Publication Date:
2021-05-19
Description:
In this paper, the circulations driven by deep heating and shallow heating are investigated
through analytically solving a set of linear equations and examining circulations simulated by a
dry primitive equation model. Special emphasis is placed on the low-level mass (moisture)
convergence associated with the forced circulation and the maintenance of the shallow and deep
heat sources.
It is found that the forced circulation driven by shallow heating is more likely to be trapped
horizontally near the heating area but relatively extended in the vertical. As a consequence,
diabatic heating can not balance adiabatic cooling due to upward motion. At the levels slightly
above the top of the heating, a negative vertical gradient of temperature perturbation appears. For
the atmosphere driven by deep heating, however, the temperature perturbation cannot accumulate
because the heating signals propagate away very fast, allowing an approximate equilibrium
between the convective diabatic heating and adiabatic cooling due to upward motion.
The converged moisture associated with circulation driven by shallow heating exceeds the
amount needed to maintain the heat source. However, the circulation driven by deep heating does
not feed back effectively to the moisture convergence, and thus can not be self-sustaining.
Description:
Center for Ocean-Land-Atmosphere Studies - Calverton
Description:
Published
Keywords:
Atmospheric circulation
Repository Name:
AquaDocs
Type:
Journal Contribution
,
Refereed
,
Article
Format:
637515 bytes
Format:
application/pdf
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