Metadata Report for BODC Series Reference Number 1988038

• 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

Data Access Policy

Open 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.

If the Information Provider does not provide a specific attribution statement, or if you are using Information from several Information Providers and multiple attributions are not practical in your product or application, you may consider using the following:

"Contains public sector information licensed under the Open Government Licence v1.0."

Narrative Documents

Agilent 8453 UV-visible spectrophotometer

A laboratory optical instrument for chemical analysis to extract spectral information in the ultraviolet (UV) and visible light. The instrument radiates a single light beam by optically combining two source lamps: a deuterium-discharge lamp for the UV wavelength range and a tungsten lamp for the visible and short wave near-infrared (SWNIR) wavelength range. The beam passes through the sample, is focused and dispersed within the spectrograph lens, slit and grating, and reaches the diode array in the form of a spectral image. The diode array samples a wavelength range of 190 to 1100 nm at a mean sampling interval of 0.9 nm. The nominal spectral slit width is 1 nm and the stray light is less than 0.03%.

For more information, please see these documents:

https://www.bodc.ac.uk/data/documents/nodb/pdf/agilent_8453_uv_visible_spectrophotometer_brochure.pdf

https://www.bodc.ac.uk/data/documents/nodb/pdf/agilent_8453_uv_visible_spectrophotometer_manual.pdf

Metrohm 876 Dosimat plus Burette

A laboratory instrument designed for precise dosing of liquids. It is commonly used for titration and simple dosing operations. It supports manual dosing as well as user-selectable fixed volume dosing. It is equipped with a USB connector, a Metrohm Serial Bus (MSB) connector (meant for a stirrer or an 805 Dosimat dosing device), and a RS-232 remote connector for a Manual Dosing Controller or other instruments. The cylinder volume can be set to 1, 5, 10, 20 or 50 mL. Depending on the cylinder volume selected, the maximum dosing and filling rates range between 0.01 - 150 mL/min.

For more information, please see these documents:

https://www.bodc.ac.uk/data/documents/nodb/pdf/metrohm_876_dosimat_plus_brochure.pdf

https://www.bodc.ac.uk/data/documents/nodb/pdf/metrohm_876_dosimat_plus_manual.pdf

Niskin Bottle

The Niskin bottle is a device used by oceanographers to collect subsurface seawater samples. It is a plastic bottle with caps and rubber seals at each end and is deployed with the caps held open, allowing free-flushing of the bottle as it moves through the water column.

Standard Niskin

The standard version of the bottle includes a plastic-coated metal spring or elastic cord running through the interior of the bottle that joins the two caps, and the caps are held open against the spring by plastic lanyards. When the bottle reaches the desired depth the lanyards are released by a pressure-actuated switch, command signal or messenger weight and the caps are forced shut and sealed, trapping the seawater sample.

Lever Action Niskin

The Lever Action Niskin Bottle differs from the standard version, in that the caps are held open during deployment by externally mounted stainless steel springs rather than an internal spring or cord. Lever Action Niskins are recommended for applications where a completely clear sample chamber is critical or for use in deep cold water.

Clean Sampling

A modified version of the standard Niskin bottle has been developed for clean sampling. This is teflon-coated and uses a latex cord to close the caps rather than a metal spring. The clean version of the Levered Action Niskin bottle is also teflon-coated and uses epoxy covered springs in place of the stainless steel springs. These bottles are specifically designed to minimise metal contamination when sampling trace metals.

Deployment

Bottles may be deployed singly clamped to a wire or in groups of up to 48 on a rosette. Standard bottles and Lever Action bottles have a capacity between 1.7 and 30 L. Reversing thermometers may be attached to a spring-loaded disk that rotates through 180° on bottle closure.

JR15003 CTD Bottle pH and Alkalinity Samples

Originator's Protocol for Data Acquisition and Analysis

pH and alkalinity samples were taken from four Southern Ocean Carbon and Climate Observations and Modeling (SOCCOM) stations along the repeat hydrographic section SR1b during cruise JR15003, between 7^th and 9^th January 2016. Samples were taken using a SBE 911plus CTD unit, with 24 Niskin bottles fitted to the rosette sample. From these Niskin bottles, 500 ml samples were drawn, and preserved with mercury (II) chloride and packed for shipping via air freight to Scripps Institution of Oceanography for analysis. For alkalinity analysis, the Dickson Titration System was used, with the Alkalinity 2.9j LabView Program installed. For pH analysis, Brendan Carter's Spectrophotometric pH system was used (Carter et al. 2013). For more information, please see section 9 of the cruise report.

