Publikasjoner

Monitoring of the atmospheric ozone layer and natural ultraviolet radiation. Annual report 2010. NILU OR

Myhre, C.L.; Svendby, T.M.; Stebel, K.; Edvardsen, K.; Johnsrud, M.; Dahlback, A.

Rapporten presenterer måledata for totalozon, vertikalfordelingen av ozon og UV-stråling over norske målestasjoner i 2010. For Oslo og Andøya er trenden i totalozon beregnet for perioden 1979-2010.
Ozonverdiene over Norge var generelt høye i 2010. Den klare reduksjonen av ozonlaget over Norge i perioden 1979-1997 stoppet opp i 1998 og ozonlaget over Norge ser nå ut til å ha stabilisert seg.

Monitoring of the atmospheric ozone layer and natural ultraviolet radiation. Annual report 2012. NILU OR

Svendby, T.M.; Edvardsen, K.; Myhre, C.L.; Stebel, K.; Orsolini, Y.; Dahlback, A.

Rapporten presenterer måledata for totalozon og UV-stråling over norske målestasjoner i 2012. For Oslo, Andøya og Ny-Ålesund er trenden i totalozon beregnet for perioden 1979-2012. Ozonverdiene over Norge var tilnærmet normale 2012, bortsett fra vinterverdiene i Oslo som var lavere enn normalt. Den klare reduksjonen av ozonlaget over Norge i perioden 1979-1997 stoppet opp i 1998 og ozonlaget over Norge ser nå ut til å ha stabilisert seg.

Monitoring of the atmospheric ozone layer and natural ultraviolet radiation. Annual report 2014. NILU OR

Svendby, T.M.; Edvardsen, K.; Hansen, G.H.; Stebel, K.; Dahlback, A.

Rapporten presenterer måledata for totalozon og UV-stråling over norske målestasjoner i 2014.
For Oslo, Andøya og Ny-Ålesund er trenden i totalozon beregnet for perioden 1979-2014.
Ozonlaget over Norge var relativt tynt våren 2014, men det tok seg opp i april/mai, og verdiene
var tilnærmet normale resten av året. Den klare reduksjonen av ozonlaget over Norge i perioden
1979-1997 stoppet opp i 1998, og ozonlaget over Norge ser nå ut til å ha stabilisert seg.

Monitoring of the atmospheric ozone layer and natural ultraviolet radiation. Annual report 2016. NILU report

Svendby, T.M.; Hansen, G.H.; Stebel, K.; Bäcklund, A.; Dahlback, A.

Denne rapporten presenterer resultatene fra det norske måleprogrammet for totalozon og UV-
stråling. Ozonlaget har blitt målt ved tre stasjoner siden 1979: i Oslo, Tromsø/Andøya og Ny-Ålesund. UV-målinger startet i 1995. Resultatene viser at det var en signifikant ozonreduksjon over Norge i perioden 1979 til 1997. Deretter stanset en videre reduksjon og ozonverdiene stabiliserte seg på et nivå ~2% lavere enn 1979-1989 middelet. Det er imidlertid store årlige fluktuasjoner, og i 2016 var det gjennomsnittlige ozonlaget relativt tynt, spesielt i februar og mars.

Monitoring of the atmospheric ozone layer and natural ultraviolet radiation. Annual Report 2019.

Svendby, Tove Marit; Hansen, Georg H.; Bäcklund, Are; Nilsen, Anne-Cathrine

Denne rapporten presenterer resultatene fra det norske måleprogrammet for totalozon og UV-stråling. Ozonlaget har blitt målt ved tre stasjoner siden 1979: i Oslo/Kjeller, Tromsø/Andøya og Ny-Ålesund. UV-målinger startet i 1995. Resultatene viser at det var en signifikant ozonreduksjon over Norge i perioden 1979 til 1997. Deretter stanset reduksjonen og ozonverdiene stabiliserte seg på et nivå ~2% lavere enn verdiene før 1980. Mest karakteristisk for 2019 var et tynt ozonlag i april 2019 og et «ozonhull» over Sør-Norge i desember 2019.

NILU

Monitoring of the atmospheric ozone layer and natural ultraviolet radiation. Annual report 2021.

Svendby, Tove Marit; Hansen, Georg H.; Bernet, Leonie; Bäcklund, Are; Nilsen, Anne-Cathrine; Schulze, Dorothea; Johnsen, Bjørn

This report summarizes the results from the Norwegian monitoring programme on stratospheric ozone and UV radiation measurements. The ozone layer has been measured at three locations since 1979: In Oslo/Kjeller, Tromsø/Andøya and Ny-Ålesund. The UV-measurements started in 1995. The results show that there was a significant decrease in stratospheric ozone above Norway between 1979 and 1997. After that, the ozone layer stabilized at a level ~2% below pre-1980 level. The year 2021 was characterized by low total ozone values in June and July, whereas “normal” ozone values were measured during winter and spring.

