Year

NO2 (ppmv)

U(ti)

U'(ti)

CO2 (ppmv)

U(ti)

U'(ti)

2011

2012

2013

2014

135.695

127.516

133.934

132.747

0.000

1.509

0.686

−1.097

−2.057

0.137

−2.194

−1.920

382.370

385.108

388.111

392.186

1.509

0.960

1.783

0.411

−1.509

−0.960

−0.137

−0.411