Articles | Volume 20, issue 1
https://doi.org/10.5194/tc-20-535-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/tc-20-535-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
22 Jan 2026
Research article |
| 22 Jan 2026
| 22 Jan 2026
Biogeochemical shifts during Arctic spring: potential reduction of CH4 and N2O emissions driven by surfactants in the sea-surface microlayer
Lina A. Holthusen
CORRESPONDING AUTHOR
Institute for Chemistry and Biology of the Marine Environment, Carl von Ossietzky Universität Oldenburg, Wilhelmshaven, Germany
Chemical Oceanography Research Unit, GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany
Hermann W. Bange
Chemical Oceanography Research Unit, GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany
Thomas H. Badewien
Institute for Chemistry and Biology of the Marine Environment, Carl von Ossietzky Universität Oldenburg, Wilhelmshaven, Germany
Julia C. Muchowski
Swedish Polar Research Secretariat, Luleå, Sweden
Tina Santl-Temkiv
Department of Biology, Microbiology, Aarhus University, Aarhus, Denmark
Arctic Research Centre, Aarhus University, Aarhus, Denmark
Jennie Spicker Schmidt
Department of Biology, Microbiology, Aarhus University, Aarhus, Denmark
Arctic Research Centre, Aarhus University, Aarhus, Denmark
Oliver Wurl
Institute for Chemistry and Biology of the Marine Environment, Carl von Ossietzky Universität Oldenburg, Wilhelmshaven, Germany
Damian L. Arévalo-Martínez
Chemical Oceanography Research Unit, GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany
Institute of Geosciences, Kiel University, Kiel, Germany
Department of Microbiology, Radboud University, Nijmegen, the Netherlands
Marine Chemistry Department, Leibniz Institute for Baltic Sea Research Warnemünde, Rostock, Germany
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John Prytherch, Sonja Murto, Ian Brown, Adam Ulfsbo, Brett F. Thornton, Volker Brüchert, Michael Tjernström, Anna Lunde Hermansson, Amanda T. Nylund, and Lina A. Holthusen
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Sonja Gindorf, Hermann W. Bange, Dennis Booge, and Annette Kock
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Manuela van Pinxteren, Tiera-Brandy Robinson, Sebastian Zeppenfeld, Xianda Gong, Enno Bahlmann, Khanneh Wadinga Fomba, Nadja Triesch, Frank Stratmann, Oliver Wurl, Anja Engel, Heike Wex, and Hartmut Herrmann
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Yanan Zhao, Dennis Booge, Christa A. Marandino, Cathleen Schlundt, Astrid Bracher, Elliot L. Atlas, Jonathan Williams, and Hermann W. Bange
Biogeosciences, 19, 701–714, https://doi.org/10.5194/bg-19-701-2022, https://doi.org/10.5194/bg-19-701-2022, 2022
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We present here, for the first time, simultaneously measured dimethylsulfide (DMS) seawater concentrations and DMS atmospheric mole fractions from the Peruvian upwelling region during two cruises in December 2012 and October 2015. Our results indicate low oceanic DMS concentrations and atmospheric DMS molar fractions in surface waters and the atmosphere, respectively. In addition, the Peruvian upwelling region was identified as an insignificant source of DMS emissions during both periods.
Wangwang Ye, Hermann W. Bange, Damian L. Arévalo-Martínez, Hailun He, Yuhong Li, Jianwen Wen, Jiexia Zhang, Jian Liu, Man Wu, and Liyang Zhan
Biogeosciences Discuss., https://doi.org/10.5194/bg-2021-334, https://doi.org/10.5194/bg-2021-334, 2022
Manuscript not accepted for further review
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Gerd Krahmann, Damian L. Arévalo-Martínez, Andrew W. Dale, Marcus Dengler, Anja Engel, Nicolaas Glock, Patricia Grasse, Johannes Hahn, Helena Hauss, Mark Hopwood, Rainer Kiko, Alexandra Loginova, Carolin R. Löscher, Marie Maßmig, Alexandra-Sophie Roy, Renato Salvatteci, Stefan Sommer, Toste Tanhua, and Hela Mehrtens
Earth Syst. Sci. Data Discuss., https://doi.org/10.5194/essd-2020-308, https://doi.org/10.5194/essd-2020-308, 2021
Preprint withdrawn
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The project "Climate-Biogeochemistry Interactions in the Tropical Ocean" (SFB 754) was a multidisciplinary research project active from 2008 to 2019 aimed at a better understanding of the coupling between the tropical climate and ocean circulation and the ocean's oxygen and nutrient balance. On 34 research cruises, mainly in the Southeast Tropical Pacific and the Northeast Tropical Atlantic, 1071 physical, chemical and biological data sets were collected.
