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Träfflista för sökning "hsv:(NATURVETENSKAP) hsv:(Geovetenskap och miljövetenskap) hsv:(Meteorologi och atmosfärforskning) srt2:(1985-1989)"

Sökning: hsv:(NATURVETENSKAP) hsv:(Geovetenskap och miljövetenskap) hsv:(Meteorologi och atmosfärforskning) > (1985-1989)

  • Resultat 1-10 av 16
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1.
  • Davis, J.L, et al. (författare)
  • Geodesy by radio interferometry: Effects of atmospheric modeling errors on estimates of baseline length
  • 1985
  • Ingår i: Radio Science. - 0048-6604 .- 1944-799X. ; 20:6, s. 1593-1607
  • Tidskriftsartikel (refereegranskat)abstract
    • Analysis of very long baseline interferometry data indicates that systematic errors in prior estimatesof baseline length, of order 5 cm for ~8000-km baselines, were due primarily to mismodeling of theelectrical path length of the troposphere and mesosphere ("atmospheric delay"). Here we discussobservational evidence for the existence of such errors in the previously used models for the atmosphericdelay and develop a new "mapping" function for the elevation angle dependence of this delay. Thedelay predicted by this new mapping function differs from ray trace results by less than ~5 mm, at allelevations down to 5° elevation, and introduces errors into the estimates of baseline length of •
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2.
  • Aronsson, Inga-Lill (författare)
  • Human Response to the Lightning Hazard in a Cultural Context
  • 1986
  • Rapport (övrigt vetenskapligt/konstnärligt)abstract
    • This paper explores the human responses to lightning hazards from a cultural anthropological perspective. By definition, a natural hazard involves human action, initiative, and choices. There is always an interaction between man and nature, because humans respond and adapt themselves to the natural phenomena. These adjustments and responses differ from one society to another. The author was, at the time of writing, affiliated to both the Institute of High Voltage Research, and, the Department of Cultural Anthropology, Uppsala University.
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3.
  • Berndtsson, Ronny (författare)
  • On the use of cross-correlation analysis in studies of patterns of rainfall variability
  • 1987
  • Ingår i: Journal of Hydrology. - : Elsevier BV. - 0022-1694. ; 93:1-2, s. 113-134
  • Tidskriftsartikel (refereegranskat)abstract
    • Cross-correlation structures based on daily rainfall data recorded during a period of 5 years at 67 stations throughout Tunisia are used to examine spatial rainfall variability. Basic properties of the correlation-distance function such as cumulating period, exclusion versus inclusion of dry periods, and data volume are analysed. Analysis of the correlation patterns for each month shows that two periods (February-May, and September-November) are delimited by a period of great instability (December-January) and by the dry period (June-August). Three main rainfall regions can be distinguished, delimited and governed mainly by the topography and the coastal influence.
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4.
  • Berndtsson, Ronny (författare)
  • Topographical and coastal influence on spatial precipitation patterns in Tunisia
  • 1989
  • Ingår i: International Journal of Climatology. - : Wiley. - 0899-8418 .- 1097-0088. ; 9:4, s. 357-369
  • Tidskriftsartikel (refereegranskat)abstract
    • The spatial properties of the correlation structure based on daily rainfall data from 67 stations throughout Tunisia over a 5‐year period are examined. The correlation structure is generally markedly anisotropic as influenced by topography and the coast. These two factors seem to influence the correlation pattern differently during different months. The mean areas within the 0.7 correlation isoline for all subgroups vary from about 1000 km2 in the early autumn to about 7000 km2 in the winter months.
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5.
  • Elgered, Gunnar, 1955, et al. (författare)
  • Water Vapour Radiometer Data Compared to VLBI Data
  • 1985
  • Ingår i: Proceedings of the 4th Working Meeting on European VLBI for Geodesy and Astrometry. ; , s. 37-38
  • Konferensbidrag (övrigt vetenskapligt/konstnärligt)
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6.
  • Hamrud, Mats, 1955- (författare)
  • Statistical properties of the atmosphere influencing long-range transport of air pollutants
  • 1985
  • Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
    • This thesis deals with some statistical properties of the atmosphere of importance for the transport and removal of air pollutants. Clouds and precipitation can strongly influence the behaviour of atmospheric pollutants. Thus, we need to know the frequency of occurrence of cloud and rain events in order to estimate e.g. removal times of pollutants. The frequency of cloud and rain passages should be estimated in a Lagrangian frame of reference, i.e. moving with the wind. As these estimates are difficult to obtain, estimates made at fixed points in space are often used instead. When comparing estimates of frequency of rain events obtained in a Lagrangian frame of reference with estimates obtained at fixed points no systematic difference was found.To estimate the residence time of atmospheric gases one normally needs to know the sources and sinks. An alternative approach is to use the information contained in the atmospheric variability of these gases. The estimate of the residence time obtained from the variability will have an uncertainty of at least a factor of 10 if the source and sink distribution is unknown. If we know the location of the sources the estimate will be much improved bringing the uncertainty down to perhaps a factor of two.
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10.
  • Ross, Howard B. (författare)
  • Trace metals in the atmosphere : the wet deposition of trace metals : the selenium cycle
  • 1986
  • Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
    • Cd, Cu, Fe, Mn, Pb and Zn concentrations in wet deposition have been monitored in Sweden since the autumn of 1983. Concentrations of these elements are highest in southern Sweden and decrease northward. Examination of enrichment factors, relative to crustal material, indicate that the major source of Cd, Cu, Pb and Zn is anthropogenic emissions. However, Cd and Zn anthropogenic emissions from Swedish sources are 2-5 times smaller than wet deposition fluxes. Therefore, to explain the relatively high temporal and spatial correlation of Cd, Pb and Zn concentrations, it is concluded that their wet deposition in Sweden is mainly governed by long range transport of pollutants from the rest of Europe. It is also postulated that Cd, Pb and Zn may be useful tracers for long range transport of sub-micron anthropogenic aerosols. Assessment of toxicity potentials (TP) indicate that Cu, Mn, and Zn monthly mean concentrations are not potentially toxic to freshwater and coniferous forest ecosystems. In contrast, Cd and Pb concentrations in southern Sweden can reach levels which are suspected to be deliterious to freshwater ecosystems.It is postulated that the relatively even distribution of selenium in the atmosphere is partly due to an internal cycle between selenium on particles and in the gas phase. Budget calculations for the region 30°N to 90°N indicate that anthropogenic emissions are 3-4 times larger than natural sources. In addition, it is suggested that terrestrial ecosystems may be an important source of atmospheric selenium.
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  • Resultat 1-10 av 16

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