Introduction to the Methane flux calculator
Welcome to this website which helps to calculate fluxes. The website allows the user to separate ebullitive (bubble) and diffusive fluxes. The technique for separation ebullitive and diffusive fluxes is based on the R-package FluxSeparator with minor alterations. Similar results can be obtained by using the R-package in R, however, this website allows for easy usage and testing how different parameters affect your fluxes.This website was originally made to ease the usage of DIY sensors for CH4 and CO2 supplied by the author. Nevertheless, increasing interest fueled me to incorporate other types of sensors.
Where to start
Start by selecting the 'Start' tab on the left side, here you can upload your data and make sure the formatting is correct. Before uploading the data a selection can be made whether to use 'DIY' sensors, which refers to paper just above, or 'Other' which can be any format. The 'Start' page also displays your data, allowing you to zoom in on particular areas and calculate the flux from these areas. After uploading the data and ensuring it all looks good, you can head on to one of the next tabs for calculating either ebullitive or diffusive fluxes.Theory behind the calculations
Ebullitive flux
Most notable is the runvar_cutoff variable which determines the threshold value of the running variance, with running variances above this threshold being considered bubbles. Furthermore, selections allow the user to include more or less observations before and after the bubble, or set a minimum threshold for the concentration change caused by the ebullitive event.Diffusive flux
The diffusive flux allows the user to also consider the bubbles from the ebullitive flux function. If this is selected the function will only calculate diffuisve fluxes before any bubbles occur, to ensure concentrations are not elevated. A possibility to not look for bubbles is also present, which is useful when looking at CO2 fluxes. For more information on how to use the different parameters and how the separation of fluxes is done, see this paperCiting this tool
Please cite the paper introducing the R-package and the R-package when using this tool:Sø, J. S., Sand-Jensen, K., & Kragh, T. (2024). Self-made equipment for automatic methane diffusion and ebullition measurements from aquatic environments. Journal of Geophysical Research: Biogeosciences, 129, e2024JG008035. https://doi.org/10.1029/2024JG008035
Sø, J. S., Sand-Jensen, K., & Kragh, T. (2023). FluxSeparator - Separation of diffusive and ebullitive fluxes (v1.0.0). Zenodo. https://doi.org/10.5281/zenodo.8297154
Wrapping up
I expect there will be encounters of errors while using the website, which I would gladly try to accomodate, so please let me know. Additionally, don't hesitate to contact me if you have ideas on how to improve this website.This website is made by Jonas Stage Sø , Ph.D., Postdoc at The University of Southern Denmark.
We thank Kenneth T. Martinsen for help developing this app
Methane sensor calculations
A preview of you data will show here to help ensure data is correctly formatted. If the preview does not appear as a table try altering the amount of rows that are to be skipped
Use sliders to adjust the x-axis
Zoom plot
Use mouse to select measurements in the main plot
Save flux of zoom plot
Flux ID (optional):
Table with saved data, export table as '.csv' file using the download button
Download flux data as csvDownload