Virkkala, A.-M., Wargowsky, I., Vogt, J., Kuhn, M., Madaan, S., O'Keefe, R., Windholz, T., Arndt, K. A., Rogers, B., Watts, J. D., Goeckede, M., Schuur, E. A. G., Rocher-Ros, G., Bastviken, D., Olefeldt, D., Kent, K., Aalstad, K., Aho, K., Ala-Konni, J., … Natali, S. (2025). ABCFlux v2: Arctic-Boreal CO2 and CH4 In-situ Flux and Environmental Data (Version 1). ORNL Distributed Active Archive Center. https://doi.org/10.3334/ORNLDAAC/2448 Date Accessed: 2026-08-14

@article{virkkala_wargowsky_vogt_kuhn_madaan_o'keefe_windholz_arndt_rogers_watts_et al._2025, title={ABCFlux v2: Arctic-Boreal CO2 and CH4 In-situ Flux and Environmental Data}, url={https://www.earthdata.nasa.gov/data/catalog/ornl-cloud-arctic-boreal-co2-flux-v2-2448-1}, DOI={10.3334/ORNLDAAC/2448}, abstractNote={This dataset is a synthesis of terrestrial and freshwater CO2 and CH4 fluxes from the Arctic-Boreal region aggregated to monthly timesteps. The dataset, known as ABCFlux v2, includes 1,024 unique sites and spans 1984-2024 with the majority of observations occurring after 1999. ABCFlux v2 includes surface-atmosphere CO2 fluxes of net ecosystem exchange (NEE), gross primary production (GPP), and ecosystem respiration (Reco) alongside CH4 fluxes. For aquatic ecosystems, CH4 fluxes were split into diffusive and ebullitive flux pathways and included potential emissions from transient storage in the water column, alongside CO2 and CH4 concentrations dissolved in the surface water. Fluxes were measured through a variety of methods including chamber and eddy covariance techniques alongside bubble traps, ice-surveys, and concentration-based turbulence-driven modeling in aquatic ecosystems. Supporting variables include methodological metadata (e.g., gap-filling methods, number of chamber measurement days), environmental measurements (e.g., air, water, and soil temperatures), and site-level attributes (e.g., permafrost thaw status, disturbance history). Compared with version 1, this v2 dataset includes additional variables to represent detailed descriptions of plant functional types, deep soil temperatures (<10 cm), and permafrost thaw presence or absence in the top two meters. Data pertaining to CH4 fluxes were also added that were not included in previous version. The data are provided in two comma separated values (CSV) files that separate terrestrial and aquatic sites.}, publisher={ORNL Distributed Active Archive Center}, author={Virkkala, A-M. and Wargowsky, I. and Vogt, J. and Kuhn, M. and Madaan, S. and O'Keefe, R. and Windholz, T. and Arndt, K.A. and Rogers, B. and Watts, J.D. and Goeckede, M. and Schuur, E.A.G. and Rocher-Ros, G. and Bastviken, D. and Olefeldt, D. and Kent, K. and Aalstad, K. and Aho, K. and Ala-Konni, J. and Alcock, H. and Althuizen, I. and Arp, C.D. and Asanuma, J. and Attermeyer, K. and Aurela, M. and Balathandayuthabani, S. and Barr, A. and Barret, M. and Batkhishig, O. and Biasi, C. and Bjorkman, M.P. and Black, T.A. and Blanc-Betes, E. and Bodmer, P. and Boike, J. and Bolek, A. and Bouchard, F. and Bussmann, I. and Cabrol, L. and Canfora, E. and Carey, S. and Castro-Morales, K. and Chae, N. and Christen, A. and Christensen, T.R. and Christiansen, C.T. and Chu, H. and Clark, G. and Clayer, F. and Crill, P.M. and Cunada, C. and Davidson, S.J. and Dean, J.F. and Dengel, S. and Detto, M. and Dieleman, C. and Domine, F. and Dyukarev, E. and Edgar, C. and Elberling, B. and Emmerton, C.A. and Euskirchen, S.E. and Falvo, G. and Friborg, T. and Garneau, M. and Giamberini, M. and Glagolev, M.V. and Gonzalez-Meler, M.A. and Granath, G. and Gudmundsson, J. and Happonen, K. and Harazono, Y. and Harris, L. and Hashemi, J. and Hasson, N. and Heerah, J. and Heffernan, L. and Helbig, M. and Helgason, W. and Heliasz, M. and Henry, G. and Hensgens, G. and Hiyama, T. and Hock, M. and Holl, D. and