Analysis by state
   Analysis by class I
   Analysis by region
   Descriptive maps
   Backtrajectories
   Trends analysis
   PMF Modeling
   Episode analysis
   Dust analysis
   Tribal analysis
   Fish & Wildlife
   Terms & acronyms
For best results,
please use:
Internet Explorer 5
(or higher)
Netscape 6
(or higher)
more info...
Conceptual
Model
Site
Setting
Aerosol
& Trends Analysis
Backtrajectory
Analysis
PMF
Analysis
PMF Weighted
Backtrajectory Analysis
Okefenokee NWR Trends Analysis

The tables and figures below show the trends analysis results for 20% worst, middle 60% and 20% best days at OKEF1 based on light extinction coefficient data from 1992 to 2004. Overall, there is a significant decrease trend in aerosol light extinction coefficients in 20% worst days, mainly due to decrease in light extinction coefficients of sulfate and coarse mass (CM). There is a statistically significant decrease trend in aerosol light extinction coefficients in middle 60% days as well, caused by decrease in sulfate, CM and elemental carbon (LAC) light extinction coefficients. Only light extinction coefficients of CM decreased significantly in the 20% best 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
OKEF1 1992 190.65 179.65 129.33 6.95 28.61 7.72 2.39 1.28 3.38
OKEF1 1993 198.04 187.04 147.22 5.52 21.04 5.24 1.74 0.06 6.22
OKEF1 1994 156.83 145.83 101.35 6.97 21.42 6.80 1.82 1.22 6.25
OKEF1 1995 185.21 174.21 141.42 5.12 16.13 5.00 0.64 0.31 5.59
OKEF1 1996 159.53 148.53 111.80 4.17 19.85 6.10 0.57 0.69 5.36
OKEF1 1997 165.96 154.96 119.20 2.95 18.88 5.45 0.68 0.00 7.80
OKEF1 1998 161.59 150.59 109.99 3.81 22.68 6.74 1.41 0.13 5.83
OKEF1 1999 188.46 177.46 129.80 4.74 31.07 6.51 0.75 0.40 4.19
OKEF1 2000 181.50 170.50 108.93 5.73 41.44 8.34 0.77 0.25 5.03
OKEF1 2001 160.89 149.89 98.55 5.31 36.20 5.55 0.82 0.31 3.14
OKEF1 2002 158.76 147.76 95.97 5.57 35.14 7.54 0.79 0.06 2.69
OKEF1 2003 131.58 120.58 86.44 4.66 21.06 5.13 0.87 0.00 2.41
OKEF1 2004 164.27 153.27 124.41 3.13 17.72 4.36 0.96 0.55 2.14
                   
Slope   -2.35 -2.35 -3.06 -0.16 0.34 -0.08 -0.05 -0.04 -0.38
S-Value   -28 -28 -36 -22 10 -12 -2 -19 -46
P-Value   0.050 0.050 0.015 0.102 0.295 0.255 0.476 0.153 0.002

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
OKEF1 1992 97.01 86.01 58.43 5.89 11.30 4.78 0.40 2.25 2.97
OKEF1 1993 93.54 82.54 56.40 5.10 11.84 3.91 0.86 0.35 4.07
OKEF1 1994 83.62 72.62 45.42 5.27 11.05 4.11 0.97 1.43 4.36
OKEF1 1995 85.74 74.74 46.18 5.94 10.93 4.72 0.74 1.46 4.78
OKEF1 1996 87.82 76.82 47.20 5.06 10.87 4.67 0.84 0.89 7.29
OKEF1 1997 79.90 68.90 44.97 4.03 9.63 3.81 0.71 0.43 5.32
OKEF1 1998 84.19 73.19 46.55 3.72 12.55 4.48 0.95 0.55 4.39
OKEF1 1999 91.51 80.51 50.77 5.08 14.55 4.82 0.64 0.64 4.01
OKEF1 2000 87.56 76.56 46.27 6.12 13.43 4.38 0.66 1.02 4.68
OKEF1 2001 78.86 67.86 41.67 6.08 12.48 3.36 0.97 0.17 3.14
OKEF1 2002 77.34 66.34 41.62 4.62 12.90 3.63 0.58 0.39 2.61
OKEF1 2003 72.92 61.92 38.60 4.69 11.71 3.59 0.77 0.20 2.37
OKEF1 2004 74.58 63.58 40.86 4.15 10.85 2.84 0.74 1.85 2.29
                   
Slope   -1.68 -1.68 -1.08 -0.08 0.08 -0.09 -0.01 -0.08 -0.20
S-Value   -48 -48 -48 -18 4 -38 -6 -20 -30
P-Value   0.001 0.001 0.001 0.153 0.429 0.011 0.383 0.126 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
OKEF1 1992 51.85 40.85 24.08 3.30 6.22 2.52 0.45 2.00 2.30
OKEF1 1993 52.52 41.52 26.45 3.29 6.65 2.30 0.40 0.08 2.35
OKEF1 1994 48.22 37.22 17.97 3.88 6.25 2.41 0.95 2.35 3.42
OKEF1 1995 45.00 34.00 18.13 3.17 5.32 2.76 0.25 1.47 2.91
OKEF1 1996 50.40 39.40 21.78 3.16 5.74 2.70 0.55 1.00 4.46
OKEF1 1997 46.36 35.36 18.48 2.86 5.30 2.44 0.65 0.35 5.27
OKEF1 1998 54.19 43.19 25.40 2.95 8.19 3.01 0.41 0.34 2.89
OKEF1 1999 46.91 35.91 18.25 3.36 6.90 2.49 0.91 1.41 2.58
OKEF1 2000 54.80 43.80 24.33 4.92 8.02 2.84 0.43 0.31 2.96
OKEF1 2001 45.36 34.36 17.19 3.92 7.19 2.13 0.51 1.12 2.30
OKEF1 2002 45.99 34.99 19.13 4.02 7.05 2.18 0.37 0.27 1.96
OKEF1 2003 39.18 28.18 16.04 2.13 6.04 1.70 0.37 0.05 1.87
OKEF1 2004 48.11 37.11 21.76 3.34 5.90 2.01 0.52 1.81 1.77
                   
Slope   -0.41 -0.41 -0.28 0.01 0.04 -0.05 0.00 -0.06 -0.13
S-Value   -20 -20 -16 4 6 -24 -8 -24 -30
P-Value   0.126 0.126 0.184 0.429 0.383 0.082 0.338 0.082 0.038

 

Page last updated 4 May 2005