Metadata Report for BODC Series Reference Number 1979649
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
Data Description |
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Data Identifiers |
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Time Co-ordinates(UT) |
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Spatial Co-ordinates | |||||||||||||||||||||||||||||||||||||||||||||
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Parameters |
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Definition of BOTTFLAG | |||||||||||||||||||||||||||||||||||||||||||||
BOTTFLAG | Definition |
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0 | The sampling event occurred without any incident being reported to BODC. |
1 | The filter in an in-situ sampling pump physically ruptured during sample resulting in an unquantifiable loss of sampled material. |
2 | Analytical evidence (e.g. surface water salinity measured on a sample collected at depth) indicates that the water sample has been contaminated by water from depths other than the depths of sampling. |
3 | The feedback indicator on the deck unit reported that the bottle closure command had failed. General Oceanics deck units used on NERC vessels in the 80s and 90s were renowned for reporting misfires when the bottle had been closed. This flag is also suitable for when a trigger command is mistakenly sent to a bottle that has previously been fired. |
4 | During the sampling deployment the bottle was fired in an order other than incrementing rosette position. Indicative of the potential for errors in the assignment of bottle firing depth, especially with General Oceanics rosettes. |
5 | Water was reported to be escaping from the bottle as the rosette was being recovered. |
6 | The bottle seals were observed to be incorrectly seated and the bottle was only part full of water on recovery. |
7 | Either the bottle was found to contain no sample on recovery or there was no bottle fitted to the rosette position fired (but SBE35 record may exist). |
8 | There is reason to doubt the accuracy of the sampling depth associated with the sample. |
9 | The bottle air vent had not been closed prior to deployment giving rise to a risk of sample contamination through leakage. |
Definition of Rank |
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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
Technicon AutoAnalyzer II (AAII)
The AAII is a segmented flow analyzer used for automated colorimetric analysis. The apparatus uses 2 mm diameter glass tubing and pumps reagents at flow rates of 2 to 3 ml s-1, producing results at a typical rate of 30 to 60 samples per hour. The system comprises an autosampler, peristaltic pump, chemistry manifold a detector and a data acquisition software.
This instrument was replaced by the AA3 in 1997 which was upgraded to the AA3 HR systems in 2006.
Specifications
Frequency | 420 kHz |
Beam width | 1.8° at -3 dB |
Pulse lenght | 0.1 m |
Acoustic range precision | ± 2.5 cm |
Sampling rate | 1 Hz |
Tilt accuracy | ± 0.5° |
Tilt resolution | ± 0.01° |
Diameter of ensonified area | 0.9 m for 30 m range 3.1 m for 100 m range 6.3 m for 200 m range |
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 Dissolved Inorganic Nutrient Samples for CGS Project
Originator's Protocol for Data Acquisition and Analysis
Dissolved Inorganic Nutrient samples were taken from three Collaborative Gearing Scheme (CGS) stations during cruise JR15003, between 25th and 28th December 2015. Bottle samples were taken using Niskin bottles on a 24 way rosette sampler attached to an SBE 911plus CTD unit. Nutrient samples were filtered through 0.2 µm supor membrane filters. Nutrient samples were snap-frozen at -80°C and then stored at -20°C. Silicic acid samples were stored in the dark at 4°C. Prior to nutrient analysis, samples were thawed for 48 hours to ensure complete redissolution of secondary silicate precipitates to silicic acid. Concentrations of nitrate+nitrite, nitrite, ammonium, phosphate and silicic acid were analysed using a Technicon AAII segmented flow autoanalysis system with reference materials from KANSO Ltd (Japan) at Plymouth marine Laboratory, UK. Raw data were corrected to elemental standards and ambient ocean salinity and pH. Samples were assayed in duplicate and standard deviation was generally better than 0.2 µmol L-1 for nitrate+nitrite, 0.01 µmol L-1 for nitrite, 0.02 µmol L-1 for phosphate, and 0.6 µmol L-1 for silicic acid.
For more information please see the cruise report.
BODC Data Processing Procedures
The nutrient data were supplied to BODC in .xlsx 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:
Originator's Variable | Originator's Units | BODC Parameter Code | BODC Units | Comment |
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silicate | µmol/l | SLCAAAD5 | µmol/l | - |
ammonium | µmol/l | AMONAAD5 | µmol/l | - |
nitrite | µmol/l | NTRIAAD5 | µmol/l | - |
nitrate+nitrite | µmol/l | NTRZAAD5 | µmol/l | - |
phosphate | µmol/l | PHOSAAD5 | µmol/l | - |
Project Information
NE/K010034/1 Isotopic characterisation of nutrient dynamics and Upper Circumpolar Deep Water behaviour in the West Antarctic Peninsula sea ice environment
Introduction
Solo NERC funded grant, 'isotopic characterisation of nutrient dynamics and Upper Circumpolar Deep Water (UCDW) behaviour in the West Antarctic Peninsula sea ice environment' with grant reference NE/K010034/1. The project is led by Dr Sian Henley (University of Edinburgh, School of Geosciences).
Background and Objectives
The research project aims to examine ways in which ongoing climate change and sea ice decline at the West Antarctic Peninsula (WAP) are influencing nutrient budgets and biogeochemical cycling throughout the region. The WAP is an ecologically important region of high primary productivity, where nutrient cycling is known to be crucial to phytoplankton production and its relationship with carbon dioxide dynamics. The study comprises of three components:
- A time-series study over three austral summer growing seasons in Ryder Bay, WAP, to examine temporal changes in fixed nitrogen budgets and cycling, in relation to inter-annual variability in sea ice, water column structure and productivity.
