Correlation of Dry Deposition Velocity and Friction Velocity over Different Surfaces for PM2.5 and Particle Number Concentrations

Table 4

Average (with standard deviation) and median (with 25th and 75th quartiles) values are reported for deposition velocities, fluxes, concentrations, and normalized deposition velocities for each site, separating PM2.5 from particle number data. In this table data is selected for unstable atmospheric stability cases 𝐿<0 (including quasi-neutral cases).

Unstable and neutral conditions (𝐿<0)
PM2.5		Vd (mm/s)	Flux (𝜇g/m^2s)	Conc. (𝜇g/m^3)	Vd/𝑢^∗
Venice	Average	3.15	−0.050	23.6	0.0118
	Std. dev.	4.04	0.072	23.2	0.0152
	Median	1.60	−0.023	16.9	0.0059
	25th quartile	0.57	−0.059	8.5	0.0023
	75th quartile	3.93	−0.009	30.0	0.0144
Lecce 2005	Average	5.10	−0.040	10.6	0.0102
	Std. dev.	6.61	0.054	5.8	0.0132
	Median	2.83	−0.026	10.3	0.0053
	25th quartile	1.31	−0.048	6.2	0.0027
	75th quartile	6.07	−0.013	14.7	0.0123
Maglie	Average	3.77	−0.039	14.3	0.0075
	Std. dev.	3.45	0.035	12.1	0.0075
	Median	2.32	−0.025	12.5	0.0054
	25th quartile	1.22	−0.061	7.4	0.0019
	75th quartile	5.67	−0.011	15.8	0.0098
PNC		Vd (mm/s)	Flux (#/cm^2s)	Conc. (#/cm^3)	Vd/𝑢^∗
Antarctica	Average	0.73	−97.4	1762.7	0.0108
	Std. dev.	0.83	118.4	1182.5	0.0122
	Median	0.41	−57.3	1593	0.0078
	25th quartile	0.20	−111.1	815.7	0.0031
	75th quartile	0.83	−27.3	1958.6	0.0128
Bologna	Average	2.41	−2883.7	11992.1	0.0111
	Std. dev.	2.86	3842.4	5889.4	0.0130
	Median	1.57	−1690	11059.2	0.0070
	25th quartile	0.61	−3787.0	7501.3	0.0028
	75th quartile	3.15	−530	14783.4	0.0143
Lecce 2010	Average	6.17	−10502.5	12672.3	0.0127
	Std. dev.	5.81	19241.5	11169.5	0.0114
	Median	4.60	−3886.2	7382.4	0.0095
	25th quartile	1.88	−9008.2	5385.1	0.0043
	75th quartile	8.27	−1420.3	17209.7	0.0178