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Data server object:  ETP_CTD




  
    CTD data from R/V Seward Johnson and R/V Knorr cruises collected in the Tropical Eastern Pacific from 2007-2009 (ETP project)
    
  
  
    
    

CTD data from R/V Seward Johnson and R/V Knorr cruises collected in the Tropical Eastern Pacific from 2007-2009 (ETP project)

Website: https://www.bco-dmo.org/dataset/651131
Data Type: Cruise Results
Version: final
Version Date: 2016-07-05

Project
» Collaborative Research: Zooplankton in the Redoxcline of the Cariaco Basin: Impact on Biogeochemical Cycling (ETP)

Program
» Ocean Carbon and Biogeochemistry (OCB)
ContributorsAffiliationRole
Daly, Kendra L.University of South Florida (USF)Principal Investigator, Contact
York, AmberWoods Hole Oceanographic Institution (WHOI BCO-DMO)BCO-DMO Data Manager


Coverage

Spatial Extent: N:13.01877 E:-89.99778 S:8.99468 W:-105.01878
Temporal Extent: 2007-10-24

Dataset Description

CTD profiles containing temperature, salinity, oxygen, fluorescence, beam attenuation & transmission, PAR and SPAR.

Related Data:
Event Log data for CTD cruises.
Chlorophyll a data


Acquisition Description

A CTD-rosette was deployed between the surface (2 m) and up to a maximum depth depending on the bottom depth of the station.  The CTD was deployed to ~ 2 m depth, the power turned on, and allowed to sit a few minutes until the pumps turned on and sensors stabilized and equilibrated. The CTD was then lowered at a rate of 30 m/min for the first 100 m, and thereafter at 60 m/min.  Water column profiles and water sample collection often were made using two different CTD casts. Other CTD casts were for primary productivity measurements and to support McLane large volume filtration pump deployments.


Processing Description

Raw data were saved as hex files and converted to 1 m bin averaged data using the Sea-Bird Electronics Inc. Data Processing Software v.7.23.1.

BCO-DMO Processing Notes:
Lat and lon were corrected when there were errors in the data entry or they were changed to 'nd' when the GPS stream failed.


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Parameters

ParameterDescriptionUnits
cruise_idCruise identifier unitless
stationStation number unitless
castnoCast number unitless
lat_startLatitude of station at time of cast decimal degrees
lon_startLongitude of station at time of cast. West is negative decimal degrees
date_startDate at start of cast. UTC unitless
time_startTime at start of cast. UTC unitless
dateDate of sample. UTC unitless
timeTime of sample. UTC unitless
lonLongitude of sample. West is negative decimal degrees
latLatitude of sample decimal degrees
depthDepth of sample meters
tempPrimary temperature (ITS-90). Originally named t090C degrees Celcius
temp2Secondary temperature (ITS-90). Originally named t190C degrees Celcius
potempPrimary potential temperature (ITS-90). Originally named potemp090C degrees Celcius
potemp2Secondary potential temperature (ITS-90). Originally named potemp190C degrees Celcius
salSalinity. Originally named sal00 practical salinity unit (PSU)
condPrimary conductivity. Originally named c0S/m Siemens per meter
cond2Secondary conductivity. Originally named c1S/m Siemens per meter
sigma_e00Primary sigma theta. kilograms per meters cubed
sigma_e11Secondary sigma theta. kilograms per meters cubed
pressPressure decibars
O2_ml_LOxygen. Originally named sbeox0ML/L mililiters per liter
O2_mg_LOxygen. Originally named sbeox0Mg/L miligrams per liter
O2_sat_pcntOxygen saturation. Originally named sbeox0PS percent
O2_umol_kgOxygen. Originally named sbeox0Mm/Kg micromoles per kilogram
sound_vel_ChenSound velocity. Calculated using Chen and Millero (1977) formula. Parameter originally named svCM. meters per second
sound_vel_DelgrossoSound velocity. Calculated using Del Grosso (1974) formula. Parameter originally named svDM. meters per second
sound_vel_WilsonSound velocity. Calculated using Chen and Millero (1977) formula. Parameter originally named svCM. meters per second
beam_cBeam Attenuation Chelsea/Seatech. Parameter orginally named bat. per meter
transBeam Transmission. Parameter originally named xmiss. percent
cparCorrected Irradiance percent
fluorFluorescence (Seapoint). Parameter originally named flSP miligrams per meter cubed
parPhotosynthetically Active Radiation (Biospherical/Licor) microEinsteins per meter squared per second
sparSurficial Photosynthetically Active Radiation microEinsteins per meter squared per second
ISO_DateTime_UTCUTC date and time at start of cast. Formatted using the ISO standard (YYYY-MM-DDTHH:MM:SS[.xx]Z) unitless


