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Table 3

The Sen-Theil estimators for summertime mean of AOT40 and NVGT070 regional trends, p-values are derived from Mann-Kendall Test (GAMM approach), along with the means (SDs) of all individual intercepts and slopes (Regional mean approach). The overall statistics include the TOAR unclassified category. DOI: https://doi.org/10.1525/elementa.243.t3

Summertime mean of AOT40
RegionGAMM approachRegional mean approach

Intercept (ppb hr)Slope (ppb hr yr–1)p-valueIntercept (ppb hr)Slope (ppb hr yr–1)

 
Eastern N America Overall 20751 –640 <0.01 19543(7861) –633(390) 
 Rural 20821 –735 <0.01 19801(8490) –721(407) 
 Urban 17282 –439 <0.01 16129(7330) –412(345) 

 
Europe Overall 12874 –180 <0.01 13383(8069) –255(381) 
 Rural 15755 –303 <0.01 15882(8602) –364(406) 
 Urban 10245 –130 <0.01 10433(7545) –138(325) 

 
E Asia Overall 15663 260 <0.01 15098(9170) 253(678) 
 Rural 17033 302 <0.01 15865(6565) 280(763) 
 Urban 15152 343 <0.01 14785(10199) 335(627) 
Summertime mean of NVGT070
 
Region  GAMM approach Regional mean approach 

 
Intercept (days) Slope (days yr–1) p-value Intercept (days) Slope (days yr–1) 

 
Eastern N America Overall 15.37 –0.96 <0.01 17.07(11.41) –1.16(0.75) 
 Rural 15.58 –1.04 <0.01 14.77(10.65) –1.12(0.76) 
 Urban 16.36 –1.03 <0.01 15.19(11.21) –0.92(0.70) 

 
Europe Overall 6.52 –0.33 <0.01 7.88(9.60) –0.42(0.59) 
 Rural 9.08 –0.48 <0.01 8.27(10.45) –0.48(0.70) 
 Urban 5.87 –0.26 <0.01 6.15(8.39) –0.33(0.53) 

 
E Asia Overall 14.92 0.30 <0.01 16.46(16.38) 0.12(1.24) 
 Rural 17.22 0.05 <0.01 13.76(10.30) 0.30(1.30) 
 Urban 13.76 0.55 <0.01 17.43(18.42) 0.21(1.21) 
Summertime mean of AOT40
RegionGAMM approachRegional mean approach

Intercept (ppb hr)Slope (ppb hr yr–1)p-valueIntercept (ppb hr)Slope (ppb hr yr–1)

 
Eastern N America Overall 20751 –640 <0.01 19543(7861) –633(390) 
 Rural 20821 –735 <0.01 19801(8490) –721(407) 
 Urban 17282 –439 <0.01 16129(7330) –412(345) 

 
Europe Overall 12874 –180 <0.01 13383(8069) –255(381) 
 Rural 15755 –303 <0.01 15882(8602) –364(406) 
 Urban 10245 –130 <0.01 10433(7545) –138(325) 

 
E Asia Overall 15663 260 <0.01 15098(9170) 253(678) 
 Rural 17033 302 <0.01 15865(6565) 280(763) 
 Urban 15152 343 <0.01 14785(10199) 335(627) 
Summertime mean of NVGT070
 
Region  GAMM approach Regional mean approach 

 
Intercept (days) Slope (days yr–1) p-value Intercept (days) Slope (days yr–1) 

 
Eastern N America Overall 15.37 –0.96 <0.01 17.07(11.41) –1.16(0.75) 
 Rural 15.58 –1.04 <0.01 14.77(10.65) –1.12(0.76) 
 Urban 16.36 –1.03 <0.01 15.19(11.21) –0.92(0.70) 

 
Europe Overall 6.52 –0.33 <0.01 7.88(9.60) –0.42(0.59) 
 Rural 9.08 –0.48 <0.01 8.27(10.45) –0.48(0.70) 
 Urban 5.87 –0.26 <0.01 6.15(8.39) –0.33(0.53) 

 
E Asia Overall 14.92 0.30 <0.01 16.46(16.38) 0.12(1.24) 
 Rural 17.22 0.05 <0.01 13.76(10.30) 0.30(1.30) 
 Urban 13.76 0.55 <0.01 17.43(18.42) 0.21(1.21) 
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