Attributes {
    lat {
        String units "degrees_north";
        String long_name "latitude starting at -89.5, by 1 degree increments";
        String standard_name "latitude";
    }
    lon {
        String units "degrees_east";
        String long_name "longitude starting at -179.5, by 1 degree increments";
        String standard_name "longitude";
    }
    time {
        String units "seconds since 1970-01-01 00:00:00Z";
        String long_name "averaging period in seconds since 1970-01-01 00:00:00Z";
        String bounds "time_bnds";
    }
    press_level {
        String units "hPa";
        String long_name "atmospheric layer equivalent pressure";
    }
    nh3_vmr {
        Float32 _FillValue -999.900024;
        String units "mol/mol, number of moles of ammonia per mole of air";
        String long_name "volume mixing ratio of ammonia in air";
        Float32 max 1.80689135e-08;
        Float32 min 2.10043463e-13;
        String standard_name "NH3 volume mixing ratio";
    }
    time_bnds {
        String units "seconds since 1970-01-01 00:00:00Z";
        String long_name "start and end time of the month, in seconds since 1970-01-01 00:00:00Z";
    }
    NC_GLOBAL {
        String title "NH3.mar.2003.V3";
        String comment "This data are produced by Drs. Juying Warner and Zigang Wei using measurements from the AIRS instrument";
        String keywords "EARTH SCIENCE > ATMOSPHERE > Atmopheric Chemistry > Ammonia";
        String source "Aqua AIRS AMSU";
        String shortname "AIRSAC3MNH3";
        String longname "NH3 Volume Mixing Ratio";
        String format "netCDF";
        Int32 versionid 3;
        String rangebeginningdate "20030301";
        String rangebeginningtime "00:00:00.000000";
        String rangeendingdate "20030331";
        String rangeendingtime "23:59:59.999999";
        String identifierproductdoiauthority "http://dx.doi.org/10.5067/06YIT7GX74FN";
        String processing_level "3";
        String product_start_date_time "2003-03-01 00:00:00";
        String product_end_date_time "2003-03-31 23:59:59";
        String product_name_type_id "L3";
        String acknowledgment "Support for this research was provided by NASA HQ through ROSES: NNX12AJ05G, NNX14AJ24G, and NNX16AQ67G.";
        String instrument "Aqua AIRS AMSU";
        String product_name_extension "nc";
        String featuretype "grid";
        String data_structure "grid";
        String summary "The Level-3 monthly mean ammonia VMRs in daytime and over land, derived using the measurements from the AIRS and AMSU instruments on the NASA Aqua platform.";
        String contributor_name "Dr. Juying Warner, University of Maryland, College Park, MD";
        String contributor_role "Research PI";
        String creator_name "NASA/GSFC GESDISC";
        String history "AIRS ammonia from Sep. 2002 through Aug. 2016";
        String creator_email "gsfc-help-disc@lists.nasa.gov";
        String creator_url "http://disc.gsfc.nasa.gov/";
        String institution "NASA GSFC GES DISC";
        String metadata_link "http://disc.sci.gsfc.nasa.gov/";
        String references "
Warner, J. X., R. R. Dickerson, Z. Wei, L. L. Strow, Y. Wang, and Q. Liang (2017),  Increased atmospheric ammonia
    over the world’s major agricultural areas detected from space, Geophys. Res. Lett.,  44, doi:10.1002/2016GL072305

Warner, J. X., Z. Wei, L. L. Strow, R. R. Dickerson, and J. B. Nowak (2016),  The global tropospheric ammonia
    distribution as seen in the 13-year AIRS measurement record, Atmos. Chem. Phys., 16, 5467-5479,
    https://doi.org/10.5194/acp-16-5467-2016";
        String doi "10.5067/06YIT7GX74FN";
    }
}