Hydrographic data collected during casts with a CTD-rosette system on R/V Endeavor cruise EN614 from May to June 2018

Website: https://www.bco-dmo.org/dataset/757784
Data Type: Cruise Results
Version: 1
Version Date: 2019-03-06

Project
» Collaborative Research: Impact of the Amazon River Plume on Nitrogen Availability and Planktonic Food Web Dynamics in the Western Tropical North Atlantic (Amazon River Plume Nitrogen)
ContributorsAffiliationRole
Montoya, Joseph P.Georgia Institute of Technology (Georgia Tech)Principal Investigator
Peterson, Richard N.Coastal Carolina UniversityCo-Principal Investigator
Subramaniam, AjitLamont-Doherty Earth Observatory (LDEO)Co-Principal Investigator
Rauch, ShannonWoods Hole Oceanographic Institution (WHOI BCO-DMO)BCO-DMO Data Manager

Abstract
Hydrographic data collected during casts with a CTD-rosette system on R/V Endeavor cruise EN614 from May to June 2018.


Coverage

Spatial Extent: N:16.31844 E:-50.88036 S:4.88196 W:-57.26432
Temporal Extent: 2018-05-07 - 2018-05-29

Acquisition Description

Hydrographic data collected during casts with a CTD-rosette system (SBE11plus equipped with a fluorometer, transmissometer, oxygen sensor, and a PAR sensor. Individual sensor details and calibration info provided in the "en614-ProfileNotes" supplemental document.


Processing Description

Data were processed using SeaSave v 7.26.7.107.

BCO-DMO Processing:
- modified parameter names (replaced ".", "-", and "/" with underscores; removed parentheses);
- renamed the second "DepSM" column to "DepSM2";
- replaced blank/empty cells with "nd" (no data);
- removed the blank rows interspersed throughout the file;
- in site names, replaced spaces with underscores and removed commas;
- saved the "en614-ProfileNotes" Excel sheet as a PDF to attach to metadata as a supplemental doc.


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Parameters

ParameterDescriptionUnits
CruiseCruise identifier unitless
SiteSite name unitless
StationStation number unitless
Stn_EventStation event number unitless
FilenameCTD file name unitless
ScanScan count Unitless
TimeJJulian days unitless
TimeSTime, Elapsed seconds
Date_ODVDate and time. Format: yyyy-mm-dd HH:MM unitless
PrDMPressure, Digiquartz decibars (db)
DepSMDepth [salt water, m], lat = 8.34783 meters (m)
T090CTemperature [ITS-90] degrees Celsius
T190CTemperature, 2 [ITS-90] degrees Celsius
T2_T190CTemperature Difference, 2 - 1 [ITS-90] degrees Celsius
C0S_mConductivity Siemens per meter (S/m)
C1S_mConductivity 2 Siemens per meter (S/m)
C2_C1S_mConductivity Difference, 2 - 1 Siemens per meter (S/m)
V0Voltage 0 volts
CStarAt0Beam Attenuation, WET Labs C-Star reciprocal meters (1/m)
CStarTr0Beam Transmission, WET Labs C-Star [%] unitless (percent)
V1Voltage 1 volts
FlECO_AFLFluorescence, WET Labs ECO-AFL/FL milligrams per cubic meter (mg/m^3)
V2Voltage 2 volts
AltMAltimeter meters (m)
V3Voltage 3 volts
ParPAR/Irradiance, Biospherical/Licor micromoles photons per square meter per second (umol photons/m^2/sec)
V4Voltage 4 volts
Sbeox0VOxygen raw, SBE 43 [V] volts
V5Voltage 5 volts
Sbeox1VOxygen raw, SBE 43, 2 [V] volts
V6Voltage 6 volts
V7Voltage 7 volts
SparSPAR, Biospherical/Licor micromoles photons per square meter per second (umol photons/m^2/sec)
PumpsPump Status unitless
LatitudeLatitude decimal degrees
LongitudeLongitude decimal degrees
Sal00Salinity, Practical PSU
Sal11Salinity, Practical, 2 PSU
Sigma_00Density [sigma-theta] kilograms per cubic meter (kg/m^3)
Sigma_11Density, 2 [sigma-theta] kilograms per cubic meter (kg/m^3)
Sbeox0Mm_LOxygen, SBE 43, WS = 2 micromoles per liter (umol/L)
Sbeox1Mm_LOxygen, SBE 43, 2, WS = 2 micromoles per liter (umol/L)
Potemp090CPotential Temperature [ITS-90] degrees Celsius
Potemp190CPotential Temperature, 2 [ITS-90] degrees Celsius
SvCMSound Velocity [Chen-Millero] meters per second (m/s)
SvCM1Sound Velocity, 2 [Chen-Millero] meters per second (m/s)
Dz_dtMDescent Rate, WS = 2 meters per second (m/s)
GpaGeopotential Anomaly joules per kilogram (J/kg)
NbinNumber of scans per bin unitless
FlagFlag unitless
DepSM2Depth [salt water, m], lat = 8.34783 meters


