Metadata Report for BODC Series Reference Number 703607

Metadata Summary

Data Description
Data Category CTD or STD cast
Instrument Type
NameCategories
Neil Brown MK3 CTD  CTD; water temperature sensor; salinity sensor; dissolved gas sensors
Chelsea Technologies Group Alphatracka transmissometer  transmissometers
National Marine Facilities Microelectrode Oxygen Sensor  dissolved gas sensors
Instrument Mounting lowered unmanned submersible
Originating Country United Kingdom
Originator Dr Stuart Cunningham
Originating Organization Southampton Oceanography Centre (now National Oceanography Centre, Southampton)
Processing Status QC in progress
Project(s) WOCE
CLIVAR
 

Data Identifiers

Originator's Identifier CTD55030
BODC Series Reference 703607
 

Time Co-ordinates(UT)
Start Time (yyyy-mm-dd hh:mm) 2000-11-28 04:42
End Time (yyyy-mm-dd hh:mm) 2000-11-28 04:54
Nominal Cycle Interval 2.0 decibars
 

Spatial Co-ordinates

Latitude 60.98150 S ( 60° 58.9' S )
Longitude 54.62017 W ( 54° 37.2' W )
Positional Uncertainty Unspecified
Minimum Sensor Depth 0.0 m
Maximum Sensor Depth 577.7 m
Minimum Sensor Height 3.4 m
Maximum Sensor Height 581.1 m
Sea Floor Depth 581.1 m
Sensor Distribution Variable common depth - All sensors are grouped effectively at the same depth, but this depth varies significantly during the series
Sensor Depth Datum Instantaneous - Depth measured below water line or instantaneous water body surface
Sea Floor Depth Datum Instantaneous - Depth measured below water line or instantaneous water body surface
 

Parameters
BODC CODE Rank Units Title
ACYCAA01 1 Dimensionless Sequence number
CNCLCCI1 1 Siemens per metre Electrical conductivity of the water body by in-situ conductivity cell and calibration against independent measurements
OXYVLTN1 1 Volts Instrument output (voltage) by in-situ oxygen microelectrode
OXYVLTN2 1 Volts Instrument output (voltage) by in-situ oxygen microelectrode
PRESPR01 1 Decibars Pressure (spatial co-ordinate) exerted by the water body by profiling pressure sensor and corrected to read zero at sea level
PSALCC01 1 Dimensionless Practical salinity of the water body by CTD and computation using UNESCO 1983 algorithm and calibration against independent measurements
TEMPCC01 1 Degrees Celsius Temperature of the water body by CTD and verification against independent measurements
TVLTZZ01 1 Volts Instrument output (voltage) by transmissometer
 

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

CTD Oxygen Sensor Data

Trials were conducted of a new dissolved oxygen sensor designed by SOC and the University of Southampton Chemistry Department.

The trials showed up various issues that were to be considered ashore. In particular, flow rate, the robustness of manufacture and the up/down effects. Heavily-smoothed signals showed generally realistic variation with known climatological dissolved oxygen content.

Further information on the sensor can be found in the Cruise Report p.52.

Quality Report

Two CTDs were used during the cruise, DEEP03 and DEEP04.
DEEP03 was used for stations 1-18, 21-22 and 33-34.
DEEP04 was used for stations 19-20 and 23-32.

Stations 001-018 were completed using DEEP03 (conductivity cell s/n L53)
Bottle - CTD conductivities had a large systematic station by station drift, such that the CTD was reading higher conductivities on subsequent stations. On stations 016-018 upcast salinities were higher than on downcast and the downcast temperature/salinity (T/S) had a different shape to the upcast T/S.

Stations 019 and 020 were completed using DEEP04.
For both stations the upcast was saltier and had a different T/S shape relative to the downcast.

Stations 021 and 022 were completed using DEEP03 with a new conductivity cell (s/n Q47).
Both stations showed a large drift to fresher salinities throughout the casts, possibly related to the new cell.

Stations 023 to 032 were completed using DEEP04.
Behaviour seemed to have settled so that down and upcasts had the same T/S shape.

Stations 033 and 034 were completed using DEEP03 (with conductivity cells s/n Q47 and s/n G149).
Profiles had large salinity drifts to fresher salinities.