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Instruments

Dataset-specific Instrument Name
Biospherical underwater PAR QSP2300
Generic Instrument Name
Photosynthetically Available Radiation Sensor
Generic Instrument Description
A PAR sensor measures photosynthetically available (or active) radiation. The sensor measures photon flux density (photons per second per square meter) within the visible wavelength range (typically 400 to 700 nanometers). PAR gives an indication of the total energy available to plants for photosynthesis. This instrument name is used when specific type, make and model are not known.

Dataset-specific Instrument Name
Biospherical surface PAR QSR220
Generic Instrument Name
Photosynthetically Available Radiation Sensor
Generic Instrument Description
A PAR sensor measures photosynthetically available (or active) radiation. The sensor measures photon flux density (photons per second per square meter) within the visible wavelength range (typically 400 to 700 nanometers). PAR gives an indication of the total energy available to plants for photosynthesis. This instrument name is used when specific type, make and model are not known.

Dataset-specific Instrument Name
Generic Instrument Name
Sea-Bird SBE-3 Temperature Sensor
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
Seabird 4C conductivity sensor
Generic Instrument Name
Sea-Bird SBE-4 Conductivity Sensor
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
C-Point chlorophyll fluorescence sensor
Generic Instrument Name
Fluorometer
Generic Instrument Description
A fluorometer or fluorimeter is a device used to measure parameters of fluorescence: its intensity and wavelength distribution of emission spectrum after excitation by a certain spectrum of light. The instrument is designed to measure the amount of stimulated electromagnetic radiation produced by pulses of electromagnetic radiation emitted into a water sample or in situ.

Dataset-specific Instrument Name
Generic Instrument Name
CTD Sea-Bird 9
Generic Instrument Description
The Sea-Bird SBE 9 is a type of CTD instrument package. The SBE 9 is the Underwater Unit and is most often combined with the SBE 11 Deck Unit (for real-time readout using conductive wire) when deployed from a research vessel. The combination of the SBE 9 and SBE 11 is called a SBE 911. The SBE 9 uses Sea-Bird's standard modular temperature and conductivity sensors (SBE 3 and SBE 4). The SBE 9 CTD can be configured with auxiliary sensors to measure other parameters including dissolved oxygen, pH, turbidity, fluorometer, altimeter, etc.). Note that in most cases, it is more accurate to specify SBE 911 than SBE 9 since it is likely a SBE 11 deck unit was used. more information from Sea-Bird Electronics

Dataset-specific Instrument Name
Generic Instrument Name
Sea-Bird SBE 43 Dissolved Oxygen Sensor
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
Seabird 9+ digital quartz pressure sensor
Generic Instrument Name
Pressure Sensor
Generic Instrument Description
A pressure sensor is a device used to measure absolute, differential, or gauge pressures. It is used only when detailed instrument documentation is not available.

Dataset-specific Instrument Name
Wetlabs CST-721DR 25 cm pathlength transmissometer
Generic Instrument Name
Wet Labs CSTAR Transmissometer
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


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Deployments

SJ07

Website
Platform
R/V Seward Johnson
Start Date
2007-10-18
End Date
2007-11-17
Description
Cruise from Panama City to Panama City Figure 1. Station locations in the eastern tropical north Pacific overlaid on a MODIS (Moderate-resolution Imaging Spectroradiometer) image of ocean color during October 2007. Image courtesy of Inia Soto (USF). SJ07 Cruise Summary (ROSCOP)

KN195-02

Website
Platform
R/V Knorr
Start Date
2008-12-08
End Date
2009-01-06
Description
Figure 1.  Station locations in the eastern tropical north Pacific overlaid on a MODIS (Moderate-resolution Imaging Spectroradiometer) image of ocean color during December 2008. Image courtesy of Inia Soto (USF). KN195-02 Cruise Summary (ROSCOP)


