Multiyear Measurements of the Aerosol Absorption Coefficient Near the Surface in a Small-Sized Urban Area in Portugal

Table 1

Basic statistical properties of 𝜎_ap(670) organized for each month and season between 2007 and 2013. Q1 and Q3 indicate the quartiles; P1 and P99 indicate the 1st and 99th percentiles.

	Mean (Mm^−1)	SD (Mm^−1)	Q1 (Mm^−1)	Median (Mm^−1)	Q3 (Mm^−1)	P1 (Mm^−1)	P99 (Mm^−1)
Month
Jan.	12.9	13.6	4.8	8.6	15.7	0.7	73.6
Feb.	11.1	11.2	4.5	7.6	13.1	0.7	61.7
Mar.	8.4	8.5	3.9	6.2	9.8	0.7	47.5
Apr.	6.5	4.9	3.2	5.2	8.4	0.7	23.4
May.	6.6	4.9	3.5	5.4	8.4	0.9	25.1
Jun.	6.4	4.3	3.5	5.5	8.2	0.9	20.9
Jul.	5.6	4.7	3.0	4.6	6.8	0.8	22.4
Aug.	6.0	4.7	3.2	4.9	7.4	0.7	23.1
Sep.	8.1	6.2	4.2	6.5	10.0	1.2	31.2
Oct.	9.9	9.3	4.4	7.3	12.0	0.8	48.7
Nov.	11.1	11.8	4.5	7.6	13.2	0.7	65.1
Dec.	12.2	12.6	4.8	8.6	14.7	0.6	70.1
Season
Winter	12.2	12.6	4.8	8.3	14.6	0.6	70.0
Spring	7.2	6.4	3.5	5.6	8.8	0.7	31.5
Summer	6.1	4.6	3.2	5.0	7.6	0.8	22.2
Autumn	9.7	9.5	4.4	7.1	11.6	0.8	50.3