Particle Climatology in Central East China Retrieved from Measurements in Planetary Boundary Layer and in Free Troposphere at a 1500-m-High Mountaintop Site
2016
Particle numbersize distribution (PNSD) is an important variable for evaluating the effect of aerosols on climate. In this study, the PNSD in the size range of 3 nm–2.5 µm was measured over a 20-month period at Mt. Tai station, located at ~1500 m asl. in central east China (CEC). The mean
particle numberconcentrations in the nucleation (Nnuc, 3–25 nm), Aitken (NAit, 25–100 nm), accumulation modes (Nacc, 100–1000 nm) and in total measured particle size range were 3200 cm –3 , 5200 cm –3 , 3400 cm –3 , and 11800 cm –3 , respectively. New particle formation (NPF) events determined from the PNSD data occurred on 32% of measured days, with particle formation rate and growth rate of 4.0 ± 3.7 cm –3 s –1 and 6.1 ± 2.5 nm h –1 , respectively. Time periods of 12:00–17:00 and 23:00–7:00
local timewere selected to represent periods when the
air massat the station was dominated by
planetary boundary layer(PBL) and free troposphere (FT) air, respectively. The diurnal variation of
particle numberconcentration was influenced mostly by NPF events and evolution of the PBL. When NPF event days were excluded, the
particle numberconcentration also experienced a seasonal variation with maximum in summer and minimum in winter. This seasonality was influenced by seasonal variations in PBL evolution and by
air massadvection. The results of this study characterize the regional particle climatology in central east China in terms of
particle numberand size.
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