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Moosehorn NWR Trends Analysis

The tables and figures below show the trends analysis results for 20% worst, middle 60% and 20% best days at MOOS1 based on light extinction coefficient data from 1995 to 2004. Overall, there is no significant trend in aerosol light extinction coefficients in 20% worst days. But there is statistically significant decrease trends in aerosol light extinction coefficients in 20% best and middle 60% days. In the middle 60% days, the decrease is caused mainly by sulfate, coarse mass (CM) and elemental carbon (LAC).

Table 1. Trends analysis of light extinction coefficients (1/Mm) for 20% worst visibility days
site year Total Bext Aerosol Ext EAmm_SO4 EAmm_NO3 EOMC ELAC ESoil ESea_Salt ECM
MOOS1 1995 101.50 89.50 59.57 5.88 16.90 4.60 0.29 0.44 1.82
MOOS1 1996 90.86 78.86 49.09 4.48 13.90 4.03 0.27 4.13 2.97
MOOS1 1997 98.11 86.11 55.80 3.58 19.28 4.03 0.33 0.11 2.99
MOOS1 1998 100.09 88.09 66.37 2.98 12.82 3.98 0.39 0.02 1.55
MOOS1 1999 93.45 81.45 58.59 4.48 10.44 3.63 0.31 1.62 2.37
MOOS1 2000 81.39 69.39 43.47 8.51 8.76 3.62 0.28 2.04 2.70
MOOS1 2001 103.28 91.28 66.06 5.90 12.80 3.96 0.47 0.00 2.09
MOOS1 2002 112.50 100.50 71.50 6.40 16.03 3.99 0.42 0.49 1.67
MOOS1 2003 106.01 94.01 64.69 5.49 13.47 7.27 0.36 0.39 2.33
MOOS1 2004 80.00 68.00 46.53 5.67 8.65 3.18 0.39 1.81 1.78
                   
Slope   0.56 0.56 0.77 0.18 -0.66 -0.05 0.01 -0.01 -0.09
S-Value   3 3 3 9 -19 -17 19 -1 -11
P-Value   0.431 0.431 0.431 0.242 0.054 0.078 0.054 0.500 0.190

Table 2. Trends analysis for middle 60% visibility days
site year Total Bext Aerosol Ext EAmm_SO4 EAmm_NO3 EOMC ELAC ESoil ESea_Salt ECM
MOOS1 1995 46.79 34.79 17.99 3.65 6.35 2.70 0.22 1.95 1.93
MOOS1 1996 47.18 35.18 19.65 2.61 6.06 2.43 0.19 1.86 2.39
MOOS1 1997 44.90 32.90 18.73 2.32 6.16 2.52 0.19 0.12 2.85
MOOS1 1998 41.85 29.85 16.37 2.22 6.15 2.39 0.29 0.26 2.16
MOOS1 1999 45.50 33.50 18.00 2.86 6.35 2.30 0.27 1.31 2.41
MOOS1 2000 42.76 30.76 15.87 2.76 6.42 2.77 0.22 0.83 1.89
MOOS1 2001 41.36 29.36 16.87 3.00 5.17 2.54 0.23 0.10 1.44
MOOS1 2002 40.46 28.46 15.64 3.22 5.29 2.15 0.24 0.48 1.45
MOOS1 2003 40.78 28.78 14.90 2.68 6.12 2.13 0.20 1.21 1.54
MOOS1 2004 37.51 25.51 13.56 2.37 5.32 1.74 0.21 1.05 1.27
                   
Slope   -0.92 -0.92 -0.56 -0.03 -0.07 -0.07 0.00 -0.09 -0.14
S-Value   -35 -35 -33 -1 -11 -25 -1 -9 -25
P-Value   0.000 0.000 0.001 0.500 0.190 0.014 0.500 0.242 0.014

 

Table 3. Trends analysis for 20% best visibility days
site year Total Bext Aerosol Ext EAmm_SO4 EAmm_NO3 EOMC ELAC ESoil ESea_Salt ECM
MOOS1 1995 28.25 16.25 7.54 1.43 3.55 1.57 0.16 0.55 1.46
MOOS1 1996 26.35 14.35 6.16 1.00 3.10 1.27 0.11 0.85 1.85
MOOS1 1997 25.88 13.88 6.41 1.14 2.95 1.03 0.12 0.43 1.80
MOOS1 1998 25.05 13.05 6.15 0.72 3.21 1.18 0.21 0.36 1.22
MOOS1 1999 26.12 14.12 6.18 1.00 2.67 1.53 0.14 0.69 1.91
MOOS1 2000 25.13 13.13 6.61 1.15 3.02 1.24 0.09 0.03 0.99
MOOS1 2001 25.52 13.52 7.02 1.29 3.01 1.04 0.14 0.13 0.90
MOOS1 2002 25.15 13.15 6.55 1.04 3.08 1.00 0.12 0.26 1.09
MOOS1 2003 25.98 13.98 7.39 0.91 3.09 0.91 0.10 0.34 1.24
MOOS1 2004 24.65 12.65 5.76 0.91 3.12 0.93 0.11 0.71 1.10
                   
Slope   -0.21 -0.21 0.01 -0.02 0.00 -0.05 0.00 -0.03 -0.09
S-Value   -21 -21 1 -13 -1 -29 -13 -9 -15
P-Value   0.036 0.036 0.500 0.146 0.500 0.005 0.146 0.242 0.108

 

Page last updated 4 May 2005