[Directory] [Data...]

Data server object:  17D_and_isotopic_ratios




  
    17D and isotopic ratios from R/V Yellowfin cruises to the San Pedro Ocean Time-series (SPOT) station in 2013 and 2014
    
  
  
    
    

17D and isotopic ratios from R/V Yellowfin cruises to the San Pedro Ocean Time-series (SPOT) station in 2013 and 2014

Website: https://www.bco-dmo.org/dataset/685820
Data Type: Other Field Results
Version: 1
Version Date: 2017-03-24

Project
» Collaborative Research: Use of Triple Oxygen Isotopes and O2/Ar to constrain Net/Gross Oxygen Production during upwelling and non-upwelling periods in a Coastal Setting (UpRISEE O2 upwelling)
ContributorsAffiliationRole
Haskell, WilliamUniversity of California-Santa Barbara (UCSB-MSI)Principal Investigator
Hammond, Douglas E.University of Southern California (USC)Co-Principal Investigator
Prokopenko, MariaPomona College (Pomona)Co-Principal Investigator
Rauch, ShannonWoods Hole Oceanographic Institution (WHOI BCO-DMO)BCO-DMO Data Manager

Abstract
17D and isotopic ratios from R/V Yellowfin cruises to the San Pedro Ocean Time-series (SPOT) station in 2013 and 2014.


Coverage

Spatial Extent: Lat:33.55 Lon:-118.4
Temporal Extent: 2013-01-16 - 2014-06-19

Dataset Description

17D and isotopic ratios measured for each cruise. Measurements were made at the San Pedro Ocean Time-series (SPOT) station (33 33'N, 118 24'W). Data are also published in Table S1 in the following publication:
Haskell, W. Z.,et al. 2017. Annual cyclicity in export efficiency in the inner Southern California Bight. Global Biogeochemical Cycles, 31. doi:10.1002/2016GB005561


Acquisition Description

See complete methodology in Haskell et al. (2017). In summary:
This study is part of an effort aimed at characterizing the biological response to upwelling at SPOT on 21 cruises between January 2013 and June 2014; the Upwelling Regime In-Situ Ecosystem Efficiency (Up.R.I.S.E.E.) study.

O2/Ar and Triple Oxygen Isotopes (TOI): Samples for O2/Ar and TOI analysis were collected from Niskin bottles in 300 or 500 mL glass flasks equipped with airtight Louwers-Hapert valves (with three high-vacuum greased Viton O-rings in valve stem) and sidearms. Each bottle was poisoned with 150 uL saturated HgCl2, dried in an oven at 50 degrees C, preevacuated on a rotary vane vacuum pump (Pfeiffer Duo 2.5) for at least 5 min before evacuation on a stainless steel gas line using a turbo drag dry high vacuum pump (Alcatel Drytel 31). A vacuum of <1 mtorr was reached and held for at least 5 min, then the bottle was weighed. After sampling, the samples were equilibrated with the headspace for ~12–24 h on a shaking table at University of Southern California (USC), weighed, and drained. The headspace was analyzed in the laboratory of R. Stanley (Woods Hole Oceanographic Institution) for O2 and Ar by peak jumping and for 18O16O (m/z 34) and 17O16O (m/z 33) using a Thermofisher MAT 253 multicollector isotope ratio mass spectrometry. The TOI values are reported relative to atmospheric air as a standard, for which clean Woods Hole air stored in an electropolished 2 L stainless steel cylinder was used. 


Processing Description

BCO-DMO Processing:
-re-formatted into one table;
-modified parameter names to conform with BCO-DMO naming conventions;
-formatted date to yyyy-mm-dd;
-rounded values to 13 digits after decimal (according to PI);
-added site name, lat, and lon from information on metadata form.


[ table of contents | back to top ]

Related Publications

Haskell, W. Z., Prokopenko, M. G., Hammond, D. E., Stanley, R. H. R., & Sandwith, Z. O. (2017). Annual cyclicity in export efficiency in the inner Southern California Bight. Global Biogeochemical Cycles. doi:10.1002/2016gb005561 https://doi.org/10.1002/2016GB005561
Results

[ table of contents | back to top ]

Parameters

ParameterDescriptionUnits
siteName of the site unitless
latLatitude of the site decimal degrees
lonLongitude of the site decimal degrees
cruise_idCruise identifier unitless
dateDate of sampling formatted as yyyy-mm-dd unitless
year4-digit year unitless
month2-digit month unitless
day2-digit day unitless
yrdayYear day (sequential day of year, eg. Jan 1 = 1) unitless
depthSample depth meters (m)
d1717D per meg
O17_to_O1617O to 16O isotope ratio unitless
O18_to_O1618O to 16O isotope ratio unitless


