Dataset: GP15 Total Aerosols Leg 2

Data Processing:Data have been corrected for field and analytical blank. Reported total aerosol trace element concentrations values have been normalized to the volume of air filtered during sample collection. Each sample collection period produced 36 replicate filters. Three of those filters were digested to produce three replicate measurements of total particulate aerosol concentration. Data from the three replicates were averaged and reported along with the standard deviation. Outliers and replicate samples that were below the field blank value were not included in the mean. Data are marked as described in the datasheet.

Quality Flags:
Quality flags have been applied with the following definitions:
0 = No quality control;
1 = Good value;
2 = Probably good value;
3 = Probably bad value;
4 = Bad value;
5 = Value changed;
6 = Value Below Detection;
7 = Value in excess;
8 = Interpolated value;
9 = Missing value.

Detection Limits:
Method detection limit was calculated from 3*STDEV of the measured filter blank. Filter blank, and thus method detection limit, varied among the three filter lots used. Sample values were compared to the detection limit calculated from the blank in the corresponding lot. The detection limit of each of the 3 lots is reported in the attached Supplemental File (PDF). Reported detection limits were not normalized by air volume and sample data were evaluated relative to the method detection limit prior to the normalization step in data processing. Data below the detection limit are flagged with code 6 and no value reported ("nd").

Concentration Averages:
Data values are averages of 3 separate filter digestions, except when values were excluded because:
(a) a value was determined to be an outlier by the Grubbs Test;
(b) a value was below the method detection limit.

BCO-DMO Processing:
- renamed fields;
- added date/time fields in ISO8601 format and removed original day, month, year, and time columns.