Parameter | Meaning | full data | before 1991 | after 1994 | (unit) |
A | Expon. trend | 50.1 | 18.2 | 49.0 | (ppm) |
t0 | Expon. time constant | 61.69 | 32.32 | 60.81 | (year) |
B | Sine amplitude | 2.85 | 2.75 | 2.96 | (ppm) |
C | Base line | 256.4 | 291.2 | 257.3 | (ppm) |
φ0 | Sine phase | −0.368 | −0.410 | −0.311 | (rad) |