Temperature

Post-cruise calibration revealed that the difference in temperatures measured by DEEP03 and DEEP04 was consistent with a DEEP03 drift. Therefore, DEEP03 temperature data needed to be offset by +0.006°C.

It is not apparent whether the temperature correction has been applied to the data.

Salinity

The salinity was calibrated to bottles and therefore did not require adjustment for the temperature offset

Transmittance

For stations 1, 3-7, 9-17, 19-20, 23-26, 28-34 the transmittance values were very noisy in places, with data spikes of different sizes. Only the large data spikes were flagged.

Full details of the quality issues relating to the CTD can be found in the Cruise Report.

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

National Marine Facilities Microelectrode Oxygen Sensor

The Microelectrode Oxygen Sensor is a non-membrane dissolved oxygen sensor developed by the Ocean Engineering Division of National Marine Facilities (NMF) at the National Oceanography Centre, and the Electro-Chemistry Group at the University of Southampton Chemistry Department. The sensor is suitable for marine applications. It was first used in 2000 and development is ongoing.

The fundamental parts of the sensor are a platinum microelectrode and a counter electrode (thus far composed of copper). A measurement potential is applied to the microelectrode relative to the counter electrode. This leads to reduction of dissolved oxygen at the microelectrode and produces a current proportional to the number of oxygen molecules at that electrode.

The sensor is suitable for operation on a CTD system as it is free from the pressure effects (e.g. slow response, drift and hysteresis) typically encountered when using oxygen sensors that employ a membrane. Its short response time (approximately 1 second) also makes it suitable for deployment on CTDs and oceanographic undulators. The sensor includes both analogue voltage and serial digital (RS 232) outputs.

The electrode surface is reconditioned by applying a cleaning potential to the microelectrode at which oxidation occurs. This minimises drift and the effects of bio-fouling.

Ongoing development

Early versions of the instrument applied the measurement potential for up to 30 seconds, with sampling starting approximately one second after the potential was applied. The sensor response to oxygen remained almost constant for a given concentration and data could be sampled at frequencies exceeding 1 Hz.

However, the sensor proved to be very sensitive to fluctuations in flow, leading to apparent noise in the data. In an attempt to address this, various changes were made to the functionality:

Instrument Descriptions

CTD Unit and Auxiliary Sensors

Instrument Manufacturer Model Serial number Last calibration date Comments
CTD Neil Brown MkIIIc DEEP03 August 2000 -
DEEP04 September 2000 -
Transmissometer Chelsea Instruments unknown 161/2602/003 - -
Altimeter Simrad 200m range - - -
Thermometer SIS unknown T1684 August/September 2000 -
T1545 August/September 2000 -
Pressure Meter SIS unknown P6571 August/September 2000 -
P6394 August/September 2000 -
Oxygen Sensor Southampton Oceanography
Centre and the University
of Southampton		 Experimental
Sensor		 E50* n/a Stations 001-011 (DEEP03)
F50* n/a Stations 012-014 (DEEP03)
B10* n/a Stations 015-016 (DEEP03)
D50* n/a Stations 017-018 (DEEP03)
C10* n/a Stations 019-020 (DEEP04) and 021 (DEEP03)
G10* n/a Stations 022 (DEEP03) and 023-024 (DEEP04)
A50* n/a Stations 025-032 (DEEP04)
B10* n/a Stations 033-034 (DEEP03)

* See the Cruise Report p. 52-55 for more details on the Oxygen Sensor.

Neil Brown MK3 CTD

The Neil Brown MK3 conductivity-temperature-depth (CTD) profiler consists of an integral unit containing pressure, temperature and conductivity sensors with an optional dissolved oxygen sensor in a pressure-hardened casing. The most widely used variant in the 1980s and 1990s was the MK3B. An upgrade to this, the MK3C, was developed to meet the requirements of the WOCE project.

The MK3C includes a low hysteresis, titanium strain gauge pressure transducer. The transducer temperature is measured separately, allowing correction for the effects of temperature on pressure measurements. The MK3C conductivity cell features a free flow, internal field design that eliminates ducted pumping and is not affected by external metallic objects such as guard cages and external sensors.

Additional optional sensors include pH and a pressure-temperature fluorometer. The instrument is no longer in production, but is supported (repair and calibration) by General Oceanics.