Yanan Zhao, Cathleen Schlundt, Dennis Booge, and Hermann W. Bange
Biogeosciences, 18, 2161–2179, https://doi.org/10.5194/bg-18-2161-2021, https://doi.org/10.5194/bg-18-2161-2021, 2021
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Cited articles
Aslam, S. N., Cresswell-Maynard, T., Thomas, D. N., and Underwood, G. J. C.: Production and Characterization of the Intra- and Extracellular Carbohydrates and Polymeric Substances (EPS) of Three Sea-Ice Diatom Species, and Evidence for a Cryoprotective Role for EPS, J. Phycol., 48, 1494–1509, https://doi.org/10.1111/jpy.12004, 2012.
Assmy, P., Fernández-Méndez, M., Duarte, P., Meyer, A., Randelhoff, A., Mundy, C. J., Olsen, L. M., Kauko, H. M., Bailey, A., Chierici, M., Cohen, L., Doulgeris, A. P., Ehn, J. K., Fransson, A., Gerland, S., Hop, H., Hudson, S. R., Hughes, N., Itkin, P., Johnsen, G., King, J. A., Koch, B. P., Koenig, Z., Kwasniewski, S., Laney, S. R., Nicolaus, M., Pavlov, A. K., Polashenski, C. M., Provost, C., Rösel, A., Sandbu, M., Spreen, G., Smedsrud, L. H., Sundfjord, A., Taskjelle, T., Tatarek, A., Wiktor, J., Wagner, P. M., Wold, A., Steen, H., and Granskog, M. A.: Leads in Arctic pack ice enable early phytoplankton blooms below snow-covered sea ice, Sci. Rep., 7, 40850, https://doi.org/10.1038/srep40850, 2017.
Bakker, D. C. E., Bange, H. W., Gruber, N., Johannessen, T., Upstill-Goddard, R. C., Borges, A. V., Delille, B., Löscher, C. R., Naqvi, S. W. A., Omar, A. M., and Santana-Casiano, J. M.: Air-Sea Interactions of Natural Long-Lived Greenhouse Gases (CO2, N2O, CH4) in a Changing Climate, in: Ocean-atmosphere interactions of gases and particles, edited by: Liss, P. and Liss, P. S., Springer Open, Heidelberg, 113–169, https://doi.org/10.1007/978-3-642-25643-1, 2014.
Barnes, R. O. and Goldberg, E. D.: Methane production and consumption in anoxic marine sediments, Geology, 4, 297, https://doi.org/10.1130/0091-7613(1976)4<297:MPACIA>2.0.CO;2, 1976.
Beszczynska-Möller, A., Fahrbach, E., Schauer, U., and Hansen, E.: Variability in Atlantic water temperature and transport at the entrance to the Arctic Ocean, 1997–2010, ICES J. Mar. Sci., 69, 852–863, https://doi.org/10.1093/icesjms/fss056, 2012.
Bilt, W., Bakke, J., Smedsrud, L., Sund, M., Schuler, T., Westermann, S., Wong, W., Sandven, S., Simpson, M., Skogen, M., Pavlova, O., Ravndal, O., Risebrobakken, B., Saloranta, T., Mezghani, A., Nilsen, F., Nilsen, J., Nilsen, I., Kierulf, H., Kohler, J., Li, H., Lutz, J., and Sorteberg, A.: Climate in Svalbard 2100 – a knowledge base for climate adaptation, Nor. Klimaservicesenter, Norwegian Centre for Climate Services Reports, 105 pp., https://nva.sikt.no/registration/0198cc5ecceb-273f3534-66a4-463c-ab9f-87219bcfcc62 (last access: June 2025), 2019.
