Metadata Report for BODC Series Reference Number 1196700


Metadata Summary

Data Description

Data Category Offshore sea floor pressure series
Instrument Type
NameCategories
Sea-Bird SBE 53 BPR Bottom Pressure Recorder  sea level recorders; water temperature sensor
Instrument Mounting fixed benthic node
Originating Country United States
Originator Prof Bill Johns
Originating Organization Rosenstiel School of Marine and Atmospheric Science
Processing Status banked
Project(s) MOCHA
 

Data Identifiers

Originator's Identifier 3MOCHABL/417
BODC Series Reference 1196700
 

Time Co-ordinates(UT)

Start Time (yyyy-mm-dd hh:mm) 2008-04-25 03:00
End Time (yyyy-mm-dd hh:mm) 2010-11-30 10:00
Nominal Cycle Interval 900.0 seconds
 

Spatial Co-ordinates

Latitude 26.49883 N ( 26° 29.9' N )
Longitude 76.49400 W ( 76° 29.6' W )
Positional Uncertainty 0.05 to 0.1 n.miles
Minimum Sensor Depth 4840.0 m
Maximum Sensor Depth 4840.0 m
Minimum Sensor Height 1.0 m
Maximum Sensor Height 1.0 m
Sea Floor Depth 4841.0 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 Approximate - Depth is only approximate
Sea Floor Depth Datum Approximate - Depth is only approximate
 

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
PRSTDR01 1 Decibars DriftCorrTotPress Pressure (measured variable) exerted by the water body plus atmosphere by fixed in-situ pressure sensor and correction for drift
PRSTPS01 1 Decibars TotPressSeaFL Pressure (measured variable) exerted by the water body plus atmosphere by fixed in-situ pressure sensor
PRSTRS01 1 Decibars NonTidalResidual Pressure (residual) exerted by the water body plus atmosphere by fixed in-situ pressure sensor and subtraction of value predicted by tidal analysis
TEMPPR01 1 Degrees Celsius Temp Temperature of the water body
 

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

Sea-Bird SBE 53 BPR Bottom Pressure Recorder

The SBE 53 BPR is a water level recorder that boasts extremely high resolution,accuracy and stability. It combines a digiquartz pressure sensor, precision thermometer and optional conductivity sensor.

A description and specification of the instrument can be found in the manufacturer's datasheet .

RAPIDMOC Calibration Coefficients

Instrument Serial number 0417
Deployment cruise SJ08-03-2
Recovery cruise RB10-09

Processing Log

purge_bp_003.m: Pressure offset of 8.89 dbar removed
purge_bp_003.m: 1 spikes removed

Exponential-linear pressure fit to be stored with data:
amplitude of exponential decay: -0.413286 db
time-constant of exponential decay: 823.744692 days
linear slope: 0.000140 db/day
mean offset: 4929.136395 db

RAPIDMOC/MOCHA Sea-Bird BPR data processing document

This document outlines the procedures undertaken to process and quality assure the BPR data collected under the RAPIDMOC and MOCHA projects.

Originator's processing

The raw data are downloaded from the instrument and converted to ASCII format. All processing is performed in Matlab.

Processing

Processing steps which are undertaken include

Quality control

All variables in specified time intervals can be set to dummy values if the data are suspicious. Any data deemed as suspicious, i.e. a spike, are removed.

BODC processing

Data are received after quality checks have been made and calibrations have been applied by the originator. The data files are submitted in ASCII format as two files per instrument.

Once the submitted data files are safely archived, the data undergo reformatting and banking procedures:

Parameter mapping

The following describes the parameters contained in the originator's files and their mapping to BODC parameter codes:

File extension Identifier Unit Definition BODC parameter code Units Unit conversion Comments
use YY year Year AADYAA01 days - Combined with MM and DD to form a date and transferred
use MM month Month AADYAA01 days - Combined with MM and DD to form a date and transferred
use DD day Day AADYAA01 days - Combined with MM and DD to form a date and transferred
use HH hour Decimal hours AAFDZZ01 days /24 Transferred
use P decibars Pressure PRSTPS01 decibars - Transferred
use T °C Temperature (IPTS-90) TEMPPR01 °C - Transferred
use PFIT decibars Exponential-linear or pure linear trend of pressure (decibars). - - - See Parameter derivation table below
seagauge YY year Year AADYAA01 days - Combined with MM and DD to form a date and transferred
seagauge MM month Month AADYAA01 days - Combined with MM and DD to form a date and transferred
seagauge DD day Day AADYAA01 days - Combined with MM and DD to form a date and transferred
seagauge HH hour Decimal hours AAFDZZ01 days /24 Transferred
seagauge P decibars Pressure residual after drift removal and 2-day low pass filtering i.e. tides removed PRSTRS01 decibars - 12 hour resolution, transferred
seagauge T °C Temperature (IPTS-90) - - - Not transferred as use file contains higher resolution
seagauge PFIT decibars Harmonic fit of the fortnightly and monthly tides (decibars) - - - Not transferred as only a tidal prediction