Holmes, B. and Holst, J. and Holst, T. and Hould-Gosselin, G. and Humphreys, E. and Hung, J.K.Y. and Huotari, J. and Ikawa, H. and Ilyasov, D.V. and Ishikawa, M. and Iwahana, G. and Iwata, H. and Jackowicz-Korczynski, M.A. and Jansen, J. and Jarveoja, J. and Jassey, V.E. and Jensen, R. and Jentzsch, K. and Jespersen, R.G. and Johannesson, C. and Jones, C.P. and Jonsson, A. and Jung, J.Y. and Juutinen, S. and Kane, E.S. and Karlsson, J. and Karsanaev, S. and Kasak, K. and Kelly, J. and Kempton, K. and Klaus, M. and Kling, G.W. and Kljun, N. and Knutson, J. and Kobayashi, H. and Kochendorfer, J. and Kohonen, K. and Kolari, P. and Korkiakoski, M. and Korrensalo, A. and Kortelainen, P. and Koster, E. and Koster, K. and Kotani, A. and Krishnan, P. and Kurbatova, J. and Kutzbach, L. and Kwon, M.J. and Kyzivat, E.D. and Lagroix, J. and Langhorst, T. and Lapshina, E. and Larmola, T. and Larsen, K. and Laurion, I. and Ledman, J. and Lee, H. and Leffler, A.J. and Lesack, L. and Lindroth, A. and Lipson, D. and Lohila, A. and Lopez-Blanco, E. and St. Louis, V.L. and Lundin, E. and Luoto, M. and Machimura, T. and Magnani, M. and Malhotra, A. and Maljanen, M. and Mammarella, I. and Mannisto, E. and Marchesini, L.B. and Marsh, P. and Martkainen, P.J. and Marushchak, M.E. and Mastepanov, M. and Mavrovic, A. and Maximov, T. and Minions, C. and Montemayor, M. and Morishita, T. and Murphy, P. and Nadeau, D.F. and Nicholls, E. and Nilsson, M.B. and Niyazova, A. and Norden, J. and Noumonvi, K.D. and Nykanen, H. and Oechel, W. and Ojala, A. and Okadera, T. and Pal, S. and Panov, A.V. and Papakyriakou, T. and Papale, D. and Park, S.J. and Parmentier, F. and Pastorello, G. and Peacock, M. and Peichl, M. and Petrov, R. and Pierre, K.S. and Pirk, N. and Plein, J. and Preskienis, V. and Prokushkin, A. and Pumpanen, J. and Rains, H.A. and Rakos, N. and Rasanen, A. and Rautakoski, H. and Rinnan, R. and Rinne, J. and Rocha, A.V. and Roulet, N.T. and Roy, A. and Rutgersson, A. and Sabrekov, A.F. and Sachs, T. and Sahlee, E. and Salazar, A. and Sawakuchi, H.O. and Schulze, C. and Seco, R. and Sepulveda-Jauregui, A. and Serikova, S. and Serrone, A. and Silvennoinen, H.M. and Sjogersten, S. and Skeeter, J. and Snoalv, J. and Sobek, S. and Sonnentag, O. and Stanley, E.H. and Strack, M. and Strom, L. and Sullivan, P. and Sullivan, R.C. and Sytiuk, A. and Tagesson, T. and Taillardat, P. and Talbot, J. and Tank, S.E. and Tenuta, M. and Terenteva, I. and Thalasso, F. and Thiboult, A. and Thorgeirsson, H. and Tigreros, F.G. and Torn, M. and Townsend-Small, A. and Treat, C. and Tremblay, A. and Trotta, C. and Tuittila, E.S. and Turetsky, M. and Ueyama, M. and Umair, M. and Vaha, A. and van Delden, L. and van Hardenbroek, M.V. and Varlagin, A. and Varner, R.K. and Veretennikova, E. and Vesala, T. and Virtanen, T. and Voigt, C. and Vonk, J.E. and Wagner, R. and Walter Anthony, K. and Wang, Q. and Watanabe, M. and Webb, H. and Welker, J. and Westergaard-Nielsen, A. and Westermann, S. and White, J.R. and Wille, C. and Williamson, S. and Zolkos, S. and Zona, D. and Natali, S.}, year={2025}, language={en}, }

Virkkala, A.-M., Wargowsky, I., Vogt, J., Kuhn, M., Madaan, S., O'Keefe, R., Windholz, T., Arndt, K. A., Rogers, B., Watts, J. D., Goeckede, M., Schuur, E. A. G., Rocher-Ros, G., Bastviken, D., Olefeldt, D., Kent, K., Aalstad, K., Aho, K., Ala-Konni, J., … Natali, S. (2025). ABCFlux v2: Arctic-Boreal CO2 and CH4 In-situ Flux and Environmental Data (Version 1). ORNL Distributed Active Archive Center. https://doi.org/10.3334/ORNLDAAC/2448 Date Accessed: 2026-08-14

Virkkala, A-M., et al. “ABCFlux v2: Arctic-Boreal CO2 and CH4 In-Situ Flux and Environmental Data.” With ORNL DAAC, Version 1, ORNL Distributed Active Archive Center, 1 Jan. 2025, https://doi.org/10.3334/ORNLDAAC/2448. Date Accessed: 2026-08-14