5, PM10) at very […]

Project period: 2018 – 2021

Concluded