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Project Information

Collaborative Research: Zooplankton in the Redoxcline of the Cariaco Basin: Impact on Biogeochemical Cycling (ETP)

Coverage: Eastern tropical Pacific


This project aims to characterize the spatial and interannual variability of physical, chemical, and biological properties between low productivity and high productivity regions of the eastern tropical Pacific. In particular, we will investigate the physiology of bacteria, phytoplankton, and zooplankton and food web interactions in relation to the oxygen minimum zone. Our results also will provide information on how marine carbon and nitrogen cycles are modified in suboxic regions of the ocean. Measurements include: ADCP, temperature, salinity, O2, pH, total DIC, fCO2, nutrients, CDOM, POC/N, methane oxidation rates, denitrification rates, chlorophyll, phytoplankton C&N uptake rates, bacteria abundance/growth rates/molecular fingerprinting, lipid biomarkers, microzooplankton grazing rates, mesozooplankton abundance, distribution, and physiology, and particle flux rates. NSF abstract: The CARIACO (CArbon Retention In A Colored Ocean) Program is a time-series programs, with the central goal to better understand seasonal to decadal time-scales of processes governing ocean biogeochemistry. The CARIACO site is situated in the tropics on a productive continental margin off Venezuela, the basin is anoxic, and the site is strongly connected to paleoclimate investigations. Thus, CARIACO has the additional goal of relating modern oceanographic processes with the production, transformation, and preservation of particulate matter in the sediment record. Zooplankton composition, behavior, and physiological rates are important components of the biological pump. Recent findings from the Cariaco Basin and other regions with pelagic redoxclines (suboxic and anoxic interfaces) suggest that they are active regions of biogeochemical cycling, in which C may be directly transferred from bacterial production to zooplankton grazers. The goals of this project are to determine the vertical and horizontal distributions of zooplankton in relation to the redoxcline during two seasons using discrete-depth net samples and a vertical-profiling laser-line scan camera system. Anaerobic and aerobic respiration and metabolites, excretion, and egestion rates will be experimentally determined for vertical migrators and resident species nearsurface and at suboxic and anoxic depths to determine whether zooplankton differ in their release of metabolic and egested products, due to differences in their metabolism and/or composition of food resources. Grazing experiments, in combination with lipid biomarkers and stable isotopic compositions, will be used to assess in situ diet and long-term feeding history of zooplankton. Fecal pellet composition will be compared with pellets in sediment traps. Time-series zooplankton samples also will be analyzed to obtain temporal information on zooplankton community dynamics and allow a seasonal estimate of the zooplankton contribution to elemental fluxes. Intellectual Merit. One of the grand challenges of oceanography is to understand the processes that control the transformation and fate of organic carbon in marine systems. Meeting this challenge is hindered by a lack of basic information about factors that govern the response of biological activity to environmental forcing and climate change. In particular, the role of the marine biosphere in the global carbon cycle remains poorly constrained, in part due to uncertainties about biological controls on the quality and quantity of carbon export. This project will contribute to our knowledge of the role of mesozooplankton in biogeochemical cycles, especially in relation to how processes may be modified in regions with anoxic or suboxic layers and strong redox gradients, and will help to correctly understand the links between water column processes and climate history as recorded in the varved sediments of the Cariaco Basin. Broader Impacts. The zooplankton time-series will provide information on patterns of marine biodiversity and ecological interactions from a poorly known region. The CARIACO Program has an ongoing impact in technology transfer and human resource development in Venezuela. This project will help train personnel in Venezuela and will support several graduate students. The lead investigators and students will develop materials on the project for dissemination through the NSF-Center for Ocean Science Education Excellence (COSEE) located at USF. Note [2019-12-17]: BCO-DMO Project page updated to reflect information at nfs.gov for this collaborative award. * Project tile changed from "Eastern Tropical Pacific" to the NSF award title "Collaborative Research: Zooplankton in the Redoxcline of the Cariaco Basin: Impact on Biogeochemical Cycling." * The other award number in this collaborative award added to the page OCE-0526502 * Person roles on the page updated to reflect the NSF award roles (PI or Co-PI) all others on the page changed to "Scientist" from "Co-PI" if not listed as a Co-PI on the NSF award.


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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.    2020-02-18  13:59:10