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Pinnacles Wilderness Area Trends Analysis
The tables and figures below show the trends analysis results for 20% worst, middle 60% and 20% best days at PINN1 based on light extinction coefficient data from 1994 to 2003. A significant increase trend in nitrate light extinction coefficients, and significant decrease trends in LAC and CM light extinction coefficients are found in 20% worst days. LAC and CM extinctions also decreased significantly in the middle 60% and 20% best days. Significant decrease in total aerosol light extinction coefficients is found in 20% best days.

Table 1. Number of valid measurements used in the trends analysis
Site Year StartDate EndDate NoMeas
PINN1 1994 1/1/1994 12/31/1994 95
PINN1 1995 1/4/1995 12/23/1995 97
PINN1 1996 1/3/1996 12/28/1996 97
PINN1 1997 1/4/1997 12/27/1997 92
PINN1 1998 1/3/1998 12/30/1998 58
PINN1 1999 1/2/1999 12/29/1999 95
PINN1 2000 1/1/2000 12/29/2000 100
PINN1 2001 1/1/2001 12/30/2001 104
PINN1 2002 1/2/2002 12/31/2002 117
PINN1 2003 1/3/2003 12/29/2003 119
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)
PINN1 1994 46.10 15.90 7.04 11.34 5.30 0.55 5.96
PINN1 1995 51.45 16.74 6.88 12.23 7.63 0.68 7.29
PINN1 1996 47.04 15.37 8.61 11.89 4.68 0.77 5.73
PINN1 1997 48.04 15.55 10.48 11.36 5.07 0.65 4.93
PINN1 1998 47.69 12.52 11.00 11.90 7.45 0.61 4.21
PINN1 1999 62.68 18.97 13.50 16.53 6.61 0.88 6.19
PINN1 2000 54.16 13.56 18.39 11.91 5.85 0.65 3.79
PINN1 2001 48.73 14.01 16.44 8.92 3.68 0.54 5.13
PINN1 2002 60.82 17.47 19.73 14.41 4.13 0.62 4.46
PINN1 2003 45.24 15.22 10.59 11.34 3.38 0.46 4.26
               
Slope (1/Mm/Year)   0.376 -0.076 1.509 0.005 -0.255 -0.017 -0.211
S-Value   9 -5 31 1 -21 -15 -21
P-Value   0.242 0.364 0.002 0.500 0.036 0.108 0.036

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)
PINN1 1994 29.97 9.15 7.06 5.86 2.88 0.33 4.69
PINN1 1995 33.21 10.81 6.91 6.79 3.71 0.40 4.60
PINN1 1996 29.50 8.64 5.83 6.74 3.65 0.40 4.24
PINN1 1997 28.78 8.49 6.47 6.10 3.08 0.48 4.17
PINN1 1998 29.64 9.29 5.90 7.54 2.94 0.37 3.59
PINN1 1999 32.00 8.96 8.14 6.89 3.33 0.43 4.25
PINN1 2000 32.67 10.67 7.85 6.69 3.21 0.39 3.86
PINN1 2001 29.26 9.94 6.41 5.48 2.62 0.59 4.22
PINN1 2002 30.14 10.44 6.05 6.75 2.55 0.46 3.90
PINN1 2003 25.80 8.12 6.06 5.67 2.32 0.31 3.31
               
Slope (1/Mm/Year)   -0.126 -0.027 -0.085 -0.021 -0.116 0.009 -0.101
S-Value   -9 -1 -7 -7 -25 7 -27
P-Value   0.242 0.500 0.300 0.300 0.014 0.300 0.008

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)
PINN1 1994 20.21 4.89 7.13 3.39 1.87 0.17 2.77
PINN1 1995 18.44 3.87 8.13 2.38 1.33 0.14 2.59
PINN1 1996 14.28 3.00 4.83 3.16 1.17 0.08 2.04
PINN1 1997 14.79 4.35 2.36 3.59 1.76 0.26 2.48
PINN1 1998 11.54 3.51 2.61 2.84 1.10 0.13 1.36
PINN1 1999 15.57 5.16 2.98 3.28 1.67 0.17 2.29
PINN1 2000 14.98 5.42 3.34 2.69 1.37 0.14 2.03
PINN1 2001 11.46 3.84 2.45 2.27 1.00 0.12 1.77
PINN1 2002 13.58 4.70 2.42 3.01 1.29 0.19 1.97
PINN1 2003 12.58 4.88 2.81 2.23 0.86 0.14 1.66
               
Slope (1/Mm/Year)   -0.719 0.112 -0.401 -0.115 -0.059 -0.001 -0.108
S-Value   -23 9 -19 -19 -23 -5 -29
P-Value   0.023 0.242 0.054 0.054 0.023 0.364 0.005

Page last updated 30 March 2005