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Precipitable water vapor (PWV) is the amount of water vapor in the atmosphere. Since water vapor shows strong absorption in the infrared, PWV is an important parameter influencing the observation condition of TAO/MIMIZUKU. At the summit of Co. Chajnantor, the TAO observation site, PWV is expected to be 0.3-1.5 mm. Results of PWV investigations at the summit of Co. Chajnantor (including the CCAT site adjacent to the TAO site) are shown below.
Based on the studies described above, PWV is expected to be ~0.3, ~0.4, ~0.7, and ~1.2 mm at 10, 25, 50, and 75%-ile, respectively. The PWV of the TAO site is expected to be 50-70% of the APEX site (Konishi et al. 2015, Cortés et al. 2020).
