Narrow C IV absorption doublets on quasar spectra of the Baryon
  Oscillation Spectroscopic Survey
  In this paper, we extend our works of Papers I and II, which are assigned to
systematically survey \CIVab\ narrow absorption lines (NALs) with
\zabs$\ll$\zem\ on quasar spectra of the Baryon Oscillation Spectroscopic
Survey (BOSS), to collect \CIV\ NALs with \zabs$\approx$\zem\ from blue to red
wings of \CIVwave\ emission lines. Together with Papers I and II, we have
collected a total number of 41,479 \CIV\ NALs with $1.4544\le$\zabs$\le4.9224$
in surveyed spectral region redward of \lya\ until red wing of \CIVwave\
emission line. We find that the stronger \CIV\ NALs tend to be the more
saturated absorptions, and associated systems (\zabs$\approx$\zem) seem to have
larger absorption strengths when compared to intervening ones (\zabs$\ll$\zem).
The redshift density evolution behavior of absorbers (the number of absorbers
per redshift path) is similar to the history of the cosmic star formation. When
compared to the quasar-frame velocity ($\beta$) distribution of \MgII\
absorbers, the $\beta$ distribution of \CIV\ absorbers is broader at
$\beta\approx0$, shows longer extended tail, and exhibits a larger dispersion
for environmental absorptions. In addition, for associated \CIV\ absorbers, we
find that low-luminosity quasars seem to exhibit smaller $\beta$ and stronger
absorptions when compared to high-luminosity quasars.