Parameter derivation

The following describes the parameters derived by BODC and their mapping to BODC parameter codes:

BODC parameter code Units File extension Identifier Definition Units Equation Comments
PRSTDR01 decibars use
use

P
PFIT

Pressure
Exponential-linear or pure linear trend of pressure.
decibars
decibars

P-PFIT pressure series that is de-trended and unfiltered i.e. still contains tides

Project Information

Meridional Overturning Circulation and Heatflux Array (MOCHA) Project

Introduction

Users of these data are referred to the Meridional Overturning Circulation and Heatflux Array (MOCHA) Project Website for more information. The following text has been taken from the website.

Scientific Rationale

To set in place a system for continuous observation of the meridional heat transport in the subtropical Atlantic, with which to document its variability and its relationship to oberved climate fluctuations, and to assess climate model predictions

Overview

MOCHA is a collaborative project, partnered with the UK RAPID Program, to measure the heat and freshwater transports of the North Atlantic Ocean. These transports are called the Thermohaline or Overturning Circulation. Simply put, warm waters move poleward at the surface of the ocean, where they cool and sink, to return equatorward in the deep ocean.


Data Activity or Cruise Information

Data Activity

Start Date (yyyy-mm-dd) 2008-04-24
End Date (yyyy-mm-dd) 2010-11-30
Organization Undertaking ActivityRosenstiel School of Marine and Atmospheric Science
Country of OrganizationUnited States
Originator's Data Activity IdentifierWB3L3_3
Platform Categoryfixed benthic node

RAPID Moored Instrument Rig WB3L3_3

This rig was deployed as part of the Western Boundary (WB) array of the MOCHA/RAPIDMOC project.

Deployment cruise RV Seward Johnson cruise SJ08-03-1
Recovery cruise NOAA Ship Ronald H. Brown cruise RB1009

The rig was anchored by a 750 lb anchor and kept erect by sub-surface floats attached along the mooring rope.

Instruments deployed on the rig

Depth Instrument
4840 m Sea-Bird SBE53 BPR Bottom Pressure Recorder (#0005)
4840 m Sea-Bird SBE53 BPR Bottom Pressure Recorder (#0417)

Other Series linked to this Data Activity - 1196693

Cruise

Cruise Name SJ-08-03 Leg 1
Departure Date 2008-04-04
Arrival Date 2008-04-20
Principal Scientist(s)William E Johns (Rosenstiel School of Marine and Atmospheric Science)
Ship RV Seward Johnson

Complete Cruise Metadata Report is available here


Fixed Station Information

Fixed Station Information

Station NameWestern Boundary Array
CategoryOffshore area
Latitude26° 37.50' N
Longitude73° 37.50' W
Water depth below MSL

RAPIDMOC/MOCHA Western Boundary (WB) Array

The Western Boundary Array defines a box in which moorings were deployed at the western side of the North Atlantic as part of the RAPIDMOC project and the collaborative project Meridional Overturning Circulation and Heatflux Array (MOCHA). The box region has latitudinal limits of 26° N to 27.5° N and longitudinal limits of 69.5° W to 77.5° W. Moorings have occupied this region since 2004 and are typically deployed for 6 to 18 months.