Bižić, M., Klintzsch, T., Ionescu, D., Hindiyeh, M. Y., Günthel, M., Muro-Pastor, A. M., Eckert, W., Urich, T., Keppler, F., and Grossart, H.-P.: Aquatic and terrestrial cyanobacteria produce methane, Sci. Adv., 6, eaax5343, https://doi.org/10.1126/sciadv.aax5343, 2020.
Brockmann, U. H., Huhnerfuss, H., Kattner, G., Broecker, H., and Hentzschel, G.: Artificial surface films in the sea area near Sylt1, Limnol. Oceanogr., 27, 1050–1058, https://doi.org/10.4319/lo.1982.27.6.1050, 1982.
Broecker, H., Petermann, J., and Siems, W.: The influence of wind on CO2-exchange in a wind-wave tunnel, including the effects of monolayers, J. Mar. Res., 36, https://elischolar.library.yale.edu/journal_of_marine_research/1445 (last access: November 2025), 1978.
Butterworth, B. J. and Miller, S. D.: Air-sea exchange of carbon dioxide in the Southern Ocean and Antarctic marginal ice zone, Geophys. Res. Lett., 43, 7223–7230, https://doi.org/10.1002/2016GL069581, 2016.
Cantera, J. J. L. and Stein, L. Y.: Role of nitrite reductase in the ammonia-oxidizing pathway of Nitrosomonas europaea, Arch. Microbiol., 188, 349–354, https://doi.org/10.1007/s00203-007-0255-4, 2007.
Castillo, C. R., Sarmento, H., Álvarez-Salgado, X. A., Gasol, J. M., and Marraséa, C.: Production of chromophoric dissolved organic matter by marine phytoplankton, Limnol. Oceanogr., 55, 446–454, https://doi.org/10.4319/lo.2010.55.1.0446, 2010.
Chen, Y. and Wang, F.: Insights on nitrate respiration by Shewanella, Front. Mar. Sci., 1, https://doi.org/10.3389/fmars.2014.00080, 2015.
Ćosović, B. and Vojvodić, V.: Voltammetric Analysis of Surface Active Substances in Natural Seawater, Electroanalysis, 10, 429–434, 1998.
Cramm, M. A., Neves, B. D. M., Manning, C. C. M., Oldenburg, T. B. P., Archambault, P., Chakraborty, A., Cyr-Parent, A., Edinger, E. N., Jaggi, A., Mort, A., Tortell, P., and Hubert, C. R. J.: Characterization of marine microbial communities around an Arctic seabed hydrocarbon seep at Scott Inlet, Baffin Bay, Sci. Total Environ., 762, 143961, https://doi.org/10.1016/j.scitotenv.2020.143961, 2021.
Cunliffe, M. and Wurl, O.: Guide to best practices to study the ocean's surface., Marine Biological Association of the United Kingdom for SCOR, https://doi.org/10.25607/OBP-1512, 2014.
Cunliffe, M., Engel, A., Frka, S., Gašparović, B., Guitart, C., Murrell, J. C., Salter, M., Stolle, C., Upstill-Goddard, R., and Wurl, O.: Sea surface microlayers: A unified physicochemical and biological perspective of the air–ocean interface, Prog. Oceanogr., 109, 104–116, https://doi.org/10.1016/j.pocean.2012.08.004, 2013.
Dalsgaard, T., Stewart, F. J., Thamdrup, B., De Brabandere, L., Revsbech, N. P., Ulloa, O., Canfield, D. E., and DeLong, E. F.: Oxygen at Nanomolar Levels Reversibly Suppresses Process Rates and Gene Expression in Anammox and Denitrification in the Oxygen Minimum Zone off Northern Chile, mBio, 5, e01966-14, https://doi.org/10.1128/mBio.01966-14, 2014.
Damm, E., Kiene, R. P., Schwarz, J., Falck, E., and Dieckmann, G.: Methane cycling in Arctic shelf water and its relationship with phytoplankton biomass and DMSP, Mar. Chem., 109, 45–59, https://doi.org/10.1016/j.marchem.2007.12.003, 2008.
