Model evaluation in relation to soil N2O emissions: an algorithmic method which accounts for variability in measurements and possible time lags

V Myrgiotis, M Williams, RM Rees, KE Smith, RE Thorman, CFE Topp

Research output: Contribution to journalArticle

5 Citations (Scopus)
1 Downloads (Pure)

Abstract

The loss of nitrogen from fertilised soils in the form of nitrous oxide (N2O) is a side effect of modern agriculture and the focus of many model-based studies. Due to the spatial and temporal heterogeneity of soil N2O emissions, the measured data can introduce limitations to the use of those statistical methods that are most commonly employed in the evaluation of model performance. In this paper, we describe these limitations and present an algorithm developed to address them. We implement the algorithm using simulated and measured N2O data from two UK arable sites. We show that possible time lags between the measured and simulated data can affect model evaluation and that their consideration in the evaluation process can reduce measures such as the Mean Squared Error (MSE) by 30%. We also analyse the algorithm's results to identify patterns in the estimated lags and to narrow down their possible causes.
Original languageEnglish
Pages (from-to)251 - 262
Number of pages12
JournalEnvironmental Modelling and Software
Volume84
Early online date15 Jul 2016
DOIs
Publication statusFirst published - 15 Jul 2016

Fingerprint

soil emission
nitrous oxide
nitrogen
evaluation
method
soil

Bibliographical note

1030795

Keywords

  • Agro-ecosystems
  • Model evaluation
  • Nitrous oxide
  • Soil modelling
  • Time lag

Cite this

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abstract = "The loss of nitrogen from fertilised soils in the form of nitrous oxide (N2O) is a side effect of modern agriculture and the focus of many model-based studies. Due to the spatial and temporal heterogeneity of soil N2O emissions, the measured data can introduce limitations to the use of those statistical methods that are most commonly employed in the evaluation of model performance. In this paper, we describe these limitations and present an algorithm developed to address them. We implement the algorithm using simulated and measured N2O data from two UK arable sites. We show that possible time lags between the measured and simulated data can affect model evaluation and that their consideration in the evaluation process can reduce measures such as the Mean Squared Error (MSE) by 30{\%}. We also analyse the algorithm's results to identify patterns in the estimated lags and to narrow down their possible causes.",
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Model evaluation in relation to soil N2O emissions: an algorithmic method which accounts for variability in measurements and possible time lags. / Myrgiotis, V; Williams, M; Rees, RM; Smith, KE; Thorman, RE; Topp, CFE.

In: Environmental Modelling and Software, Vol. 84, 15.07.2016, p. 251 - 262.

Research output: Contribution to journalArticle

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T1 - Model evaluation in relation to soil N2O emissions: an algorithmic method which accounts for variability in measurements and possible time lags

AU - Myrgiotis, V

AU - Williams, M

AU - Rees, RM

AU - Smith, KE

AU - Thorman, RE

AU - Topp, CFE

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AB - The loss of nitrogen from fertilised soils in the form of nitrous oxide (N2O) is a side effect of modern agriculture and the focus of many model-based studies. Due to the spatial and temporal heterogeneity of soil N2O emissions, the measured data can introduce limitations to the use of those statistical methods that are most commonly employed in the evaluation of model performance. In this paper, we describe these limitations and present an algorithm developed to address them. We implement the algorithm using simulated and measured N2O data from two UK arable sites. We show that possible time lags between the measured and simulated data can affect model evaluation and that their consideration in the evaluation process can reduce measures such as the Mean Squared Error (MSE) by 30%. We also analyse the algorithm's results to identify patterns in the estimated lags and to narrow down their possible causes.

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