Dataset: GP15 Bottle Leg 1

Unit conversion for nutrients and oxygen:
Nutrients and oxygen were measured onboard the ship in umol/L, but are reported in umol/kg in this dataset. The ODF group used the following protocols for conversion:

For converting nutrient and oxygen measurements to units of umol/kg, density was calculated according to EOS-80, using the best available salinities (either bottle or CTD, depending on quality flag in that order). The source for temperature depends on the analyte. For oxygen, the draw temperature at the time of collection was used for density calculations (Culberson, 1991; WHP Operations and Methods, Dissolved Oxygen). For nutrients, the measured analytical lab temperature was used for density calculations (Becker et al., 2021; GO-SHIP Repeat Hydrography Manual: The precise and accurate determination of dissolved inorganic nutrients in seawater, using Continuous Flow Analysis methods). The lab temperature was measured at the location of the instrument, and the samples themselves were allowed to come to lab temperature before analysis.

Quality Flags:
FLAG columns follow the WOCE Hydrographic Program (WHP) quality flag definitions.

The WHP quality codes for the water bottle itself are:
1 = Bottle information unavailable.
2 = No problems noted.
3 = Leaking.
4 = Did not trip correctly.
5 = Not reported.
6 = Significant discrepancy in measured values between Gerard and Niskin bottles.
7 = Unknown problem.
8 = Pair did not trip correctly. Note that the Niskin bottle can trip at an unplanned depth while the Gerard trips correctly and vice versa.
9 = Samples not drawn from this bottle.
(Flags 6, 7, and 8 apply primarily to large volume samplers.)

The WHP bottle parameter data quality codes are:
1 = Sample for this measurement was drawn from water bottle but analysis not received. Note that if water is drawn for any measurement from a water bottle, the quality flag for that parameter must be set equal to 1 initially to ensure that all water samples are accounted for.
2 = Acceptable measurement.
3 = Questionable measurement.
4 = Bad measurement.
5 = Not reported.
6 = Mean of replicate measurements (Number of replicates should be specified).
7 = Manual chromatographic peak measurement.
8 = Irregular digital chromatographic peak integration.
9 = Sample not drawn for this measurement from this bottle.

The WHP CTD data quality codes are:
1 = Not calibrated.
2 = Acceptable measurement.
3 = Questionable measurement.
4 = Bad measurement.
5 = Not reported.
6 = Interpolated over >2 dbar interval.
7 = Despiked.
8 = Not assigned for CTD data.
9 = Not sampled.

BCO-DMO Processing:
- changed time format to hhmm;
- added ISO8601 date/time column;
- filled in missing values with "nd";
- replaced -999 and -999.000 with "nd";
- Version history:
- 2021-05-05 (v6; current) - replaced with file received 2021-05-03, which includes several corrections/edits.
- 2021-03-26 (v5) - replaced GEOTRC_EVENTNO "6544" with "6548" (for samples 12486-12509). As per the event log, 6544 was aborted and those sample numbers were used in event 6548.
- 2020-09-22 (v4) - from original file named "33RR20180918_hy1_v5_door_barcodes.xlsx" contains GEOTRACES DOoR-formatted names; splits the data into one file per leg.
- 2020-03-02 (v3) - from original file named "33RR20180918_hy1_v5.xlsx" submitted on 02-March-2020.
- 2019-10-22 (v2) - from original file named "33RR20180918_hy1_v4_pjl.xlsx" submitted on 2019-10-14.
- 2019-09-25 (v1) - from original file named "33RR20180918_hy1_v3.csv" submitted on 2019-09-10