dc.contributor.author | Worsfold, Paul J. | |
dc.contributor.author | Achterberg, Eric P. | |
dc.contributor.author | Birchill, Antony J. | |
dc.contributor.author | Clough, Robert | |
dc.contributor.author | Leito, Ivo | |
dc.contributor.author | Lohan, Maeve C. | |
dc.contributor.author | Milne, Angela | |
dc.contributor.author | Ussher, Simon J. | |
dc.date.accessioned | 2020-05-22T13:28:57Z | |
dc.date.available | 2020-05-22T13:28:57Z | |
dc.date.issued | 2019 | |
dc.identifier.citation | Worsfold, P.J.; Achterberg, E.P.; Birchill, A.J.; Clough, R.; Leito, I.; Lohan, M.C.; Milne, A, and Ussher, S.J. (2019) Estimating Uncertainties in Oceanographic Trace Element Measurements. Frontiers in Marine Science, 5:515, 9pp. DOI: 10.3389/fmars.2018.00515 | en_US |
dc.identifier.uri | http://hdl.handle.net/11329/1337 | |
dc.identifier.uri | http://dx.doi.org/10.25607/OBP-843 | |
dc.description.abstract | A realistic estimation of uncertainty is an essential requirement for all analytical
measurements. It is common practice, however, for the uncertainty estimate of a
chemical measurement to be based on the instrumental precision associated with the
analysis of a single or multiple samples, which can lead to underestimation. Within
the context of chemical oceanography such an underestimation of uncertainty could
lead to an over interpretation of the result(s) and hence impact on, e.g., studies of
biogeochemical cycles, and the outputs from oceanographic models. Getting high
quality observational data with a firm uncertainty assessment is therefore essential
for proper model validation. This paper describes and compares two recommended
approaches that can give a more holistic assessment of the uncertainty associated
with such measurements, referred to here as the “bottom up” or modeling approach
and the “top down” or empirical approach. “Best practice” recommendations for the
implementation of these strategies are provided. The “bottom up” approach combines
the standard uncertainties associated with each stage of the entire measurement
procedure. The “top down” approach combines the uncertainties associated with day
to day reproducibility and possible bias in the complete data set and is easy to use.
For analytical methods that are routinely used, laboratories will have access to the
information required to calculate the uncertainty from archived quality assurance data.
The determination of trace elements in seawater is a significant analytical challenge
and iron is used as an example for the implementation of both approaches using real
oceanographic data. Relative expanded uncertainties of 10 – 20% were estimated for
both approaches compared with a typical short term precision (rsd) of less than or equal to 5%. | en_US |
dc.language.iso | en | en_US |
dc.rights | Attribution 4.0 International | * |
dc.rights.uri | http://creativecommons.org/licenses/by/4.0/ | * |
dc.subject.other | Uncertainty estimation | en_US |
dc.subject.other | Metrology | en_US |
dc.subject.other | Trace elements | en_US |
dc.subject.other | Empirical approach | en_US |
dc.title | Estimating Uncertainties in Oceanographic Trace Element Measurements. | en_US |
dc.type | Journal Contribution | en_US |
dc.description.refereed | Refereed | en_US |
dc.format.pagerange | 9pp. | en_US |
dc.identifier.doi | 10.3389/fmars.2018.00515 | |
dc.subject.parameterDiscipline | Parameter Discipline::Chemical oceanography::Other inorganic chemical measurements | en_US |
dc.subject.parameterDiscipline | Parameter Discipline::Chemical oceanography::Other organic chemical measurements | en_US |
dc.subject.instrumentType | Modelling approach | en_US |
dc.bibliographicCitation.title | Frontiers in Marine Science | en_US |
dc.bibliographicCitation.volume | 5 | en_US |
dc.bibliographicCitation.issue | Article 515 | en_US |
dc.description.sdg | 14.A | en_US |
dc.description.maturitylevel | TRL 8 Actual system completed and "mission qualified" through test and demonstration in an operational environment (ground or space) | en_US |
dc.description.bptype | Manual (incl. handbook, guide, cookbook etc) | en_US |
dc.description.bptype | Best Practice | |
dc.description.frontiers | 2018-04-19 | |
obps.contact.contactname | Paul J. Worsfold | |
obps.contact.contactemail | pworsfold@plymouth.ac.uk | |
obps.resourceurl.publisher | https://www.frontiersin.org/articles/10.3389/fmars.2018.00515/full | en_US |