Dataset: Biogenic Silica CTD Bottles
Deployment: HRS2204

Biogenic Silica CTD Bottles HRS2204

View Data: For data, See Dataset Metadata Page: https://www.bco-dmo.org/dataset/945973

Principal Investigator:

Matthew Rau (Pennsylvania State University, PSU)

Scientist:

Kimberlee Thamatrakoln (Rutgers University)

Student:

Austin Grubb (Rutgers University)

BCO-DMO Data Manager:

Audrey Mickle (Woods Hole Oceanographic Institution, WHOI BCO-DMO)

Project:

Collaborative Research: The importance of particle disaggregation on biogeochemical flux predictions (Disaggregation)

Version:

Deployment Synonyms:

GoM22 cruise

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Description

Methods & Sampling

Dataset acquisition description

This cruise visited eight stations on the Northeastern U.S. Continental Shelf. Latitudes and longitudes provided per sample in the data, but general station descriptions are below.

Station 1 - Station 3: Georges Bank near the Gulf of Maine. Approximate location was 41.7 N, 68 W. Samples acquired from 0 m to 25 m depths.
Station 4: The Great South Channel near the Gulf of Maine. Approximate location was 41.6 N, 69 W. Samples acquired from 0 m to 150 m depths.
Station 5: Only one CTD profile was taken before this station was aborted due to weather. No data acquired. Station location was 40.8 N, 70.5 W.
Station 6: Off the coast of Martha's Vineyard. Approximate location was 41.3 N, 70.5 W. Samples acquired from 0 m to 10 m depths.
Station 7: At the mouth of the Sakonnet River near Newport, Rhode Island. Approximate location was 41.5 N, 71.2 W. Samples acquired from 0 m to 10 m depths.
Station 8: Hudson Canyon near New York. Approximate location was 39.5 N, 72.3 W. Samples acquired from 0 m to 200 m depths.

Samples for biogenic silica measurements were collected via filtration onto 1.2 µm pore-size, polycarbonate filters (Millipore) and stored at -20 degree C until processing. Downstream analysis was done using a modified sodium hydroxide digestion method as described in Krause et al. 2009. Micro-molar of silicon was calculated from transmission using a spectrophotometer with a 1 cm cuvette.

Data Processing Description

Dataset Processing Description

Biogenic silica concentrations were calculated from sample transmission measurements through absorbance calibration and accounting for dilution using Microsoft Excel. Transmissivity measurements were converted to absorbance, after which the calibration curve was applied to calculate concentration. Absorbance was calibrated by adding between 0 and 100 micro-molar of Silicon to a 1-cm cuvette. Absorbance-to-Silicon concentrations showed a linear correlation with an R2 value of 0.999.

More information about this dataset deployment

Funding

Award Number	Funding Source
OCE-1948283	NSF Division of Ocean Sciences

Instruments

CTD Sea-Bird 911

Supplied Name: CTD

Supplied Description:

Instrument Type

Generic Name: CTD Sea-Bird 911

Acronym: CTD SBE 911

Community Identifier: http://vocab.nerc.ac.uk/collection/L22/current/TOOL0035/

Generic Description:

The Sea-Bird SBE 911 is a type of CTD instrument package. The SBE 911 includes the SBE 9 Underwater Unit and the SBE 11 Deck Unit (for real-time readout using conductive wire) for deployment from a 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, fluorescence, light (PAR), light transmission, etc.). More information from Sea-Bird Electronics.

Spectrophotometer

Supplied Name: spectrophotometer

Supplied Description:

Downstream analysis was done using a modified sodium hydroxide digestion method as described in Krause et al. 2009. Micro-molar of silicon was calculated from transmission using a spectrophotometer with a 1 cm cuvette.

Instrument Type

Generic Name: Spectrophotometer

Community Identifier: http://vocab.nerc.ac.uk/collection/L05/current/LAB20/

Generic Description:

An instrument used to measure the relative absorption of electromagnetic radiation of different wavelengths in the near infra-red, visible and ultraviolet wavebands by samples.

Parameters

Supplied Name	Supplied description	Supplied Units	Standard Name
ID	Identifier of the CTD cast sample, formatted as (station#_CTDcast#_depth)	unitless	sample
Station	Station number	unitless	station
CTD	CTD cast number	unitless	cast
Depth	Depth in meters that the CTD bottle was triggered for sampling	meters (m)	depth
ISO_DateTime_UTC	ISO datetime the sample was acquired in UTC	unitless	ISO_DateTime_UTC
Date_UTC	UTC date on which the sample was acquired	unitless	date
Time_UTC	UTC time when the sample was acquired	unitless	time
Latitude	Ship's latitude when the sample was taken	decimal degrees	lat
Longitude	Ship's longitude when the sample was taken	decimal degrees	lon
bSi	Biogenic silica in micro-moles of Silicon per liter of seawater	(umol/Si/L)	Si_bio

Database

Contribute Data

Dataset: Biogenic Silica CTD Bottles
Deployment: HRS2204

Dataset acquisition description

Dataset Processing Description

Database

Contribute Data

Dataset: Biogenic Silica CTD BottlesDeployment: HRS2204

Dataset acquisition description

Dataset Processing Description

Dataset: Biogenic Silica CTD Bottles
Deployment: HRS2204