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    Processed CTD data from all sensors mounted on the rosette from R/V Knorr cruise KN210-04 in the Western Atlantic Ocean between Uruguay and Barbados in 2013 (Deep Atlantic DOM project)
    
  
  
    
    

Processed CTD data from all sensors mounted on the rosette from R/V Knorr cruise KN210-04 in the Western Atlantic Ocean between Uruguay and Barbados in 2013 (Deep Atlantic DOM project)

Website: https://www.bco-dmo.org/dataset/481164
Version: 14 Jan 2014
Version Date: 2014-01-14

Project
» Dissolved Organic Matter Composition in the Deep Atlantic Ocean (Deep Atlantic DOM)

Program
» Ocean Carbon and Biogeochemistry (OCB)
ContributorsAffiliationRole
Kujawinski, ElizabethWoods Hole Oceanographic Institution (WHOI)Principal Investigator
Longnecker, KristaWoods Hole Oceanographic Institution (WHOI)Co-Principal Investigator, Contact
Rauch, ShannonWoods Hole Oceanographic Institution (WHOI BCO-DMO)BCO-DMO Data Manager


Dataset Description

Processed CTD data from all sensors mounted on the rosette from the KN210-04 cruise. Data include temperature, salinity, dissolved oxygen, fluorometry, turbidity, PAR, and SPAR.


Acquisition Description

The CTD rosette was provided by the Knorr Shipboard Science Support Group (SSSG) and was prepared for initial deployment by the SSSG representative on our cruise, Catie Graver. The system was a SBE9+ CTD with a depth limit of 6000m. The investigators used the dual SBE3T/SBE4C sensor system for temperature and conductivity. The rosette was also equipped with a SBE43 oxygen sensor, a Benthos/Datasonics PSA-916 altimeter, a Wet Labs FLNTURTD combination fluorometer and turbidity sensor, and a WetLabs C-star transmissometer (operating at a wavelength of 660 nm with a 25cm pathlength). For hydrocasts less than 1000m deep, the investigators attached a Biospherical Instruments QSP-200L4S underwater PAR sensor. This sensor was linked to a surface PAR sensor on the ship (QSR-240).


Processing Description

After the cruise, Krista Longnecker used SBE Data Processing to convert the data files, filter the data, remove wild edits, and bin average the data into 1-m bins. These processed data were exported to MATLAB and the SBE43 oxygen data were calibrated based on the discrete water samples analyzed during the cruise by Evan Howard (WHOI). Fluorescence values from the WET Labs ECO-AFL/FL have been converted from volts to milligrams per cubic meter using calibration values from WETLabs. The chlorophyll concentrations have not been further calibrated with discrete samples.

BCO-DMO Processing Notes:
- Parameter names were modified to conform with BCO-DMO naming conventions.
- lat_start and lon_start were added by joining the data to the event log and matching on the unique event number.
- Replaced 'NaN' and '-9.99E-29'  with 'nd' to indicate 'no data'.


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Parameters

ParameterDescriptionUnits
castConsecutive cast number for the instrument. dimensionless
stationIdentification number of the sampling station. dimensionless
date_start_utcDate (UTC) given as 4-digit year -- 2-digit month -- 2-digit day. YYYYmmdd
time_start_utcTime (UTC) given as hour -- minute. HHMM
event_startThe event number from the ELOG maintained during the cruise. dimensionless
lat_startLatitude at the time the event started (from the cruise event log). decimal degrees
lon_startLongitude at the time the event started (from the cruise event log). decimal degrees
depthDepth. (Orignally called 'depSM'.) meters
pressPressure. (Originally called 'prDM'.) decibars (db)
tempTemperature from primary sensor on CTD. (Originally called 't090C'.) degrees Celsius (ITS-90)
temp2Temperature from secondary sensor on CTD. (Originally called 't190C'.). degrees Celsius (ITS-90)
salSalinity from primary sensor on CTD. (Originally called 'sal00'.) Practical Salinity Units (PSU)
sal2Salinity from secondary sensor on CTD. (Originally called 'sal11'.) Practical Salinity Units (PSU)
O2_mL_LOxygen from SBE43. milliliters per liter (mL/L)
densityDensity from primary sensor on CTD. (Originally called 'density00'.) kilograms per cubic meter (kg/m^3)
density2Density from secondary sensor on CTD. (Originally called 'density11'.) kilograms per cubic meter (kg/m^3)
latitudeLatitude. decimal degrees
longitudeLongitude. decimal degrees
fluorFluorescence from WET Labs ECO-AFL/FL. (Originally called 'flECO_AFL'.) milligrams per cubic meter (mg/m^3)
transBeam transmission from WET Labs C-Star. (Originally called 'CStarTr0'.) percent (%)
turbidityTurbidity from WET Labs ECO. (Originally called 'tubWETntu0'.) Nephelometric Turbidity Units (NTU)
parPAR / irradiance from Biospherical/Licor. microEinsteins per square meter per second (μE/m2-sec)
sparSPAR / surface irradiance. microEinsteins per square meter per second (μE/m2-sec)
sound_velSound velociy. (Originally called 'svCM1'.) meters per second (m/s) (Chen-Millero)
flagData quality flag. dimensionless


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Instruments

Dataset-specific Instrument Name
Benthos/Datasonics PSA-916 altimeter
Generic Instrument Name
Altimeter
Dataset-specific Description
A Benthos/Datasonics PSA-916 altimeter was equipped on the CTD rosette.
Generic Instrument Description
An instrument that measures height above a fixed surface. The data can be used to map ocean-surface topography and generate gridded surface height fields.