Moored data summary

Year Cruise ID Number of moorings Data types (number of instruments)
2004 D278 9 (6 RAPIDMOC, 3 MOCHA) ADCP (2), BPR (8), CM (29), MCTD (52), MMP (1)
2005 KN182_2 11 (6 RAPIDMOC, 5 MOCHA) ADCP (2), BPR (6), CM (27), MCTD (56)
2006 RB06-02, SJ14-06 11 (6 RAPIDMOC, 5 MOCHA) ADCP (1), BPR (3), CM (22), IES (7), MCTD (60)
2007 RB07-01 7 (7 RAPIDMOC) ADCP (1), BPR (4), CM (16), MCTD (47)
2008 SJ08-03 11 (8 RAPIDMOC, 3 MOCHA) ADCP (2), BPR (3), CM (40), MCTD (80)
2009 RB0901, D344, D345 16 (11 RAPIDMOC, 5 MOCHA) ADCP (2), BPR (5), CM (39), MCTD (91), DVS (1)
2010 OC459-1, RB1009 9 (8 RAPIDMOC, 1 MOCHA) ADCP (1), BPR (7), CM (23), MCTD (54)
2011 KN200-4 7 (7 RAPIDMOC, 6 MOCHA) ADCP (2), BPR (7), CM (43), MCTD (86), DVS (1), IES (1)
2012 RB1201, EN517, D382 24 (19 RAPIDMOC, 5 MOCHA) ADCP (3), BPR (19), CM (74), MCTD (130), IES(1)
2014 JC103 24 (9 RAPIDMOC) BPR (8), CM (22), MCTD (36)

Cruise data summary

During the cruises to service the moored array, a variety of data types are collected. The table below is a summary of these data. The number of CTD profiles performed on these cruises within the box region defined above is also included. Trans-Atlantic hydrographic CTD sections have also been performed since 2004 and are included in the table.

Cruise ID Cruise description Data types Number of CTD profiles performed within the box region
D277 Initial array deployment DIS, MET, NAV, SADCP, SURF 1
D278 Initial array deployment DIS, MET, NAV, SADCP, SURF 16
D279 Hydrographic section CTD, DIS, LADCP, MET, NAV, SADCP, SURF 31
KN182_2 Array service CTD, DIS, MET, NAV, SADCP, SURF 64
RB0601 Array service CTD, DIS, LADCP, MET, NAV, SADCP, SURF 39
SJ14-06 Array service CTD, DIS, LADCP, MET, NAV, SADCP, SURF 33
RB07-01 Array service CTD, DIS, LADCP, MET, NAV, SADCP, SURF 36
SJ08-03 Array service CTD, DIS, LADCP, MET, NAV, SADCP, SURF 33
RB0901 Array service CTD, DIS, LADCP, MET, NAV, SADCP, SURF 35
D344 Array service CTD, DIS, MET, NAV, SADCP, SURF 3
D345 Array service CTD, DIS, LADCP, MET, NAV, SADCP, SURF 24
OC459-1 Array service CTD, DIS, MET, NAV, SADCP, SURF 9
OC459-2 Western Boundary Hydrographic section CTD, DIS, LADCP, MET, NAV, SADCP, SURF 27
D346 Hydrographic section CTD, DIS, LADCP, MET, NAV, SADCP, SURF 31
RB1009 WB4 service CTD, MET, SURF, NAV 2
KN200-4 Array service CTD, DIS, MET, NAV, SURF 34
RB1201 Array service CTD, DIS, MET, NAV, SURF 10
EN517 Array service CTD, DIS, LADCP, MET, NAV, SURF 31
D382 Array service CTD, DIS, MET, NAV, SURF 8
JC103 Array service CTD, DIS, MET, NAV, SURF 7

Data type ID and description

Data type ID Description
ADCP Acoustic Doppler Current Profiler
BATH Bathymetry
BPR Bottom Pressure Recorder
CM Current Meter
CTD Conductivity-Temperature-Depth profiler
DIS Discrete water bottle samples
DVS Doppler Volume sampler
IES Inverted Echo Sounder
LADCP Lowered Acoustic Doppler Current Profiler
MET Meteorology
MCTD Moored Conductivity-Temperature-Depth sensor
MOCTD Moored Conductivity-Temperature-Depth Oxygen sensor
MMP McLane Moored Profiler - profiling CTD and current meter
NAV Navigation
SADCP Shipborne Acoustic Doppler Current Profiler
SURF Sea surface data

Other Series linked to this Fixed Station for this cruise - 972954 972966 972978 972991 973005 973017 973029 973030 973042 973054 973066 973078 973091 973109 973110 973122 973134 973146 973158 973171 973183 973195 973202 973214 973226 973238 973251 973263 973275 973287 973299 1016073 1016085 1016097 1016104 1016116 1016128 1196693

Other Cruises linked to this Fixed Station (with the number of series) - D278 (90) D344 (10) D345 (43) D346 (31) D382 (85) EN517 (11) JC103 (9) KN182_2 (87) KN200-4 (135) OC459-1 (64) RB0602 (42) RB0701 (58) RB0901 (78) RB1009 (24) RB1201 (91) SJ-08-03 Leg 2 (76) SJ-14-06 (62)


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