Table 12 List of attributes in the files originating from discrete whole air samples, and archived on the NOAA GML webpage.
From: Year-round trace gas measurements in the central Arctic during the MOSAiC expedition
Variable | Definition |
|---|---|
sample_site_code | Three-character sampling location code (“CRS” for “cruise” in our case). |
sample_year | The sample collection date and time in Coordinated Universal Time. |
sample_month | |
sample_day | |
sample_hour | |
sample_minute | |
sample_seconds | |
sample_id | The sample container ID |
sample_method | A single-character code that identifies the sample collected method (“P” on our case, meaning that the sample was collected using a portable, battery powered pumping unit – See methods section). |
parameter_formula | Gas identifier (e.g., CO2, C2H6). |
analysis_group_abbr | Identifies the group with NOAA and INSTAAR making the actual measurement (e.g., CCGG, HATS, SIL). |
analysis_value | Dry air mole fraction or isotopic composition. Missing values are denoted by −999.99. |
analysis_uncertainty | Estimated uncertainty of the reported measurement value. Missing values are denoted −999.99. |
analysis_flag | A three-column quality control flag indicating the results of data rejection and selection process. Column 1: rejection flag. An alphanumeric other than a period (.) in the first column indicates a sample with obvious problems during collection or analysis. This measurement should not be interpreted. Column 2: selection flag. An alphanumeric other than a period (.) in the second column indicates a sample that is likely valid but does not meet selection criteria determined by the goals of a particular investigation. Column 3: information flag. An alphanumeric other than a period (.) in the third column provides additional information about the collection or analysis of the sample. Note that a “P” in the third column indicates the measurement result is preliminary. |
analysis_instrument | A 2-character code that identifies the instrument used for the measurement. |
analysis_year | The measurement date and time in local time. |
analysis_month | |
analysis_day | |
analysis_hour | |
analysis_minute | |
analysis_seconds | |
sample_latitude | The latitude where the sample was collected in degrees north. |
sample_longitude | The longitude where the sample was collected in degrees east. |
sample_altitude | The altitude of the sample inlet in meters above sea level. The reported altitude is the surface elevation plus sample intake height. |
sample_elevation | Surface elevation in meters above sea level. |
sample_intake_height | Air sample collection height above ground level. |
event_number | A long integer that uniquely identifies the sampling event. |
