Publications

Group report: Global change and the European coast - climate change and economic development.

Rochelle-Newall, E.; Klein, R.J.T.; Nicholls, R.J.; Barrett, K.; Behrendt, H.; Bresser, T.H.M.; Cieslak, A.; de Bruin, E.F.L.M.; Edwards, T.; Herman, P.M.J.; Laane, R.P.W.M.; Ledoux, L.; Lindeboom, H.; Lise, W.; Moncheva, S.; Moschella, P.S.; Stive, M.J.F.; Vermaar, J.E.

2005

Groundbased measurements by NILU during the FORMAT campaign 2002. NILU F

Vik, A.F.

2003

Ground-level measurements of relevant reactive gases in GAW, regional and national networks.

Tørseth, K.

2017

Ground-based Zenith-sky measurements of BrO and OClO above Andøya (69.3°N, 16.0°E) during the 1998/1999 THESEO winter campaign. NILU F

Tørnkvist, K.K.; Arlander, D.W..

1999

Ground-based Zenith-sky measurements of BrO and OClO above Andøya (69.3°N, 16.0°E) during the 1998/1999 THESEO winter campaign. Air pollution research report, 73

Tørnkvist, K.K.; Arlander, D.W.

2000

Ground-based validation of the Copernicus Sentinel-5P TROPOMI NO2 measurements with the NDACC ZSL-DOAS, MAX-DOAS and Pandonia global networks

Verhoelst, Tijl; Compernolle, Steven; Pinardi, Gaia; Lambert, Jean-Christopher; Eskes, Henk J.; Eichmann, Kai Uwe; Fjæraa, Ann Mari; Granville, José; Niemeijer, Sander; Cede, Alexander; Tiefengraber, Martin; Hendrick, François; Pazmino, Andrea; Bais, Alkiviadis; Bazureau, Ariane; Boersma, K. Folkert; Bognar, Kristof; Dehn, Angelika; Donner, Sebastian; Elokhov, Aleksandr; Gebetsberger, Manuel; Goutail, Florence; de la Mora, Michel Grutter; Gruzdev, Aleksandr; Gratsea, Myrto; Hansen, Georg H.; Irie, Hitoshi; Jepsen, Nis; Kanaya, Yugo; Karagkiozidis, Dimitris; Kivi, Rigel; Kreher, Karin; Levelt, Pieternel F.; Liu, Cheng; Muller, Moritz; Comas, Monica Navarro; Piters, Ankie J.M.; Pommereau, Jean-Pierre; Portafaix, Thierry; Prados-Roman, Cristina; Puentedura, Olga; Querel, Richard; Remmers, Julia; Richter, Andreas; Rimmer, John; Cárdenas, Claudia Rivera; de Miguel, Lidia Saavedra; Sinyakov, Valery P.; Stremme, Wolfgang; Strong, Kimberly; Van Roozendael, Michel; Veefkind, J. Pepijn; Wagner, Thomas; Wittrock, Folkard; Gonzalez, Margarita Yela; Zehner, Claus

This paper reports on consolidated ground-based validation results of the atmospheric NO2 data produced operationally since April 2018 by the TROPOspheric Monitoring Instrument (TROPOMI) on board of the ESA/EU Copernicus Sentinel-5 Precursor (S5P) satellite. Tropospheric, stratospheric, and total NO2 column data from S5P are compared to correlative measurements collected from, respectively, 19 Multi-Axis Differential Optical Absorption Spectroscopy (MAX-DOAS), 26 Network for the Detection of Atmospheric Composition Change (NDACC) Zenith-Scattered-Light DOAS (ZSL-DOAS), and 25 Pandonia Global Network (PGN)/Pandora instruments distributed globally. The validation methodology gives special care to minimizing mismatch errors due to imperfect spatio-temporal co-location of the satellite and correlative data, e.g. by using tailored observation operators to account for differences in smoothing and in sampling of atmospheric structures and variability and photochemical modelling to reduce diurnal cycle effects. Compared to the ground-based measurements, S5P data show, on average, (i) a negative bias for the tropospheric column data, of typically −23 % to −37 % in clean to slightly polluted conditions but reaching values as high as −51 % over highly polluted areas; (ii) a slight negative median difference for the stratospheric column data, of about −0.2 Pmolec cm−2, i.e. approx. −2 % in summer to −15 % in winter; and (iii) a bias ranging from zero to −50 % for the total column data, found to depend on the amplitude of the total NO2 column, with small to slightly positive bias values for columns below 6 Pmolec cm−2 and negative values above. The dispersion between S5P and correlative measurements contains mostly random components, which remain within mission requirements for the stratospheric column data (0.5 Pmolec cm−2) but exceed those for the tropospheric column data (0.7 Pmolec cm−2). While a part of the biases and dispersion may be due to representativeness differences such as different area averaging and measurement times, it is known that errors in the S5P tropospheric columns exist due to shortcomings in the (horizontally coarse) a priori profile representation in the TM5-MP chemical transport model used in the S5P retrieval and, to a lesser extent, to the treatment of cloud effects and aerosols. Although considerable differences (up to 2 Pmolec cm−2 and more) are observed at single ground-pixel level, the near-real-time (NRTI) and offline (OFFL) versions of the S5P NO2 operational data processor provide similar NO2 column values and validation results when globally averaged, with the NRTI values being on average 0.79 % larger than the OFFL values.

