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    Hydrographic data collected by CTD during RVIB Nathaniel B. Palmer cruise in the Ross Sea, Southern Ocean from 2017-2018

Hydrographic data collected by CTD during RVIB Nathaniel B. Palmer cruise in the Ross Sea, Southern Ocean from 2017-2018

Website: https://www.bco-dmo.org/dataset/783911
Data Type: Cruise Results
Version: 1
Version Date: 2020-01-03

» Collaborative Research: Cobalamin and Iron Co-Limitation Of Phytoplankton Species in Terra Nova Bay (CICLOPS)
DiTullio, GiacomoCollege of Charleston (CofC)Principal Investigator
Lee, PeterCollege of Charleston (CofC)Co-Principal Investigator
York, Amber D.Woods Hole Oceanographic Institution (WHOI BCO-DMO)BCO-DMO Data Manager

Hydrographic data collected by CTD during RVIB Nathaniel B. Palmer cruise in the Ross Sea, Southern Ocean from 2017-2018


Spatial Extent: N:-64.7219 E:-173.5369 S:-78.6295 W:179.9983
Temporal Extent: 2017-12-26 - 2018-02-19

Dataset Description

Hydrographic data collected by CTD during RVIB Nathaniel B. Palmer cruise in the Ross Sea, Southern Ocean from 2017-2018.

Acquisition Description

Hydrography data were collected using a Sea-Brid SBE 9 CTD with an SBE 11plus deck unit. The CTD was equipped with sensors to measure temperature, conductivity, pressure, dissolved oxygen, fluorescence, altimetry, beam transmission and irradiance.

Locations: Amundsen Sea, Ross Sea, Terra Nova Bay

Processing Description

Data collected from the CTD were processed using Seasave version The data included are from the downcasts.

BCO-DMO Data Manager Processing Notes:
* added a conventional header with dataset name, PI name, version date
* modified parameter names to conform with BCO-DMO naming conventions (spaces, +, and - changed to underscores). Units in parentheses removed and added to Parameter Description metadata section.
* Concatenated 79 .csv files into one tabular dataset.
* Added column "Station" with the station number from the originally submitted csv filename.
* Changed date format from m/d/Y to ISO 8601 formatted date Y-m-d
* Extracted time from "Julian Day" and "Date" to construct ISO_DateTime_UTC.
* Data sorted by ISO_DateTime_UTC,Station,Pressure,Depth

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StationStation unitless
DateDate in format yyyy-mm-dd unitless
Julian_DayDecimal day of year. Days since Jan 1st of the calendar year with time included as fractional days. days
ISO_DateTime_UTCTimestamp (UTC) in standard ISO 8601:2004(E) format YYYY-mm-ddTHH:MM:SSZ unitless
PressurePressure decibars (db)
DepthDepth meters (m)
TemperatureTemperature (sensor 1) degrees Celsius (C)
Temperature_2Temperature (sensor 2) degrees Celsius
ConductivityConductivity (sensor 1) milliSiemens per centimeter (mS/cm)
Conductivity_2Conductivity (sensor 2) milliSiemens per centimeter (mS/cm)
OxygenOxygen (sensor 1) millileters per liter (mL/L)
Oxygen_2Oxygen (sensor 2) millileters per liter (mL/L)
FluorescenceFluorescence micrograms per cubic meter (mg/m^3)
Beam_TransmissionBeam Transmission percent (%)
PAR_IrradiancePAR/Irradiance micromoles photons per meters squared per second (umol photons/m^2/s)
LatitudeLatitude, degrees North decimal degrees
LongitudeLongitude, degrees East decimal degrees
AltimeterAltitude meters (m)
SPAR_Surface_IrradianceSPAR/Surface Irradiance micromoles photons per meters squared per second (umol photons/m^2/s)
Time_ElapsedTime Elapsed seconds
Scan_CountScan Count unitless
SalinitySalinity (sensor 1) PSU
Salinity_2Salinity (sensor 2) PSU
Oxygen_SaturationOxygen Saturation millileters per liter (mL/L)
Scans_binNumber of scans per meter bin count
FlagFlag.  Quality assurance tag. 0 indicates good quality data with no issues. unitless

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Dataset-specific Instrument Name
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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RVIB Nathaniel B. Palmer
Start Date
End Date
Chief Scientist: Saba, Grace Start Port: Punta Arenas End Port: Hobart

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Project Information

Collaborative Research: Cobalamin and Iron Co-Limitation Of Phytoplankton Species in Terra Nova Bay (CICLOPS)

Coverage: Amundsen Sea, Ross Sea, Terra Nova Bay

NSF abstract:
Phytoplankton blooms in the coastal waters of the Ross Sea, Antarctica are typically dominated by either diatoms or Phaeocystis Antarctica (a flagellated algae that often can form large colonies in a gelatinous matrix). The project seeks to determine if an association of bacterial populations with Phaeocystis antarctica colonies can directly supply Phaeocystis with Vitamin B12, which can be an important co-limiting micronutrient in the Ross Sea. The supply of an essential vitamin coupled with the ability to grow at lower iron concentrations may put Phaeocystis at a competitive advantage over diatoms. Because Phaeocystis cells can fix more carbon than diatoms and Phaeocystis are not grazed as efficiently as diatoms, the project will help in refining understanding of carbon dynamics in the region as well as the basis of the food web webs. Such understanding also has the potential to help refine predictive ecological models for the region. The project will conduct public outreach activities and will contribute to undergraduate and graduate research. Engagement of underrepresented students will occur during summer student internships. A collaboration with Italian Antarctic researchers, who have been studying the Terra Nova Bay ecosystem since the 1980s, aims to enhance the project and promote international scientific collaborations.

The study will test whether a mutualistic symbioses between attached bacteria and Phaeocystis provides colonial cells a mechanism for alleviating chronic Vitamin B12 co-limitation effects thereby conferring them with a competitive advantage over diatom communities. The use of drifters in a time series study will provide the opportunity to track in both space and time a developing algal bloom in Terra Nova Bay and to determine community structure and the physiological nutrient status of microbial populations. A combination of flow cytometry, proteomics, metatranscriptomics, radioisotopic and stable isotopic labeling experiments will determine carbon and nutrient uptake rates and the role of bacteria in mitigating potential vitamin B12 and iron limitation. Membrane inlet and proton transfer reaction mass spectrometry will also be used to estimate net community production and release of volatile organic carbon compounds that are climatically active. Understanding how environmental parameters can influence microbial community dynamics in Antarctic coastal waters will advance an understanding of how changes in ocean stratification and chemistry could impact the biogeochemistry and food web dynamics of Southern Ocean ecosystems.

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Funding SourceAward
NSF Office of Polar Programs (formerly NSF PLR) (NSF OPP)

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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.    2021-04-10  14:47:36