[ table of contents | back to top ]

Instruments

Dataset-specific Instrument Name
Niskin bottle
Generic Instrument Name
Niskin bottle
Dataset-specific Description
Samples for O2/Ar and TOI analysis were collected from Niskin bottles.
Generic Instrument Description
A Niskin bottle (a next generation water sampler based on the Nansen bottle) is a cylindrical, non-metallic water collection device with stoppers at both ends. The bottles can be attached individually on a hydrowire or deployed in 12, 24, or 36 bottle Rosette systems mounted on a frame and combined with a CTD. Niskin bottles are used to collect discrete water samples for a range of measurements including pigments, nutrients, plankton, etc.

Dataset-specific Instrument Name
Thermofisher MAT 253 multicollector isotope ratio mass spectrometry
Generic Instrument Name
Isotope-ratio Mass Spectrometer
Dataset-specific Description
O2 and Ar isotope ratios were measured on a Thermofisher MAT 253 multicollector isotope ratio mass spectrometry at Woods Hole Oceanographic Institution.
Generic Instrument Description
The Isotope-ratio Mass Spectrometer is a particular type of mass spectrometer used to measure the relative abundance of isotopes in a given sample (e.g. VG Prism II Isotope Ratio Mass-Spectrometer).

Dataset-specific Instrument Name
SBE 9plus CTD
Generic Instrument Name
CTD Sea-Bird 9
Dataset-specific Description
Oxygen was measured by using a Seabird SBE 43 oxygen sensor mounted on an SBE 9plus conductivity-temperature-depth (CTD).
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


[ table of contents | back to top ]

Deployments

UpRISEE_SPOT_13-14

Website
Platform
R/V Yellowfin
Start Date
2013-01-16
End Date
2014-06-19
Description
A series of cruises were conducted from January 2013 to June 2014 to the San Pedro Ocean Time-Series (SPOT) station. These cruises were part of a study aimed at characterizing the biological response to upwelling at SPOT: the Upwelling Regime In-Situ Ecosystem Efficiency (Up.R.I.S.E.E.) study.


[ table of contents | back to top ]

Project Information

Collaborative Research: Use of Triple Oxygen Isotopes and O2/Ar to constrain Net/Gross Oxygen Production during upwelling and non-upwelling periods in a Coastal Setting (UpRISEE O2 upwelling)

Coverage: Northeast Pacific Ocean


The marine biological pump is one of the primary pathways via which anthropogenic carbon dioxide may be sequestered from the atmosphere and exported to the deep ocean as organic carbon. While the link between nutrient supply and high primary productivity in upwelling regions is well established, factors controlling the organic carbon export efficiency of upwelling ecosystems are not well known. Scientists from the University of Southern California and Pomona College plan to determine the factors that control the rates and magnitudes of two components of biological production, Net Community Production (NCP) and Gross Primary Production (GPP), as well as particulate organic carbon export efficiency, at the San Pedro Ocean Time Series, a coastal site in the California Borderland during periods of minimal and high upwelling velocity over a 2-year span. At this site, past and ongoing observations of hydrography and carbon rain will provide an historical context for interpreting results and mechanisms at work.

Rates of NCP and GPP will be quantified at different upwelling intensity, using dissolved oxygen to argon (O2/Ar) ratios and the oxygen triple isotope composition of dissolved oxygen (O2). The export of organic carbon will be established using 234Th (thorium) profiles in the water column, coupled with floating sediment trap deployments, and the development of a carbon isotope balance for the water column. Upwelling will be characterized using non-steady state budgets for atmospheric 7Be (beryllium) input and its depth-integrated decay, as well as estimating rates based on remote measurements of wind stress curl and budgets for dissolved inorganic carbon and silicon. Application of the O2/Ar ratio and the oxygen triple isotope approach will require depth-integrated profiles of these tracers to evaluate the impact of upwelling on mixed layer inputs and use of non-steady state models during seasonal transitions in upwelling. The comprehensive data set to be obtained should provide insights into the organic carbon export efficiency under variable upwelling regimes and help to relate the satellite-based measurements of chlorophyll to the organic carbon export of these highly productive ecosystems.

Broader Impacts: One graduate and one undergraduate student from the University of Southern California and two undergraduate students from Pomona College would be supported and trained as part of this project.



[ table of contents | back to top ]

Funding

Funding SourceAward
NSF Division of Ocean Sciences (NSF OCE)
NSF Division of Ocean Sciences (NSF OCE)

[ table of contents | back to top ]

This document is created by info v 4.1f 5 Oct 2018 from the content of the BCO-DMO metadata database.    2022-01-19  23:20:43