Shevchenko et al.: The Composition oUhe Coarse F mction otAerosols
55
pollens, diatoms) is the main component by mass, as has already been shown earlier
(Shevchenko et aI., 1995). Content of organic carbon varies from 7.54 to 26.9 % (Table 1)
(17.6 % in average, n=7 samples). A number of investigations carried out in the recent years
confirm that organic matter is one of the main components of the atmospheric aerosols (Aston et
aI., 1973; Isidorov, 1990; Matthias-Maser and Jaenicke, 1995).
Mineral particles also play an important role. The contents of different minerals vary
significantly from sample to sample (Table 1). In the mineral non-amorphous part of the coarse
fraction of aerosols in August-October 1993 the content of quartz ranged from 15 to 56 % (33
% in average), feldspars - from 4 to 20 % (in average 12 %), illite - from 12 to 38 % (in
average 23 %), chlorite plus caolinite - from 12 to 48 % (in average 31 %). High variability of
mineral composition can probably be explained by the different origin of the air masses.
In most samples small spherical particles (diameter from 1 to 10 /lm) presumably of
anthropogenic origin (fly ash) were detected. As it has been shown that these particles may be
Table I: Concentrations and composition of insoluble aerosol particles larger than I ~m in the marine boundary
layer over the Laptev, Kara and Barents Seas in summer. *DM49 - samples collected in 49-th cruise of RIV
Dmitry Mendeleev; ARK XIII- samples collected in expedition ARK XIII of PFS Polarstern.
Cone.,
Average
ChI.+
Samples*
mg/m3
size, ~m Corg. Si02 AI203 Quartz Feldsp.
Illite
KaoI.
DM49-4
DM49-5
DM49-6
DM49-7
DM49-8
DM49-9
DM49-10
DM49-11
DM49-12
DM49-13
DM49-14
DM49-15
DM49-16
DM49-17
DM49-18
DM49-19
DM49-20
DM49-21
DM49-22
DM49-23
ARKXI/l-I
ARKXI/l-2
0.26
0.06
0.66
0.20
0.14
0.48
0.06
0.03
0.18
0.15
0.05
0.03
0.21
0.21
0.06
0.18
0.05
0.03
0.02
0.05
0.09
0.09
4.59
4.58
5.39
5.23
5.54
4.42
5.00
4.35
4.21
4.85
4.18
4.46
4.76
4.68
6.15
4.90
4.76
4.86
4.35
% from total mass
7.5
19.0
26.9
15.4
9.4
20.0
25.1
56.6
34.3
16.2
29.5
51.4
31.0
13.9
14.0
9.5
3.5
6.5
13.0
6.2
3.8
38
17
36
27
35
56
23
34
23
36
22
46
43
36
48
30
15
37
31
% from mineral phase
8
8
13
8
17
16
8
12
4
II
7
16
14
20
18
7
20
7
12
27
38
15
22
18
16
34
22
25
24
28
16
16
22
12
20
29
28
24
25
36
35
42
26
12
34
31
48
28
43
22
26
22
22
41
35
28
32
55
pollens, diatoms) is the main component by mass, as has already been shown earlier
(Shevchenko et aI., 1995). Content of organic carbon varies from 7.54 to 26.9 % (Table 1)
(17.6 % in average, n=7 samples). A number of investigations carried out in the recent years
confirm that organic matter is one of the main components of the atmospheric aerosols (Aston et
aI., 1973; Isidorov, 1990; Matthias-Maser and Jaenicke, 1995).
Mineral particles also play an important role. The contents of different minerals vary
significantly from sample to sample (Table 1). In the mineral non-amorphous part of the coarse
fraction of aerosols in August-October 1993 the content of quartz ranged from 15 to 56 % (33
% in average), feldspars - from 4 to 20 % (in average 12 %), illite - from 12 to 38 % (in
average 23 %), chlorite plus caolinite - from 12 to 48 % (in average 31 %). High variability of
mineral composition can probably be explained by the different origin of the air masses.
In most samples small spherical particles (diameter from 1 to 10 /lm) presumably of
anthropogenic origin (fly ash) were detected. As it has been shown that these particles may be
Table I: Concentrations and composition of insoluble aerosol particles larger than I ~m in the marine boundary
layer over the Laptev, Kara and Barents Seas in summer. *DM49 - samples collected in 49-th cruise of RIV
Dmitry Mendeleev; ARK XIII- samples collected in expedition ARK XIII of PFS Polarstern.
Cone.,
Average
ChI.+
Samples*
mg/m3
size, ~m Corg. Si02 AI203 Quartz Feldsp.
Illite
KaoI.
DM49-4
DM49-5
DM49-6
DM49-7
DM49-8
DM49-9
DM49-10
DM49-11
DM49-12
DM49-13
DM49-14
DM49-15
DM49-16
DM49-17
DM49-18
DM49-19
DM49-20
DM49-21
DM49-22
DM49-23
ARKXI/l-I
ARKXI/l-2
0.26
0.06
0.66
0.20
0.14
0.48
0.06
0.03
0.18
0.15
0.05
0.03
0.21
0.21
0.06
0.18
0.05
0.03
0.02
0.05
0.09
0.09
4.59
4.58
5.39
5.23
5.54
4.42
5.00
4.35
4.21
4.85
4.18
4.46
4.76
4.68
6.15
4.90
4.76
4.86
4.35
% from total mass
7.5
19.0
26.9
15.4
9.4
20.0
25.1
56.6
34.3
16.2
29.5
51.4
31.0
13.9
14.0
9.5
3.5
6.5
13.0
6.2
3.8
38
17
36
27
35
56
23
34
23
36
22
46
43
36
48
30
15
37
31
% from mineral phase
8
8
13
8
17
16
8
12
4
II
7
16
14
20
18
7
20
7
12
27
38
15
22
18
16
34
22
25
24
28
16
16
22
12
20
29
28
24
25
36
35
42
26
12
34
31
48
28
43
22
26
22
22
41
35
28
32