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Cape Romain NWR Trends Analysis

The tables and figures below show the trends analysis results for 20% worst, middle 60% and 20% best days at ROMA1 based on light extinction coefficient data from 1995 to 2004 (no complete aerosol data is available in 1998). Overall, there is no significant trend in aerosol light extinction coefficients in 20% worst days. But there is a statistically significant decrease trend in coarse mass (CM) light extinction coefficients in 20% worst days. Significant decrease trends in CM light extinction coefficients are also found in 20% best and middle 60% visibility days. In 20% best days, aerosol light extinction coefficients decreased significantly due to decrease in light extinction coefficients of sulfate, 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
ROMA1 1995 166.39 154.39 117.24 5.31 18.78 5.13 1.44 0.39 6.09
ROMA1 1996 149.76 137.76 98.84 4.85 20.53 5.98 0.56 0.40 6.60
ROMA1 1997 150.03 138.03 103.09 3.88 19.15 5.47 0.89 0.00 5.55
ROMA1 1998                  
ROMA1 1999 190.07 178.07 139.72 4.30 21.17 5.56 0.82 0.62 5.88
ROMA1 2000 182.31 170.31 123.44 6.79 27.61 8.12 0.51 0.18 3.65
ROMA1 2001 133.31 121.31 83.28 6.40 23.13 5.17 0.55 0.18 2.61
ROMA1 2002 133.01 121.01 86.86 5.21 20.20 5.48 0.69 0.00 2.57
ROMA1 2003 120.01 108.01 76.36 4.20 17.33 4.82 0.41 0.00 4.88
ROMA1 2004 168.00 156.00 112.70 4.03 30.66 5.08 0.77 0.38 2.37
                   
Slope   -3.88 -3.88 -3.23 -0.10 0.56 -0.06 -0.04 -0.04 -0.47
S-Value   -10 -10 -10 -8 10 -10 -14 -10 -26
P-Value   0.179 0.179 0.179 0.238 0.179 0.179 0.090 0.179 0.003

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
ROMA1 1995 86.01 74.01 44.46 5.87 10.43 3.90 0.44 3.65 5.26
ROMA1 1996 84.01 72.01 43.05 5.60 11.22 4.80 0.47 1.78 5.08
ROMA1 1997 85.55 73.55 48.22 3.64 11.12 3.95 0.45 0.58 5.59
ROMA1 1998                  
ROMA1 1999 88.54 76.54 48.46 4.78 12.13 3.97 0.60 1.78 4.82
ROMA1 2000 90.21 78.21 46.18 6.35 14.08 5.66 0.71 0.95 4.28
ROMA1 2001 74.32 62.32 38.63 5.52 9.40 3.79 0.67 0.84 3.47
ROMA1 2002 69.74 57.74 36.51 4.93 9.39 3.39 0.40 1.04 2.08
ROMA1 2003 70.40 58.40 34.09 5.03 10.08 3.80 0.33 1.38 3.68
ROMA1 2004 79.93 67.93 43.40 4.18 10.85 3.24 0.61 2.80 2.85
                   
Slope   -1.94 -1.94 -1.05 -0.12 -0.04 -0.08 0.00 -0.03 -0.31
S-Value   -12 -12 -14 -10 -6 -16 2 -2 -26
P-Value   0.130 0.130 0.090 0.179 0.306 0.060 0.460 0.460 0.003

 

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
ROMA1 1995 48.45 36.45 18.39 2.76 5.89 2.27 0.18 2.94 4.01
ROMA1 1996 52.10 40.10 22.04 2.96 5.50 1.94 0.52 1.40 5.74
ROMA1 1997 45.81 33.81 18.40 2.42 5.03 2.10 0.45 1.18 4.22
ROMA1 1998                  
ROMA1 1999 49.42 37.42 19.58 3.10 5.76 2.31 0.46 2.69 3.53
ROMA1 2000 47.69 35.69 17.06 4.50 5.51 2.00 0.44 2.70 3.47
ROMA1 2001 40.35 28.35 15.40 3.05 4.21 1.82 0.27 1.23 2.37
ROMA1 2002 39.63 27.63 14.19 2.68 3.43 1.06 0.22 3.35 2.71
ROMA1 2003 39.86 27.86 14.33 2.37 4.94 1.64 0.18 0.99 3.40
ROMA1 2004 44.53 32.53 17.28 2.98 5.23 1.78 0.26 2.50 2.50
                   
Slope   -1.03 -1.03 -0.60 -0.01 -0.11 -0.07 -0.03 -0.04 -0.24
S-Value   -20 -20 -18 -2 -16 -20 -14 -4 -24
P-Value   0.022 0.022 0.038 0.460 0.060 0.022 0.090 0.381 0.006

 

Page last updated 4 May 2005