Damm, E., Helmke, E., Thoms, S., Schauer, U., Nöthig, E., Bakker, K., and Kiene, R. P.: Methane production in aerobic oligotrophic surface water in the central Arctic Ocean, Biogeosciences, 7, 1099–1108, https://doi.org/10.5194/bg-7-1099-2010, 2010.
Damm, E., Rudels, B., Schauer, U., Mau, S., and Dieckmann, G.: Methane excess in Arctic surface water- triggered by sea ice formation and melting, Sci. Rep., 5, 16179, https://doi.org/10.1038/srep16179, 2015a.
Damm, E., Thoms, S., Beszczynska-Möller, A., Nöthig, E. M., and Kattner, G.: Methane excess production in oxygen-rich polar water and a model of cellular conditions for this paradox, Polar Sci., 9, 327–334, https://doi.org/10.1016/j.polar.2015.05.001, 2015b.
E.U. Copernicus Marine Service Information: Arctic Ocean physics reanalysis, Marine Data Store (MDS), product ARCTIC_MULTIYEAR_PHY_002_003, https://doi.org/10.48670/moi-00007, 2025.
Fenwick, L., Capelle, D., Damm, E., Zimmermann, S., Williams, W. J., Vagle, S., and Tortell, P. D.: Methane and nitrous oxide distributions across the North American Arctic Ocean during summer, 2015, J. Geophys. Res. Oceans, 122, 390–412, https://doi.org/10.1002/2016JC012493, 2017.
Galgani, L., Piontek, J., and Engel, A.: Biopolymers form a gelatinous microlayer at the air-sea interface when Arctic sea ice melts, Sci. Rep., 6, 29465, https://doi.org/10.1038/srep29465, 2016.
Gao, Q., Leck, C., Rauschenberg, C., and Matrai, P. A.: On the chemical dynamics of extracellular polysaccharides in the high Arctic surface microlayer, Ocean Sci., 8, 401–418, https://doi.org/10.5194/os-8-401-2012, 2012.
Guo, H., Song, L., Wang, X., Huang, J., Zhang, X., Zhang, Y., Zhu, W., Song, W., Chen, H., Bo, J., Zhang, P., Cao, G., and Luo, Z.: Cold adaptation of harmful dinoflagellate facilitates their poleward colonization: Insights into extracellular polymeric substances and intracellular bio-macromolecules dynamics through in-situ FTIR imaging, Int. J. Biol. Macromol., 309, 143054, https://doi.org/10.1016/j.ijbiomac.2025.143054, 2025.
Harvey, G. W. and Burzell, L. A.: A SIMPLE MICROLAYER METHOD FOR SMALL SAMPLES1, Limnol. Oceanogr., 17, 156–157, https://doi.org/10.4319/lo.1972.17.1.0156, 1972.
Holthusen, L. A., Muchowski, J., Planat, N., Bange, H. W., and Wurl, O.: Surfactants in the Sea-Surface Microlayer and dissolved CH4 and N2O from expedition ARTofMELT, Arctic Ocean, 2023, Bolin Centre Database [data set], https://doi.org/10.17043/oden-artofmelt-2023-surfactants-1, 2025.
Holthusen, L. A., Planat, N., Asmussen, M., and Muchowski, J.: Oceanographic CTD data from vertical microstructure profiler (VMP) from expedition ARTofMELT, Arctic Ocean, 2023, Bolin Centre Database [data set], https://doi.org/10.17043/oden-artofmelt-2023-ctd-1, 2025.
Holthusen, L. A., Bange, H. W., Arévalo-Martínez, D. L., Badewien, T. H., Höfer, J., Löscher, C. R., Marín-Arias, C., Meyerjürgens, J., Schlangen, I., and Wurl, O.: Glacial meltwater drives high CH4 supersaturation in Maxwell Bay, King George Island (Southern Ocean), Limnol. Oceanogr. Lett., lol2.70045, https://doi.org/10.1002/lol2.70045, 2025.
Huang, J., Zhang, X., Zhang, Q., Lin, Y., Hao, M., Luo, Y., Zhao, Z., Yao, Y., Chen, X., Wang, L., Nie, S., Yin, Y., Xu, Y., and Zhang, J.: Recently amplified arctic warming has contributed to a continual global warming trend, Nat. Clim. Change, 7, 875–879, https://doi.org/10.1038/s41558-017-0009-5, 2017.
