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Chassahowitzka NWR Trends Analysis

The tables and figures below show the trends analysis results for 20% worst, middle 60% and 20% best days at CHAS1 based on light extinction coefficient data from 1994 to 2002 (no complete aerosol data is available in 2003 and 2004). Overall, there is no significant trend in aerosol light extinction coefficients in 20% worst days. But there are statistically significant decrease trends in elemental carbon (LAC) and coarse mass (CM) light extinction coefficients in 20% worst days. Significant decrease trends of LAC and CM light extinction coefficients are also found in 20% best and middle 60% visibility days.

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
CHAS1 1994 158.83 147.83 101.86 6.09 21.44 8.85 2.70 1.35 5.54
CHAS1 1995 148.15 137.15 100.44 4.96 16.76 9.06 0.92 0.35 4.65
CHAS1 1996 128.88 117.88 83.30 4.81 13.82 7.13 0.64 0.90 7.27
CHAS1 1997 150.25 139.25 105.73 3.42 17.87 7.13 0.65 0.07 4.38
CHAS1 1998 146.41 135.41 95.58 3.78 19.85 8.08 2.20 0.00 5.93
CHAS1 1999 149.93 138.93 101.74 4.82 19.36 7.13 0.61 0.11 5.15
CHAS1 2000 157.92 146.92 99.71 6.39 28.21 8.69 0.71 0.20 3.00
CHAS1 2001 136.60 125.60 89.99 5.65 19.29 5.83 1.39 0.34 3.10
CHAS1 2002 125.05 114.05 78.59 5.33 20.60 6.19 0.66 0.00 2.69
                   
Slope   -2.39 -2.39 -1.72 0.05 0.55 -0.32 -0.03 -0.08 -0.37
S-Value   -12 -12 -16 4 10 -20 -6 -15 -20
P-Value   0.130 0.130 0.060 0.381 0.179 0.022 0.306 0.090 0.022

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
CHAS1 1994 84.13 73.13 40.93 6.00 11.46 6.35 1.04 2.52 4.83
CHAS1 1995 81.64 70.64 39.86 6.39 9.92 6.14 0.89 1.51 5.92
CHAS1 1996 79.79 68.79 39.64 5.22 10.09 5.68 0.69 1.31 6.16
CHAS1 1997 86.83 75.83 48.72 4.40 10.88 5.26 1.02 0.31 5.25
CHAS1 1998 84.68 73.68 43.44 4.45 12.14 5.41 1.35 0.67 6.22
CHAS1 1999 92.35 81.35 50.25 5.88 13.22 6.19 0.86 0.61 4.33
CHAS1 2000 85.27 74.27 44.93 6.13 11.56 5.72 0.86 0.77 4.31
CHAS1 2001 74.67 63.67 38.94 5.71 10.01 4.79 0.91 0.09 3.21
CHAS1 2002 74.50 63.50 39.70 5.13 10.02 4.22 0.63 0.44 3.36
                   
Slope   -0.95 -0.95 -0.08 -0.05 0.01 -0.22 -0.02 -0.21 -0.35
S-Value   -6 -6 -2 -6 2 -20 -12 -22 -18
P-Value   0.306 0.306 0.460 0.306 0.460 0.022 0.130 0.012 0.038

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
CHAS1 1994 52.39 41.39 18.77 4.20 6.89 3.57 0.76 2.36 4.84
CHAS1 1995 48.96 37.96 16.47 4.70 5.78 3.49 0.46 2.45 4.61
CHAS1 1996 55.15 44.15 22.92 3.93 6.72 4.15 0.88 0.95 4.60
CHAS1 1997 50.48 39.48 19.23 3.69 6.79 3.97 0.32 1.63 3.85
CHAS1 1998 56.19 45.19 24.93 3.52 8.11 4.05 0.74 0.22 3.62
CHAS1 1999 52.42 41.42 20.78 4.30 7.46 3.48 0.50 1.26 3.65
CHAS1 2000 51.56 40.56 20.94 4.52 6.60 3.47 0.36 1.56 3.11
CHAS1 2001 51.51 40.51 21.51 5.22 5.16 2.59 0.95 1.49 3.60
CHAS1 2002 45.17 34.17 17.16 4.43 5.70 2.37 0.34 0.57 3.58
                   
Slope   -0.50 -0.50 0.26 0.07 -0.07 -0.16 -0.02 -0.17 -0.19
S-Value   -8 -8 6 8 -10 -22 -6 -14 -30
P-Value   0.238 0.238 0.306 0.238 0.179 0.012 0.306 0.090 0.000

Page last updated 4 May 2005