Dataset-specific Instrument Name
Dual SBE3T/SBE4C
Generic Instrument Name
Sea-Bird SBE-3 Temperature Sensor
Dataset-specific Description
A dual SBE3T/SBE4C sensor system for temperature and conductivity was equipped on the CTD rosette.
Generic Instrument Description
The SBE-3 is a slow response, frequency output temperature sensor manufactured by Sea-Bird Electronics, Inc. (Bellevue, Washington, USA). It has an initial accuracy of +/- 0.001 degrees Celsius with a stability of +/- 0.002 degrees Celsius per year and measures seawater temperature in the range of -5.0 to +35 degrees Celsius. more information from Sea-Bird Electronics

Dataset-specific Instrument Name
Dual SBE3T/SBE4C
Generic Instrument Name
Sea-Bird SBE-4 Conductivity Sensor
Dataset-specific Description
A dual SBE3T/SBE4C sensor system for temperature and conductivity was equipped on the CTD rosette.
Generic Instrument Description
The Sea-Bird SBE-4 conductivity sensor is a modular, self-contained instrument that measures conductivity from 0 to 7 Siemens/meter. The sensors (Version 2; S/N 2000 and higher) have electrically isolated power circuits and optically coupled outputs to eliminate any possibility of noise and corrosion caused by ground loops. The sensing element is a cylindrical, flow-through, borosilicate glass cell with three internal platinum electrodes. Because the outer electrodes are connected together, electric fields are confined inside the cell, making the measured resistance (and instrument calibration) independent of calibration bath size or proximity to protective cages or other objects.

Dataset-specific Instrument Name
SBE43 oxygen sensor
Generic Instrument Name
Sea-Bird SBE 43 Dissolved Oxygen Sensor
Dataset-specific Description
An SBE43 oxygen sensor was equipped on the CTD rosette.
Generic Instrument Description
The Sea-Bird SBE 43 dissolved oxygen sensor is a redesign of the Clark polarographic membrane type of dissolved oxygen sensors. more information from Sea-Bird Electronics

Dataset-specific Instrument Name
CTD SBE 911plus
Generic Instrument Name
CTD Sea-Bird SBE 911plus
Generic Instrument Description
The Sea-Bird SBE 911plus is a type of CTD instrument package for continuous measurement of conductivity, temperature and pressure. The SBE 911plus includes the SBE 9plus Underwater Unit and the SBE 11plus Deck Unit (for real-time readout using conductive wire) for deployment from a vessel. The combination of the SBE 9plus and SBE 11plus is called a SBE 911plus. The SBE 9plus uses Sea-Bird's standard modular temperature and conductivity sensors (SBE 3plus and SBE 4). The SBE 9plus CTD can be configured with up to eight auxiliary sensors to measure other parameters including dissolved oxygen, pH, turbidity, fluorescence, light (PAR), light transmission, etc.). more information from Sea-Bird Electronics

Dataset-specific Instrument Name
WL CSTAR Trans
Generic Instrument Name
Wet Labs CSTAR Transmissometer
Dataset-specific Description
A WetLabs C-star transmissometer (operating at a wavelength of 660 nm with a 25cm pathlength) was equipped on the CTD rosette.
Generic Instrument Description
A highly integrated opto-electronic design to provide a low cost, compact solution for underwater measurements of beam transmittance. The instrument is capable of either free space measurements, or through the use of an optical flow tube, flow-through sampling with a pump. It can be used in profiling, moored, or underway applications. more information from Wet Labs

Dataset-specific Instrument Name
Wet Labs FLNTURTD
Generic Instrument Name
WetLabs FLNTU
Dataset-specific Description
A Wet Labs FLNTURTD combination fluorometer and turbidity sensor was equipped on the CTD rosette.
Generic Instrument Description
The WetLabs ECO FLNTU is a dual-wavelength, single-angle sensor for simultaneously determining both chlorophyll fluorescence and turbidity. It detects light scattered by particles suspended in water, generating an output voltage proportional to turbidity or suspended solids. Scaling factors are used to convert the voltage readings to values representing chlorophyll concentration and turbidity expressed in Nephelometric Turbidity Units (NTUs).

Dataset-specific Instrument Name
Biospherical Instruments QSP-200L4S underwater PAR sensor
Generic Instrument Name
Biospherical QSP-200L underwater PAR Sensor
Dataset-specific Description
For hydrocasts less than 1000m deep, a Biospherical Instruments QSP-200L4S underwater PAR sensor was attached to the CTD rosette. This sensor was linked to a surface PAR sensor on the ship (QSR-240).
Generic Instrument Description
Underwater radiometer with a PAR spectral response (400-700nm). Standard configuration had a spherical collector measuring 4-pi scalar irradiance but a flat plate cosine collector was available as an identically-designated option.

