6 Sea Spray Elements (Na, Cl, Mg, Ca, K, Br, I)
81
Table 6.1 The regression analysis of Cl (mol) versus Na (mol)
The 1st transect
The 2nd transect
The 3rd transect
The regression equation:
Cl (mol) = 2.97 + 1.33 Na
(mol)
S = 7.1, R-sq = 0.32
The regression equation:
C l (mol) = 5.136 + 0.499 Na
(mol)
S = 4.3, R-sq = 0.05
The regression equation:
Cl (mol) = 1.14 +0.79 Na
(mol)
S = 2.6, R-sq = 0.07
45
40
35
30
25
20
15
10
5
1
500
400
300
200
100
0
MAPE
112.7
MAD
75.6
MSD
10652.2
Accuracy Measures
n
Cl/Br
Actual
Fits
Variable
Spatial Analysis Plot for Cl/Br
Linear Trend Model
Cl/Br = 134 - 0.58×n
Fig. 6.4 Spatial analysis plot of Cl/Br ratios
probably indicate very strong effects of the additional factors such as human activity,
geogenic dust or geographic position of sampling sites (Table 6.1).
Cl/Br ratio (297) is another important sea spray indicator which can be used as a
tracer of sea spray atmosphere only in the low contents of organic matter where they
are free from the reaction with the aquifer matrix (Klassen et al. 2014). The Cl/Br
ratio in current moss samples (Fig. 6.4) ranged from 13.3 to 509.5. The values lower
than 297 may indicate the decreased contribution of sea-salt aerosol as the distance
from the coastal line is increased and as an increasing contribution of tropospheric
aerosol, and/or the effect of weather condition on wet or dry deposition (Short et al.
2017). The values higher than 297, beside the effect of sea spray aerosol, may also
indicate the anthropogenic sources like sewage effluents or the pesticides application
in agriculture activity (Alcala and Custodio 2008). The Cl/Br values higher than 297
were found in coastal areas (St. 8, 10 and 11) and in the inland area (St. 23 and
32). Lower Cl/Br values are probably linked with the use of Br-based pesticides,
the distance from the coastal areas and the weather conditions relating wet and dry
deposition (Alcala and Custodio 2008).
The effect of the distance of sampling sites from the coastal areas is clearly showed
by spatial analysis of the Cl/Br molar ratio data (Fig. 6.4). The linear trend model
81
Table 6.1 The regression analysis of Cl (mol) versus Na (mol)
The 1st transect
The 2nd transect
The 3rd transect
The regression equation:
Cl (mol) = 2.97 + 1.33 Na
(mol)
S = 7.1, R-sq = 0.32
The regression equation:
C l (mol) = 5.136 + 0.499 Na
(mol)
S = 4.3, R-sq = 0.05
The regression equation:
Cl (mol) = 1.14 +0.79 Na
(mol)
S = 2.6, R-sq = 0.07
45
40
35
30
25
20
15
10
5
1
500
400
300
200
100
0
MAPE
112.7
MAD
75.6
MSD
10652.2
Accuracy Measures
n
Cl/Br
Actual
Fits
Variable
Spatial Analysis Plot for Cl/Br
Linear Trend Model
Cl/Br = 134 - 0.58×n
Fig. 6.4 Spatial analysis plot of Cl/Br ratios
probably indicate very strong effects of the additional factors such as human activity,
geogenic dust or geographic position of sampling sites (Table 6.1).
Cl/Br ratio (297) is another important sea spray indicator which can be used as a
tracer of sea spray atmosphere only in the low contents of organic matter where they
are free from the reaction with the aquifer matrix (Klassen et al. 2014). The Cl/Br
ratio in current moss samples (Fig. 6.4) ranged from 13.3 to 509.5. The values lower
than 297 may indicate the decreased contribution of sea-salt aerosol as the distance
from the coastal line is increased and as an increasing contribution of tropospheric
aerosol, and/or the effect of weather condition on wet or dry deposition (Short et al.
2017). The values higher than 297, beside the effect of sea spray aerosol, may also
indicate the anthropogenic sources like sewage effluents or the pesticides application
in agriculture activity (Alcala and Custodio 2008). The Cl/Br values higher than 297
were found in coastal areas (St. 8, 10 and 11) and in the inland area (St. 23 and
32). Lower Cl/Br values are probably linked with the use of Br-based pesticides,
the distance from the coastal areas and the weather conditions relating wet and dry
deposition (Alcala and Custodio 2008).
The effect of the distance of sampling sites from the coastal areas is clearly showed
by spatial analysis of the Cl/Br molar ratio data (Fig. 6.4). The linear trend model