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Redwood National Park Trends Analysis
The tables and figures below show the trends analysis results for 20% worst, middle 60% and 20% best days at REDW1 based on light extinction coefficient data from 1994 to 2003. No significant trend is found for total aerosol light extinction in 20% worst days. But significant decrease trends in sulfate and CM light extinction coefficients are found in 20% worst days. Significant decrease in total aerosol light extinction coefficients are found in both middle 60% and 20% best days.

Table 1. Number of valid measurements used in the trends analysis
Site Year StartDate EndDate NoMeas
REDW1 1994 1/1/1994 12/31/1994 96
REDW1 1995 1/4/1995 12/23/1995 95
REDW1 1996 1/24/1996 12/21/1996 88
REDW1 1997 1/18/1997 12/27/1997 90
REDW1 1998 1/14/1998 12/30/1998 95
REDW1 1999 1/2/1999 12/29/1999 93
REDW1 2000 1/1/2000 12/29/2000 96
REDW1 2001 1/1/2001 12/30/2001 105
REDW1 2002 1/11/2002 12/31/2002 100
REDW1 2003 1/9/2003 12/29/2003 108
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)
REDW1 1994 38.09 21.01 3.32 7.51 1.81 0.23 4.20
REDW1 1995 46.06 24.22 3.26 11.16 2.40 0.28 4.75
REDW1 1996 46.11 24.31 8.57 7.29 1.46 0.32 4.17
REDW1 1997 52.46 22.75 7.66 13.82 2.30 0.24 5.68
REDW1 1998 37.64 22.15 5.61 4.94 1.23 0.31 3.40
REDW1 1999 62.75 16.00 7.73 27.71 5.55 0.34 5.43
REDW1 2000 39.41 18.65 7.47 8.03 1.79 0.23 3.24
REDW1 2001 40.09 18.63 10.12 6.70 1.32 0.36 2.96
REDW1 2002 45.95 17.92 8.37 13.56 1.78 0.39 3.93
REDW1 2003 33.47 18.63 5.14 5.68 1.01 0.18 2.83
               
Slope (1/Mm/Year)   -0.111 -0.704 0.311 -0.117 -0.088 0.012 -0.160
S-Value   -5 -23 11 -5 -17 11 -23
P-Value   0.364 0.023 0.190 0.364 0.078 0.190 0.023

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)
REDW1 1994 21.46 9.25 3.19 4.02 1.07 0.13 3.80
REDW1 1995 22.56 10.81 3.25 3.38 0.99 0.16 3.97
REDW1 1996 20.53 10.86 2.86 3.52 0.78 0.17 2.34
REDW1 1997 20.94 10.57 2.94 3.30 0.62 0.13 3.38
REDW1 1998 17.43 8.19 2.59 3.06 0.65 0.16 2.79
REDW1 1999 18.80 9.44 2.87 2.75 0.83 0.13 2.76
REDW1 2000 20.42 8.68 3.39 4.24 1.21 0.15 2.75
REDW1 2001 18.05 9.67 2.91 2.61 0.67 0.25 1.94
REDW1 2002 22.05 11.02 3.22 4.29 0.95 0.18 2.39
REDW1 2003 17.35 8.72 2.29 3.44 0.79 0.11 2.00
               
Slope (1/Mm/Year)   -0.428 -0.096 -0.040 -0.064 -0.011 0.002 -0.200
S-Value   -19 -3 -7 -5 -3 3 -29
P-Value   0.054 0.431 0.300 0.364 0.431 0.431 0.005

Table 4. Trends analysis for 20% best 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)
REDW1 1994 10.62 2.67 3.18 1.75 0.77 0.05 2.21
REDW1 1995 10.73 2.85 3.16 1.62 0.77 0.05 2.29
REDW1 1996 7.44 2.48 1.99 1.35 0.27 0.06 1.28
REDW1 1997 8.12 2.70 1.03 1.98 0.53 0.06 1.83
REDW1 1998 6.57 2.26 0.72 1.16 0.46 0.07 1.91
REDW1 1999 8.07 3.12 0.80 1.60 0.61 0.07 1.88
REDW1 2000 6.90 2.59 0.85 1.34 0.52 0.05 1.55
REDW1 2001 6.05 2.49 0.79 1.46 0.48 0.04 0.78
REDW1 2002 5.90 2.53 0.61 1.22 0.39 0.04 1.10
REDW1 2003 5.21 1.98 0.52 1.36 0.34 0.03 0.98
               
Slope (1/Mm/Year)   -0.563 -0.052 -0.230 -0.047 -0.042 -0.002 -0.138
S-Value   -35 -15 -37 -17 -23 -13 -27
P-Value   0.000 0.108 0.000 0.078 0.023 0.146 0.008

Page last updated 30 March 2005