- A ship-based transect from the shelf break to Marguerite Bay to examine deep-water behaviour and its impact on the supply of nutrients to high productivity coastal regions.
- Ship-based sampling across the wider WAP shelf region to examine spatial variability in nutrient dynamics, productivity, sea ice and physical oceanography, and give a broader context to the time-series study.
Fieldwork
Ship based sampling was completed on-board RRS James Clark Ross cruise JR20141231 (JR307, JR308) comprising of full depth CTDs, water sampling for analysis on-board for macro nutrient concentration and RNA sequencing of organic matter. Times Series, study data were collected as part of the Rothera Time Series (RaTS), a long-term monitoring project conducted by the British Antarctic Survey since 1997.
Data Availability
The NERC funded data collected under NE/K010034/1 is restricted to the Principal Investigator for 2 years from the point of data collection. Data is freely available to the public beyond this date.
Data Activity or Cruise Information
Data Activity
Start Date (yyyy-mm-dd) | 2015-12-28 |
End Date (yyyy-mm-dd) | 2015-12-28 |
Organization Undertaking Activity | National Oceanography Centre, Southampton |
Country of Organization | United Kingdom |
Originator's Data Activity Identifier | JR15003_CTD_CTD03 |
Platform Category | lowered unmanned submersible |
BODC Sample Metadata Report for JR15003_CTD_CTD03
Sample reference number | Nominal collection volume(l) | Bottle rosette position | Bottle firing sequence number | Minimum pressure sampled (dbar) | Maximum pressure sampled (dbar) | Depth of sampling point (m) | Bottle type | Sample quality flag | Bottle reference | Comments |
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1367489 | 12.00 | 1 | 1 | 383.00 | 383.00 | 378.80 | Niskin bottle | No problem reported | ||
1367492 | 12.00 | 2 | 2 | 382.90 | 383.00 | 378.80 | Niskin bottle | No problem reported | ||
1367495 | 12.00 | 3 | 3 | 303.50 | 303.60 | 300.30 | Niskin bottle | No problem reported | ||
1367498 | 12.00 | 4 | 4 | 303.50 | 303.60 | 300.30 | Niskin bottle | No problem reported | ||
1367501 | 12.00 | 6 | 6 | 253.10 | 253.10 | 250.40 | Niskin bottle | No problem reported | ||
1367504 | 12.00 | 7 | 7 | 202.40 | 202.50 | 200.30 | Niskin bottle | No problem reported | ||
1367507 | 12.00 | 8 | 8 | 202.40 | 202.50 | 200.30 | Niskin bottle | No problem reported | ||
1367510 | 12.00 | 9 | 9 | 162.30 | 162.40 | 160.70 | Niskin bottle | No problem reported | ||
1367513 | 12.00 | 10 | 10 | 162.30 | 162.40 | 160.70 | Niskin bottle | No problem reported | ||
1367516 | 12.00 | 11 | 11 | 132.10 | 132.20 | 130.80 | Niskin bottle | No problem reported | ||
1367519 | 12.00 | 13 | 13 | 101.90 | 101.90 | 100.90 | Niskin bottle | No problem reported | ||
1367522 | 12.00 | 14 | 14 | 101.90 | 101.90 | 100.90 | Niskin bottle | No problem reported | ||
1367525 | 12.00 | 15 | 15 | 71.10 | 71.20 | 70.40 | Niskin bottle | No problem reported | ||
1367528 | 12.00 | 16 | 16 | 71.10 | 71.20 | 70.40 | Niskin bottle | No problem reported | ||
1367531 | 12.00 | 17 | 17 | 41.20 | 41.30 | 40.80 | Niskin bottle | No problem reported | ||
1367534 | 12.00 | 19 | 19 | 26.20 | 26.30 | 26.00 | Niskin bottle | No problem reported | ||
1367537 | 12.00 | 20 | 20 | 26.20 | 26.30 | 26.00 | Niskin bottle | No problem reported | ||
1367540 | 12.00 | 21 | 21 | 15.00 | 15.10 | 14.90 | Niskin bottle | No problem reported | ||
1367543 | 12.00 | 22 | 22 | 15.00 | 15.00 | 14.80 | Niskin bottle | No problem reported | ||
1367546 | 12.00 | 23 | 23 | 5.00 | 5.10 | 5.00 | Niskin bottle | No problem reported | ||
1368527 | 12.00 | 5 | 5 | 253.10 | 253.10 | 250.40 | Niskin bottle | No problem reported | ||
1368530 | 12.00 | 12 | 12 | 132.10 | 132.20 | 130.80 | Niskin bottle | No problem reported | ||
1368533 | 12.00 | 18 | 18 | 41.20 | 41.30 | 40.80 | Niskin bottle | No problem reported | ||
1368536 | 12.00 | 24 | 24 | 5.00 | 5.10 | 5.00 | Niskin bottle | No problem reported |
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
Cruise Name | JR15003 |
Departure Date | 2015-12-17 |
Arrival Date | 2016-01-13 |
Principal Scientist(s) | Yvonne L Firing (National Oceanography Centre, Southampton) |
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 |
B | nominal value |
Q | value below limit of quantification |
Appendix 1: JR15003_CTD_CTD03
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.
Series Identifier | Data Category | Start date/time | Start position | Cruise |
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1979705 | Water sample data | 2015-12-28 10:21:58 | 67.8036 S, 68.8146 W | RRS James Clark Ross JR15003 |
1979674 | Water sample data | 2015-12-28 10:22:00 | 67.8036 S, 68.8146 W | RRS James Clark Ross JR15003 |