Specifications

These specification apply to the MK3C version.

Pressure Temperature Conductivity
Range

6500 m

3200 m (optional)

 -3 to 32°C 1 to 6.5 S cm-1
Accuracy

0.0015% FS

0.03% FS < 1 msec

0.0005°C

0.003°C < 30 msec

0.0001 S cm-1

0.0003 S cm-1 < 30 msec

Further details can be found in the specification sheet.

Chelsea Technologies Group ALPHAtracka and ALPHAtracka II transmissometers

The Chelsea Technologies Group ALPHAtracka (the Mark I) and its successor, the ALPHAtracka II (the Mark II), are both accurate (< 0.3 % fullscale) transmissometers that measure the beam attenuation coefficient at 660 nm. Green (565 nm), yellow (590 nm) and blue (470 nm) wavelength variants are available on special order.

The instrument consists of a Transmitter/Reference Assembly and a Detector Assembly aligned and spaced apart by an open support frame. The housing and frame are both manufactured in titanium and are pressure rated to 6000 m depth.

The Transmitter/Reference housing is sealed by an end cap. Inside the housing an LED light source emits a collimated beam through a sealed window. The Detector housing is also sealed by an end cap. A signal photodiode is placed behind a sealed window to receive the collimated beam from the Transmitter.

The primary difference between the ALPHAtracka and ALPHAtracka II is that the Alphatracka II is implemented with surface-mount technology; this has enabled a much smaller diameter pressure housing to be used while retaining exactly the same optical train as in the Mark I. Data from the Mark II version are thus fully compatible with that already obtained with the Mark I. The performance of the Mark II is further enhanced by two electronic developments from Chelsea Technologies Group - firstly, all items are locked in a signal nulling loop of near infinite gain and, secondly, the signal output linearity is inherently defined by digital circuitry only.

Among other advantages noted above, these features ensure that the optical intensity of the Mark II, indicated by the output voltage, is accurately represented by a straight line interpolation between a reading near full-scale under known conditions and a zero reading when blanked off.

For optimum measurements in a wide range of environmental conditions, the Mark I and Mark II are available in 5 cm, 10 cm and 25 cm path length versions. Output is default factory set to 2.5 volts but can be adjusted to 5 volts on request.

Further details about the Mark II instrument are available from the Chelsea Technologies Group ALPHAtrackaII specification sheet.

BODC Processing

The data arrived at BODC as Pstar files, representing all of the CTD casts taken during the cruise. These were reformatted to the internal QXF format. The following table shows how the variables were mapped to the appropriate BODC parameter codes.

Originator's
variable		 Units Description BODC
Parameter
code		 Units Comments
Pressure dbar Pressure exerted by the water column PRESPR01 dbar Calibrated by originator.
Temperature °C Temperature of the water column TEMPCC01 °C Calibrated by originator.
Potential Temperature °C - - - Derived parameter, not retained by BODC
Salinity psu Practical salinity of the water column PSALCC01 psu Calibrated against bottle data, by Originator
Conductivity mmho/cm Electrical conductivity of the water body by in-situ conductivity cell and calibration against independent measurements CNCLCCI1 S m-1 Calibrated against bottle data, by Originator
Transmittance volts Instrument output (voltage) by transmissometer TVLTZZ01 volts Calibrated by originator.
Altimetry m Height above bed in the water column - - Not retained by BODC, as it is a duplicate vertical co-ordinate, of lower resolution than pressure.
Dissolved oxygen volts Instrument output (voltage) by in-situ oxygen microelectrode OXYVLTN1 volts Trials of a new sensor
Dissolved oxygen volts Instrument output (voltage) by in-situ oxygen microelectrode OXYVLTN2 volts Trials of a new sensor

The reformatted data were visualised using the in-house EDSERPLO software. Suspect data were marked by adding an appropriate quality control flag.

Originator's Data Processing

Sampling Strategy

A total of 34 full depth CTD stations were completed during JR55. Salinity samples were drawn on all of the stations for calibrating the CTD.

Data Processing

Raw CTD data were captured and stored to the hard disk of the CTD acquisition PC. These data were also recorded directly from the CTD deck unit onto the SOC DAPS (Data Acquisition Processing Software) system. DAPS used routines for one second despiking and averaging of the raw 25Hz data.

