If you have difficulty accessing, downloading, or interpreting any of these datasets please get in touch with me (w.heffernan@vu.nl).
Greenhouse gas fluxes and their climatic controls from permafrost peatlands undergoing succession after permafrost thaw
https://doi.org/10.5683/SP3/TLGNGB
The data provided in one xlsx file has two tabs: read me, and data. “Read me” contains descriptions of all column headers and data. It provides units of measurement for each. “Data” contains 1,071 net ecosystem exchange (NEE), 1,201 ecosystem respiration (ER), 1,007 gross primary production (GPP), and 960 methane (CH4) flux measurements collected from 2016-2018. It also contains where along two permafrost thaw transects the measurements were taken, the date they were taken, and environmental data (water table, soil temperature, photosynthetically active radiation) measured at the same time as each flux measurement. These flux measurements and corresponding environmental data were used to construct flux models and estimate annual greenhouse gfs balances. (2024-06-11)
Associated publications
Heffernan, L., Estop-Aragonés, C., Kuhn, M. A., Holger-Knorr, K., & Olefeldt, D. (2024). Changing climatic controls on the greenhouse gas balance of thermokarst bogs during succession after permafrost thaw. Global Change Biology, 30, e17388. https://doi.org/10.1111/gcb.17388
Terrestrial dissolved organic carbon in northern permafrost from 2000 – 2022
https://doi.org/10.17043/heffernan-2024-doc-1
This dataset contains dissolved organic carbon (DOC) concentrations and ancillary biogeochemical and environmental data, collected from previously published articles across the circumpolar permafrost north. The dataset highlights patterns in DOC concentrations across 8 different terrestrial ecosystem types, highlights potentially vulnerable areas to DOC mobilization upon permafrost thaw, and assesses an important fraction in constraining uncertainty in the magnitude and location of the permafrost carbon feedback. The dataset was generated after performing a systematic review of publications pertaining to terrestrial DOC concentrations in the top 3 metres of the northern circumpolar permafrost region. It contains 2,276 DOC concentrations collected extracted from 111 peer-reviewed articles published between 2000 and 2022.
Associated publications
Heffernan, L., Kothawala, D. N., and Tranvik, L. J.: Review article: A systematic review of terrestrial dissolved organic carbon in northern permafrost, The Cryosphere Discuss. [preprint], https://doi.org/10.5194/tc-2023-152, in print, 2024.
High peatland methane emissions following permafrost thaw: enhanced acetoclastic methanogenesis during early successional stages
https://doi.org/10.5683/SP3/5TSH9V
This dataset is in one xlsx file and has six tabs: read me, porewater chemistry, enzymes, GHG fluxes, flux isotopes, dissolved gas concentrations and isotopes. “Read me” contains descriptions of all column headers and data. It provides units of measurement for each.
Associated publications
Heffernan, L., Cavaco, M. A., Bhatia, M. P., Estop-Aragonés, C., Knorr, K.-H., Olefeldt, D. High peatland methane emissions following permafrost thaw: enhanced acetoclastic methanogenesis throughout the peat profile during early successional stages. Biogeosciences, 19, 3051–3071, 2022. https://doi.org/10.5194/bg-19-3051-2022
Heffernan, L., Jassey, V. E. J., Frederickson, M., MacKenzie, M. D., & Olefeldt, D. (2021). Constraints on potential enzyme activities in thermokarst bogs: Implications for the carbon balance of peatlands following thaw. Global Change Biology, 00, 1-16. https://doi.org/10.1111/gcb.15758
Northern Alberta Permafrost microbial diversity along peat and porewater cores
https://www.ncbi.nlm.nih.gov/bioproject/PRJNA660023
Samples encompass depth profiles down to 160 cm of ancient, unthawed permafrost, thawed, mature peat and porewater samples, to newly thawed peat and porewater samples. Samples were obtained from permafrost originating from Northern Alberta.
Associated publication
Heffernan, L., Cavaco, M. A., Bhatia, M. P., Estop-Aragonés, C., Knorr, K.-H., Olefeldt, D. High peatland methane emissions following permafrost thaw: enhanced acetoclastic methanogenesis throughout the peat profile during early successional stages. Biogeosciences, 19, 3051–3071, 2022. https://doi.org/10.5194/bg-19-3051-2022
Peat carbon, δ14C, macrofossil, and humification data from a thawing permafrost peatland in western Canada
https://doi.org/10.7939/DVN/MKM0ZE
The data provided in one xlsx file has five tabs: read me, bulk density and LOI, carbon content, FTIR and C:N, radiocarbon, and plant macrofossils. The same data is available in separate csv files and all data files are included in one zip file, except for a read me file which is in txt format.. “Read me” contains descriptions of all column headers and data. It provides units of measurement for each.
Associated publication
Heffernan, L., Estop-Aragonés, C., Knorr, K.-H., Talbot, J., & Olefeldt, D. (2020). Long-term impacts of permafrost thaw on carbon storage in peatlands: Deep losses offset by surficial accumulation. Journal of Geophysical Research: Biogeosciences, 125, e2019JG005501. https://doi.org/10.1029/2019JG005501
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