Do Absorbing Aerosols or Scattering Aerosols Dominate the Impact of
Aerosols on Ozone via Influencing Photolysis Rates?
Abstract
Since different optical properties, absorbing aerosols (AA) and
scattering aerosols (SA) impact ozone differently via influencing
photolysis rates. Notably, studies on the impact of SA have not reached
a consistent conclusion, leading to disconfirmation regarding which type
of aerosol dominates the impact of aerosols on ozone via influencing
photolysis rates. Our results show that, in contrast to the decreasing
impact of AA on ozone, SA decrease ozone chemical contribution (CHEM)
near surface but increase that aloft, subsequently enhancing the
vertical exchange of ozone and resulting the counteraction of the
opposite vertical changes in CHEM. Consequently, ozone changed slightly,
indicating that AA are the dominant aerosols. Reducing AA leads to ozone
increase nonlinearly (ΔO3). More than 86% of North
China Plain could be covered by ΔO3 when reducing more
than 3/4 of AA. More attention should be paid on the balance between
ozone and AA in determining synergetic control strategy.