Publications

Nitrogen oxides.

Lövblad, G.; Tarrasón, L.; Tørseth, K.

Nitrogen as a threat to European air quality.

Moldanova, J.; Grennfelt, P.; Jonsson, Å.; Simpson, D.; Spranger, T.; Aas, W.; Munthe, J.; Rabl, A.

Nitric oxide response to the April 2010 electron precipitation event: Using WACCM and WACCM-D with and without medium-energy electrons

Smith-Johnsen, Christine; Marsh, Daniel R.; Orsolini, Yvan; Tyssøy, Hilde Nesse; Hendrickx, Koen; Sandanger, Marit Irene J.; Ødegaard, Linn-Kristine Glesnes; Stordal, Frode

Energetic electrons from the magnetosphere deposit their energy in the atmosphere and lead to production of nitric oxide (NO) in the mesosphere and lower thermosphere. We study the atmospheric NO response to a geomagnetic storm in April 2010 with WACCM (Whole Atmosphere Community Climate Model). Modeled NO is compared to observations by Solar Occultation For Ice Experiment/Aeronomy of Ice in the Mesosphere at 72–82°S latitudes. We investigate the modeled NOs sensitivity to changes in energy and chemistry. The electron energy model input is either a parameterization of auroral electrons or a full range energy spectrum (1–750 keV) from National Oceanic and Atmospheric Administration/Polar Orbiting Environmental Satellites and European Organisation for the Exploitation of Meteorological Satellites/Meteorological Operational satellites. To study the importance of ion chemistry for the production of NO, WACCM‐D, which has more complex ion chemistry, is used. Both standard WACCM and WACCM‐D underestimate the storm time NO increase in the main production region (90–110 km), using both electron energy inputs. At and below 80 km, including medium‐energy electrons (>30 keV) is important both for NO directly produced at this altitude region and for NO transported from other regions (indirect effect). By using WACCM‐D the direct NO production is improved, while the indirect effects on NO suffer from the downward propagating deficiency above. In conclusion, both a full range energy spectrum and ion chemistry is needed throughout the mesosphere and lower thermosphere region to increase the direct and indirect contribution from electrons on NO.

Nitric oxide response to the April 2010 electron precipitation event

Smith-Johnsen, Christine; Marsh, Daniel R.; Orsolini, Yvan; Tyssøy, Hilde Nesse; Sandanger, Marit Irene J.; Ødegaard, Linn-Kristine Glesnes; Stordal, Frode

Nitric acid phase partitioning and cycling in the New England coastal atmosphere.

Fischer, E.; Pszenny, A.; Keene, W.; Maben, J.; Smith, A.; Stohl, A.; Talbot, R.

Nitric acid in the stratosphere based on Odin observations from 2001 to 2009- part 1: A global climatology.

Urban, J.; Pommier, M.; Murtagh, D. P.; Santee, M. L.; Orsolini, Y. J.

Ninth EIONET workshop on air quality management and assessment, Oslo, 22-23 November 2004. Proceedings. ETC/ACC Technical paper, 2005/1

Larssen, S.; de Leeuw, F.

NILU’s experience as Reference laboratory for ambient air. Powerpoint presentation. NILU F

Tørnkvist, K.K.

NILUs samarbeid med det europeiske miljøbyrået gjennom 25 år

Guerreiro, Cristina

NILUs klima- og miljøforskning fra pol til pol.

Nygaard, K.

NILU; 40 år i lufta.

Sivertsen, B.

NILU's Strategic Institute Initiatives (SIS) 2016. NILU report

Aas, W.; Rundén-Pran, E.; Breivik, K.; Sundseth, K.; Høiskar, B. A.; Platt, S.; Castell, N.; Schlabach, M.

Each of NILU's Strategic Institute Initiatives (SIS) is required to deliver a popular science report annually to the Research Council. This report contains NILU's final reports for the SIS-projects that ended in 2016, and annual SIS-reports for 2016 for the other SIS-projects.