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dc2
2009 Jul 22
0
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....