IPCC: Climate Change 2021: The Physical Science Basis. Contribution of Working Group I to the Sixth Assessment Report of the Intergovernmental Panel on Climate Change, edited by: Masson-Delmotte, V., Zhai, P., Pirani, A., Connors, S. L., Péan, C., Berger, S., Caud, N., Chen, Y., Goldfarb, L., Gomis, M. I., Huang, M., Leitzell, K., and Lonnoy, E., Cambridge University Press, Cambridge, United Kingdom and New York, NY, USA, 2391 pp., https://doi.org/10.1017/9781009157896, 2021.
James, R. H., Bousquet, P., Bussmann, I., Haeckel, M., Kipfer, R., Leifer, I., Niemann, H., Ostrovsky, I., Piskozub, J., Rehder, G., Treude, T., Vielstädte, L., and Greinert, J.: Effects of climate change on methane emissions from seafloor sediments in the Arctic Ocean: A review, Limnol. Oceanogr., 61, https://doi.org/10.1002/lno.10307, 2016.
Ji, Q., Buitenhuis, E., Suntharalingam, P., Sarmiento, J. L., and Ward, B. B.: Global Nitrous Oxide Production Determined by Oxygen Sensitivity of Nitrification and Denitrification, Glob. Biogeochem. Cycles, 32, 1790–1802, https://doi.org/10.1029/2018GB005887, 2018.
Karl, D. M., Beversdorf, L., Björkman, K. M., Church, M. J., Martinez, A., and Delong, E. F.: Aerobic production of methane in the sea, Nat. Geosci., 1, 473–478, https://doi.org/10.1038/ngeo234, 2008.
Kitidis, V., Upstill-Goddard, R. C., and Anderson, L. G.: Methane and nitrous oxide in surface water along the North-West Passage, Arctic Ocean, Mar. Chem., 121, 80–86, https://doi.org/10.1016/j.marchem.2010.03.006, 2010.
Knulst, J. C., Rosenberger, D., Thompson, B., and Paatero, J.: Intensive Sea Surface Microlayer Investigations of Open Leads in the Pack Ice during Arctic Ocean 2001 Expedition, Langmuir, 19, 10194–10199, https://doi.org/10.1021/la035069+, 2003.
Krembs, C., Eicken, H., Junge, K., and Deming, J. W.: High concentrations of exopolymeric substances in Arctic winter sea ice: implications for the polar ocean carbon cycle and cryoprotection of diatoms, Deep Sea Res. Part Oceanogr. Res. Pap., 49, 2163–2181, https://doi.org/10.1016/S0967-0637(02)00122-X, 2002.
Leck, C. and Bigg, E. K.: Biogenic particles in the surface microlayer and overlaying atmosphere in the central Arctic Ocean during summer, Tellus B Chem. Phys. Meteorol., 57, 305, https://doi.org/10.3402/tellusb.v57i4.16546, 2005.
Leon-Palmero, E., Morales-Baquero, R., Thamdrup, B., Löscher, C., and Reche, I.: Sunlight drives the abiotic formation of nitrous oxide in fresh and marine waters, Science, 387, 1198–1203, https://doi.org/10.1126/science.adq0302, 2025.
Li, J., Xu, M., Wang, J., Lan, C., and Lai, J.: Effects of nutrient limitation on cell growth, exopolysaccharide secretion and TEP production of Phaeocystis globosa, Mar. Environ. Res., 183, 105801, https://doi.org/10.1016/j.marenvres.2022.105801, 2023.
Li, Y., Fichot, C. G., Geng, L., Scarratt, M. G., and Xie, H.: The Contribution of Methane Photoproduction to the Oceanic Methane Paradox, Geophys. Res. Lett., 47, https://doi.org/10.1029/2020GL088362, 2020.
Liss, P. S. and Duce, R. A. (Eds.): The sea surface and global change, Cambridge University Press, Cambridge, New York, 519 pp., ISBN 978-0-521-56273-7, 1997.
