|
Glacier National Park
Trends Analysis |
|
| The tables and figures below
show the trends analysis
results for 20% worst, middle 60% and 20% best days at GLAC1 based on
light extinction coefficient
data from 1994 to 2003. Overall, there is a significant increase trend in
aerosol light extinction in 20% worst days, which is caused mainly by
increase in nitrate light extinction. No significant trend is found for
aerosol light extinction coefficients in middle 60% days, and a significant decrease
trend is observed for the 20% best days caused by sulfate and CM. |
|
|
| Table 1. Number of valid
measurements used in the trends analysis |
|
|
Site |
Year |
StartDate |
EndDate |
NoMeas |
|
GLAC1 |
1994 |
1/5/1994 |
12/31/1994 |
96 |
|
GLAC1 |
1995 |
1/4/1995 |
12/30/1995 |
97 |
|
GLAC1 |
1996 |
1/3/1996 |
12/28/1996 |
100 |
|
GLAC1 |
1997 |
1/1/1997 |
12/31/1997 |
100 |
|
GLAC1 |
1998 |
1/3/1998 |
12/30/1998 |
95 |
|
GLAC1 |
1999 |
1/2/1999 |
12/29/1999 |
100 |
|
GLAC1 |
2000 |
1/1/2000 |
12/29/2000 |
99 |
|
GLAC1 |
2001 |
1/1/2001 |
12/30/2001 |
100 |
|
GLAC1 |
2002 |
1/5/2002 |
12/31/2002 |
96 |
|
GLAC1 |
2003 |
1/3/2003 |
12/29/2003 |
101 |
|
|
| Table 2. Trends analysis for
20% worst visibility days |
|
|
Site |
Year |
Bep (1/Mm) |
Sulfate_Ext (1/Mm) |
Nitrate_Ext (1/Mm) |
OMC_Ext (1/Mm) |
LAC_Ext (1/Mm) |
Soil_Ext (1/Mm) |
CM_Ext (1/Mm) |
|
GLAC1 |
1994 |
56.05 |
12.82 |
1.92 |
25.82 |
8.28 |
0.99 |
6.22 |
|
GLAC1 |
1995 |
48.15 |
11.77 |
1.89 |
19.43 |
7.24 |
0.96 |
6.85 |
|
GLAC1 |
1996 |
48.63 |
18.11 |
3.11 |
17.85 |
6.21 |
0.51 |
2.83 |
|
GLAC1 |
1997 |
47.30 |
16.42 |
5.65 |
14.62 |
5.20 |
0.59 |
4.80 |
|
GLAC1 |
1998 |
60.62 |
12.66 |
3.87 |
24.24 |
6.73 |
1.87 |
11.25 |
|
GLAC1 |
1999 |
59.20 |
12.57 |
3.26 |
19.93 |
5.86 |
2.34 |
15.25 |
|
GLAC1 |
2000 |
66.51 |
14.30 |
10.17 |
25.89 |
7.13 |
1.87 |
7.15 |
|
GLAC1 |
2001 |
66.30 |
11.34 |
9.06 |
31.44 |
7.71 |
1.56 |
5.18 |
|
GLAC1 |
2002 |
55.75 |
17.16 |
8.63 |
20.15 |
5.58 |
1.37 |
2.86 |
|
GLAC1 |
2003 |
66.80 |
13.85 |
10.39 |
27.99 |
6.40 |
1.42 |
6.75 |
|
|
|
|
|
|
|
|
|
|
|
Slope (1/Mm/Year) |
|
1.690 |
-0.039 |
0.963 |
0.750 |
-0.105 |
0.058 |
0.005 |
|
S-Value |
|
21 |
-1 |
31 |
17 |
-9 |
11 |
1 |
|
P-Value |
|
0.036 |
0.500 |
0.002 |
0.078 |
0.242 |
0.190 |
0.500 |
|
 |
|
| Table 3. Trends analysis for
middle 60% visibility days |
|
|
Site |
Year |
Bep (1/Mm) |
Sulfate_Ext (1/Mm) |
Nitrate_Ext (1/Mm) |
OMC_Ext (1/Mm) |
LAC_Ext (1/Mm) |
Soil_Ext (1/Mm) |
CM_Ext (1/Mm) |
|
GLAC1 |
1994 |
29.19 |
8.34 |
1.89 |
10.81 |
4.18 |
0.63 |
3.34 |
|
GLAC1 |
1995 |
24.77 |
9.05 |
1.87 |
7.04 |
3.73 |
0.41 |
2.66 |
|
GLAC1 |
1996 |
27.51 |
8.82 |
2.09 |
9.12 |
3.45 |
0.53 |
3.50 |
|
GLAC1 |
1997 |
25.05 |
8.29 |
1.70 |
8.16 |
3.12 |
0.43 |
3.35 |
|
GLAC1 |
1998 |
28.03 |
8.86 |
1.72 |
9.36 |
3.45 |
0.61 |
4.03 |
|
GLAC1 |
1999 |
24.62 |
6.65 |
1.41 |
8.73 |
3.50 |
0.53 |
3.80 |
|
GLAC1 |
2000 |
27.12 |
7.84 |
2.26 |
9.33 |
3.58 |
0.51 |
3.59 |
|
GLAC1 |
2001 |
24.91 |
7.88 |
2.49 |
8.06 |
3.04 |
0.68 |
2.76 |
|
GLAC1 |
2002 |
23.19 |
8.25 |
2.06 |
7.17 |
2.68 |
0.73 |
2.30 |
|
GLAC1 |
2003 |
25.62 |
7.24 |
< | |
