Found 9764 publications. Showing page 49 of 391:
Atmosfærisk nedfall av tungmetaller i Norge. Landsomfattende undersøkelse i 1995. Statlig program for forurensningsovervåking. Rapport 691/97. TA-1436/1997.
1997
2003
2016
Atmospheric composition in the European Arctic and 30 years of the Zeppelin Observatory, Ny-Ålesund
The Zeppelin Observatory (78.90∘ N, 11.88∘ E) is located on Zeppelin Mountain at 472 m a.s.l. on Spitsbergen, the largest island of the Svalbard archipelago. Established in 1989, the observatory is part of Ny-Ålesund Research Station and an important atmospheric measurement site, one of only a few in the high Arctic, and a part of several European and global monitoring programmes and research infrastructures, notably the European Monitoring and Evaluation Programme (EMEP); the Arctic Monitoring and Assessment Programme (AMAP); the Global Atmosphere Watch (GAW); the Aerosol, Clouds and Trace Gases Research Infrastructure (ACTRIS); the Advanced Global Atmospheric Gases Experiment (AGAGE) network; and the Integrated Carbon Observation System (ICOS). The observatory is jointly operated by the Norwegian Polar Institute (NPI), Stockholm University, and the Norwegian Institute for Air Research (NILU). Here we detail the establishment of the Zeppelin Observatory including historical measurements of atmospheric composition in the European Arctic leading to its construction. We present a history of the measurements at the observatory and review the current state of the European Arctic atmosphere, including results from trends in greenhouse gases, chlorofluorocarbons (CFCs) and hydrochlorofluorocarbons (HCFCs), other traces gases, persistent organic pollutants (POPs) and heavy metals, aerosols and Arctic haze, and atmospheric transport phenomena, and provide an outline of future research directions.
2022
Atmospheric composition in the European Arctic and 30 years of the Zeppelin Observatory, Ny-Ålesund,
2021
2014
2012
2016
Atmospheric corrosion due to amine emissions from carbon capture plants
The atmospheric corrosion due to pure amines emitted from carbon capture plants was investigated. Amine exposure was found to initially inhibit the corrosion of steel, by its film formation and alkalinity, but reduce corrosion product layers and lead to freezing point depression, which could in turn increase the corrosion. Very high amine doses were observed to dissolve the metal without the establishing of a corrosion layer. These effects seem much more pronounced on copper than on steel. Climate and air quality variations affect the steel corrosion much more than the expected maximum amine deposition from carbon capture plant emissions.
Elsevier
2021
2001
2002
Atmospheric Degradation of Amines (ADA). Amines in aerosol - A review. CLIMIT project no. 201604. NILU OR
This report presents a comprehensive review of current literature on the abundance of amines in atmospheric aerosols. The review spans over the whole life cycle of aerosols, showing the relevance of amine-related aerosol dynamic processes in each stage of the cycle. Amine compounds can constitute a siginificant fraction of submicron ambient aerosols, in particular in urban air and close to agricultural sources. It is evident from both field experiments and computational studies that amines have the propensity to contribute to new particle formation. Particulate phase oxidation of amines leads to the formation of potentially toxic products such as imines and nitrosamines. In general, there is a lack of information about the acute and chronic toxic effects of particulate amides and imines, and also the chemical mechanisms leading to their formation in aerosol particles are currently not fully understood.
2010
2012
The gas phase photo-oxidation of 2-aminoethanol (MEA, NH2CH2CH2OH) has been studied in a series of experiments at the European Photochemical Reactor, EUPHORE, in Valencia (Spain). The results show that the branching in the OH initiated H-abstraction reaction with NH2CH2CH2OH is: <10 % from -NH2, >80 % from –CH2–, and <10 % from –CH2OH. The major products in the photo-oxidation are formamide, NH2CHO, and formaldehyde, CH2O. Amino acetaldehyde, NH2CH2CHO, and/or 2-imino ethanol, HN=CHCH2OH, and 2-oxo acetamide, NH2C(O)CHO are formed as minor products. 2-(Nitroamino) ethanol,O2NNHCH2CH2OH, has been unambiguouslyidentified as a minor product in the MEA photo-oxidation. It is estimated that less than 3 ‰ of MEA emitted to the atmosphere will end up as the possibly carcinogenic nitramine in rural regions.
2010
The atmospheric gas phase photo-oxidation of methylamine (CH3NH2), dimethylamine ((CH3)2NH) and trimethylamine ((CH3)3N) has been studied under pseudo natural conditions at the European Photochemical Reactor, EUPHORE, in Valencia, Spain. Major products in the photo-oxidation were imines (methanimine and N-methyl-methanimine) and amides (formamide, N-methyl formamide and N,N-dimethyl formamide). Total aerosol yields obtained in EUPHORE experiments were between 8 and 14%. Mimicking conditions at Mongstad results in a steady-state nitrosamine concentration of less than 0.6 % of photo-oxidized dimethylamine and less than 1.1 % of photo-oxidized trimethylamine. For rural regions it is predicted that the formation yield of the corresponding nitramine in the atmospheric oxidation of CH3NH2, (CH3)2NH and (CH3)3N is less than 0.4 %, 2.5 % and 5 %, respectively. The major uncertainties in the current understanding of the fate of amines emitted to the atmosphere are related to night-time chemistry, to the chemistry of imines, and to chemistry in the aqueous aerosol.
2011