2021

Ground-based UV measurements of BrO and OC1O over Ny-Ålesund during winter 1996 and 1997 and Andøya during winter 1998/99.

Tørnkvist, K. K.; Arlander, D. W.; Sinnhuber, B.-M.

2002

Ground-based UV imaging cameras for industrial gas and particle measurements. Abstract.

Prata, F.; Shongwe, B.; Knudsen, S.

2008

Ground-based measurements of total ozone column amount with a multichannel moderate-bandwidth filter instrument at the Troll research station, Antarctica

Sztipanov, Milos; Tumeh, Lubna; Li, Wei; Svendby, Tove Marit; Kylling, Arve; Dahlback, Arne; Stamnes, Jakob J.; Hansen, Georg; Stamnes, Knut

2020

Ground-based assessment of the bias and long-term stability of 14 limb and occultation ozone profile data records.

Ground-based imaging cameras for volcanic gas and particle measurement. NILU PP

Prata, F.; Bluth, G.; Bernardo, C.

2008

Poster

Hubert, D.; Lambert, J.-C.; Verhoelst, T.; Granville, J.; Keppens, A.; Baray, J.-L.; Bourassa, A. E.; Cortesi, U.; Degenstein, D. A.; Froidevaux, L.; Godin-Beekmann, S.; Hoppel, K. W.; Johnson, B. J.; Kyrölä, E.; Leblanc, T.; Lichtenberg, G.; Marchand, M.; McElroy, C. T.; Murtagh, D.; Nakane, H.; Portafaix, T.; Querel, R.; Russell III, J. M.; Salvador, J.; Smit, H. G. J.; Stebel, K.; Steinbrecht, W.; Strawbridge, K. B.; Stübi, R.; Swart, D. P. J.; Taha, G.; Tarasick, D. W.; Thompson, A. M.; Urban, J.; van Gijsel, J. A. E.; Van Malderen, R.; von der Gathen, P.; Walker, K. A.; Wolfram, E.; Zawodny, J. M.

2016

Ground based perspective during the AROMAT 2015 campaign.

Belegante, L.; Vasilescu, J.; Nicolae, D.; Talianu, C.; Nemuc,A.; Radu, C.; Ajtai, N.; Merlaud, A.; Dekemper, E.; Stebel, K.

2016

Poster

Ground based FTIR measurements of stratospheric species from Harestua, Norway during SESAME and comparison with models.

Galle, B.; Mellqvist, J.; Arlander, D.W.; Fløisand, I.; Chipperfield, M.P.; Lee, A.M.

1999

Gridded global surface ozone metrics for atmospheric chemistry model evaluation.

Sofen, E.D.; Bowdalo, D.; Evans, M.J.; Apadula, F.; Bonasoni, P.; Cupeiro, M.; Ellul, R.; Galbally, I. E.; Girgzdiene, R.; Luppo, S.; Mimouni, M.; Nahas, A.C.; Saliba, M.; Tørseth, K.

2016

Grenseverdier for organiske miljøgifter i gjødselvarer - hvordan etablere det?

Eggen, Trine; Heimstad, Eldbjørg Sofie; Nikiforov, Vladimir; Vogelsang, Christian

2020