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Aspects of the atmospheric energy budget over South-east Australia

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Hart, T. L. (Terence Leo) (1981) Aspects of the atmospheric energy budget over South-east Australia. Research Master thesis, University of Tasmania.

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Abstract

This study presents measurements of the atmospheric energy
fluxes over south-east Australia and discusses the role of these fluxes
and their divergence in the regional scale atmospheric energy budget.
Monthly averages of quasi-horizontal energy fluxes were
calculated from daily observations at six upper air stations for the
period 1974-1976. The relative contributions of the mean and eddy fluxes
were considered.
Energy flux divergences were computed for four months of 1975
and compared with independent estimates derived from (a) satellite
radiant flux data (in the case of the overall energy flux divergence),
and (b) a regional moisture budget (for the latent energy term). Adjustments
of the raw wind data to ensure mass balance were found to be necessary and
objective techniques for this purpose are discussed. Although exact balance
of the energy budget was not obtained, the contribution of the different
energy types (enthalpy, potential, latent, kinetic) consistently showed
counteraction among the various terms and between their mean and eddy
resolutions. For each of the four months considered, the total energy
flux divergence showed zonal convergence and meridional divergence.
Vertical profiles of the energy flux divergence are also presented.
The net radiant flux density at the top of the atmosphere,
closely related to the atmospheric energy flux divergence over the
region, showed small interannual variations. Analysis of the short and
long wave satellite radiation data showed that these variations, due
mainly to changes in cloudiness, were dominated by the fluctuations in
the short wave term.
The relation between the surface synoptic weather pattern
and atmospheric energy transport was investigated by correlating the
monthly average mean and eddy fluxes with the frequency of different wind directions and isobaric curvatures. Useful relations were found except
for the zonal eddy flux. The meridional fluxes were most closely related
to the frequency of northerly surface winds over the region.
The study incorporates a review of the global scale earth-atmosphere
energy budget and also of other regional scale investigations.
Some differences between results for south-east Australia and the zonal
average are noted.

Item Type: Thesis (Research Master)
Keywords: Energy budget (Geophysics)
Copyright Holders: The Author
Copyright Information:

Copyright 1981 the Author - The University is continuing to endeavour to trace the copyright
owner(s) and in the meantime this item has been reproduced here in good faith. We
would be pleased to hear from the copyright owner(s).

Additional Information:

Thesis (M.Sc.)--University of Tasmania, 1982. Bibliography

Date Deposited: 08 Dec 2014 23:54
Last Modified: 11 Mar 2016 05:56
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