dc.contributor.author | Schar, D. | |
dc.contributor.author | Atkinson, M. | |
dc.contributor.author | Johengen, T. | |
dc.contributor.author | Pinchuk, A. | |
dc.contributor.author | Purcell, H. | |
dc.contributor.author | Robertson, C. | |
dc.contributor.author | Smith, G.J. | |
dc.contributor.author | Tamburri, M. | |
dc.date.accessioned | 2019-01-23T18:45:57Z | |
dc.date.available | 2019-01-23T18:45:57Z | |
dc.date.issued | 2009 | |
dc.identifier.citation | D. Schar, M. Atkinson, T. Johengen, A. Pinchuk, H. Purcell, C. Robertson, G.J. Smith, M. Tamburri (2009) Performance Demonstration Statement PMEL MAPCO2/Battelle Seaology pCO2 Monitoring System. Solomons, MD, Alliance for Coastal Technologies, 24pp. (ACTDS10-02). DOI: http://dx.doi.org/10.25607/OBP-342 | en_US |
dc.identifier.other | [UMCES]CBL 10-09 | |
dc.identifier.uri | http://hdl.handle.net/11329/785 | |
dc.identifier.uri | http://dx.doi.org/10.25607/OBP-342 | |
dc.description.abstract | Alliance for Coastal Technology (ACT) demonstration projects are designed to
characterize performance of relatively new and promising instruments for applications in coastal
science, coastal resource management and ocean observing. ACT has evaluated four commercial
pCO2 instruments that are capable of being moored for weeks to months. This document is
termed a “Demonstration Statement” and provides a summary of the results for two MAPCO2
systems operated and maintained by the NOAA Pacific Marine Environmental Laboratory,
Seattle, WA.
Briefly, test instruments were mounted on surface moorings in a temperate stratified
estuary (Twanoh Buoy, Hood Canal Washington; August-September 2009;
http://orca.ocean.washington.edu/mooringDesign.html;) and a coral reef (Kaneohe Bay Hawaii;
October-November 2009; http://www.pmel.noaa.gov/co2/coastal/HI/). The sites were chosen
based on existing moorings and the expected rapid changes in seawater temperature and pCO2.
Water samples were collected to determine pH and Total Alkalinity (TA) for calculation of pCO2
(CO2Sys; Pierrot et.al. 2006) and direct measurements of pCO2 using a flow-through pCO2
analyzer (Oregon State University; gas equilibration and infrared gas detection). In situ pCO2
measurements are compared to both of these references and estimates of analytical and
environmental variability are reported. Quality Assurance (QA) and oversight of the
demonstration process was accomplished by the ACT QA specialists, who conducted technical,
protocol and data quality audits.
At Twanoh buoy, Hood Canal, temperature varied from 11.09 to 19.62 oC and salinity
varied from 24.3 to 29.1 over the deployment. Measured pCO2 values of reference samples
varied from 334 to 488 µatm while the hourly measured of the MAPCO2 system varied from 325
to 725 µatm providing a more complete assessment of the variability in the ecosystem. The
mean and standard deviation of the difference for individual MAPCO2 determinations and the
Flow Analyzer reference measurements were -9 ± 8 µatm (n=31; MAPCO2 - Flow Analyzer).
The mean and standard deviation of the difference for individual MAPCO2 determinations and
the pCO2Sys reference measurements were -12 ± 30 µatm (n=42; MAPCO2 - pCO2Sys).
At NOAA Crimp 2 buoy, Kaneohe Bay, temperature varied from 23.24 to 28.27 oC and
salinity varied from 34.1 to 35.2 over the deployment. Measured pCO2 values of reference
samples varied from 314 to 608 µatm, while the hourly MAPCO2 measurements varied from 300
to 800 µatm, again capturing more of the full variability in the ecosystem. The mean and
standard deviation of the difference for individual MAPCO2 determinations and the Flow
Analyzer measurements were -3 ± 9 µatm (n=13; MAPCO2 - Flow Analyzer ). The mean and
standard deviation of the difference for individual MAPCO2 determinations and the pCO2Sys
reference measurements were 3 ± 9 µatm (n=45; MAPCO2 - pCO2Sys).
Both of the instrument systems on the moorings functioned throughout the month long
test period. At Washington, 100 percent of expected data were retrieved, while at Hawaii two
individual sample points were not retrieved out of the more than 620 values reported for the
time-series. The extensive time-series provided by the MAPCO2 at both test sites revealed diel
patterns in pCO2 and captured a significantly greater dynamic range and temporal resolution than
could be obtained from discrete reference samples. There were no changes in the differences
between instrument and reference measurements during either test, indicating that biofouling and
instrument drift did not affect measurement performance over the duration of the test. | en_US |
dc.language.iso | en | en_US |
dc.publisher | Alliance for Coastal Technologies (ACT) | en_US |
dc.relation.ispartofseries | ACT DS; 10-02 | |
dc.rights | CC0 1.0 Universal | * |
dc.rights.uri | http://creativecommons.org/publicdomain/zero/1.0/ | * |
dc.title | Performance Demonstration Statement PMEL MAPCO2/Battelle Seaology pCO2 Monitoring System. | en_US |
dc.type | Report | en_US |
dc.description.status | Published | en_US |
dc.format.pages | 24pp. | en_US |
dc.description.refereed | Refereed | en_US |
dc.publisher.place | Solomons, MD | en_US |
dc.subject.parameterDiscipline | Biogeochemistry | en_US |
dc.description.currentstatus | Current | en_US |
dc.description.eov | Carbon | en_US |
dc.description.bptype | Best Practice | en_US |
dc.description.bptype | Standard Operating Procedure | en_US |
obps.contact.contactemail | info@act-us.info | |
obps.contact.contactemail | Johengen@umich.edu | |
obps.resourceurl.publisher | http://www.act-us.info/evaluations.php | en_US |