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  • 1995-1999  (95)
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  • 1
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    Distribution of dimethylsulfide in the boundary layer at Spitsbergen (1997)
    In:  EPIC3Atmospheric Research in Ny-Ålesund, Proc Third NySMAC Meeting (I Floisand, H Gernandt, E Stoltz-Larsen, F Stordahl, M Wada, eds ) NILU Report OR 19/97, pp. 169-172
    Details
    Publication Date: 2019-07-17
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , peerRev
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  • 2
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    Peroxyactyl nitrate (PAN) distribution over the South Atlantic Ocean (1999)
    In:  EPIC3Physical chemistry chemical physics, 1, pp. 5517-5521
    Details
    Publication Date: 2019-07-17
    Description: The atmospheric concentration of peroxyacetyl nitrate (PAN) was measured over the South Atlantic Ocean in the range between 37° and 70° S inMarch 1999 in order to investigate its latitudinal distribution and its role in the NOy chemistry of the remote marine boundary layer (MBL) in the high latitudes of thesouthern hemisphere. The measurements were performed using an automatic gas chromatographic system aboard RV Polarstern. Mean mixing ratios of 62 (+/- 21)pptv were obtained between 37° and 49° S. South of 55° S, PAN concentrations were very low with values of the order of 10-30 pptv.Pronounced diurnal cycles could not be observed. The concentrations over the South Atlantic were considerably lower compared with the North Atlantic where theMBL is influenced by continental air masses.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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  • 3
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    Measurements of heavy metals and ions in precipitation at Spitsbergen (1997)
    In:  EPIC3Proceedings from the 3rd NySMAC meeting, NILU OR 19/97, ISBN: 82-425-0866-6
    Details
    Publication Date: 2019-07-17
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , peerRev
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  • 4
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    FTIR-Studies of the reaction of O(1D)-atoms with CF3Br in solid argon matrices (1995)
    In:  EPIC3Journal of Molecular Structure, 349, pp. 333-336
    Details
    Publication Date: 2019-07-17
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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  • 5
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    FTIR-spectroscopic studies of polar stratospheric cloud model surfaces characterization of nitric acid hydrates and heterogeneous reactions involving N2O5 and HBr (1995)
    In:  EPIC3Journal of molecular structure, 348, pp. 449-452
    Details
    Publication Date: 2019-07-17
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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  • 6
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    Ozonmessungen in Ny-Aalesund (1995)
    In:  EPIC3AGF-Forschungsthemen, 8, pp. 31-32
    Details
    Publication Date: 2019-07-17
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , notRev
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  • 7
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    Variability of formaldehyde in the Antarctic troposphere (1999)
    In:  EPIC3Physical Chemistry Chemical Physics, 1, pp. 5523-5527
    Details
    Publication Date: 2019-12-03
    Description: The annual cycle of formaldehyde (HCHO) has been measured at a remote site in Antarctica in order to investigate seasonal and diurnal variations as well as chemical processes in the troposphere. The measurements have been performed in 1997 (March 1997 to January 1998) and in February 1999 at the German Antarctic research station Neumayer which is located at 70°39'S, 8°15'W. The obtained time series for formaldehyde in near-surface air clearly indicates the occurrence of diurnal and seasonal variations in Antarctica. It was found that HCHO concentrations vary from values below the detection limit (0.03 ppbv) to maximum values of 0.4 ppbv in winter and 0.7 ppbv in the austral summer. The observed concentrations show daily variations on certain days with maximums in early afternoon and minima during the night. It has been found that HCHO mixing ratios are significantly higher than so far predicted by photochemical models.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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  • 8
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    Vertical ozone distribution in the marine atmsophere over the central Atlantic Ocean (56 S - 50 N) (1996)
    In:  EPIC3Journal of Geophysical ResearchD1, 101, pp. 1387-1399
    Details
    Publication Date: 2019-07-16
    Description: Abstract. The vertical ozone distribution over the Atlantic Ocean has been measured in situ by shipborne ozone soundings during three RV Polarstern meridional transects in January/February 1993, October/November 1993, and May/June 1994. The low ozone column densities measured by Nimbus 7 and Meteor 3 satellites in 1993 could be confirmed by our investigations. We observed distinct differences in the vertical distribution pattern of tropospheric ozone between the northern and the southern hemisphere: The ozone mixing ratio gradients were flat in the northern hemisphere and ozone mixing ratios in the free troposphere never did exceed 80 parts per billion by volume (ppbv) up to the tropopause, while the southern hemisphere exhibited a pronounced vertical gradient. Extremely dry air masses with enhanced ozone amounts up to 120 ppbv have been found in the tropical free troposphere of the southern hemisphere between 0° and 20°S. The vertical ozone stratification in the troposphere of the southern hemisphere was dominated by this large-scale feature. Photochemical ozone production as a consequence of the emissions of natural fires or intrusions of stratospheric air masses are the most probable sources for these ozone-rich layers. On the basis of our results, a stringent differentiation between both alternatives could not be given.
    Repository Name: EPIC Alfred Wegener Institut
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  • 9
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    Photooxidants in the marine Arctic troposphere in summer (1996)
    In:  EPIC3Journal of Geophysical ResearchD4, 101, pp. 9139-9147
    Details
    Publication Date: 2019-07-17
    Description: Abstract.The air chemistry investigations, performed on R/V Polarstern during the expedition ARK X/1 in July/August 1994, comprised a mapping of the vertical ozone distribution by ozone soundings and the surface mixing ratios of H2O2 and NO above the East Greenland Sea between 70°N and 80°N. The observed H2O2 mixing ratios varied from about 100 parts per trillion by volume (pptv) up to around 1000 pptv. Surface ozone concentrations can be correlated with the source region of the advected air masses. Ozone mixing ratios from around 33 parts per billion by volume (ppbv) up to 60 ppbv have been observed in air parcels emanating from industrialized regions. In contrast, pristine Arctic air masses showed low ozone mixing ratios of about 23 ppbv. The tropospheric part of the vertical ozone profiles occasionally exhibited significant maxima above the planetary boundary layer. Apart from cases where intrusions of stratospheric ozone were obvious, photochemical ozone formation along trajectories originating from polluted regions was most probably the reason for layers with enhanced ozone concentrations. The measured surface NO mixing ratios were extremely low, typically between 3 and 8 pptv. Thus local photochemical surface ozone production could be largely ruled out. In conclusion it can be stated that in summer, intrusion of ozone rich stratospheric air and advection of polluted air masses from lower latitudes appeared to be the dominant ozone sources of the marine Arctic troposphere.
    Repository Name: EPIC Alfred Wegener Institut
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  • 10
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    Tropospheric ozone depletion and related aerosol chemistry at polar regions (1998)
    In:  EPIC3EGS-Abstracts Nice 1998
    Details
    Publication Date: 2019-07-17
    Repository Name: EPIC Alfred Wegener Institut
    Type: Conference , notRev
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