DAPS stored two ASCII files for each cast, one for CTD data and another for the bottle firing data.

Nearing the end of JR55, frequent "data time outs" and "frame sync errors" for CTD led to data loss for some of the casts in the DAPS ASCII files.

Field calibrations

A description of the CTD calibrations applied to each instrument are described below.

Temperature

Temperatures were reported in ITS-90.

Raw temperatures were scaled according to:

then calibrated using the coefficients provided by Ocean Scientific International (OSI) for DEEP03 and DEEP04,

Due to a lag between the conductivity and temperature sensor measurements the time rate of change of temperature was used to "speed up" the temperature measurements according to,

where the rate of change of temperature is determined over a one second interval. Estimates of τ from Cunningham (2000) were used.

Pressure

Raw pressure measurements were first scaled according to:

then calibrated using the coefficients provided by Ocean Scientific International (OSI) for DEEP03 and DEEP04,

Following observations of pressure before and after each cast for DEEP03 and DEEP04 it was evident that a correction was required to set pressure readings to zero. The adjustments made were-1.8 dbar and -7.6 dbar for DEEP03 and DEEP04 respectively, changing the above coefficients to

The offset was determined by taking the mean pressure values before entering the water and on deck after each cast and calculating the mean pressure. The mean pressure was used to adjust the pressure offset. No relationship between pressure offset and temperature was found.

Salinity

Raw conductivities were scaled according to:

then calibrated using the coefficients provided by Ocean Scientific International (OSI) for DEEP03 and DEEP04,

This was followed by the cell material deformation correction

where the coefficients for the cell material are: α = -6.5E-6°C-1 , β = 1.5E-8dbar-1 , T0 = 15°C and P0 = 0dbar.

Further adjustments to the conductivity offsets were determined using bottle samples. See the Cruise Report (Cunningham, 2001) for further details.

Transmittance and Altimetry

Transmittance was converted to voltages; this is a calibration of the voltage digitiser in the ctd.

The altimeter had the following calibration applied

References

Cunningham, S.A. (2000) RRS Discovery Cruise 242, 07 Sep-06 Oct 1999. Atlantic - Norwegian Exchanges. Southampton, UK, Southampton Oceanography Centre, 128pp.
Cunningham, S.A. (2001) RRS James Clark Ross Cruise JR55, 21 Nov-14 Dec 2000. Drake Passage repeat hydrography: WOCE Southern Section 1b - Burdwood Bank to Elephant Island. Southampton, UK, Southampton Oceanography Centre, 75pp.

Project Information

World Ocean Circulation Experiment (WOCE)

The World Ocean Circulation Experiment (WOCE) was a major international experiment which made measurements and undertook modelling studies of the deep oceans in order to provide a much improved understanding of the role of ocean circulation in changing and ameliorating the Earth's climate.

WOCE had two major goals:

Climate Variability and Predictability (CLIVAR)

CLIVAR is an international research programme investigating climate variability and predictability on different time-scales and the response of the climate system to anthropogenic forcing. Climate variability, its extremes and possible future changes, has a strong impact on mankind. CLIVAR seeks to better understand and predict our climate in order to take precautions and to reduce impacts of climate variability and change on our planet. CLIVAR is one of the major components of the World Climate Research Programme (WCRP). It started in 1995 and will have a lifetime of 15 years.

The specific objectives of CLIVAR are:

Further information may be obtained from the Official CLIVAR Project web site and theBODC web site

Data Activity or Cruise Information

Cruise

Cruise Name JR20001121 (JR55)
Departure Date 2000-11-21
Arrival Date 2000-12-14
Principal Scientist(s)Stuart A Cunningham (Southampton Oceanography Centre)
Ship RRS James Clark Ross

Complete Cruise Metadata Report is available here

Fixed Station Information

Fixed Station Information

Station NameDrake Passage - WOCE SR1b
CategoryOffshore route/traverse

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).

