After downloading data from the GEIA web site, you should do some simple checks to assure that you have downloaded and interpreted the data values correctly.
Most GEIA data files include the miniumum, maximum, and total value in the header. Once you have downloaded the data find the minimum, maximum values and compare these values to the values in the header.
Most GEIA data is presented in mass per time period per 1 by 1 degree grid. Taking the sum of the data values is the total flux value that is given in the header. A simple data check will be to take the simple sum of the data values and compare them to the total flux value that is in the header file.
The table below contains the minimum, maximum, and simple sum for the data files. After downloading the datafiles, calculate the minimum, maximum, and totals to assure that you have downloaded the data correctly.
| File | Simple Sum (Total Flux) | Minimum | Maximum |
| antbc84yr1.1a | 7.9685E+06 | 4.0500E-01 | 7.8300e+04 |
| biobc87mn1.1a | 5.9805E+06 | 1.0300E-01 | 5.3254e+03 |
| blc85yr1.1a | 1.26E+07 | .139E+01 | 198000. |
| cfc1186yr1.1a* | 100% | 4.99E-05 | 1.94 |
| cfc1286yr1.1a* | 100% | 5.01E-05 | 2.48 |
| CO250YR1.1A | 1587.946 million tonnes C | 0 | 30.986 |
| CO260yr1.1a | 2503.2 million tonnes C | 0 | 35.592 |
| CO270yr1.1a | 3857.8 million tonnes C | 0 | 51.882 |
| CO280yr1.1a | 5075 million tonnes C | 0 | 56.169 |
| CO290yr1.1a | 5833.9 million tonnes C | 0 | 59.953 |
| COVavg1.1a | 26227 | 3 | 4000 |
| isop90mn1.1a* | 4.3818E+07 | 0 | 4.9157E+03 |
| LOCavg1.1a | 5.450E+06 | 1.000E+00 | 2.500E+02 |
| n2oag90y.1a | 9.1379E+04 | 2.0000E+00 | 1.9600E+02 |
| n2oan90y.1a | 1.0213E+06 | 1.1000E+01 | 1.2367E+03 |
| n2obb90y.1a | .90760E+05 | .30000E+01 | .12880E+04 |
| n2obf90y.1a | 1.2842E+05 | 1.0000E+00 | 6.9200E+02 |
| n2ode90y.1a | 3.6087E+05 | 2.1560E+01 | 1.1520E+03 |
| n2ofo90y.1a | 2.9422E+05 | 1.0000E+00 | 8.7240E+03 |
| n2oin90y.1a | .43750E+06 | .12000E+02 | .51468E+05 |
| n2ooc90y.1a. | 5.9605E-08 | .12848E+03 | .11743E+04 |
| n2oso90y.1a | .75317E+07 | .10000E+01 | .44720E+04 |
| nox85yr1.1a1 | 2.095428E+07 | 0.3031E+00 | .1186E+06 |
| noxlig1.1a | 9.107086E+08 | 1.6E-02 | 5.164062E+05 |
| noxlig2.1a | 8.187782E+08 | 3.7E-02 | 4.308264E+05 |
| noxlig3.1a | 9.511153E+08 | 1.4E-02 | 4.693083E+05 |
| noxlig4.1a | 9.068451E+08 | 2.8E-02 | 4.373486E+05 |
| noxlig5.1a | 1.033846E+09 | 2.1E-02 | 4.462757E+05 |
| noxlig6.1a | 1.213335E+09 | 1.0E-02 | 6.085208E+05 |
| noxlig7.1a | 1.442218E+09 | 1.8E-02 | 6.012187E+05 |
| noxlig8.1a | 1.273805E+09 | 1.3E-02 | 4.971798E+05 |
| noxlig9.1a | 1.010436E+09 | 1.0E-02 | 4.500308E+05 |
| noxlig10.1a | 9.136791E+08 | 8.0E-03 | 4.783899E+05 |
| noxlig11.1a | 8.502396E+08 | 1.8E-02 | 4.431603E+05 |
| noxlig12.1a | 8.845779E+08 | 2.1E-02 | 5.032977E+05 |
| noxligan.1a | 1.2210e+10 | 1.74e-01 | 4.4517e+06 |
| nvoc90mn1.1a* | 2.3108E+07 | 0 | 2.0837E+03 |
| so285yr1.1a1 | 6.505602E+07 | 0.1500E-01 | .1108E+07 |
| soilNOX90mn1.1a | 1998 level 1 | 0.91E-27 level 1 | 0.75E+01 level 1 |
| SPVmax1.1a | 277622 | 2 | 97050 |
| terp90mn1.1a* | 1.18E+07 | 0 | 1.69E+03 |
* minimum, maximum, and total values do not appear on header
NOTE: Reactive Chlorine data is in different units, so use the information below!
