Table 1. Values of c 1, c 2 and c 3 (eq. 1) for each interval of AOD440 nm
Fig. 1
Comparison of SW measurements and estimations by eq. (1) and Table 1. Solid line is the linear fit and dashed line is the 1:1 line.
Table 2. Statistical estimators in the validation of SWcloud−free model [eq. (1) and Table 1]
Table 3. CRFSW (NCRFSW), CARFSW (NCARFSW) and ARFSW (NARFSW) 1-min statistics at 30° and 60° of SZA: average (ave), standard deviation (SD), first quartile (q1), median (md) and third quartile (q3)
Fig. 2
Evolution of the average values for CRFSW (a, with triangles), CARFSW (a, with diamonds), ARFSW (a, with circles), NCRFSW (b, with triangles), NCARFSW (b, with diamonds), and NARFSW (b, with circles) as a function of solar zenith angle.
Fig. 3
CRFSW as a function of SCV at 30° (line with circles) and 60° (line with triangles) of solar zenith angle. Vertical bars are the standard deviation of each interval (see text).
Fig. 4
CRFSW as a function of SCV-Sun at SZA = 60°. Different symbols are the different values of the hemispheric SCV. The grey dotted line is the CRFSW=0 case.
Fig. 5
Evolution of SW radiation measurements and cloud-free estimations.
Fig. 6
Evolution of CRFSW, SCV and SCV-Sun for the case study analysed in this study on 3 April 2007. Vertical dashed lines point out four positions that correspond with the sky photo shown in Fig. 7. Horizontal dashed line in the upper panel points out CRFSW=0.
Fig. 7
Sky photo for the four positions highlighted in Fig. 6: (1) at 12:10 h, (2) at 12:20 h, (3) at 13:05 h and (4) at 13:40 h UTC on 3 April 2007.