URLhttps://www.bco-dmo.org/dataset/805206
Download URLhttps://www.bco-dmo.org/dataset/805206/data/download
Media Type text/tab-separated-values
Created March 2, 2020
Modified July 2, 2020
State Final no updates expected

Processing Description

Data were processed in Excel.

BCO-DMO Data Manager Processing Notes:
* Data from originally submitted Excel file Data_sediment_TP_MRP_MUP_v2.xlsx exported as csv.
* added a conventional header with dataset name, PI name, version date
* modified parameter names to conform with BCO-DMO naming conventions
* blank values in this dataset are displayed as "nd" for "no data." nd is the default missing data identifier in the BCO-DMO system.

Instruments

QuikChem 8000 automated ion analyzer [Flow Injection Analyzer]
Details
An instrument that performs flow injection analysis. Flow injection analysis (FIA) is an approach to chemical analysis that is accomplished by injecting a plug of sample into a flowing carrier stream. FIA is an automated method in which a sample is injected into a continuous flow of a carrier solution that mixes with other continuously flowing solutions before reaching a detector. Precision is dramatically increased when FIA is used instead of manual injections and as a result very specific FIA systems have been developed for a wide array of analytical techniques.

Parameters

Replicate [replicate]
Details
Replicate
Replicate of an individual sample

an identifier used to distinguish between one or more replicate samples

Sample_Name [sample]
Details
Sample_Name
Sample name

unique sample identification or number; any combination of alpha numeric characters; precise definition is file dependent

Peak_Concentration [PO4]
Details
Peak_Concentration
Phosphate concentration (uncorrected)

Orthophosphate (phosphate, reactive phosphorus), Various units. 

Actual_PO4 [PO4]
Details
Actual_PO4
Phosphate concentration corrected for dilution

Orthophosphate (phosphate, reactive phosphorus), Various units. 

umol_PO4 [P]
Details
umol_PO4
Amount of phosphorus extracted

P (Phosphorus). May be reported in parts per million, nanomoles per liter, or other units. Refer to dataset metadata for units.

Sediment_mass [weight]
Details
Sediment_mass
Dried sediment mass
weight, various units
umol_PO4_per_g [P]
Details
umol_PO4_per_g
Micromoles of phosphorus per gram of sediment (ground dry weight)

P (Phosphorus). May be reported in parts per million, nanomoles per liter, or other units. Refer to dataset metadata for units.

Region [site]
Details
Region
Collection region name
Sampling site identification.
Latitude [latitude]
Details
Latitude
Collection latitude (South is negative)

latitude, in decimal degrees, North is positive, negative denotes South; Reported in some datasets as degrees, minutes

Longitude [longitude]
Details
Longitude
Collection longitude (West is negative)

longitude, in decimal degrees, East is positive, negative denotes West; Reported in some datsets as degrees, minutes

Water_depth [depth]
Details
Water_depth
Water depth

Observation/sample depth below the sea surface. Units often reported as: meters, feet.


When used in a JGOFS/GLOBEC dataset the depth is a best estimate; usually but not always calculated from pressure; calculated either from CTD pressure using Fofonoff and Millard (1982; UNESCO Tech Paper #44) algorithm adjusted for 1980 equation of state for seawater (EOS80) or simply equivalent to nominal depth as recorded during sampling if CTD pressure was unavailable.

Collection_Start_Date [date]
Details
Collection_Start_Date
Collection start date in ISO 8601 format yyyy-mm-dd

date; generally reported in GMT as YYYYMMDD (year; month; day); also as MMDD (month; day); EqPac dates are local Hawaii time. ISO_Date format is YYYY-MM-DD (http://www.iso.org/iso/home/standards/iso8601.htm)

Collection_End_Date [date]
Details
Collection_End_Date
Collection end date in ISO 8601 format yyyy-mm-dd

date; generally reported in GMT as YYYYMMDD (year; month; day); also as MMDD (month; day); EqPac dates are local Hawaii time. ISO_Date format is YYYY-MM-DD (http://www.iso.org/iso/home/standards/iso8601.htm)

Sediment_Depth_Start [depth_bsf]
Details
Sediment_Depth_Start
Sediment depth minimum

depth below seafloor.  Includes mbsf (meters below seafloor) and cmbsf (centimeters below seafloor).

Sediment_Depth_End [depth_bsf]
Details
Sediment_Depth_End
Sediment depth maximum

depth below seafloor.  Includes mbsf (meters below seafloor) and cmbsf (centimeters below seafloor).

Dataset Maintainers

NameAffiliationContact
Adina PaytanUniversity of California-Santa Cruz (UC Santa Cruz)
Delphine DefforeyUniversity of California-Santa Cruz (UC Santa Cruz)
Amber YorkWoods Hole Oceanographic Institution (WHOI BCO-DMO)

BCO-DMO Project Info

Project Title A new marine sediment sample preparation scheme for solution 31P NMR analysis
Acronym Marine Sediment Analysis 31P NMR
URLhttps://www.bco-dmo.org/project/664054
Created November 7, 2016
Modified February 27, 2020
Project Description

We developed and tested a new approach to prepare marine sediment samples for solution 31P nuclear magnetic resonance spectroscopy (31P NMR). This approach addresses the effects of sample pretreatment on sedimentary P composition and increases the signal of low abundance P species in 31P NMR spectra by removing up the majority inorganic P  from sediment samples while causing minimal alteration of the chemical structure of organic P compounds. The method was tested on natural marine sediment samples from different localities (Equatorial Pacific, California Margin and Arctic Ocean) with high inorganic P content, and allowed for the detection of low abundance P forms in samples for which only an orthophosphate signal could be resolved with an NaOH-EDTA extraction alone. This new approach will allow the use of 31P NMR on samples for which low organic P concentrations previously hindered the use of this tool, and will help answer longstanding question regarding the fate of organic P in marine sediments. We developed and tested a new approach to prepare marine sediment samples for solution 31P nuclear magnetic resonance spectroscopy (31P NMR). This approach addresses the effects of sample pretreatment on sedimentary P composition and increases the signal of low abundance P species in 31P NMR spectra by removing up the majority inorganic P  from sediment samples while causing minimal alteration of the chemical structure of organic P compounds. The method was tested on natural marine sediment samples from different localities (Equatorial Pacific, California Margin and Arctic Ocean) with high inorganic P content, and allowed for the detection of low abundance P forms in samples for which only an orthophosphate signal could be resolved with an NaOH-EDTA extraction alone. This new approach will allow the use of 31P NMR on samples for which low organic P concentrations previously hindered the use of this tool, and will help answer longstanding question regarding the fate of organic P in marine sediments. 

NSF C-DEBI Award #156246 to Dr. Adina Paytan

NSF C-DEBI Award #157598 to Dr. Delphine Defforey 

Data Project Maintainers
NameAffiliationRole
Adina PaytanUniversity of California-Santa Cruz (UC Santa Cruz)Principal Investigator
Delphine DefforeyUniversity of California-Santa Cruz (UC Santa Cruz)Co-Principal Investigator
Barbara J. Cade-MenunAgriculture and Agri-Food Canada (AGR GC)Co-Principal Investigator
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