Metadata Report for BODC Series Reference Number 1794644

• 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

Problem Reports

No Problem Report Found in the Database

UK Ocean Acidification (UKOA) RRS James Clark Ross Cruise JR20130109/JR274 Underway Surface Hydrography Data Quality Report

The cruise report, cruise narrative and flow rate channel were used as a guide to the times when the underway flow was switched off, dropped low or was adjusted during the cruise. Where this occurred, channels PSALSU01, TEMPSU01, TEMPHU01, SVELSG01 and CNDCSG01 were flagged as suspect. Spikes in the channels were also flagged.

Data Access Policy

Open Data supplied by Natural Environment Research Council (NERC)

You must always use the following attribution statement to acknowledge the source of the information: "Contains data supplied by Natural Environment Research Council."

Narrative Documents

Turner Designs 10AU Field Fluorometer

The Turner Designs 10AU is designed for continuous-flow monitoring or discrete sample analyses of fluorescent species. A variety of optical kits with appropriate filters and lamps are available for a wide range of applications. Individual filters and lamps are also available for customised applications.

Standard optical kits include those for chlorophyll-a (extracted and/or in vivo), phycocyanin, phycoerythrin, CDOM, ammonium, rhodamine and fluorescein dye tracing, crude oil, refined oil, histamine and optical brighteners.

The instrument's light source is a 4 watt lamp and the detector is a photomultiplier tube with a standard detection range of 300-650 nm. A red-sensitive version with a detetion range of 185-970 nm is also available.

Specifications

Further details can be found in the manufacturer's specification sheet.

SeaBird MicroTSG Thermosalinograph SBE 45

The SBE45 MicroTSG is an externally powered instrument designed for shipboard measurement of temperature and conductivity of pumped near-surface water samples. The instrument can also compute salinity and sound velocity internally.

The MicroTSG comprises a platinum-electrode glass conductivity cell and a stable, pressure-protected thermistor temperature sensor. It also contains an RS-232 port for appending the output of a remote temperature sensor, allowing for direct measurement of sea surface temperature.

The instrument can operate in Polled, Autonomous and Serial Line Sync sampling modes:

• Polled sampling: the instrument takes one sample on command
• Autonomous sampling: the instrument samples at preprogrammed intervals and does not enter quiescence (sleep) state between samples
• Serial Line Sync: a pulse on the serial line causes the instrument to wake up, sample and re-enter quiescent state automatically

Specifications

Further details can be found in the manufacturer's specification sheet.

UK Ocean Acidification (UKOA) RRS James Clark Ross Cruise JR20130109/JR274 Underway Surface Hydrography Instrumentation

The instruments used to collect the surface hydrography datasets are displayed in the table below.

UK Ocean Acidification (UKOA) RRS James Clark Ross Cruise JR20130109/JR274 Underway Surface Hydrography Data Processing Document

Originator's Data Processing

The sea surface hydrography measurements were performed by a Sea Bird electronics thermosalinograph in the ship's flow through system and by a temperature sensor located near the flow through intake, at the hull. The depth of the flow through intake was 7 m. The data streams were logged every second to the SCS system and merged into a comma separated file format, and the header information was stored in .TPL files. The surface hydrography data were also logged to the Oceanlogger.ACO file. The SCS data files were submitted to BODC for post-cruise processing and data banking.

BODC Data Processing

Reformatting

The ACO underway data files were merged into a single binary merge file using time as the primary linking key. The time span of the file was from 03/01/2013 22:53:00 to 16/02/2013 14:34:00, with a sampling interval of 60 seconds.

Sea surface hydrography parameters were transferred to internal BODC format and matched against BODC parameter codes, as presented in the table below. No unit conversions were applied, as the originators units were equivalent to the units of the respective BODC parameter code units assigned. BODC processing procedures included loading of data and reduction through averaging, unit conversions, visual screening and flagging of anomalous values.

Screening

Each data channel was inspected on a graphics workstation and any spikes or periods of dubious data were flagged. The power of the workstation software was used to carry out comparative screening checks between channels by overlaying data channels. A map of the cruise track was simultaneously displayed in order to take account of the oceanographic context.

Calibration

Sample calibrations were applied dynamically to the surface hydrography salinity and temperature data.

Temperature

The thermosalinograph hull temperature and the thermosalinograph temperature were interpolated over the time recorded by the CTD. The stainless steel and titanium CTD temperature channels were used to obtain a linear regression to calibrate both of the underway temperature channels.

For the hull temperature, outliers were removed and an r² value of 0.996 was obtained. The temperature was then corrected using:

For the thermosalinograph temperature, once any outliers had been removed, an r² value of 0.967 was obtained and the temperature was corrected using:

Salinity

Both the stainless steel and titanium CTD's were used to calibrate the underway salinity channel. Once outliers had been removed, an r² value of 0.908 was obtained and the underway system was corrected using:

Project Information

UKOARP Theme B: Ocean acidification impacts on sea surface biology, biogeochemistry and climate

The overall aim of this theme is to obtain a quantitative understanding of the impact of ocean acidification (OA) on the surface ocean biology and ecosystem and on the role of the surface ocean within the overall Earth System.

The aims of the theme are:

• To ascertain the impact of OA on planktonic organisms (in terms of physiological impacts, morphology, population abundances and community composition).
• To quantify the impacts of OA on biogeochemical processes affecting the ocean carbon cycle (both directly and indirectly, such as via availability of bio-limiting nutrients).
• To quantify the impacts of OA on the air-sea flux of climate active gases (DMS and N₂O in particular).

The main consortium activities will consist of in-situ measurements on three dedicated cruises, as well as on-deck bioassay experiments probing the response of the in-situ community to elevated CO₂. Most of the planned work will be carried out on the three cruises to locations with strong gradients in seawater carbon chemistry and pH; the Arctic Ocean, around the British Isles and the Southern Ocean.

Weblink: http://www.oceanacidification.org.uk/research_programme/surface_ocean.aspx

Data Activity or Cruise Information

Cruise

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:

SeaDataNet Quality Control Flags

The following single character qualifying flags may be associated with one or more individual parameters with a data cycle: