TWO CURVE FITTING METHODS APPLIED TO CO2 FLASK DATA

摘要: Digital filtering and harmonic regression curve fitting techniques are applied to CO2 flask data from four stations in North America (Pt. Barrow, Alert, Sable Island Cape St. James) evaluate these two different methodologies terms of growth rate seasonal cycle the atmospheric concentration. Both methods agree relatively well producing long-term trend at each monitoring stations, as capturing large interannual variations annual rate. Furthermore, they both indicating dependency variation amplitude on minimum The digital technique is able capture local temporal measurements much better than method, although some cases this variability exaggerated approach. approach tends smooth out data, with power very long period oscillations. Also, timing occurrence calculated by method be earlier that do not indicate any major secular change timing. overall assessment underscores importance using more one before conclusions can drawn about © 1997 John Wiley & Sons, Ltd.