Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Global climate modeling of Saturn's atmosphere. Part IV: stratospheric
  equatorial oscillation   The Composite InfraRed Spectrometer (CIRS) on board Cassini revealed an
equatorial oscillation of stratospheric temperature, reminiscent of the Earth's
Quasi-Biennial Oscillation (QBO), as well as anomalously high temperatures
under Saturn's rings. To better understand these predominant features of
Saturn's atmospheric circulation in the stratosphere, we have extended towards
higher altitudes the DYNAMICO-Saturn global climate model (GCM), already used
in a previous publication to study the tropospheric dynamics, jets formation
and planetary-scale waves activity. Firstly, we study the higher model top
impact on the tropospheric zonal jets and kinetic energy distribution. Raising
the model top prevents energy and enstrophy accumulation at tropopause levels.
The reference GCM simulation with 1/2$^{\circ}$ latitude/longitude resolution
and a raised model top exhibits a QBO-like oscillation produced by resolved
planetary-scale waves. However, the period is more irregular and the downward
propagation faster than observations. Furthermore, compared to the CIRS
observation retrievals, the modeled QBO-like oscillation underestimates by half
both the amplitude of temperature anomalies at the equator and the vertical
characteristic length of this equatorial oscillation. This QBO-like oscillation
is mainly driven by westward-propagating waves; a significant lack of eastward
wave-forcing explains a fluctuating eastward phase of the QBO-like oscillation.
At 20$^{\circ}$N and 20$^{\circ}$S latitudes, the DYNAMICO-Saturn GCM exhibits
several strong seasonal eastward jets, alternatively in the northern and
southern hemisphere. These jets are correlated with the rings' shadowing. Using
a GCM simulation without rings' shadowing, we show its impact on Saturn's
stratospheric dynamics. Both residual-mean circulation and eddy forcing are
impacted by rings' shadowing.

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The categories of this paper are: quant-ph
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The categories of this paper are: funct-an
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The categories of this paper are: alg-geom
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The categories of this paper are: cmp-lg
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The categories of this paper are: chem-ph
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The categories of this paper are: nucl-th
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The categories of this paper are: supr-con
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The categories of this paper are: gr-qc
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The categories of this paper are: acc-phys
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The categories of this paper are: q-bio
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The categories of this paper are: hep-ph
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The categories of this paper are: q-alg
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The categories of this paper are: econ
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The categories of this paper are: ao-sci
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The categories of this paper are: mtrl-th
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The categories of this paper are: hep-ex