Dataset-specific Instrument Name
QSR-240 surface PAR sensor
Generic Instrument Name
Biospherical QSR-240 surface PAR
Dataset-specific Description
For hydrocasts less than 1000m deep, a Biospherical Instruments QSP-200L4S underwater PAR sensor was attached to the CTD rosette. This sensor was linked to a surface PAR sensor on the ship (QSR-240).
Generic Instrument Description
Shipboard radiometer with a PAR spectral response (400-700nm) designed to monitor surface irradiance during underwater light profile measurement. Hemispherical collector measuring 2-pi scalar irradiance.


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Deployments

KN210-04

Website
Platform
R/V Knorr
Start Date
2013-03-25
End Date
2013-05-09
Description
Western Atlantic cruise started at Montevideo, Uruguay and ended at Bridgetown, Barbados. Science Objectives: 1. Characterize deep ocean dissolved organic matter in water masses of western Atlantic Ocean. 2. Characterize microbial community at selected stations and at selected depths. 3. Characterize metabolic capabilities of surface, mesopelagic and bathypelagic microbial consortia vis-a-vis the degradation of organic matter from each zone. 4. Examine metabolic and phylogenetic links between microbes in different marine zones (surface, meso-pelagic and bathypelagic depths). Science Activities: 1. Collection of discrete water samples by Niskin-bottles. 2. Collection of microbial communities from these water samples, by in-situ pumping, or by net-traps and net-tows. 3. Incubation experiments in lab and on deck. 4. Underway mass spectrometry and flow cytometry, from seawater intake. More information is available from the WHOI Cruise Planning Synopsis. Additional cruise information and original data are available from the NSF R2R Data Catalog.


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Project Information

Dissolved Organic Matter Composition in the Deep Atlantic Ocean (Deep Atlantic DOM)

Coverage: Western Atlantic Ocean


Transformations of dissolved organic matter (DOM) in the deep ocean have profound impacts on the global carbon cycle due to the sequestration of carbon dioxide (CO2) away from the atmosphere. Although research has been conducted on the high molecular weight component of this material, the same cannot be said for low molecular weight DOM because the needed analytical techniques have not been available to determine its composition and reactivity. In recent years, a research team at Woods Hole Oceanographic Institution has acquired the necessary analytical capability. As such, in this project, they will carry out the first systematic survey of deep ocean DOM in the western Atlantic Ocean to characterize the low molecular weight fraction of DOM in southward flowing North Atlantic Deep Water (NADW), northward flowing Antarctic Bottom Water (AABW), and Antarctic Intermediate Water (AAIW). Using ultrahigh resolution mass spectrometry and multi-stage fragmentation coupled to liquid chromatography, the scientists will determine the spatial variability in the composition of DOM along the flow path of the water masses, as well as assess the source water, transport, and surface processes that contribute to temporal changes in DOM composition. These results will be augmented with structural elucidation and quantitative assays of unique marker compounds for each water mass. Results will provide important insights into the biogeochemical reactions that govern DOM dynamics in the deep ocean.


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Program Information

Ocean Carbon and Biogeochemistry (OCB)


Coverage: Global


The Ocean Carbon and Biogeochemistry (OCB) program focuses on the ocean's role as a component of the global Earth system, bringing together research in geochemistry, ocean physics, and ecology that inform on and advance our understanding of ocean biogeochemistry. The overall program goals are to promote, plan, and coordinate collaborative, multidisciplinary research opportunities within the U.S. research community and with international partners. Important OCB-related activities currently include: the Ocean Carbon and Climate Change (OCCC) and the North American Carbon Program (NACP); U.S. contributions to IMBER, SOLAS, CARBOOCEAN; and numerous U.S. single-investigator and medium-size research projects funded by U.S. federal agencies including NASA, NOAA, and NSF. The scientific mission of OCB is to study the evolving role of the ocean in the global carbon cycle, in the face of environmental variability and change through studies of marine biogeochemical cycles and associated ecosystems. The overarching OCB science themes include improved understanding and prediction of: 1) oceanic uptake and release of atmospheric CO2 and other greenhouse gases and 2) environmental sensitivities of biogeochemical cycles, marine ecosystems, and interactions between the two. The OCB Research Priorities (updated January 2012) include: ocean acidification; terrestrial/coastal carbon fluxes and exchanges; climate sensitivities of and change in ecosystem structure and associated impacts on biogeochemical cycles; mesopelagic ecological and biogeochemical interactions; benthic-pelagic feedbacks on biogeochemical cycles; ocean carbon uptake and storage; and expanding low-oxygen conditions in the coastal and open oceans.


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Funding

Funding SourceAward
NSF Division of Ocean Sciences (NSF OCE)

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This document is created by info v 4.1f 5 Oct 2018 from the content of the BCO-DMO metadata database.    2019-09-20  02:32:06