Yogesh Tiwari
2009-Jul-22 07:04 UTC
[R] how to calculate growth rate of CO2 (ppm) time series
Dear R Users, I have CO2 mixing ratio(ppm) time series data during 1991-2000. I would like to calculate CO2 growth rate /ppm.a-1 (is it derivative dt/dco2 ??) Kindly can any one advise how to calculate above. My data file looks like; time, year, month, day, hour, min, sec, lat, long, height, CO2 1991.476722 1991 6 24 0 5 0 -38.93 145.15 4270 353.680 1991.476741 1991 6 24 0 15 0 -39.20 145.22 4270 353.950 1991.476747 1991 6 24 0 18 0 -39.43 145.28 4270 353.510 ----------------------------------------------- 2000.740788 2000 9 28 3 5 0 -38.00 145.00 2280 366.750 2000.740794 2000 9 28 3 8 0 -38.00 145.00 1830 366.550 2000.740803 2000 9 28 3 13 0 -38.00 145.00 1220 370.550 Many great thanks, Best Regards, Yogesh -- Yogesh K. Tiwari (Dr.rer.nat), Scientist, Indian Institute of Tropical Meteorology, Homi Bhabha Road, Pashan, Pune-411008 INDIA Phone: 0091-99 2273 9513 (Cell) : 0091-20-25904350 (O) Fax : 0091-20-258 93 825 [[alternative HTML version deleted]]