AMT11 extracted chlorophyll-a measured fluormetrically from underway samples
Data Acquisition and Analysis
A pre-determined volume of water was collected approximately every 4 hours from the ship's non-toxic underway seawater supply.
A 250 ml water sample from each depth was gently filtered through 0.2 µm glass fibre filters for the determination of total chlorophyll-a concentration. Each filter was extracted in 10 ml of 90% acetone for 24 hours in a -20 °C walk in freezer. Chlorophyll-a was measured on a 10-AU Turner Design digital fluorometer calibrated against a standard chlorophyll-a stock solution.
References Cited
Instrumentation Description
Not relevant to this dataset.
BODC Data Processing Procedures
Data were submitted to BODC in an Excel spreadsheet and accessioned under BODC archive PML040069. The sample metadata provided (Date, Solar Day, time (local and GMT), latitude and longitude) were loaded to the database and the latitude and longitude were replaced by the position from the navigation data stream at the sample time (GMT) provided in the file.
Parameter codes defined in BODC parameter dictionary were assigned to the variable. The units supplied in the spreadsheet were µg l -1 , which were equivalent to the Parameter Dictionary units so no unit conversions were necessary.
Data were loaded into BODC's database following established BODC databanking procedures.
A parameter mapping table is provided below.
| Originator's Parameter | Units | Description | BODC Parameter Code | Units | Comments |
|---|---|---|---|---|---|
| [Chla] | µg l -1 | Concentration of chlorophyll-a {chl-a} per unit volume of the water body [particulate >GF/F phase] by filtration, acetone extraction and fluorometry | CPHLFLP1 | mg m -3 | n/a |
Data Quality Report
BODC were not advised of any data quality checks made by the data originator prior to submission of the dataset.
Problem Report
Not relevant to this dataset.
