Metadata Report for BODC Series Reference Number 1781363


Metadata Summary

Data Description

Data Category Inverted Echo Sounder Time Series
Instrument Type
NameCategories
University of Rhode Island-Graduate School of Oceanography Inverted Echo Sounder (IES)  inverted echosounders
Instrument Mounting subsurface mooring
Originating Country United States
Originator Dr Chris Meinen
Originating Organization NOAA Atlantic Oceanographic and Meteorological Laboratory
Processing Status banked
Project(s) WBTS
WBTS - Transport Time Series
 

Data Identifiers

Originator's Identifier WBTS_SITE_B_2008REC_SN122
BODC Series Reference 1781363
 

Time Co-ordinates(UT)

Start Time (yyyy-mm-dd hh:mm) 2006-10-07 12:00
End Time (yyyy-mm-dd hh:mm) 2008-09-27 12:00
Nominal Cycle Interval 86400.0 seconds
 

Spatial Co-ordinates

Latitude 26.49100 N ( 26° 29.5' N )
Longitude 76.47000 W ( 76° 28.2' W )
Positional Uncertainty 0.0 to 0.01 n.miles
Minimum Sensor Depth 4803.0 m
Maximum Sensor Depth 4803.0 m
Minimum Sensor Height 1.0 m
Maximum Sensor Height 1.0 m
Sea Floor Depth 4804.0 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
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
TRTM2WPR 1 Milliseconds 2WayTravTimeRefPres Two-way travel time of sound in the water body by echo sounder and standardised to a reference pressure level using concurrent CTD profile data
 

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

Western Boundary Time Series (WBTS) data access

The data from the Western Boundary Time Series (WBTS) project are freely available to all. The project scientists would appreciate it if the following acknowledgment was included in any publications that use this data;

"The Western Boundary Time Series data are made freely available on the Atlantic Oceanographic and Meteorological Laboratory web page (www.aoml.noaa.gov/phod/wbts/) and are funded by the NOAA Climate Observation Division."


Data Policy

Western Boundary Time Series (WBTS) data access

The data from the Western Boundary Time Series (WBTS) project are freely available to all. The project scientists would appreciate it if the following acknowledgment was included in any publications that use this data;

"The Western Boundary Time Series data are made freely available on the Atlantic Oceanographic and Meteorological Laboratory web page (www.aoml.noaa.gov/phod/wbts/) and are funded by the NOAA Climate Observation Division."


Narrative Documents

URI-GSO Inverted Echo Sounder (IES)

The University of Rhode Island-Graduate School of Oceanography (URI-GSO) Inverted Echo Sounder (IES) is an ocean bottom-moored instrument that measures the time it takes for a 12kHz pulse to travel to the sea surface and back again. The IES can be equipped with optional bottom pressure, temperature, and current speed and direction sensors.

It boasts long term stability and, with the optional pressure sensor, barotropic pressure resolution better than 0.1 millibar. It is suitable for use in depths ranging from 500-6700m.

A full specification and further details can be found in the user manual , the data processing manual and the URI-GSO website .

WBTS PIES data processing document

This document outlines the procedures undertaken to process and quality assure the pressure equipped inverted echo sounder (PIES) data collected under the Western Boundary Time Series (WBTS) project.

Originator's processing

The raw data are downloaded from the instrument and converted to ASCII format.

The following procedures are then performed:

References

Meinen C.S and Watts D.R., 2000. Vertical structure and transport on a transect across the North Atlantic Current near 42°N: Time series and mean. Journal of Geophysical Research, Vol 1-5, No C9, Pages 21,869-21,891, September 15.

Meinen C.S., Johns W.E., Garzoli S.L., Van Sebille E., Rayner D., Kanzow T. and Baringer M.O., 2012. Variability of the Deep Western Boundary Current at 26.57°N during 2004-2009, Deep-Sea Research Part II, 85:154-168, doi:10.1016/j.dsr2.2012.07.036.

Meinen C.S and Garlozi S.L., 2014. Attribution of Deep Western Boundary Current variability at 26.5°N. Deep Sea Research I, 90, 81-90, doi:10.1016/j.dsr.2014.04.016.

Munk W and Cartwright D.E., 1966. Tidal Spectroscopy and Prediction. Philosophical Transactions of the Royal Society of London, A 259, doi:10.1098/rsta.1966.0024.

BODC processing

Data are received after quality checks have been made and calibrations have been applied. The data files are submitted in ASCII format as one file per instrument.

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

Raw instrument data are also submitted and are available on request.

Parameter mapping

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

Identifier Unit Definition BODC parameter code Units Unit conversion Comments
Year year Year AADYAA01 days - Combined with MM and DD to form a date and transferred
Month month Month AADYAA01 days - Combined with MM and DD to form a date and transferred
Day day Day AADYAA01 days - Combined with MM and DD to form a date and transferred
- - - AAFDZZ01 Days - Set to 0.5 to represent midday
tau seconds Round trip travel time calibrated to 1000db TRTM2WPR milliseconds *1000 Transferred
Pressure decibar Bottom pressure anomaly PRSTRS01 decibars - Transferred

Project Information

Western Boundary Time Series (WBTS) in the Atlantic Ocean

Introduction

Users of these data are referred to the Western Boundary Time Series (WBTS) in the Atlantic Ocean website for more information. The following text has been taken from the website.

