http://lod.bco-dmo.org/id/dataset/822399
eng; USA
utf8
dataset
Highest level of data collection, from a common set of sensors or instrumentation, usually within the same research project
Biological and Chemical Oceanography Data Management Office (BCO-DMO)
Unavailable
508-289-2009
WHOI MS#36
Woods Hole
MA
02543
USA
info@bco-dmo.org
http://www.bco-dmo.org
Monday - Friday 8:00am - 5:00pm
For questions regarding this resource, please contact BCO-DMO via the email address provided.
pointOfContact
2020-08-28
ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data
ISO 19115-2:2009(E)
Raw absorbance and R measurements of CRMs
2020-08-29
publication
2020-08-29
revision
Marine Biological Laboratory/Woods Hole Oceanographic Institution Library (MBLWHOI DLA)
2020-09-18
publication
https://doi.org/10.26008/1912/bco-dmo.822399.1
Ryan Woosley
Massachusetts Institute of Technology
principalInvestigator
Biological and Chemical Oceanography Data Management Office (BCO-DMO)
Unavailable
508-289-2009
WHOI MS#36
Woods Hole
MA
02543
USA
info@bco-dmo.org
http://www.bco-dmo.org
Monday - Friday 8:00am - 5:00pm
For questions regarding this resource, please contact BCO-DMO via the email address provided.
publisher
Cite this dataset as: Woosley, R. (2020) Raw absorbance and R measurements of CRMs. Biological and Chemical Oceanography Data Management Office (BCO-DMO). (Version 1) Version Date 2020-08-29 [if applicable, indicate subset used]. doi:10.26008/1912/bco-dmo.822399.1 [access date]
Raw absorbance and R measurements of CRMs Dataset Description: <p>Raw absorbance and R measurements of CRMs.</p> Methods and Sampling: <p>The temperature dependence of spectrophotometric pH measurements was determined and compared to values calculated from total alkalinity and dissolved inorganic carbon using different combinations of the required dissociation constants. Spectrophotometric measurements were made on two batches of CRMS (179 and 189) between -1.7 and 40&nbsp;˚C.</p>
<p>A custom designed spectrophotometric pH system was used similar to the system described in Carter et al. (2013). It consists of an Agilent 8454 UV-Vis spectrophotometer with a Kloehn v6 syringe pump to rinse, fill, and add the indicator dye to a 10 cm quartz microvolume spectrophotometer cell. A batch of ~2 millimolar Purified meta-cresol purple indicator dye (provided by Robert H. Byrne, University of South Florida) prepared in ~0.7 molar NaCl was used. The pH on the total scale was calculated using the equations of Liu et al. (2011). The dye perturbation was accounted for by making 20 measurements at each temperature with varying amounts of dye and extrapolating to zero dye added. Both the final pH values and the raw absorbances are available from BCO-DMO.&nbsp;Further details of the methods can be found in Woosley (2020).</p>
Funding provided by NSF Division of Ocean Sciences (NSF OCE) Award Number: OCE-1923312 Award URL: https://www.nsf.gov/awardsearch/show-award?AWD_ID=1923312
completed
Ryan Woosley
Massachusetts Institute of Technology
617-253-1984
77 Massachusetts Ave Bldg. 54-1414
Cambridge
MA
02139
USA
rwoosley@mit.edu
pointOfContact
asNeeded
Dataset Version: 1
Unknown
Batch
Bottle
Calculation_Temp
Measured_Temp
A434
A578
A730
Aiso
R
Agilent 8454 UV-Vis Spectrophotometer
theme
None, User defined
sample identification
water temperature at measurement depth
absorbance
featureType
BCO-DMO Standard Parameters
Spectrophotometer
instrument
BCO-DMO Standard Instruments
otherRestrictions
otherRestrictions
Access Constraints: none. Use Constraints: Please follow guidelines at: http://www.bco-dmo.org/terms-use Distribution liability: Under no circumstances shall BCO-DMO be liable for any direct, incidental, special, consequential, indirect, or punitive damages that result from the use of, or the inability to use, the materials in this data submission. If you are dissatisfied with any materials in this data submission your sole and exclusive remedy is to discontinue use.
Improving Accuracy and Precision of Marine Inorganic Carbon Measurements
https://osprey.bco-dmo.org/project/813194
Improving Accuracy and Precision of Marine Inorganic Carbon Measurements
<p><em>NSF Award Abstract:</em><br />
The oceans absorb about one third of the CO2 humans release into the atmosphere from the burning of fossil fuels and other activities. While ocean uptake of CO2 slows its rate of increase in the atmosphere, it comes with costs for the oceans and the organisms that live there. Once in seawater, CO2 reacts with water to produce bicarbonate and hydrogen ions. The increase in hydrogen ions lowers the pH in a process called ocean acidification. Not all areas of the ocean are affected equally. The solubility of CO2 is greater in the cold waters of the Arctic making them more prone to ocean acidification. However, due to the low temperatures and low salinities in the Arctic, the uncertainties in pH values are much larger there than for the other oceans. This project evaluates pH at low temperatures and salinities, and develops best practice recommendations to improve the ability to compare measurements among laboratory groups and studies and reduce overall uncertainty in the measurements. The project provides training for an undergraduate student and promotes awareness of ocean acidification through public outreach.</p>
<p>Having highly accurate and precise measurements are important for monitoring changes to pH and CO2 uptake through time and the effects on marine life. In order to improve pH measurements for polar waters, several different experiments will be conducted. The temperature dependence of pH will be determined from 30˚C to near freezing for low salinity waters. The results will be compared to current chemical models to quantify offsets and biases. Recommendations will be made for the best physical chemical model to use for low temperature and salinity seawater. Moreover, pH is measured spectrophotometrically using an indicator dye. Preparation and calibration of the indictor is important to standardize studies across space and time and ensure comparability. Indicator quality is essential for detecting ocean acidification, but its stability is currently unknown. If the dye degrades after production, biases or artifacts in pH measurements may result as the dye ages. Experiments will be undertaken using batches of dyes from weeks to over 10 years old to resolve its degradation characteristics. The experiments will establish how long a batch of dye remains valid once it is prepared without biasing the measurements. This is particularly important for long term studies such as extended research expeditions and autonomous systems where a batch of dye may be used over a year. Together, by both investigating the validity of chemical models for seawater pH at low temperature and salinity and examining the stability of the pH indicator dye, methodological uncertainties can be reduced to permit better monitoring of changes in global ocean pH.</p>
<p>This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.</p>
Inorganic Carbon Meaurements
largerWorkCitation
project
eng; USA
oceans
2020-08-29
Lab studies
0
BCO-DMO catalogue of parameters from Raw absorbance and R measurements of CRMs
Biological and Chemical Oceanography Data Management Office (BCO-DMO)
Unavailable
508-289-2009
WHOI MS#36
Woods Hole
MA
02543
USA
info@bco-dmo.org
http://www.bco-dmo.org
Monday - Friday 8:00am - 5:00pm
For questions regarding this resource, please contact BCO-DMO via the email address provided.