Cruise Country Start Date End Date
R/V Polarstern ANT 10-5 Germany 08-08-1992 26-09-1992
RRS Discovery D198 United Kingdom 11-11-1992 17-12-1992
RRS James Clark Ross JR0a United Kingdom 20-11-1993 18-12-1993
RRS James Clark Ross JR0b United Kingdom 13-11-1994 30-11-1994
R/V Hespérides 29HE19951203 Spain 03-12-1995 06-01-1996
R/V Hespérides 29HE19960117 Spain 17-01-1996 05-02-1996
RRS James Clark Ross JR16 United Kingdom 13-11-1996 07-12-1996
RRS James Clark Ross JR27 United Kingdom 17-12-1997 08-01-1998
R/V Hespérides 29HE19980730 Spain 27-07-1998 27-08-1998
RRS James Clark Ross JR47 United Kingdom 13-01-2000 17-02-2000
RRS James Clark Ross JR55 United Kingdom 21-11-2000 14-12-2000
RRS James Clark Ross JR67 United Kingdom 19-11-2001 17-12-2001
RRS James Clark Ross JR81 United Kingdom 18-12-2002 02-01-2003
RRS James Clark Ross JR94 United Kingdom 28-11-2003 16-12-2003
RRS James Clark Ross JR115 United Kingdom 01-12-2004 19-12-2004
RRS James Clark Ross JR139 United Kingdom 05-12-2005 12-12-2005
RRS James Clark Ross JR163 United Kingdom 06-12-2006 15-12-2006
RRS James Clark Ross JR193 United Kingdom 29-11-2007 08-12-2007
RRS James Clark Ross JR194 United Kingdom 12-12-2008 20-12-2008
RRS James Cook JC031 United Kingdom 03-02-2009 03-03-2009
RRS James Clark Ross JR195 United Kingdom 19-11-2009 26-11-2009
RRS James Clark Ross JR242 United Kingdom 06-12-2010 18-12-2000
RRS James Clark Ross JR276 United Kingdom 09-04-2011 26-04-2011
RRS James Clark Ross JR265 and JR254D United Kingdom 27-11-2011 24-12-2011

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.

Other Series linked to this Fixed Station for this cruise - 703287 703299 703306 703318 703331 703343 703355 703367 703379 703380 703392 703411 703423 703435 703447 703459 703460 703472 703484 703496 703503 703515 703527 703539 703540 703552 703564 703576 703588 703619

Other Cruises linked to this Fixed Station (with the number of series) - JC031 (105) JR19931120 (JR00a) (30) JR19941113 (JR0B) (29) JR19961128 (JR16) (29) JR19971217 (JR27) (54) JR20000113 (JR47) (29) JR20001121 (JR55) (30) JR20021224 (JR81) (32) JR20031211 (JR94) (30) JR20041201 (JR111, JR115) (35) JR20071129 (JR171, JR193, JR196, JR212) (32) JR20081212 (JR194, JR197) (30) JR20091118 (JR195, JR198) (33) JR20101205 (JR242) (9) JR20110409 (JR276) (15)

Fixed Station Information

Station NameDrake Passage
CategoryOffshore area
Latitude59° 0.00' S
Longitude62° 0.00' W
Water depth below MSL

Drake Passage

The World Ocean Circulation Experiment (WOCE, 1990-1998) was a major international experiment which made measurements and undertook modelling studies of the deep oceans in order to provide a much improved understanding of the role of ocean circulation in changing and ameliorating the Earth's climate.

The Drake Passage is the narrowest constriction of the Antarctic Circumpolar Current (ACC) - the largest current in the world and connects all three major oceanic basins both horizontally and vertically, thus being a key control in the global overturning circulation.Within the Drake Passage, two repeat hydrographic sections (SR1 and SR1b) were established by WOCE. These were designed to extend measurements collected earlier by the International Southern Ocean Studies (ISOS) programme and have continued beyond the WOCE time-frame.

The original section was SR1 (which also covers part of the A21 one time survey track). Subsequently, the section was shifted to the east (and designated SR1b) in order for it to lie on a satellite ground track as illustrated in the image below.

BODC image

In addition to the hydrographic measurements, UK research in Drake Passage also includes a network of coastal and deep tide gauges, analysis of satellite altimeter data, and state-of-the-art global numerical modeling.

