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In this paper, we report on two C IV narrow absorption systems emerging fromthe spectrum of the quasar SDSS J095254.10 +021932.8, which are located at$z_{\rm abs}=2.0053$ and $z_{\rm abs}=1.8011$, respectively. These featureshave velocity offsets of $\rm \sim 13,800$ and $\rm \sim 34,700~km~s^{-1}$ withrespect to the quasar, and show obviously partial coverage to the backgroundemission sources. The two C IV absorption systems are imprinted on the spectrumobtained by the Sloan Digital Sky Survey (SDSS) III on 2011 March 25, whichcannot be observed from the spectrum obtained by SDSS-I/II on 2000 December 30.The time interval of the two SDSS observations is 1186.4 d at the quasar restframe. Because the continuum radiation, broad emission lines and mass accretionrate are stable for the two observations, together with the time interval ofobservations, we believe that the observed spectral variations are less likelyto be caused by the changes in the ionization states of the absorbing gas or bya new outflow, arising from the situation where there was previously no outflowat all. Instead, they probably arise from the motions of multiple streaming gasacross the sightline of the quasar.

Emergences of C IV narrow absorption troughs in the quasar SDSS J095254.10+021932.8