Metadata Report for BODC Series Reference Number 1672358
Metadata Summary
Problem Reports
Data Access Policy
Narrative Documents
Project Information
Data Activity or Cruise Information
Fixed Station Information
BODC Quality Flags
SeaDataNet Quality Flags
Metadata Summary
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Time Co-ordinates(UT) |
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Parameters |
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Problem Reports
No Problem Report Found in the Database
Data Access Policy
Public domain data
These data have no specific confidentiality restrictions for users. However, users must acknowledge data sources as it is not ethical to publish data without proper attribution. Any publication or other output resulting from usage of the data should include an acknowledgment.
The recommended acknowledgment is
"This study uses data from the data source/organisation/programme, provided by the British Oceanographic Data Centre and funded by the funding body."
Narrative Documents
Non-toxic (underway) sea water supply
A source of uncontaminated near-surface (commonly 3 to 7 m) seawater pumped continuously to shipboard laboratories on research vessels. There is typically a temperature sensor near the intake (known as the hull temperature) to provide measurements that are as close as possible to the ambient water temperature. The flow from the supply is typically directed through continuously logged sensors such as a thermosalinograph and a fluorometer. Water samples are often collected from the non-toxic supply. The system is also referred to as the underway supply.
Phytoplankton pigment concentration data series for cruise Challenger CH140
Document History
Converted from CDROM documentation.
Data Originator
Ken Jones, Dunstaffnage Marine Laboratory (DML), Oban, UK.
Content of data series
| Parameter | Unit | Parameter code | Number of samples | Number of stations | Comments |
|---|---|---|---|---|---|
| Chlorophyll a (total) | µg l-1 | CPHLHPP1 | 76 | 17 CTD + 9 NT | none |
| Chl. a (sum of size-fractions >0.2 µm) | µg l-1 | CPHLHPP4 | 6 | 1 CTD | none |
| Chl. a (0.2-2 µm) | µg l-1 | SCHLHPPF | 6 | 1 CTD | none |
| Chl. a (2-20 µm) | µg l-1 | SCHLHPPG | 6 | 1 CTD | none |
| Chl. a (>20 µm) | µg l-1 | SCHLHPPQ | 6 | 1 CTD | none |
CTD= CTD-Rosette water column sampling station.
NT= surface underway sampling from ship's non-toxic supply (ca. 4 m).
Sampling strategy and methodology
Water samples were collected mainly from the near surface, bottom mixed layers and in the vicinity of the thermocline using the CTD-rosette water sampler. Full vertical profiles of phytopigment distribution were determined from 4 CTD casts. Occasional samples were also taken from the ship's non-toxic water supply for calibration of the underway fluorometer. Water (200 ml) was filtered through 2.5 cm GF/F filters and the filters were stored frozen for later analysis at Dunstaffnage Marine Laboratory. At one CTD station water samples were size-fractionated by passage through a filter stack consisting of polycarbonate filters of 18, 2 and 0.2 µm pore size. Filters were stored as described above.
Chlorophyll a was extracted into 8 ml of 90% acetone and analysed by isocratic HPLC analysis.
BODC processing
The data were loaded into a database under the ORACLE Relational Database Management System without modification.
Comments on data quality
None to report.
Project Information
PROcesses of Vertical Exchange in Shelf Seas (PROVESS)
Introduction
PROVESS was an interdisciplinary study of the vertical fluxes of properties through the water column and the surface and bottom boundary layers. The project was funded by the European Community MAST-III programme (MAS3-CT97- 0159) and ran from March 1998 to May 2001.
Scientific Rationale
PROVESS was based on the integration of experimental, theoretical and modelling studies with the aim of improving understanding and quantification of vertical exchange processes in the water column, in particular in the surface and benthic boundary layers and across the> pycnocline. PROVESS also explored mechanisms of physical-biological coupling in which vertical exchanges and turbulence significantly affect the environmental conditions experienced by the biota with particular reference to aggregation, flocculation, sedimentation and trophic interactions.
Fieldwork
The experimental phase of the project was carried out at two contrasting sites in the North Sea: the northern North Sea site (NNS) and the southern North Sea site (SNS).
