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

Table 5

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 stable atmospheric stability cases 𝐿>0 (including quasi-neutral cases).

Stable and neutral conditions (𝐿>0)
PM2.5		Vd (mm/s)	Flux (𝜇g/m^2s)	Conc. (𝜇g/m^3)	Vd/𝑢^∗
Venice	Average	2.42	−0.028	29.9	0.0096
	Std. dev.	5.43	0.048	27.8	0.0157
	Median	0.64	−0.012	22.0	0.0037
	25th quartile	0.26	−0.027	8.7	0.0015
	75th quartile	1.99	−0.004	41.6	0.0102
Lecce 2005	Average	2.79	−0.015	9.4	0.0105
	Std. dev.	4.83	0.024	6.2	0.0121
	Median	1.04	−0.008	8.5	0.0056
	25th quartile	0.34	−0.019	4.3	0.0022
	75th quartile	2.90	−0.003	13.8	0.0122
Maglie	Average	4.15	−0.034	13.3	0.0075
	Std. dev.	4.55	0.034	15.3	0.0095
	Median	2.55	−0.023	7.9	0.0055
	25th quartile	0.83	−0.051	5.5	0.0025
	75th quartile	5.72	−0.007	13.5	0.0094
PNC		Vd (mm/s)	Flux (#/cm^2s)	Conc. (#/cm^3)	Vd/𝑢^∗
Antarctica	Average	1.32	−86.5	1062.4	0.0091
	Std. dev.	1.70	90.2	916.6	0.0102
	Median	0.75	−56.5	753.8	0.0059
	25th quartile	0.33	−119.1	398.5	0.0028
	75th quartile	1.63	−22.7	1538.9	0.0116
Bologna	Average	1.43	−1872.9	13067.3	0.0134
	Std. dev.	1.95	2920.5	5688.3	0.0251
	Median	0.79	−951.2	12365.6	0.0059
	25th quartile	0.32	−2090.0	9051.0	0.0027
	75th quartile	1.72	−388.7	16199.3	0.0125
Lecce 2010	Average	1.27	−1030.9	7002.6	0.0073
	Std. dev.	1.28	1420.4	1935.5	0.0084
	Median	0.89	−594.8	6877.1	0.0038
	25th quartile	0.54	−923.9	5912.9	0.0020
	75th quartile	1.56	−278.3	7469.7	0.0086