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Instruments

Dataset-specific Instrument Name
Sea-Bird SBE 9, 11plus V 5.2
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


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Deployments

EN614

Website
Platform
R/V Endeavor
Start Date
2018-05-06
End Date
2018-06-01
Description
Cruise associated with project "Collaborative Research: Impact of the Amazon River Plume on Nitrogen Availability and Planktonic Food Web Dynamics in the Western Tropical North Atlantic" (https://www.bco-dmo.org/project/751093)


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Project Information

Collaborative Research: Impact of the Amazon River Plume on Nitrogen Availability and Planktonic Food Web Dynamics in the Western Tropical North Atlantic (Amazon River Plume Nitrogen)

Coverage: Amazon River plume


This is a focused program of field research in waters of the Western Tropical North Atlantic influenced by the Amazon River Plume during the high river flow season. The Amazon Plume region supports diverse plankton communities in a dynamic system driven by nutrients supplied by transport from the river proper as well as nutrients entrained from offshore waters by physical mixing and upwelling. This creates strong interactions among physical, chemical, and biological processes across a range of spatial and temporal scales. The field program will link direct measurements of environmental properties with focused experimental studies of nutrient supply and nutrient limitation of phytoplankton, as well as the transfer of phytoplankton nitrogen to the zooplankton food web. The Amazon Plume exhibits a close juxtaposition of distinct communities during the high-flow season, making it an ideal site for evaluating how nutrient availability, nutrient supply, and habitat longevity interact to drive offshore ecosystem dynamics and function. This project will include German collaborators and will seamlessly integrate education and research efforts. The investigators and their institutions have a strong commitment to undergraduate and graduate education and to increasing the diversity of the ocean science community through active recruiting and training efforts. The team has a strong track record of involving both undergraduate and graduate students in their field and lab research. The two research cruises planned will provide opportunities for students and technicians to interact with an interdisciplinary and international research team. The ultimate objectives of this project are to understand the processes and interactions that promote distinct communities of nitrogen-fixing organisms (diazotrophs) and other phytoplankton around the Amazon Plume and to explore the impacts of these diazotroph-rich communities on zooplankton biomass and production. The research team includes scientists with expertise in nutrient and stable isotope biogeochemistry, remote sensing as well as specialists in characterizing water mass origin and history using naturally occurring radium isotopes. This combination of approaches will provide a unique opportunity to address fundamental questions related to plankton community structure, primary production, and links to secondary production in pelagic ecosystems. The project will address the following key questions focused on fundamental issues in plankton ecology resulting from previous research in this region: A. What mechanisms promote the preferential delivery of bioavailable phosphorus and the resulting strong nitrogen limitation associated with the northern reaches of the Amazon Plume during the high flow season? B. What factors lead to the clear niche separation between diazotrophs within and around the Amazon Plume and how are the distinct diazotroph communities influenced by hydrographic and biogeochemical controls associated with the Amazon River Plume and offshore upwelling processes? C. How does the nitrogen fixed by the different types of diazotrophs contribute to secondary production, and how efficiently does diazotroph nitrogen move through the food web?


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Funding

Funding SourceAward
NSF Division of Ocean Sciences (NSF OCE)

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