Metadata Report for BODC Series Reference Number 777298


Metadata Summary

Data Description

Data Category Hydrography time series at depth
Instrument Type
NameCategories
RBR TR-1050 underwater temperature logger  water temperature sensor
Instrument Mounting subsurface mooring
Originating Country United Kingdom
Originator Prof Andy Clarke
Originating Organization British Antarctic Survey
Processing Status banked
Project(s) RaTS
 

Data Identifiers

Originator's Identifier TR11410.DEP1CAL
BODC Series Reference 777298
 

Time Co-ordinates(UT)

Start Time (yyyy-mm-dd hh:mm) 2005-01-25 15:00
End Time (yyyy-mm-dd hh:mm) 2006-01-25 00:00
Nominal Cycle Interval 3600.0 seconds
 

Spatial Co-ordinates

Latitude 67.56706 S ( 67° 34.0' S )
Longitude 68.23371 W ( 68° 14.0' W )
Positional Uncertainty 0.05 to 0.1 n.miles
Minimum Sensor Depth 234.0 m
Maximum Sensor Depth 234.0 m
Minimum Sensor Height 288.0 m
Maximum Sensor Height 288.0 m
Sea Floor Depth 522.0 m
Sensor Distribution Fixed common depth - All sensors are grouped effectively at the same depth which is effectively fixed for the duration of the series
Sensor Depth Datum Unspecified -
Sea Floor Depth Datum Unspecified -
 

Parameters

BODC CODE Rank Units Short Title Title
AADYAA01 1 Days Date(Loch_Day) Date (time from 00:00 01/01/1760 to 00:00 UT on day)
AAFDZZ01 1 Days Time(Day_Fract) Time (time between 00:00 UT and timestamp)
ACYCAA01 1 Dimensionless Record_No Sequence number
TEMPTC01 1 Degrees Celsius WaterTemp_TC Temperature of the water body by in-situ thermistor
 

Definition of Rank

  • Rank 1 is a one-dimensional parameter
  • Rank 2 is a two-dimensional parameter
  • Rank 0 is a one-dimensional parameter describing the second dimension of a two-dimensional parameter (e.g. bin depths for moored ADCP data)

Problem Reports

No Problem Report Found in the Database


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

RBR TR-1050 Submersible Temperature Recorder

The TR-1050 is a small (230mm x 38mm OD), self-contained, submersible RBR (Ltd) temperature recorder with a calibration to + or - 0.002 o C. Typical calibration drift of 0.002 o C per year has been measured. It can be deployed for a period of up to three years and can collect more than 2,400,000 samples.

The TR-1050 has a measurement range of -5 o C to +35 o C in its standard calibration. It can, however, be configured to measure wider ranges. The logger can be fitted with different thermistors to operate to as low as -40 o C or up to +50 o C The TR-1050 may also be configured to measure a far higher range, if it is fitted with an external probe.

BODC Processing

The data arrived at BODC in Matlab binary .MAT files representing data collected by a temperature recorder from a mooring positioned in Marguerite Bay, Antarctica which was deployed in conjuction with the Rothera Oceanographic and Biological Time Series (RaTS). These were reformatted to the internal QXF format using BODC transfer function 390. The following table shows how the variables within the matlab files were mapped to appropriate BODC parameter codes:

Originator's Variable Units Description BODC Parameter Code Units Comment
tempcal degrees Celsius Temperature of the water column by in-situ thermistor TEMPTC01 degrees Celsius Offset applied from reference CTD

The reformatted data were visualised using the in-house EDSERPLO software. Suspect data were marked by adding an appropriate quality control flag, missing data by both setting the data to an appropriate value and setting the quality control flag.

External Data Processing

The RaTS moored TR data were subjected to a number of checks and calibrations externally, prior to be being received by BODC.

Temperature data from moored TR were compared to the temperature data collected from the weekly CTD cast made at the RaTS site. The TR corresponded well with the RaTS CTD casts where a small correction (less than 0.05 o C) was made to the time averaged moored data. See table 1 for further details.

