Metadata Report for BODC Series Reference Number 1880938

• 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

Orkney Passage Moorings 2015 - 2017 Data Quality Report

For several series during the 2015 - 2017 deployment the mooring fluctuacted in the water column by 40 - 200 metres. This includes SBE37, SBE39 and Aquadopp instruments.

The affected SBE39 series include: series reference number 1891555, 1891567, 1891579 and 1891611.

The affected SBE37 series include: 1880871, 1880883, 1880895, 1880902, 1880914, 1880926, 1880938, 1880951, 1880963, 1880975, 1880987, 1880999, 1881002, 1881026, 1881038, 1881051, 1881063, 1881075, 1881087, 1881099, 1881106, 1881118, 1881131, 1881179, 1881211, 1881223, 1881235, 1881247, 1881259, 1881260, 1881296, 1881303, 1881315, 1881327, 1881339, 1881340, 1881352, 1881364, 1881376 and 1881388.

The affected Aquadopp series include: 40600, 40800, 40900, 41000, 41100, 41200, 41300, 41400, 41500, 41600, 41700, 41800, 41900, 42300, 42400, 42500, 42600, 42700, 42800, 42900, 43000, 43100, 43600, 43700, 43800, 43900, 44000, 44100, 44600, 44700, 44800, 44900, 45000, 45100, 45200, 45300 and 45400.

These fluctuations do not appear to have affected the temperature data and therefore no flags have been added.

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

Sea-Bird SBE 37-SMP MicroCAT

The SBE 37-SMP MicroCAT is a high accuracy conductivity and temperature recorder (pressure optional) with Serial interface, internal battery, non-volatile FLASH Memory and integral Pump. The Integral Pump runs for 1 second each time the MicroCAT samples, improving the conductivity response and giving improved anti-foul protection.

Designed for moorings and other long-duration, fixed-site deployments, MicroCATs have non-corroding titanium housings rated for operation to 7000 meters or pressure sensor full scale-range. Communication with the MicroCAT is over an internal, 3-wire, RS-232C link. The MicroCAT's aged and pressure-protected thermistor has a long history of exceptional accuracy and stability (typical drift is less than 0.002°C per year). Electrical isolation of the conductivity electronics eliminates any possibility of ground-loop noise.

Specifications

Further information can be found via the following link: Sea-Bird SBE 37-SMP MicroCAT Datasheet

BODC Data Processing

Data Processing

The data arrived at BODC as individual .mat files containing data collected on moorings OP1, OP2, OP3, OP4, OP5, OP6, OP7, CI1 and CI2. They were submitted as part of an accession which includes data from several mooring instruments e.g. Aquadopp, RCM8, RCM11, RBR, SBE37 and SBE39.

Reformatting

Parameters in the originator's files were reformatted into an internal file format using BODC standard procedures.

The following table lists all the parameters included in the internal format files, showing how the originator's variables as named in the matlab files were mapped to appropriate BODC parameter codes.

No derived parameters were calculated by BODC. Please note that not all parameters are present in all files.

Screening

Quality control flags were automatically added to data outside the expected parameter specific range during the reformatting process. All parameters were then visualised and screened using in house software, and any improbable or missing data point was assigned a quality control flag.

Originator's Data processing

Sampling strategy

Sampling was carried out as part of the BAS LTMS (British Antarctic Survey Long Term Monitoring and Survey) until 2016. From 2016 onwards the moorings are split between 'The Ocean Regulation of Climate by Heat and Carbon Sequestration and Transports (ORCHESTRA)' project and 'Dynamics of the Orkney Passage Outflow (DynOPO)' project.

The projects involve the deployment of moorings CI1, CI2, OP1, OP2, OP3, OP4, OP5, OP6 and OP7 in the Southern Ocean, situated north of Coronation Island and the Orkney Passage in the Weddell and Scotia Sea.

Moorings CI1 and CI2 were deployed from 2005 to 2007 and moorings OP1, OP2, OP3, OP4, OP5 and OP6 have been continuously maintained since 2007 with the addition of OP7 in 2015.

SBE 37 and SBE39 instruments were deployed on the moorings. Data have been collected at variable intervals: 5 minutes interval on the Coronation Island moorings, 7.5 minute interval on the instruments deployed on OP2 and OP3 in 2007 and 15 minute intervals since then. Gaps in the series may be caused by either instruments not being recovered, or data not being collected due to instrument malfunction.

Data processing

Little information is known with regards to the exact details of the calibrations carried out on the mooring data. Data processing, visualisation and calibration were carried out through the use of scripts for Matlab version R2014b produced and ran by the originator.

An offset has been applied some of the channels. The values for each deployment/instrument/channel combination are shown in the table below:

Several instruments deployed in the 2013/15 period show evidence of knock-down but the data colleaction seems to be unnafected. According to the originator some of the moorings were deployed with insufficient buyoancy which caused the knockdowns. These instances are especially visible on moorings OP1 and OP2, Series Reference number 1840205, 1840229, 1840254, 1840266 and 1840278

Several instruments deployed in the 2015/17 period did not have a pressure sensor and used inferred pressure calculated from the closest neigbhouring pressure sensor. This includes five SBE39 instruments (s/n 4413, 4716, 4713, 4418 and 4409) and one SBE37 instrument (s/n 8267).

Several instruments deployed in the 2017/19 period did not have a pressure sensor, therefore no pressure channel was transferred with the data and only a nominal depth is used in the metadata. This includes all SBE39 instruments (s/n 4413, 4409, 0083, 4713, 4418 and 4716) and one SBE37 instrument (s/n 8267).

Project Information

No Project Information held for the Series

Data Activity or Cruise Information

Data Activity

Orkney Passage Mooring 1 (OP1)

The mooring was deployed at the following positions:

The mooring was deployed on the Orkney Passage on cruise JR20150309 (JR272D, JR310) on 05 April 2015 and recovery was done on cruise JR16005 on 15 April 2017.

The table below lists the instruments deployed on this mooring:

Related Data Activity activities are detailed in Appendix 1

Cruise

Complete Cruise Metadata Report is available here

Fixed Station Information

Fixed Station Information

Orkney Passage OP1 site

Site OP1 is part of the Orkney Passage mooring array which is an activity covered by the Long Term Monitoring and Survey British Antarctic Survey's (BAS) programme.The data collection is the result of an ongoing collaboration between BAS and the Lamont-Doherty Earth Observatory (LDEO).

This site was previously occupied in 2007 by an LDEO mooring (M4) and from 2011 onwards it became BAS's responsibility and was assigned its current name. The recovery/deployment history, including position details is presented below:

Recovery of this mooring was not possible in 2009, during ES033a, cruise due to an unresponsive release. It was re-deployed again in 2011.

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: OP1

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: Orkney Passage OP1

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.