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Mount Rainer Wilderness Area Trends Analysis
The tables and figures below show the trends analysis results for 20% worst, middle 60% and 20% best days at MORA1 based on light extinction coefficient data from 1994 to 2003. Significant decrease trends in aerosol light extinction coefficients are found in 20% worst, middle 60% and 20% best days. Significant decreases are found for light extinction coefficients of OMC, LAC and CM  in 20% worst days, light extinction coefficients of sulfate, OMC, LAC and CM in middle 60% days, as well as light extinction coefficients of nitrate, OMC and CM in 20% best days. Significant increase in nitrate light extinctions is found in 20% worst days.

Table 1. Number of valid measurements used in the trends analysis
Site Year StartDate EndDate NoMeas
MORA1 1994 1/1/1994 12/31/1994 98
MORA1 1995 1/4/1995 12/30/1995 96
MORA1 1996 1/3/1996 12/28/1996 89
MORA1 1997 1/1/1997 12/31/1997 100
MORA1 1998 1/3/1998 12/30/1998 87
MORA1 1999 1/2/1999 12/29/1999 92
MORA1 2000 1/1/2000 12/29/2000 102
MORA1 2001 1/1/2001 12/30/2001 115
MORA1 2002 1/2/2002 12/31/2002 112
MORA1 2003 1/3/2003 12/29/2003 102
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)
MORA1 1994 66.19 36.72 2.10 17.07 6.63 0.45 3.22
MORA1 1995 55.19 29.51 2.13 14.36 6.07 0.38 2.74
MORA1 1996 58.53 25.65 4.29 18.53 7.56 0.47 2.03
MORA1 1997 57.88 29.84 4.87 15.09 5.13 0.41 2.54
MORA1 1998 66.83 35.93 5.99 14.98 6.56 0.91 2.46
MORA1 1999 64.34 34.91 2.96 17.69 6.34 0.43 2.01
MORA1 2000 54.01 27.06 5.91 12.91 5.97 0.29 1.86
MORA1 2001 52.11 30.46 4.38 10.33 4.49 0.45 2.01
MORA1 2002 47.19 20.90 5.57 13.16 4.99 0.57 1.99
MORA1 2003 49.19 22.13 4.97 12.44 4.60 0.53 4.51
               
Slope (1/Mm/Year)   -1.459 -1.021 0.325 -0.514 -0.297 0.009 -0.100
S-Value   -25 -17 21 -23 -27 9 -19
P-Value   0.014 0.078 0.036 0.023 0.008 0.242 0.054

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)
MORA1 1994 31.38 14.65 2.34 8.51 3.42 0.19 2.27
MORA1 1995 25.05 11.51 2.34 6.33 2.94 0.19 1.74
MORA1 1996 28.56 14.14 2.42 7.29 3.00 0.20 1.52
MORA1 1997 25.73 11.92 1.79 7.30 2.55 0.18 2.00
MORA1 1998 29.06 13.81 2.27 7.67 3.09 0.20 2.02
MORA1 1999 26.20 12.15 2.11 7.45 2.73 0.17 1.59
MORA1 2000 25.64 12.66 2.52 6.16 2.85 0.16 1.29
MORA1 2001 23.25 12.20 2.23 4.87 2.31 0.32 1.32
MORA1 2002 22.08 10.04 2.52 5.70 2.57 0.18 1.07
MORA1 2003 21.92 9.63 2.09 5.91 2.50 0.17 1.60
               
Slope (1/Mm/Year)   -0.957 -0.388 -0.005 -0.244 -0.082 -0.002 -0.090
S-Value   -29 -21 -5 -21 -25 -11 -21
P-Value   0.005 0.036 0.364 0.036 0.014 0.190 0.036

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)
MORA1 1994 10.70 3.62 2.58 2.06 0.92 0.07 1.44
MORA1 1995 8.99 2.51 2.66 1.92 0.80 0.04 1.07
MORA1 1996 9.27 2.93 1.62 2.89 0.90 0.06 0.87
MORA1 1997 7.70 3.35 0.65 2.28 0.64 0.05 0.72
MORA1 1998 5.93 1.91 0.62 1.70 0.33 0.05 1.32
MORA1 1999 7.60 2.59 0.53 2.38 0.83 0.06 1.20
MORA1 2000 7.51 3.48 0.75 1.97 0.74 0.06 0.51
MORA1 2001 6.97 3.12 0.85 1.56 0.85 0.06 0.53
MORA1 2002 5.03 2.20 0.58 1.07 0.53 0.03 0.62
MORA1 2003 5.03 1.91 0.56 1.44 0.65 0.04 0.43
               
Slope (1/Mm/Year)   -0.541 -0.115 -0.154 -0.121 -0.022 -0.002 -0.091
S-Value   -35 -15 -25 -23 -15 -13 -27
P-Value   0.000 0.108 0.014 0.023 0.108 0.146 0.008

Page last updated 30 March 2005