NILU

Monitoring of the atmospheric ozone layer and natural ultraviolet radiation. Annual Report 2023

Svendby, Tove Marit; Fjæraa, Ann Mari; Schulze, Dorothea; Bäcklund, Are; Johnsen, Bjørn

This report summarizes the results from the Norwegian monitoring programme on stratospheric ozone and UV radiation measurements. The ozone layer has been measured at three locations since 1979: In Oslo/Kjeller, Tromsø/Andøya and Ny-Ålesund. The UV measurements started in 1995. The results show that there was a significant decrease in stratospheric ozone above Norway between 1979 and 1997. After that, the ozone layer stabilized at a level ~2% below pre-1980 level. The year 2023 was characterized by low ozone values in winter, high spring values, and annual average total ozone values slightly below the long-term mean.

NILU

Monitoring of the SO2 emissions from Nyiragongo volcano using UV camera imaging and spectroscopy during 10 days in June 2017

Brenot, Hugues; Theys, Nicolas; Van Roozendael, Michel; Fayt, Caroline; Gliss, Jonas; Stebel, Kerstin; d'Oreye, Nicolas; Mapendo, Mathieu Yalire; Minani, Abel; Syauswa, Muhindo; Smets, Benoit; Kervyn, Francois

Monitoring Soil Moisture Drought over Northern High Latitudes from Space

Blyverket, Jostein; Hamer, Paul David; Schneider, Philipp; Albergel, Clement; Lahoz, William A.

Mapping drought from space using, e.g., surface soil moisture (SSM), has become viable in the last decade. However, state of the art SSM retrieval products suffer from very poor coverage over northern latitudes. In this study, we propose an innovative drought indicator with a wider spatial and temporal coverage than that obtained from satellite SSM retrievals. We evaluate passive microwave brightness temperature observations from the Soil Moisture and Ocean Salinity (SMOS) satellite as a surrogate drought metric, and introduce a Standardized Brightness Temperature Index (STBI). We compute the STBI by fitting a Gaussian distribution using monthly brightness temperature data from SMOS; the normal assumption is tested using the Shapior-Wilk test. Our results indicate that the assumption of normally distributed brightness temperature data is valid at the 0.05 significance level. The STBI is validated against drought indices from a land surface data assimilation system (LDAS-Monde), two satellite derived SSM indices, one from SMOS and one from the ESA CCI soil moisture project and a standardized precipitation index based on in situ data from the European Climate Assessment & Dataset (ECA&D) project. When comparing the temporal dynamics of the STBI to the LDAS-Monde drought index we find that it has equal correlation skill to that of the ESA CCI soil moisture product ( 0.71 ). However, in addition the STBI provides improved spatial coverage because no masking has been applied over regions with dense boreal forest. Finally, we evaluate the STBI in a case study of the 2018 Nordic drought. The STBI is found to provide improved spatial and temporal coverage when compared to the drought index created from satellite derived SSM over the Nordic region. Our results indicate that when compared to drought indices from precipitation data and a land data assimilation system, the STBI is qualitatively able to capture the 2018 drought onset, severity and spatial extent. We did see that the STBI was unable to detect the 2018 drought recovery for some areas in the Nordic countries. This false drought detection is likely linked to the recovery of vegetation after the drought, which causes an increase in the passive microwave brightness temperature, hence the STBI shows a dry anomaly instead of normal conditions, as seen for the other drought indices. We argue that the STBI could provide additional information for drought monitoring in regions where the SSM retrieval problem is not well defined. However, it then needs to be accompanied by a vegetation index to account for the recovery of the vegetation which could cause false drought detection.

MDPI

Monitoring surface blackening and zinc reaction products near Munch's The Source in the Aula at the University of Oslo (2013-2021). NILU F

Frøysaker, T.; Millani, C.; Grøntoft, T.; Kleiva, I.

Monitoring urban air quality using a high-density network of low-cost sensor nodes in Oslo, Norway.

Castell, N.; Schneider, P.; Vogt, M.; Dauge, F. R.; Lahoz, W.; Bartonova, A.

Monitoring, with emphasis on the chemical nature of plastics and macro- and microimpurities in the plastic - what was plastic litter made of and what does it consist of?

Nikiforov, V.