Please use this identifier to cite or link to this item: http://hdl.handle.net/1893/30335
Appears in Collections:Biological and Environmental Sciences Journal Articles
Peer Review Status: Refereed
Title: Wide-spread inconsistency in estimation of lake mixed depth impacts interpretation of limnological processes
Author(s): Gray, Emma
Mackay, Eleanor B
Elliott, J Alex
Folkard, Andrew M
Jones, Ian D
Contact Email: ian.jones@stir.ac.uk
Keywords: Mixed depth
Lake
Phytoplankton
Oxygen
Euphotic depth
Issue Date: Jan-2020
Citation: Gray E, Mackay EB, Elliott JA, Folkard AM & Jones ID (2020) Wide-spread inconsistency in estimation of lake mixed depth impacts interpretation of limnological processes. Water Research, 168, Art. No.: 115136. https://doi.org/10.1016/j.watres.2019.115136
Abstract: The mixed layer, or epilimnion, is a physical concept referring to an isothermal layer at the surface of a water body. This concept is ubiquitous within limnology, is fundamental to our understanding of chemical and ecological processes, and is an important metric for water body monitoring, assessment and management. Despite its importance as a metric, many different approaches to approximating mixed depth currently exist. Using data from field campaigns in a small meso-eutrophic lake in the UK in 2016 and 2017 we tested whether different definitions of mixed depth resulted in comparable estimates and whether variables other than temperature could be assumed to be mixed within the layer. Different methods resulted in very different estimates for the mixed depth and ecologically important variables were not necessarily homogenously spread through the epilimnion. Furthermore, calculation of simple ecologically relevant metrics based on mixed depth showed that these metrics were highly dependent on the definition of mixed depth used. The results demonstrate that an idealised concept of a well-defined fully mixed layer is not necessarily appropriate. The widespread use of multiple definitions for mixed depth impairs the comparability of different studies while associated uncertainty over the most appropriate definition limits the confirmability of studies utilising the mixed depths.
DOI Link: 10.1016/j.watres.2019.115136
Rights: This item has been embargoed for a period. During the embargo please use the Request a Copy feature at the foot of the Repository record to request a copy directly from the author. You can only request a copy if you wish to use this work for your own research or private study. Accepted refereed manuscript of: Gray E, Mackay EB, Elliott JA, Folkard AM & Jones ID (2020) Wide-spread inconsistency in estimation of lake mixed depth impacts interpretation of limnological processes. Water Research, 168, Art. No.: 115136. DOI: https://doi.org/10.1016/j.watres.2019.115136 © 2019, Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/

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