Explanation of the Flags (column "F" ) for station indices RYO239N0, MNM224N0 and YON224N0



1. CO2, CH4 and CO

1-1 Hourly data

       Insufficient number   High standard           Large discrepancy with

       of data               deviation               an adjacent measure

        (less than 60)     (exceeding the value A)   (exceeding the value B)



flag 0:      yes                  yes                 yes  ->  data out of a background condition

flag 1:      no                   yes                 yes        ditto

flag 2:      yes                  no                  yes        ditto

flag 3:      no                   no                  yes        ditto

flag 4:      yes                  yes                 no         ditto

flag 5:      no                   yes                 no         ditto

flag 6:      yes                  no                  no         ditto

flag 7:      no                   no                  no   ->  data in a background condition

flag 9: Missing due to unknown reasons



Index No.           value A     value B   value A    value B    value A    value B

                    for CO2     for CO2   for CH4    for CH4    for CO     for CO

RYO239N0            0.6 ppm     0.3 ppm    7 ppb      6 ppb      8 ppb      4 ppb 

MNM224N0            0.3 ppm     0.3 ppm    6 ppb      6 ppb      4 ppb      4 ppb

YON224N0            0.6 ppm     0.3 ppm    7 ppb      6 ppb      8 ppb      4 ppb



1-2 Daily and monthly data

flag 2: Missing due to no valid hourly data in the period

flag 3: Valid data

flag 9: Missing due to unknown reasons



2. CFCs, CH3CCl3, CCl4 and N2O

2-1 Hourly data

flag 6: No data

flag 7: Valid data



2-2 Daily data

        Insufficien number of data     High standard deviation

         (less than 3)                 (exceeding the value C)



flag 0:       yes                               yes  ->  data out of a background

flag 1:       no                                yes        ditto

flag 2:       yes                               no         ditto

flag 3:       no                                no   ->  data in a background condition



           CFC-11     CFC-12   CFC-113    CH3CCl3    CCl4      N2O   

value C:    10 ppt    20 ppt     7 ppt    10 ppt    10 ppt    10 ppt



2-3 Monthly data

flag 2: Missing due to no valid daily data in the period

flag 3: Data in a background condition