Table 1: Offsets applied to the moored TR data at RaTS

Moored sensor Deployment Temp. offset ( o C)
TR11410 1 0.0102
2 -0.0089
3 0.0427

Reference:

Wallace, M.I., 2007 . Ocean circulation, properties and variability in Marguerite Bay, west Antarctic Peninsula. PhD Thesis. The Open University, Milton Keynes, UK.


Project Information

Rothera Oceanographic and Biological Time Series (RaTS)

The RaTS programme, which has been run by the British Antarctic Survey since 1997, involves the long-term monitoring of the nearshore marine environment. The project has always been funded by the Natural Environment Research Council (NERC); it initially was a discrete project within the BAS marine biological programme but has now been moved to form a component of the BAS Long Term Monitoring and Survey (LTMS) programme.

Scientific Aims

The RaTS programme was started with two broad aims. The first was to provide a suite of oceanographic data that would provide the environmental background to aid interpretation of the nearshore marine ecology. The second was to test a series of broad hypotheses concerned with surface and deep water coupling and environmental forcing of the nearshore oceanic environment. The key questions formulated at the start of the programme were:

1. To what extent is the physics of the upper water column (ice dynamics, thermal characteristics and vertical structure) related to large-scale forcing such as the El-Niño Southern Oscillation?

2. How and to what extent is variability in the physics of the upper water column transferred to biological processes, particularly primary production?

3. How and to what extent does variability in the timing and in the intensity of the summer phytoplankton bloom affect key ecological processes in the benthos, and particularly feeding, growth and reproduction?

To answer these questions an integrated programme of regular oceanographic and biological measurements was implemented. Observations are taken at a fixed station, selected to be safely accessible by boat in summer and snowmobile in winter whilst being well away from normal ship traffic. Operations at this site included regular CTD casts, discrete water sampling and the deployment of three moorings equipped with current profilers and other hydrography sensors.


Data Activity or Cruise Information

Data Activity

Start Date (yyyy-mm-dd) 2005-01-25
End Date (yyyy-mm-dd) 2006-02-15
Organization Undertaking ActivityBritish Antarctic Survey
Country of OrganizationUnited Kingdom
Originator's Data Activity IdentifierRaTS_dep1
Platform Categorysubsurface mooring

RaTS Mooring Deployment 1

The first deployment of the mooring at the RaTS site occurred on 25th January 2005 and was later recovered on 15th February 2006. Prior to deployment, all sensors were programmed to sample for a duration of a year. However, due to a delay in the recovery, all sensors except for the ADCP have a data gap of ~3 weeks. Both deployment and recovery were carried out onboard the RRS James Clark Ross.

The exact position of the mooring is as follows:

Deployment Latitude Longitude
1 67.56706 oS 68.23371 oW

Details of the instrumentation associated with the first deployment of the mooring at the RaTS site:

BODC image
Instrument Depth (m)
Teledyne RDI's Workhorse Long Ranger 75kHz ADCP (5125) 200
RBR XR-420 CTD (10822) 200
Sediment trap (11262-09) ~212
RBR TR-1050 (11410) ~234
RBR XR-420 CTD (10823) 253
RBR TDR-2050 (11768) 268
RBR XR-420 CTD (10824) 283
Sediment trap (11262-01) ~391

Figure of mooring and table of instruments with corresponding depths (Wallace, 2007)

Reference

Wallace, M.I., 2007. Ocean circulation, properties and variability in Marguerite Bay, west Antarctic Peninsula. PhD Thesis. The Open University, Milton Keynes, UK.

Other Series linked to this Data Activity - 775950 776210 776178 770644 776142

Cruise

Cruise Name JR20050124 (JR112, JR113)
Departure Date 2005-01-24
Arrival Date 2005-01-25
Principal Scientist(s)Mark Brandon (Open University Department of Earth and Environmental Sciences)
Ship RRS James Clark Ross

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