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Publications (4)9.83 Total impact

  • R. J. Allam, A. F. Tuck
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    ABSTRACT: Trajectories have been computed during a 10-day period in January for approximately zonal rings of parcels in the upper troposphere and lower stratosphere of a general circulation model. Time histories of ozone and water vapour highlight the central role of the subtropical jet streams as mixing agents for tropospheric and stratospheric air. There is some evidence of inertial oscillations in the upper tropical troposphere, particularly at longitudes where there is no large-scale convergence or divergence. The western tropical Pacific from about 150°E to 160°W appeared to be a centre of large-scale motion, with pronounced upper tropospheric descent below about 10 km and ascent at and above 16 km, apparently linked to large-scale ascent in the middle and high latitude stratosphere up to 30 km.
    Quarterly Journal of the Royal Meteorological Society 12/2006; 110(464):357 - 392. · 3.33 Impact Factor
  • R. J. Allam, A. F. Tuck
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    ABSTRACT: The fluxes of water vapour in the upper troposphere and lower stratosphere of a general circulation model have been calculated. Although the results are probably affected by some model characteristics, particularly the vertical resolution, they suggest that ingress of water vapour to the stratosphere may occur by large-scale eddy motions above the core of the subtropical jet stream, as well as by vertical motion through the tropical tropopause. The latter motion occurs predominantly in the equatorial western Pacific and Indian Ocean, and is connected with the monsoon circulation.
    Quarterly Journal of the Royal Meteorological Society 03/1984; 110(464):321 - 356. · 3.33 Impact Factor
  • R. J. Allam, A. F. Tuck
    07/1981;
  • R. J. Allam, K. S. Groves, A. F. Tuck
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    ABSTRACT: The variability of OH computed with a photochemical steady state model from general circulation model fields of ozone and water vapor is examined. Multivariate regression analysis is used to obtain values of parametric coefficients for the variables upon which the OH field principally depends, and conclusions are drawn about the longitudinal phase relations between these variables for various pressure levels. 21 references, 8 figures, 6 tables.
    Journal of Geophysical Research 01/1981; 86:5303-5320. · 3.17 Impact Factor