Scientific Rationale

Climate models have shown that variations of the transport of the Meridional Overturning Cell (MOC) in the Atlantic Ocean have significant impacts on the climate at both the national and global level. In the subtropical North Atlantic, the meridional overturning circulation consists primarily of two western boundary components: the northward flowing Gulf Stream and the southward flowing Deep Western Boundary Current.

The Gulf Stream is the strong surface intensified flow along the east coast of the United States that brings warm waters of tropical, including carbon, nutrients and fish, origin along the eastern seaboard of the United States. It supplies warm waters along the coast that impact a multitude of important climate phenomena including hurricane intensification, winter storm formation and moderate European weather. The Gulf Stream includes the bulk of what we call the upper limb of the thermohaline circulation in the subtropical Atlantic, in addition to a strong wind-driven flow. As the Gulf Stream flows northward, it loses heat to the atmosphere until eventually in the subpolar North Atlantic some of it becomes cold enough to sink to the bottom of the ocean. This cold deep water then returns southward along the continental slope of the eastern United States as the Deep Western Boundary Current, completing the circuit of the overturning circulation.

Off the coast of Florida, the Gulf Stream is referred to as the Florida Current and is fortuitously confined within the limited geographic channel between Florida and the Bahamas Islands, thus making a long-term observing system cost effective and sustainable. Similarly, the Deep Western Boundary Current is located within several hundred miles to the east of the Abaco Island, Grand Bahamas. The convenient geometry of the Bahamas Island chain thus allows an effective choke point for establishing a long term monitoring program of this deep limb of the overturning circulation.

Overview

The project consists of several components to monitor the Western Boundary currents in the subtropical Atlantic:


Deep Western Boundary Current (DWBC) Transport Time Series

Introduction

Users of these data are referred to the Deep Western Boundary Current (DWBC) Transport Time Series website for more information. The following text has been taken from the website.

Scientific Rationale

Climate models have shown that variations of the transport of the Meridional Overturning Cell (MOC) in the Atlantic Ocean have significant impacts on the climate at both the national and global level. In the subtropical North Atlantic, the meridional overturning circulation consists primarily of two western boundary components: the northward flowing Gulf Stream and the southward flowing Deep Western Boundary Current.

The Gulf Stream is the strong surface intensified flow along the east coast of the United States that brings warm waters of tropical, including carbon, nutrients and fish, origin along the eastern seaboard of the United States. It supplies warm waters along the coast that impact a multitude of important climate phenomena including hurricane intensification, winter storm formation and moderate European weather. The Gulf Stream includes the bulk of what we call the upper limb of the thermohaline circulation in the subtropical Atlantic, in addition to a strong wind-driven flow. As the Gulf Stream flows northward, it loses heat to the atmosphere until eventually in the subpolar North Atlantic some of it becomes cold enough to sink to the bottom of the ocean. This cold deep water then returns southward along the continental slope of the eastern United States as the Deep Western Boundary Current, completing the circuit of the overturning circulation.

Off the coast of Florida, the Gulf Stream is referred to as the Florida Current and is fortuitously confined within the limited geographic channel between Florida and the Bahamas Islands, thus making a long-term observing system cost effective and sustainable. Similarly, the Deep Western Boundary Current is located within several hundred miles to the east of the Abaco Island, Grand Bahamas. The convenient geometry of the Bahamas Island chain thus allows an effective choke point for establishing a long term monitoring program of this deep limb of the overturning circulation.

Overview

In September 2004 NOAA initiated a program to monitor the flow of the DWBC in near-real-time. This program uses moored inverted echo sounders, some of which are additionally equipped with bottom pressure gauges and deep current meters. Data from these instruments is acoustically downloaded by a passing research vessel about every six months without actually recovering the instruments. In May 2005 this line was extended to also capture the northward flow of the Antilles Current.

Locations of the inverted echo sounders

BODC image


Data Activity or Cruise Information

Cruise

Cruise Name SJ-14-06
Departure Date 2006-09-25
Arrival Date 2006-10-12
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 NameSite B
CategoryOffshore location
Latitude26° 29.48' N
Longitude76° 28.15' W
Water depth below MSL4805.0 m

WBTS - Site B

Site B forms part of the Western Boundary Time Series (WBTS) Current Transport Time Series array. Inverted Echo Sounders, with optional pressure (PIES) and current sensors (C-PIES), have been deployed in the array since 2004. The site is nominally visited once a year to either acoustically telemeter the data or service the instruments.

If the instrument is not be recovered, any data obtained by telemetry are processed and made available.

Data coverage

The table below is a summary of the data collect at Site B.

Year of deployment Instrument type Serial number Deployment cruise Recovery cruise Comments
2004 PIES 169 RB0408 Instrument lost, available data obtained through telemetry
2006 PIES 122 SJ14-06 CH0708
2009 PIES RB0901 Instrument lost, no data available
2009 PIES 239 D345 OC459-1
2010 PIES 62 OC459-1 Instrument lost, no data available
2011 PIES 133 KN200-4 EN551
2015 PIES 323 EN551

Other Cruises linked to this Fixed Station (with the number of series) - D345 (1) KN200-4 (1) RB0408 (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

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