  Further analysis has been made on the millimeter and submillimeter-wave
(100-1600 GHz or 3 mm - 188 micron) atmospheric opacity data taken with the
Fourier Transform Spectrometer (FTS) at Pampa la Bola, 4800 m above sea level
in northern Chile, which is the site of the Atacama Large
Millimeter/submillimeter Array (ALMA). Time-sequence plots of millimeter and
submillimeter-wave opacities show similar variations to each other, except for
during the periods with liquid water (fog or clouds) in the atmosphere. Using
millimeter and submillimeter-wave opacity correlations under two conditions,
which are affected and not affected by liquid water, we succeeded to separate
the measured opacity into water vapor and liquid water opacity components. The
water vapor opacity shows good correlation with the 183 GHz water vapor line
opacity, which is also covered in the measured spectra. On the other hand, the
liquid water opacity and the 183 GHz line opacity show no correlation. Since
only the water vapor component is expected to affect the phase of
interferometers significantly, and the submillimeter-wave opacity is less
affected by the liquid water component, it may be possible to use the
submillimeter-wave opacity for a phase-correction of submillimeter
interferometers.