BODC Data Processing Procedures

The pH and Alkalinity data were supplied to BODC in .csv format. Data were then loaded into BODC's database using established BODC data banking procedures.

The originator's variables were mapped to appropriate BODC parameter codes as follows:

Data Quality Report

The originator indicated that bottle 10 on CTD16 was leaking, but did not indicate any problems with the pH and alkalinity data obtained from this bottle. Alkalinity samples from bottles 8 and 11 on CTD09, 6 and 13 on CTD12, and the pH sample from bottle 23 on CTD20 were all flagged as 'questionable measurements' by the originator. These WOCE bottle flags were converted to BODC 'L' flags.

References

Carter B.R., Radich J.A., Doyle H.L. and Dickson A.G., 2013. An automated system for spectrophotometric seawater pH measurements. Limnology and Oceanography: Methods, 11, 16-27.

Project Information

NOCS National Capability

The National Oceanography Centre Southampton National Capability focuses on long term science concerned with basin/decadal variability of the Ocean.

Data Activity or Cruise Information

Data Activity

BODC Sample Metadata Report for JR15003_CTD_CTD16

Please note:the supplied parameters may not have been sampled from all the bottle firings described in the table above. Cross-match the Sample Reference Number above against the SAMPRFNM value in the data file to identify the relevant metadata.

Related Data Activity activities are detailed in Appendix 1

Cruise

Complete Cruise Metadata Report is available here

Fixed Station Information

Fixed Station Information

World Ocean Circulation Experiment (WOCE) Southern Repeat Section 1B - Falkland Islands to Elephant Island

WOCE Southern Repeat Section 1B is a section across Drake Passage in the South Atlantic Ocean. The nominal end points of the section (to date) are at 52° 55.74' S, 58° 00.00' W (at the south of the Falkland Islands) and 61° 03.05' S, 54° 33.10' W (off Elephant Island at the north end of the Antarctic Peninsula).

The section was first occupied by the R/V Polarstern in 1992 (Gersonde, 1993). The first UK occupation of SR1b followed on RRS Discovery later the same year. The National Oceanography Centre, Southampton (formerly known as Southampton Oceanography Centre), in collaboration with the British Antarctic Survey, have occupied the section most years since 1993 on the RRS James Clark Ross. Additionally, there were three Spanish occupations on R/V Hespérides in February 1995, 1996 and 1998 (Garcia et al., 2002). A Drake Passage summary report for RRS James Clark Ross cruises between 1993 - 2000 has been produced.

A table of cruises which occupied SR1b is presented below with links to the relevant cruise reports (were available).

References

García, M. A., I. Bladé, A. Cruzado, Z. Velásquez, H. García, J. Puigdefàbregas and J. Sospedra, 2002: Observed variability of water properties and transports on the World Ocean Circulation Experiment SR1b section across the Antarctic Circumpolar Current. J. Geophys. Res. 107 (C10) 3162, 10.1029/2000JC000277.

Gersonde, R., 1993: The Expedition Antarktis X/5 of RV Polarstern in 1992. Berichte zur Polarforschung, 131, 167 pp.

Related Fixed Station activities are detailed in Appendix 2

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:

Appendix 1: JR15003_CTD_CTD16

Related series for this Data Activity are presented in the table below. Further information can be found by following the appropriate links.

If you are interested in these series, please be aware we offer a multiple file download service. Should your credentials be insufficient for automatic download, the service also offers a referral to our Enquiries Officer who may be able to negotiate access.

Appendix 2: Drake Passage - WOCE SR1b

Related series for this Fixed Station are presented in the table below. Further information can be found by following the appropriate links.

If you are interested in these series, please be aware we offer a multiple file download service. Should your credentials be insufficient for automatic download, the service also offers a referral to our Enquiries Officer who may be able to negotiate access.