The two sites had the following characteristics:
| SNS | NNS | |
|---|---|---|
| Position | 52° 15.0' N, 4° 17.0' E | 59° 20.0' E, 1° 00.0' E |
| Time of year | April-May | September-November |
| Water depth (m) | 16 | 100 |
| M2 max amplitude (m s-1) | 0.75 | 0.15 |
| Max current (m s-1) | 1.0 | 0.6 |
| Delta T (deg C) | mixed | 7-1 |
| Thermocline depth (m) | mixed | 35-100 |
| Delta S | 1 | small |
| Halocline depth (m) | 5-10 | cf. thermocline depth |
| Max wind speed (m s-1) | 20 | 25 |
| Max wave height (m) | 5 | 10 |
| Max wave period (s) | 8 | 10 |
| Internal motion | No | Yes |
| Sediment | muddy-sand | muddy-sand |
| Biology | eutrophic | oligotrophic |
At both locations measurements were concentrated at a central position with additional measurements being made to estimate horizontal gradients. Moored instruments (including current meters, temperature and pressure sensors, fluorometers, transmissometers, nutrient analysers and meteorological sensors) were deployed between 7 September and 5 November 1998 at the NNS and between 29 March and 25 May 1999 at the SNS. Each experiment was supported by intensive measurement series made from oceanographic ships and involving turbulence dissipation profiler CTD, particle size profilers, optical profilers, benthic sampling and water bottle sampling.
Details of the cruises were as follows:
| Site | Ship (nationality) | Cruise Mnemonic | Date |
|---|---|---|---|
| NNS | Valdivia (GER) | VA174 | 5 - 17 Sep 1998 |
| Dana (DK) | D1198 | 14 - 26 Oct 1998 | |
| Pelagia (NL) | PE125 | 19 - 30 Oct 1998 | |
| Challenger (UK) | CH140 | 22 Oct - 9 Nov 1998 | |
| SNS | Pelagia (NL) | PE135 | 29 Mar - 9 Apr 1999 |
| Mitra (NL) | MT0499 | 19 - 30 Apr 1999 | |
| Belgica (BE) | BG9912 | 17 - 21 May 1999 |
Data Activity or Cruise Information
Cruise
| Cruise Name | CH140 (PROVESS N-4) |
| Departure Date | 1998-10-21 |
| Arrival Date | 1998-11-11 |
| Principal Scientist(s) | M John Howarth (Proudman Oceanographic Laboratory) |
| Ship | RRS Challenger |
Complete Cruise Metadata Report is available here
Fixed Station Information
No Fixed Station Information held for the Series
BODC Quality Control Flags
The following single character qualifying flags may be associated with one or more individual parameters with a data cycle:
| Flag | Description |
|---|---|
| Blank | Unqualified |
| < | Below detection limit |
| > | In excess of quoted value |
| A | Taxonomic flag for affinis (aff.) |
| B | Beginning of CTD Down/Up Cast |
| C | Taxonomic flag for confer (cf.) |
| D | Thermometric depth |
| E | End of CTD Down/Up Cast |
| G | Non-taxonomic biological characteristic uncertainty |
| H | Extrapolated value |
| I | Taxonomic flag for single species (sp.) |
| K | Improbable value - unknown quality control source |
| L | Improbable value - originator's quality control |
| M | Improbable value - BODC quality control |
| N | Null value |
| O | Improbable value - user quality control |
| P | Trace/calm |
| Q | Indeterminate |
| R | Replacement value |
| S | Estimated value |
| T | Interpolated value |
| U | Uncalibrated |
| W | Control value |
| X | Excessive difference |
SeaDataNet Quality Control Flags
The following single character qualifying flags may be associated with one or more individual parameters with a data cycle:
| Flag | Description |
|---|---|
| 0 | no quality control |
| 1 | good value |
| 2 | probably good value |
| 3 | probably bad value |
| 4 | bad value |
| 5 | changed value |
| 6 | value below detection |
| 7 | value in excess |
| 8 | interpolated value |
| 9 | missing value |
| A | value phenomenon uncertain |
| B | nominal value |
| Q | value below limit of quantification |