For the Reactive Chlorine data, the individual data in each grid are in units of mass per time period per square meters. Therefore the simple sum does not give the total flux value as it does for the other GEIA data. A conversion must be done for the Reactive Chlorine data to calculate the total flux. The total flux can be calculated using the simple algorithm below, and then checked against the total flux given in the header.
Multiply each data entry by cos(lat) where cos(lat) is
cos(lat) = cos((j-91)+0.5)*pi/180)
Sum the data and multiply the sum by
((radius of earth)*pi/180) * ((radius of earth)*pi/180)
Where radius of earth = 6.371e6 meters
Using this algorithm, the files should integrate to the header values to within 1%. Differing methods of calculation result in slightly different
results.
For the purposes of data checking only, the following table shows the simple sums for Reactive Chlorine. These values may be used to check downloaded data, by summing the data values and comparing the results to the values in this table. Please note, these values are for data checking only, and have no physical meaning.
| File | Simple Sum (for data checking only, no physical meaning!) |
Header Value |
| CH2Cl2.90.yr.1.1a.bioburn.dat | 4.409030885 | .0492798 Tg Cl/yr |
| CH3CCl3.90.yr.1.1a.anthro.dat | 60.83521599 | .576893 Tg Cl/y |
| CH3CCl3.90.yr.1.1b.bioburn.dat | 1.159320227 | .0129580Tg Cl/yr |
| CH3CCl3.90.yr.1.1a.total.dat | 61.99441888 | .586955 Tg CL/yr |
| CH3CL.90.yr.1.1a.anthro.dat | 11.99355541 | .115009 Tg Cl/yr |
| CH3Cl.90.yr.1.1a.bioburn.dat | 56.8295348 | .643299Tg Cl/yr |
| CH3Cl.90.yr.1.1a.natural.dat | 34.75143644 | .469967 Tg Cl/yr |
| CH3Cl.90.yr.1.1a.total.dat | 103.2199153 | 1.21959 Tg Cl/yr |
| CHCl3.90.yr.1.1a.anthro.dat | 6.240411876 | .0580075 Tg Cl/yr |
| CHCl3.90.yr.1.1b.bioburn.dat | 0.158947229 | .00177658 Tg Cl/yr |
| CHCl3.90.yr.1.1b.composite.dat | 57 | .0597792 Tg Cl/yr |
| Cl.90.yr.1.1a.bioburn.dat | 561.378812 | 6.38510 Tg Cl/yr |
| Cl.90.yr.1.1a.total.dat | 1976.940686 | 19.8936 Tg Cl/yr |
| ClNO2.90.yr.1.1a.seasalt.dat | 7.283019549 | .0547334 Tg Cl/yr |
| F22.90.yr.1.1a.anthro.dat | 9.50495189 | .0886411 TgCl/yr |
| HCl.90.yr.1.1a.anthro.dat | 695.3330119 | 6.69593 TgCl/yr |
| HCl.90.yr.1.1a.seasalt.dat | 718.0887013 | 7.00198 Tg Cl/yr |
| MeCl.90.yr.1.1a.anthro.dat | 53.47873893 | .490461 TgCl/yr |
| Perc.90.yr.1.1a.anthro.dat | 34.0765686 | .309688 TgCl/yr |
| Trik.90.yr.1.1a.anthro.dat | 21.96695799 | .198183 TgCl/yr |