pointOfContact
http://lod.bco-dmo.org/id/dataset-parameter/822406.rdf
Name: Batch
Units: unitless
Description: <p>CRM batch number</p>
http://lod.bco-dmo.org/id/dataset-parameter/822407.rdf
Name: Bottle
Units: unitless
Description: <p>CRM bottle number</p>
http://lod.bco-dmo.org/id/dataset-parameter/822408.rdf
Name: Calculation_Temp
Units: degrees Celsius
Description: <p>Temperature for calculating pH</p>
http://lod.bco-dmo.org/id/dataset-parameter/822409.rdf
Name: Measured_Temp
Units: degrees Celsius
Description: <p>Temperature of sample</p>
http://lod.bco-dmo.org/id/dataset-parameter/822410.rdf
Name: A434
Units: AU
Description: <p>Absorbance at 434 nm</p>
http://lod.bco-dmo.org/id/dataset-parameter/822411.rdf
Name: A578
Units: AU
Description: <p>Absorbance at 578 nm</p>
http://lod.bco-dmo.org/id/dataset-parameter/822412.rdf
Name: A730
Units: AU
Description: <p>Absorbance at 730 nm</p>
http://lod.bco-dmo.org/id/dataset-parameter/822413.rdf
Name: Aiso
Units: AU
Description: <p>Absorbance at isosbestic point</p>
http://lod.bco-dmo.org/id/dataset-parameter/822414.rdf
Name: R
Units: unitless
Description: <p>Absorbance ratio</p>
GB/NERC/BODC > British Oceanographic Data Centre, Natural Environment Research Council, United Kingdom
Biological and Chemical Oceanography Data Management Office (BCO-DMO)
Unavailable
508-289-2009
WHOI MS#36
Woods Hole
MA
02543
USA
info@bco-dmo.org
http://www.bco-dmo.org
Monday - Friday 8:00am - 5:00pm
For questions regarding this resource, please contact BCO-DMO via the email address provided.
pointOfContact
43340
https://darchive.mblwhoilibrary.org/server/api/core/bitstreams/7497dbd3-9936-5e0c-b872-93231a0a3159/content
download
https://doi.org/10.26008/1912/bco-dmo.822399.1
download
onLine
dataset
<p>The temperature dependence of spectrophotometric pH measurements was determined and compared to values calculated from total alkalinity and dissolved inorganic carbon using different combinations of the required dissociation constants. Spectrophotometric measurements were made on two batches of CRMS (179 and 189) between -1.7 and 40&nbsp;˚C.</p>
<p>A custom designed spectrophotometric pH system was used similar to the system described in Carter et al. (2013). It consists of an Agilent 8454 UV-Vis spectrophotometer with a Kloehn v6 syringe pump to rinse, fill, and add the indicator dye to a 10 cm quartz microvolume spectrophotometer cell. A batch of ~2 millimolar Purified meta-cresol purple indicator dye (provided by Robert H. Byrne, University of South Florida) prepared in ~0.7 molar NaCl was used. The pH on the total scale was calculated using the equations of Liu et al. (2011). The dye perturbation was accounted for by making 20 measurements at each temperature with varying amounts of dye and extrapolating to zero dye added. Both the final pH values and the raw absorbances are available from BCO-DMO.&nbsp;Further details of the methods can be found in Woosley (2020).</p>
Specified by the Principal Investigator(s)
asNeeded
7.x-1.1
Biological and Chemical Oceanography Data Management Office (BCO-DMO)
Unavailable
508-289-2009
WHOI MS#36
Woods Hole
MA
02543
USA
info@bco-dmo.org
http://www.bco-dmo.org
Monday - Friday 8:00am - 5:00pm
For questions regarding this resource, please contact BCO-DMO via the email address provided.
pointOfContact
Agilent 8454 UV-Vis Spectrophotometer
Agilent 8454 UV-Vis Spectrophotometer
PI Supplied Instrument Name: Agilent 8454 UV-Vis Spectrophotometer Instrument Name: Spectrophotometer Instrument Short Name:Spectrophotometer Instrument 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. Community Standard Description: http://vocab.nerc.ac.uk/collection/L05/current/LAB20/