Estimating aggregated nutrient fluxes in four Finnish rivers via Gaussian state space models
Helske, J., Nyblom, J., Ekholm, P., & Meissner, K. (2013). Estimating aggregated nutrient fluxes in four Finnish rivers via Gaussian state space models. Environmetrics, 24(4), 237-247. https://doi.org/10.1002/env.2204
© 2013 John Wiley & Sons, Ltd. This is a final draft version of an article whose final and definitive version has been published by John Wiley & Sons.
Reliable estimates of the nutrient fluxes carried by rivers from land-based sources to the sea are needed for efficient abatement of marine eutrophication. Although nutrient concentrations in rivers generally display large temporal variation, sampling and analysis for nutrients, unlike flow measurements, are rarely performed on a daily basis. The infrequent data calls for ways to reliably estimate the nutrient concentrations of the missing days. Here, we use the Gaussian state space models with daily water flow as a predictor variable to predict missing nutrient concentrations for four agriculturally impacted Finnish rivers. Via simulation of Gaussian state space models, we are able to estimate aggregated yearly phosphorus and nitrogen fluxes, and their confidence intervals. The effect of model uncertainty is evaluated through a Monte Carlo experiment, where randomly selected sets of nutrient measurements are removed and then predicted by the remaining values together with re-estimated parameters. Results show that our model performs well for rivers with long-term records of flow. Finally, despite the drastic decreases in nutrient loads on the agricultural catchments of the rivers over the last 25 years, we observe no corresponding trends in riverine nutrient fluxes. ...
Publication in research information system
MetadataShow full item record
Showing items with similar title or keywords.
Aleksandrov, Konstantin (University of Jyväskylä, 2016)
Development of a Food-Based Diet Quality Score from a Short FFQ and Associations with Obesity Measures, Eating Styles and Nutrient Intakes in Finnish Twins Masip, Guiomar; Keski-Rahkonen, Anna; Pietiläinen, Kirsi H.; Kujala, Urho M.; Rottensteiner, Mirva; Väisänen, Karoliina; Kaprio, Jaakko; Bogl, Leonie H. (MDPI, 2019)We constructed a food-based diet quality score (DQS) and examined its association with obesity measures, eating styles and nutrient intakes. Participants were 3592 individuals (764 dizygotic [DZ] and 430 monozygotic [MZ] ...
Myllymäki, Mari (University of Jyväskylä, 2009)
Jeyasingh, Punidan D.; Pulkkinen, Katja (Springer, 2019)The availability of iron (Fe) varies considerably among diet items, as well as ecosystems. Availability of Fe has also changed due to anthropogenic environmental changes in oceanic as well as inland ecosystems. We know ...
Barthelemy, Hélène; Stark, Sari; Kytöviita, Minna-Maarit; Olofsson, Johan (Wiley-Blackwell Publishing Ltd., 2017)Herbivores play a key role in shaping ecosystem structure and functions by influencing plant and microbial community composition and nutrient cycling. This study investigated the long‐term effects of herbivores on plant ...