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  • 1
    Electronic Resource
    Electronic Resource
    On the specification of TGCM tidal lower boundary conditions from radar wind measurements during the June 1984 GTMS period
    Amsterdam : Elsevier
    Advances in Space Research 7 (1987), S. 295-298 
    Details
    ISSN: 0273-1177
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0273-1177(87)90104-9
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    A study of ozone mini-hole formation using a tracer advection model driven by barotropic dynamics (1997)
    Springer
    Meteorology and atmospheric physics 64 (1997), S. 107-121 
    Details
    ISSN: 1436-5065
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geography , Physics
    Notes: Summary An ozone mini-hole is a region of strongly depleted column total ozone amounts, associated with the growth of synoptic-scale wave disturbances. Their formation is illustrated here using a sequence of idealised model experiments. Simplified barotropic dynamics are used to drive an ozone tracer advection model on an f-plane representing a hemisphere. Firstly, the Contour Dynamics method is used to integrate the barotropic vorticity equation. Vorticity contours are initialised to simulate typical planetary wave structures and the developing wind field advects components of the ozone model. The vertical profiles of ozone mixing ratio are represented by simple linear functions, separated by a tropopause height field and capped by an upper model boundary. Integrating these profiles thus yields a total column ozone field which is closely dependent on tropopause height. In addition to horizontal advection, a vertical motion parametrisation is included, based on a quasi-geostrophic theory for tropopause displacement. The model is also used to simulate the formation of an actual mini-hole which occurred over northern Europe. Here, observed fields of vorticity, ozone and tropopause height are employed and the system integrated using a pseudo-spectral method. The mini-hole is successfully simulated, despite the simple model dynamics. The results demonstrate the correlation between column total ozone and the tropopause height and confirm the crucial role played by vertical air motions and by the meridional gradients of mid-stratospheric ozone mixing ratios for the formation of ozone mini-holes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01044132
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    The mid-latitude horizontal and vertical structure of the zonally asymmetric intraseasonal and interannual ozone variability in boreal winters (1998)
    Springer
    Climate dynamics 14 (1998), S. 891-904 
    Details
    ISSN: 1432-0894
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract  A singular value decomposition (SVD) is used to calculate SVD-selected fields of ozone and geopotential, which exhibit maximum covariance, from the observed zonally asymmetric total ozone field and that of the three-dimensional geopotential field thus leaving almost purely dynamical induced variations in the remaining ozone field. This procedure was applied to Total Ozone Mapping Spectrometer data (TOMS) and to geopotential values from the National Centers for Environmental Prediction in the boreal mid-latitudes in the winter months of 1979–1992. Intraseasonal variability (December–February) and trend-eliminated interannual winter mean variability of total ozone and geopotential are analyzed. The first four modes of SVD analysis explain more than 70% of the covariance for the intraseasonal variability and more than 80% of that for the interannual variability. The vertical structure of geopotential regression maps reveals a clear wave-1 pattern for modes one and two and a wave-2 pattern for modes three and four. These patterns show differently but generally westward tilted phases and are more complex at heights below 70 hPa. Further a linear transport model of a conservative tracer was applied to each individual geopotential mode found by the SVD analysis in connection with an observed height and latitude dependent zonal mean ozone distribution. The model results of total ozone reproduce the spatial patterns of the SVD-selected total ozone field quite well whereas their magnitudes are variously underestimated. This method allows us to assess the vertical distribution of the contribution of single modes to the total ozone variability. Maximum contributions are found between 150 and 70 hPa. Smaller amplitude maxima are found around 10 hPa, which result from contributions of horizontal advection of ozone alone. These results reflect an expected dynamical link between the variability of the zonally asymmetric parts of geopotential and ozone.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003820050263
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    Paper (German National Licenses)
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