Influence of Regional Transport Mechanisms on the Fingerprint of Biomass-Burning Aerosols in Buenos Aires

Table 1

Basic statistical parameters for AOD500nm and AE_440-870nm based on daily data.

Group 1 all data 2001–2005	All (a)	BB (b)	No BB (c)	a & b; t; p	a & c; t; p	b & c; t; p
AOD mean	0.128	0.168	0.109	3.70; <0.001	2.83; 0.005	5.86; <0.001
AOD sd	0.144	0.209	0.095
AE mean	1.243	1.287	1.223	1.68; 0.09	1.01; 0.31	2.33; 0.02
AE sd	0.385	0.382	0.385
N	915	288	627
Group 2 selected days (+)	All (a)	BB (b)	No BB (c)	a & b; t; p	a & c; t; p	b & c; t; p
AOD mean	0.360	0.549	0.182	2.98; 0.004	3.57; < 0.001	6.69; < 0.001
AOD sd	0.288	0.312	0.071
AE mean	1.566	1.638	1.498	1.57; 0.12	1.44; 0.15	2.68; 0.009
AE sd	0.222	0.195	0.227
n	68	33	35
AOD				1a & 2a; t; p	1c & 2c; t; p	1a & 2c; t; p
				11.69; <0.001	9.34; <0.001	4.43; <0.001
AE				6.82; <0.001	5.18; <0.001	4.18; <0.001

For each group and parameter, the first column presents the results for the whole data set (all) and the second and third columns correspond to the biomass-burning season (BB) and no-burning period (no BB) for each subgroup. The t and p values are the statistical variables of the t-test. Statistically significant differences (95% confidence level) between groups are highlighted in bold.