Fant 9759 publikasjoner. Viser side 195 av 391:
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A climatology of frozen-in anticyclones in the spring arctic stratosphere over the period 1960-2011.
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Contribution of agriculture to air quality problems in cities and in rural areas in Europe. ETC/ACM Technical Paper, 2013/10
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For retrieval of ash mass loading from infrared satellite measurements, estimates of the ash cloud temperature and the surface temperature are required. The ash cloud temperature and surface temperature may be taken from satellite measurements, weather model forecast, or deduced by satellite retrievals.
The report describes various methods to estimate the ash cloud temperatue and surface temperature. The impact of varying cloud temperature and surface temperature on the signal measured by an IR-sensor in space is investigated.
2013
Monitoring of greenhouse gases and aerosols at Svalbard and Birkenes: Annual report 2011. NILU OR
Rapporten presenterer aktiviteter og måleresultater fra klimagassovervåkingen ved Zeppelin observatoriet på Svalbard for årene 2001-2011 og klimagassmålinger og klimarelevant partikkelmålinger fra Birkenes for 2009-2011. Overvåkingsprogramet utføres av NILU - Norsk institutt for luftforskning og er finansiert av Statens forurensningstilsyn (SFT) (nå Klima- og forurensningsdirektoratet (Klif)) og NILU - Norsk institutt for luftforskning.
2013
Monitoring of the atmospheric ozone layer and natural ultraviolet radiation. Annual report 2012. NILU OR
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.
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Prioritization, screening and identification of organosilicon contaminants in the environment. NILU F
A mass balance model of chemical fate and bioaccumulation in the environment was used to rank 287 high- and low-production volume organosilicon compounds for their concentration in the environment and in top predators. Key physical chemical properties of each chemical were estimated using quantitative structure-activity relationships (QSARs) and a total emission estimate of each chemical was made using information, which included amounts entering commerce and emission factors. Based on the model predicted concentrations in air, sediment and human tissue, chemicals were selected for screening through environmental sampling and analysis. Known environmental organosilicon contaminants such as the cyclic and linear volatile methyl siloxanes (VMS) were excluded as well as structures subject to rapid hydrolysis, a feature which was not taken into account in the model simulations because of current limitations in predicting hydrolysis half-lives with QSARs. Analytical standards were only commercially available for half of the remaining 30 organosilicon compounds. Ten of these were not stable in solution, which left 5 organosilicon compounds eligible for environmental screening. These were tetrakis(trimethylsilyloxy)silane, phenyl-tris(trimethylsiloxy)silane, trifluoropropyltrimethylcyclotrisiloxane, trifluoropropylmethylcyclotetrasiloxane and tetraphenyltrisiloxane. Four of these chemicals were identified in sewage sludge, in sediment from Stockholm harbor, and in Stockholm ambient air samples. The trifluoropropyl-substituted siloxanes were analysed with UPLC-MS/MS, the others with GC-MS. Trifluoropropyltrimethylcyclotrisiloxane was solely detected as its corresponding linear diol. To date it is unclear whether the diol is present in the environment as such or formed during extraction or cleanup. The concentrations of the chemicals ranged from pg m-3 in air up to ng g-1 d.w. in sewage sludge, which are orders of magnitude below the levels of cyclic VMS (such as D5) in the same matrices.
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Pharmaceuticals and additives in personal care products as environmental pollutants - Faroe Island, Iceland and Greenland. TemaNord, 2013:541
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Metaller ved Xstrata. Vurdering av målt konsentrasjonsnivå. NILU OR
NILU har gjennomgått måleresultater og analyseresultater fra måleserie av tungmetaller ved Xstrata, Kristiansand. Det er gjennomført en enkel betraktning av spredning av forurensning for værsituasjoner der målestasjonen kan belastes med utslipp fra Xstrata, og de målte konsentrasjonene er tilbakeregnet til utslipp. Beregningene viser at det ikke er noe misforhold mellom rapportert utslipp og målt konsentrasjon.
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