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We used the Atacama Large Millimeter/Submillimeter Array (ALMA) to map theCO(3-2) and [CI](1-0) lines, as well as their underlying continuum emission,from the central $\sim 200$ pc region of the Circinus galaxy that hosts thenearest type 2 Seyfert-class active galactic nucleus (AGN), with a spatialresolution of $\sim 6-15$ pc. The lines and continuum-emitting regions consistof a circumnuclear disk (CND; 74 pc $\times$ 34 pc) and spiral arms. Thedistribution of the continuum emission revealed a temperature-dependent dustgeometry and possibly polar dust elongation in the torus region. The molecularmass of the CND is $M_{\rm H2} \sim 3 \times 10^6~M_\odot$ with a beam-averagedH$_2$ column density of $\sim 5 \times 10^{23}$ cm$^{-2}$ toward the AGNposition, which contributes significantly to the nuclear obscuration. The[CI](1-0)/CO(3-2) ratio at the AGN position is unusually high, suggesting anX-ray dominated region-type chemistry. We decomposed the observed velocityfields into rotational and dispersion components, and revealed multi-phasedynamic nature in the $r \lesssim 10$ pc torus region, i.e., the diffuse atomicgas is more spatially extended along the vertical direction of the disk thanthe dense molecular gas. Through comparisons with our model predictions basedon the radiation-driven fountain scheme, we indicate that atomic outflows arethe driver of the geometrical thickness of the atomic disk. This supports thevalidity of the radiation-driven fountain scheme in the vicinity of this AGN,which would explain the long-lasting mystery, the physical origin of the AGNtorus.

Circumnuclear Multi-phase Gas in the Circinus Galaxy II: The Molecular and Atomic Obscuring Structures Revealed with ALMA