Combining <em>in-situ</em> fluorometry and distributed rainfall data provides new insights into natural organic matter transport dynamics in an urban river
Croghan, Danny; Khamis, Kieran; Bradley, Chris; Van Loon, Anne F.; Sadler, Jon; Hannah, David M. (2021-10-06)
Danny Croghan, Kieran Khamis, Chris Bradley, Anne F. Van Loon, Jon Sadler, David M. Hannah, Combining in-situ fluorometry and distributed rainfall data provides new insights into natural organic matter transport dynamics in an urban river, Science of The Total Environment, Volume 755, Part 1, 2021, 142731, ISSN 0048-9697, https://doi.org/10.1016/j.scitotenv.2020.142731
© 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
https://creativecommons.org/licenses/by/4.0/
https://urn.fi/URN:NBN:fi-fe2022020111648
Tiivistelmä
Abstract
Urbanization alters the quality and quantity of Dissolved Organic Matter (DOM) fluxes to rivers potentially leading to water quality problems and impaired ecosystem function. Traditional synoptic and point sampling approaches are generally inadequate for monitoring DOM source dynamics. To identify links between spatial heterogeneity in precipitation and DOM dynamics, we used a unique approach combining high spatial and temporal resolution precipitation datasets featuring point, catchment, and land-cover weighted precipitation to characterise catchment transport dynamics. These datasets were linked to fluorescence records from an urban stream (Bourn Brook, Birmingham, UK). Humic-like fluorescence (HLF: Ex. 365 nm, Em. 490 nm) and Tryptophan-like fluorescence (TLF: Ex. 285 nm, Em. 340 nm) were measured, (plus river flow and turbidity) at 5 min intervals for 10 weeks during Autumn 2017. The relationship between discharge (Q) and concentration (C) for TLF and HLF were strongly chemodynamic at low Q (
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