|
Lassen Volcanic National Park
Trends Analysis |
|
| The tables and figures below
show the trends analysis
results for 20% worst, middle 60% and 20% best days at LAVO1 based on
light extinction coefficient
data from 1994 to 2003. Overall, there is no significant trend in
aerosol light extinction in 20% worst days. A peak in OMC and LAC extinction
is observed in 1999, No significant trend is found for the middle 60% days,
and a decrease trend is found for 20% best days. |
|
|
| Table 1. Number of valid
measurements used in the trends analysis |
|
|
Site |
Year |
StartDate |
EndDate |
NoMeas |
|
LAVO1 |
1994 |
1/1/1994 |
12/31/1994 |
87 |
|
LAVO1 |
1995 |
1/21/1995 |
12/9/1995 |
78 |
|
LAVO1 |
1996 |
1/10/1996 |
12/25/1996 |
82 |
|
LAVO1 |
1997 |
1/4/1997 |
12/31/1997 |
89 |
|
LAVO1 |
1998 |
1/3/1998 |
12/30/1998 |
80 |
|
LAVO1 |
1999 |
1/13/1999 |
12/29/1999 |
86 |
|
LAVO1 |
2000 |
1/1/2000 |
12/26/2000 |
101 |
|
LAVO1 |
2001 |
1/4/2001 |
12/30/2001 |
112 |
|
LAVO1 |
2002 |
1/2/2002 |
12/31/2002 |
105 |
|
LAVO1 |
2003 |
1/3/2003 |
12/26/2003 |
118 |
|
|
| 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) |
|
LAVO1 |
1994 |
27.31 |
8.53 |
1.09 |
10.98 |
3.27 |
1.15 |
2.30 |
|
LAVO1 |
1995 |
24.36 |
8.35 |
1.16 |
9.04 |
3.25 |
0.82 |
1.74 |
|
LAVO1 |
1996 |
24.06 |
7.92 |
1.72 |
8.99 |
3.03 |
0.75 |
1.65 |
|
LAVO1 |
1997 |
22.51 |
6.57 |
1.77 |
7.99 |
2.52 |
0.65 |
3.01 |
|
LAVO1 |
1998 |
36.55 |
8.16 |
2.16 |
16.71 |
5.72 |
1.20 |
2.60 |
|
LAVO1 |
1999 |
67.37 |
7.80 |
4.04 |
37.69 |
13.29 |
0.93 |
3.62 |
|
LAVO1 |
2000 |
25.78 |
7.24 |
3.37 |
9.25 |
3.25 |
0.62 |
2.05 |
|
LAVO1 |
2001 |
30.77 |
8.56 |
4.75 |
10.91 |
2.93 |
1.46 |
2.16 |
|
LAVO1 |
2002 |
35.60 |
7.63 |
3.90 |
16.37 |
3.02 |
1.42 |
3.26 |
|
LAVO1 |
2003 |
29.85 |
7.44 |
3.79 |
13.55 |
3.12 |
0.64 |
1.33 |
|
|
|
|
|
|
|
|
|
|
|
Slope (1/Mm/Year) |
|
0.828 |
-0.103 |
0.356 |
0.422 |
-0.017 |
-0.002 |
0.050 |
|
S-Value |
|
11 |
-15 |
33 |
11 |
-7 |
-1 |
1 |
|
P-Value |
|
0.190 |
0.108 |
0.001 |
0.190 |
0.300 |
0.500 |
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) |
|
LAVO1 |
1994 |
13.23 |
3.79 |
1.22 |
4.42 |
1.48 |
0.57 |
1.75 |
|
LAVO1 |
1995 |
13.08 |
4.26 |
1.24 |
4.25 |
1.68 |
0.51 |
1.14 |
|
LAVO1 |
1996 |
11.52 |
3.33 |
1.07 |
4.06 |
1.34 |
0.37 |
1.34 |
|
LAVO1 |
1997 |
11.06 |
3.77 |
1.15 |
3.55 |
1.19 |
0.31 |
1.09 |
|
LAVO1 |
1998 |
15.38 |
4.46 |
0.92 |
6.20 |
1.87 |
0.30 |
1.64 |
|
LAVO1 |
1999 |
13.93 |
3.87 |
1.25 |
5.05 |
1.72 |
0.40 |
1.64 |
|
LAVO1 |
2000 |
13.36 |
4.17 |
1.18 |
4.91 |
1.61 |
0.37 |
1.13 |
|
LAVO1 |
2001 |
12.43 |
4.75 |
1.24 |
3.54 |
1.22 |
0.58 |
1.10 |
|
LAVO1 |
2002 |
12.74 |
3.81 |
1.49 |
4.19 |
1.27 |
0.64 |
1.34 |
|
LAVO1 |
2003 |
11.21 |
3.46 |
1.27 | |