Other Series linked to this Fixed Station for this cruise - 703287 703299 703306 703318 703331 703343 703355 703367 703379 703380 703392 703411 703423 703435 703447 703459 703460 703472 703484 703496 703503 703515 703527 703539 703540 703552 703564 703576 703588 703619 703620

Other Cruises linked to this Fixed Station (with the number of series) - JC031 (247) JC054 (18) JR19931120 (JR00a) (30) JR19941113 (JR0B) (29) JR19961128 (JR16) (29) JR20000113 (JR47) (29) JR20001121 (JR55) (31) JR20021224 (JR81) (32) JR20031211 (JR94) (30) JR20041201 (JR111, JR115) (35) JR20050124 (JR112, JR113) (13) JR20060216 (JR136, JR137) (6) JR20071129 (JR171, JR193, JR196, JR212) (32) JR20091118 (JR195, JR198) (33) JR20101205 (JR242) (9) JR20110409 (JR276) (15) RATS/CTD100 (1) RATS/CTD103 (1) RATS/CTD106 (1) RATS/CTD108 (1) RATS/CTD111 (1) RATS/CTD113 (1) RATS/CTD115 (1) RATS/CTD120 (1) RATS/CTD122 (1) RATS/CTD124 (1) RATS/CTD126 (1) RATS/CTD129 (1) RATS/CTD131 (1) RATS/CTD133 (1) RATS/CTD136 (1) RATS/CTD138 (1) RATS/CTD140 (1) RATS/CTD142 (1) RATS/CTD145 (1) RATS/CTD147 (1) RATS/CTD150 (1) RATS/CTD151 (1) RATS/CTD153 (1) RATS/CTD154 (1) RATS/CTD156 (1) RATS/CTD157 (1) RATS/CTD160 (1) RATS/CTD163 (1) RATS/CTD164 (1) RATS/CTD166 (1) RATS/CTD167 (1) RATS/CTD169 (1) RATS/CTD170 (1) RATS/CTD173 (1) RATS/CTD175 (1) RATS/CTD177 (1) RATS/CTD180 (1) RATS/CTD182 (1) RATS/CTD184 (1) RATS/CTD186 (1) RATS/CTD189 (1) RATS/CTD191 (1) RATS/CTD193 (1) RATS/CTD195 (1) RATS/CTD198 (1) RATS/CTD200 (1) RATS/CTD202 (1) RATS/CTD204 (1) RATS/CTD206 (1) RATS/CTD208 (1) RATS/CTD210 (1) RATS/CTD214 (1) RATS/CTD217 (1) RATS/CTD219 (1) RATS/CTD221 (1) RATS/CTD223 (1) RATS/CTD225 (1) RATS/CTD227 (1) RATS/CTD230 (1) RATS/CTD232 (1) RATS/CTD234 (1) RATS/CTD237 (1) RATS/CTD239 (1) RATS/CTD241 (1) RATS/CTD243 (1) RATS/CTD245 (1) RATS/CTD247 (1) RATS/CTD249 (1) RATS/CTD251 (1) RATS/CTD254 (1) RATS/CTD256 (1) RATS/CTD258 (1) RATS/CTD260 (1) RATS/CTD262 (1) RATS/CTD265 (1) RATS/CTD267 (1) RATS/CTD269 (1) RATS/CTD271 (1) RATS/CTD273 (1) RATS/CTD275 (1) RATS/CTD277 (1) RATS/CTD281 (1) RATS/CTD283 (1) RATS/CTD285 (1) RATS/CTD287 (1) RATS/CTD289 (1) RATS/CTD291 (1) RATS/CTD293 (1) RATS/CTD295 (1) RATS/CTD297 (1) RATS/CTD301 (1) RATS/CTD305 (1) RATS/CTD307 (1) RATS/CTD309 (1) RATS/CTD311 (1) RATS/CTD313 (1) RATS/CTD315 (1) RATS/CTD317 (1) RATS/CTD319 (1) RATS/CTD321 (1) RATS/CTD323 (1) RATS/CTD325 (1) RATS/CTD327 (1) RATS/CTD329 (1) RATS/CTD331 (1) RATS/CTD335 (1) RATS/CTD337 (1) RATS/CTD341 (1) RATS/CTD343 (1) RATS/CTD345 (1) RATS/CTD347 (1) RATS/CTD351 (1) RATS/CTD353 (1) RATS/CTD355 (1) RATS/CTD357 (1) RATS/CTD361 (1) RATS/CTD363 (1) RATS/CTD365 (1) RATS/CTD373 (1) RATS/CTD375 (1) RATS/CTD377 (1) RATS/CTD379 (1) RATS/CTD381 (1) RATS/CTD383 (1) RATS/CTD385 (1) RATS/CTD387 (1) RATS/CTD389 (1) RATS/CTD395 (1) RATS/CTD397 (1) RATS/CTD399 (1) RATS/CTD401 (1) RATS/CTD403 (1) RATS/CTD405 (1) RATS/CTD407 (1) RATS/CTD409 (1) RATS/CTD411 (1) RATS/CTD415 (1) RATS/CTD417 (1) RATS/CTD419 (1) RATS/CTD423 (1) RATS/CTD425 (1) RATS/CTD427 (1) RATS/CTD429 (1) RATS/CTD43 (1) RATS/CTD431 (1) RATS/CTD433 (1) RATS/CTD437 (1) RATS/CTD439 (1) RATS/CTD443 (1) RATS/CTD445 (1) RATS/CTD461 (1) RATS/CTD463 (1) RATS/CTD465 (1) RATS/CTD467 (1) RATS/CTD469 (1) RATS/CTD471 (1) RATS/CTD473 (1) RATS/CTD475 (1) RATS/CTD477 (1) RATS/CTD479 (1) RATS/CTD481 (1) RATS/CTD483 (1) RATS/CTD485 (1) RATS/CTD487 (1) RATS/CTD489 (1) RATS/CTD49 (1) RATS/CTD491 (1) RATS/CTD493 (1) RATS/CTD495 (1) RATS/CTD497 (1) RATS/CTD499 (1) RATS/CTD501 (1) RATS/CTD503 (1) RATS/CTD505 (1) RATS/CTD507 (1) RATS/CTD509 (1) RATS/CTD51 (1) RATS/CTD511 (1) RATS/CTD513 (1) RATS/CTD515 (1) RATS/CTD517 (1) RATS/CTD519 (1) RATS/CTD521 (1) RATS/CTD523 (1) RATS/CTD525 (1) RATS/CTD527 (1) RATS/CTD529 (1) RATS/CTD53 (1) RATS/CTD531 (1) RATS/CTD534 (1) RATS/CTD536 (1) RATS/CTD538 (1) RATS/CTD540 (1) RATS/CTD542 (1) RATS/CTD545 (1) RATS/CTD547 (1) RATS/CTD549 (1) RATS/CTD55 (1) RATS/CTD551 (1) RATS/CTD553 (1) RATS/CTD555 (1) RATS/CTD557 (1) RATS/CTD559 (1) RATS/CTD561 (1) RATS/CTD563 (1) RATS/CTD565 (1) RATS/CTD567 (1) RATS/CTD569 (1) RATS/CTD571 (1) RATS/CTD573 (1) RATS/CTD575 (1) RATS/CTD577 (1) RATS/CTD579 (1) RATS/CTD58 (1) RATS/CTD581 (1) RATS/CTD583 (1) RATS/CTD585 (1) RATS/CTD587 (1) RATS/CTD589 (1) RATS/CTD591 (1) RATS/CTD593 (1) RATS/CTD595 (1) RATS/CTD597 (1) RATS/CTD599 (1) RATS/CTD60 (1) RATS/CTD601 (1) RATS/CTD603 (1) RATS/CTD605 (1) RATS/CTD607 (1) RATS/CTD609 (1) RATS/CTD611 (1) RATS/CTD613 (1) RATS/CTD615 (1) RATS/CTD617 (1) RATS/CTD619 (1) RATS/CTD62 (1) RATS/CTD621 (1) RATS/CTD623 (1) RATS/CTD625 (1) RATS/CTD627 (1) RATS/CTD629 (1) RATS/CTD631 (1) RATS/CTD633 (1) RATS/CTD635 (1) RATS/CTD637 (1) RATS/CTD639 (1) RATS/CTD64 (1) RATS/CTD654 (1) RATS/CTD66 (1) RATS/CTD669 (1) RATS/CTD678 (1) RATS/CTD68 (1) RATS/CTD687 (1) RATS/CTD695 (1) RATS/CTD70 (1) RATS/CTD705 (1) RATS/CTD72 (1) RATS/CTD722 (1) RATS/CTD724 (1) RATS/CTD727 (1) RATS/CTD729 (1) RATS/CTD731 (1) RATS/CTD733 (1) RATS/CTD735 (1) RATS/CTD737 (1) RATS/CTD739 (1) RATS/CTD74 (1) RATS/CTD741 (1) RATS/CTD743 (1) RATS/CTD745 (1) RATS/CTD747 (1) RATS/CTD749 (1) RATS/CTD751 (1) RATS/CTD753 (1) RATS/CTD755 (1) RATS/CTD757 (1) RATS/CTD759 (1) RATS/CTD761 (1) RATS/CTD763 (1) RATS/CTD765 (1) RATS/CTD767 (1) RATS/CTD77 (1) RATS/CTD771 (1) RATS/CTD773 (1) RATS/CTD775 (1) RATS/CTD777 (1) RATS/CTD779 (1) RATS/CTD781 (1) RATS/CTD783 (1) RATS/CTD785 (1) RATS/CTD787 (1) RATS/CTD789 (1) RATS/CTD795 (1) RATS/CTD797 (1) RATS/CTD799 (1) RATS/CTD80 (1) RATS/CTD801 (1) RATS/CTD803 (1) RATS/CTD805 (1) RATS/CTD807 (1) RATS/CTD809 (1) RATS/CTD811 (1) RATS/CTD813 (1) RATS/CTD817 (1) RATS/CTD819 (1) RATS/CTD82 (1) RATS/CTD821 (1) RATS/CTD823 (1) RATS/CTD825 (1) RATS/CTD827 (1) RATS/CTD829 (1) RATS/CTD831 (1) RATS/CTD833 (1) RATS/CTD837 (1) RATS/CTD839 (1) RATS/CTD84 (1) RATS/CTD841 (1) RATS/CTD843 (1) RATS/CTD845 (1) RATS/CTD847 (1) RATS/CTD849 (1) RATS/CTD851 (1) RATS/CTD853 (1) RATS/CTD855 (1) RATS/CTD857 (1) RATS/CTD859 (1) RATS/CTD861 (1) RATS/CTD863 (1) RATS/CTD865 (1) RATS/CTD867 (1) RATS/CTD869 (1) RATS/CTD87 (1) RATS/CTD871 (1) RATS/CTD873 (1) RATS/CTD879 (1) RATS/CTD881 (1) RATS/CTD883 (1) RATS/CTD885 (1) RATS/CTD887 (1) RATS/CTD889 (1) RATS/CTD89 (1) RATS/CTD891 (1) RATS/CTD893 (1) RATS/CTD895 (1) RATS/CTD897 (1) RATS/CTD899 (1) RATS/CTD901 (1) RATS/CTD903 (1) RATS/CTD905 (1) RATS/CTD907 (1) RATS/CTD909 (1) RATS/CTD91 (1) RATS/CTD913 (1) RATS/CTD915 (1) RATS/CTD917 (1) RATS/CTD919 (1) RATS/CTD921 (1) RATS/CTD923 (1) RATS/CTD925 (1) RATS/CTD927 (1) RATS/CTD929 (1) RATS/CTD93 (1) RATS/CTD931 (1) RATS/CTD933 (1) RATS/CTD935 (1) RATS/CTD937 (1) RATS/CTD939 (1) RATS/CTD941 (1) RATS/CTD943 (1) RATS/CTD945 (1) RATS/CTD947 (1) RATS/CTD949 (1) RATS/CTD951 (1) RATS/CTD953 (1) RATS/CTD955 (1) RATS/CTD957 (1) RATS/CTD959 (1) RATS/CTD96 (1) RATS/CTD961 (1) RATS/CTD963 (1) RATS/CTD965 (1) RATS/CTD967 (1) RATS/CTD969 (1) RATS/CTD971 (1) RATS/CTD973 (1) RATS/CTD975 (1) RATS/CTD977 (1) RATS/CTD979 (1) RATS/CTD98 (1) RATS/CTD981 (1) RATS/CTD983 (1) RATS/CTD985 (1) RATS/CTD987 (1) RATS/CTD989 (1) RATS/CTD991 (1)

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