The impact threshold of the aerosol radiative forcing on the boundary layer structure in the pollution region

Abstract. Recently, there has been increasing interest in the relation between particulate matter (PM) pollution and atmospheric-boundary-layer (ABL) structure. This study aimed to qualitatively assess interaction PM ABL structure essence further quantitatively estimate aerosol radiative forcing (ARF) effects on Multi-period comparative analysis indicated that key determining whether haze outbreak or dissipation occurs is satisfies relevant conditions. However, change was turn highly related level ARF. |SFC−ATM| (SFC ATM are ARFs at surface interior of atmospheric column, respectively) absolute difference ground atmosphere layer ARFs, linearly concentrations. influence ARF boundary nonlinear. With |SFC−ATM|, turbulence kinetic energy (TKE) exponentially decreased, which notable lower layers ABL, but disappeared high altitudes above ABL. Moreover, threshold determined for first time, namely once exceeded ∼55 W m−2, tends quickly stabilize thereafter little with The could provide useful information atmospheric-environment improvement measures policies, such as formulating phased air control objectives.