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Träfflista för sökning "hsv:(NATURVETENSKAP) hsv:(Geovetenskap och miljövetenskap) hsv:(Meteorologi och atmosfärforskning) srt2:(1995-1999)"

Sökning: hsv:(NATURVETENSKAP) hsv:(Geovetenskap och miljövetenskap) hsv:(Meteorologi och atmosfärforskning) > (1995-1999)

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  • Elgered, Gunnar, 1955, et al. (författare)
  • Measuring regional atmospheric water vapor using the Swedish permanent GPS network
  • 1997
  • Ingår i: Geophysical Research Letters. - 1944-8007 .- 0094-8276. ; 24:21, s. 2663-2666
  • Tidskriftsartikel (refereegranskat)abstract
    • We investigate the application of a geodetic network of ground-based GPS receivers in Sweden to the measurement of atmospheric water vapor. Using data acquired during four days in December 1993, we show that it is possible to study the detailed motions of air mass systems. Estimates of water vapor from GPS data agree with those from radiosonde and microwave radiometer data to within 1 mm RMS.
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5.
  • Elgered, Gunnar, 1955, et al. (författare)
  • Ground-based microwave radiometry and long-term observations of atmospheric water vapor
  • 1998
  • Ingår i: Radio Science. - 0048-6604 .- 1944-799X. ; 33:3, s. 707-717
  • Tidskriftsartikel (refereegranskat)abstract
    • Microwave radiometer data and radiosonde data from the time period 1981-1995 have been used to study long-term trends in the integrated precipitable water vapor (IPWV). The two instruments have operated 37 km apart on the Swedish west coast. Model parameters are estimated for the entire data sets as well as for subsets of the data. The IPWV model parameters are a mean value, a linear drift with time, and the amplitude and phase of an annual component. The radiosonde data, which are uniformly sampled in time, show an increase in the IPWV of 0.03 mm/yr with a statistical standard deviation of 0.01 mm. The microwave radiometer data, which are not at all uniformly sampled in time, show -0.02+/-0.01 mm/yr. We show that the disagreement is caused by the different sampling of the data for the two instruments. When the two data sets are reduced to include only data that are sampled simultaneously, we find an agreement between all estimated model parameters, given their statistical uncertainties. This suggests that if the microwave radiometer had also been operating continuously over the 15-year period, its data would have implied a linear trend similar to the result obtained from the radiosonde data. The general quality of the data, in terms of the short time scatter, has been improved over the time period. The root mean square (RMS) difference between the IPWV measured by the radiometer and by the radiosondes was 2.1 mm during the first 5 years and was reduced to 1.6 mm during the last 4 years. These values include the real difference in the IPWV between the two sites. The bias, radiometer-radiosonde, was 0.1 mm for the whole data set and varied between -0.2 and 0.9 mm for smaller data sets of a few years.
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6.
  • Xiao, Zifan, et al. (författare)
  • Influence of humic substances on photolysis of divalent mercury in aqeous solution
  • 1995
  • Ingår i: Water Air and Soil Poll. - 0049-6979 .- 1573-2932. ; 80:1-4
  • Tidskriftsartikel (refereegranskat)abstract
    • Mercury (II) solutions were irradiated by a simulated sunlight in the presence of humic acid (HA) or fulvic acid (FA). Results show that, under the experimental conditions and the FA and HA chosen, less than 20% of the Hg in solution was photolysed with a rate of (1.63±0.29)×10–2 s–1 (n=23) and the rest of (2.38±0.40)×10–4 s–1 (n=23) depending on the substitutes of humic substances to which Hg were bond. The sunlight photolysis lifetimes were estimated to be 4 and 250 sunlight hours respectively under summer conditions at Stockholm latitude.
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7.
  • Frech, M, et al. (författare)
  • Regional surface fluxes over the NOPEX area
  • 1998
  • Ingår i: JOURNAL OF HYDROLOGY. - : ELSEVIER SCIENCE BV. - 0022-1694. ; 213:1-4, s. 155-171
  • Tidskriftsartikel (refereegranskat)abstract
    • The regional surface fluxes of sensible heat and moisture are estimated for two days during NOPEX '94 by means of aircraft measurements. A box flight pattern is analysed for 13 June (a weak wind case) and 14 June (a strong wind case), both with cold air
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9.
  • Halldin, S, et al. (författare)
  • Continuous long-term measurements of soil-plant-atmosphere variables at an agricultural site
  • 1999
  • Ingår i: AGRICULTURAL AND FOREST METEOROLOGY. - : ELSEVIER SCIENCE BV. - 0168-1923. ; 98-9, s. 75-102
  • Tidskriftsartikel (refereegranskat)abstract
    • It is a major challenge in modem science to decrease the uncertainty in predictions of global climate change. One of the largest uncertainties in present-day global climate models resides with the understanding of processes in the soil-vegetation-atmosphe
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10.
  • Halldin, S, et al. (författare)
  • NOPEX - a northern hemisphere climate processes land surface experiment
  • 1998
  • Ingår i: JOURNAL OF HYDROLOGY. - : ELSEVIER SCIENCE BV. - 0022-1694. ; 213:1-4, s. 172-187
  • Tidskriftsartikel (refereegranskat)abstract
    • The interface between land surfaces and the atmosphere is a key area in climate research, where lack of basic knowledge prevents us from reducing the considerable uncertainties about predicted changes. Boreal forests play an important, but not well known,
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