Cargando…

Effect of the time scale on the uncertainty of geometric mean concentrations of fecal indicators in creek under baseflow conditions

Geometric mean concentrations of fecal indicator bacteria E. coli and enterococci are commonly used to evaluate the microbial quality of irrigation, recreation, and other types of waters, as well in watershed-scale microbial water quality modeling. It is not known how the uncertainty of those geomet...

Descripción completa

Detalles Bibliográficos
Autores principales: Jeon, Dong Jin, Pachepsky, Yakov, Harriger, M. Dana, Zhu, Rachael, Coppock, Cary
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6997410/
https://www.ncbi.nlm.nih.gov/pubmed/32015450
http://dx.doi.org/10.1038/s41598-020-58603-5
_version_ 1783493691644575744
author Jeon, Dong Jin
Pachepsky, Yakov
Harriger, M. Dana
Zhu, Rachael
Coppock, Cary
author_facet Jeon, Dong Jin
Pachepsky, Yakov
Harriger, M. Dana
Zhu, Rachael
Coppock, Cary
author_sort Jeon, Dong Jin
collection PubMed
description Geometric mean concentrations of fecal indicator bacteria E. coli and enterococci are commonly used to evaluate the microbial quality of irrigation, recreation, and other types of waters, as well in watershed-scale microbial water quality modeling. It is not known how the uncertainty of those geometric mean concentrations depends on the time period between sampling. We analyzed data collected under baseflow conditions from three years of weekly and several daily sampling campaigns at Conococheague Creek in Pennsylvania. Standard deviations of logarithms of geometric mean concentrations were computed over weeks, months, and seasons. The increase in standard deviations from weekly to seasonal time scale was on average about 0.1 and 0.2 for log(E. coli) and log(enterococci), respectively, and in most cases was statistically significant. This may need to be accounted for when evaluating the uncertainty of measurements for modeling purposes and in risk assessment of microbial water quality.
format Online
Article
Text
id pubmed-6997410
institution National Center for Biotechnology Information
language English
publishDate 2020
publisher Nature Publishing Group UK
record_format MEDLINE/PubMed
spelling pubmed-69974102020-02-10 Effect of the time scale on the uncertainty of geometric mean concentrations of fecal indicators in creek under baseflow conditions Jeon, Dong Jin Pachepsky, Yakov Harriger, M. Dana Zhu, Rachael Coppock, Cary Sci Rep Article Geometric mean concentrations of fecal indicator bacteria E. coli and enterococci are commonly used to evaluate the microbial quality of irrigation, recreation, and other types of waters, as well in watershed-scale microbial water quality modeling. It is not known how the uncertainty of those geometric mean concentrations depends on the time period between sampling. We analyzed data collected under baseflow conditions from three years of weekly and several daily sampling campaigns at Conococheague Creek in Pennsylvania. Standard deviations of logarithms of geometric mean concentrations were computed over weeks, months, and seasons. The increase in standard deviations from weekly to seasonal time scale was on average about 0.1 and 0.2 for log(E. coli) and log(enterococci), respectively, and in most cases was statistically significant. This may need to be accounted for when evaluating the uncertainty of measurements for modeling purposes and in risk assessment of microbial water quality. Nature Publishing Group UK 2020-02-03 /pmc/articles/PMC6997410/ /pubmed/32015450 http://dx.doi.org/10.1038/s41598-020-58603-5 Text en © The Author(s) 2020 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
spellingShingle Article
Jeon, Dong Jin
Pachepsky, Yakov
Harriger, M. Dana
Zhu, Rachael
Coppock, Cary
Effect of the time scale on the uncertainty of geometric mean concentrations of fecal indicators in creek under baseflow conditions
title Effect of the time scale on the uncertainty of geometric mean concentrations of fecal indicators in creek under baseflow conditions
title_full Effect of the time scale on the uncertainty of geometric mean concentrations of fecal indicators in creek under baseflow conditions
title_fullStr Effect of the time scale on the uncertainty of geometric mean concentrations of fecal indicators in creek under baseflow conditions
title_full_unstemmed Effect of the time scale on the uncertainty of geometric mean concentrations of fecal indicators in creek under baseflow conditions
title_short Effect of the time scale on the uncertainty of geometric mean concentrations of fecal indicators in creek under baseflow conditions
title_sort effect of the time scale on the uncertainty of geometric mean concentrations of fecal indicators in creek under baseflow conditions
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6997410/
https://www.ncbi.nlm.nih.gov/pubmed/32015450
http://dx.doi.org/10.1038/s41598-020-58603-5
work_keys_str_mv AT jeondongjin effectofthetimescaleontheuncertaintyofgeometricmeanconcentrationsoffecalindicatorsincreekunderbaseflowconditions
AT pachepskyyakov effectofthetimescaleontheuncertaintyofgeometricmeanconcentrationsoffecalindicatorsincreekunderbaseflowconditions
AT harrigermdana effectofthetimescaleontheuncertaintyofgeometricmeanconcentrationsoffecalindicatorsincreekunderbaseflowconditions
AT zhurachael effectofthetimescaleontheuncertaintyofgeometricmeanconcentrationsoffecalindicatorsincreekunderbaseflowconditions
AT coppockcary effectofthetimescaleontheuncertaintyofgeometricmeanconcentrationsoffecalindicatorsincreekunderbaseflowconditions