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We present an ACA search for [CI] emission at 492GHz toward large T Tauridisks (gas radii $\gtrsim 200$au) in the $\sim 1-3$Myr-old Lupus star-formingregion. Combined with ALMA 12-m archival data for IM Lup, we report [CI]detections in 6 out of 10 sources, thus doubling the known detections toward TTauri disks. We also identify four Keplerian double-peaked profiles anddemonstrate that [CI] fluxes correlate with $^{13}$CO, C$^{18}$O, and$^{12}$CO(2-1) fluxes, as well as with the gas disk outer radius measured fromthe latter transition. These findings are in line with the expectation thatatomic carbon traces the disk surface. In addition, we compare the carbon andCO line luminosities of the Lupus and literature sample with [CI] detectionswith predictions from the self-consistent disk thermo-chemical models of Ruaudet al. (2022). These models adopt ISM carbon and oxygen elemental abundances asinput parameters. With the exception of the disk around Sz 98, we find thatthese models reproduce all available line luminosities and upper limits withgas masses comparable to or higher than the minimum mass solar nebula andgas-to-dust mass ratios $\geq 10$. Thus, we conclude that the majority of largeMyr-old disks conform to the simple expectation that they are not significantlydepleted in gas, CO, or carbon.

Large Myr-old Disks are Not Severely Depleted of gas-phase CO or carbon