Löscher, C. R., Kock, A., Könneke, M., LaRoche, J., Bange, H. W., and Schmitz, R. A.: Production of oceanic nitrous oxide by ammonia-oxidizing archaea, Biogeosciences, 9, 2419–2429, https://doi.org/10.5194/bg-9-2419-2012, 2012.
Mao, Y., Lin, T., Li, H., He, R., Ye, K., Yu, W., and He, Q.: Aerobic methane production by phytoplankton as an important methane source of aquatic ecosystems: Reconsidering the global methane budget, Sci. Total Environ., 907, 167864, https://doi.org/10.1016/j.scitotenv.2023.167864, 2024.
McKenna, S. P. and McGillis, W. R.: The role of free-surface turbulence and surfactants in air–water gas transfer, Int. J. Heat Mass Transf., 47, 539–553, https://doi.org/10.1016/j.ijheatmasstransfer.2003.06.001, 2004.
Muchowski, J. C., Planat, N., Holthusen, L. A., and Asmussen, M.: Oceanographic conductivity, temperature, and depth (CTD) data from expedition ARTofMELT, Arctic Ocean, 2023, Bolin Centre Database [data set], https://doi.org/10.17043/oden-artofmelt-2023-vmp-ctd-1, 2025.
Muller, S., Fripiat, F., Jaccard, S. L., Ponsoni, L., Hölemann, J. A., Martínez-García, A., and Delille, B.: Nitrous oxide dynamics in the Kara Sea, Arctic Ocean, Front. Mar. Sci., 11, 1497360, https://doi.org/10.3389/fmars.2024.1497360, 2024.
Murto, Sonja, Tjernström, Michael, Karalis, Michail, and Prytherch, John: Wind, temperature, relative humidity, surface temperature and radiation from expedition ARTofMELT, Arctic Ocean, 2023, https://doi.org/10.17043/ODEN-ARTOFMELT-2023-WEATHER-STATION-1, 2024.
Mustaffa, N. I. H., Ribas-Ribas, M., Banko-Kubis, H. M., and Wurl, O.: Global reduction of in situ CO2 transfer velocity by natural surfactants in the sea-surface microlayer, Proc. R. Soc. Math. Phys. Eng. Sci., 476, 20190763, https://doi.org/10.1098/rspa.2019.0763, 2020.
NOAA ESRL GML CCGG Group: Earth System Research Laboratory Carbon Cycle and Greenhouse Gases Group Flask-Air Sample Measurements of N2O at Global and Regional Background Sites, 1967–Present, https://doi.org/10.15138/53G1-X417, 2019.
Orellana, M. V., Matrai, P. A., Leck, C., Rauschenberg, C. D., Lee, A. M., and Coz, E.: Marine microgels as a source of cloud condensation nuclei in the high Arctic, Proc. Natl. Acad. Sci., 108, 13612–13617, https://doi.org/10.1073/pnas.1102457108, 2011.
Orellana, M. V., Hansell, D. A., Matrai, P. A., and Leck, C.: Marine Polymer-Gels' Relevance in the Atmosphere as Aerosols and CCN, Gels, 7, 185, https://doi.org/10.3390/gels7040185, 2021.
Orsi, A. H., Whitworth, T., and Nowlin, W. D.: On the meridional extent and fronts of the Antarctic Circumpolar Current, Deep Sea Res. Part Oceanogr. Res. Pap., 42, 641–673, https://doi.org/10.1016/0967-0637(95)00021-W, 1995.
Ortega-Retuerta, E., Reche, I., Pulido-Villena, E., Agustí, S., and Duarte, C. M.: Uncoupled distributions of transparent exopolymer particles (TEP) and dissolved carbohydrates in the Southern Ocean, Mar. Chem., 115, 59–65, https://doi.org/10.1016/j.marchem.2009.06.004, 2009.
Pereira, R., Schneider-Zapp, K., and Upstill-Goddard, R. C.: Surfactant control of gas transfer velocity along an offshore coastal transect: results from a laboratory gas exchange tank, Biogeosciences, 13, 3981–3989, https://doi.org/10.5194/bg-13-3981-2016, 2016.
Pereira, R., Ashton, I., Sabbaghzadeh, B., Shutler, J. D., and Upstill-Goddard, R. C.: Reduced air–sea CO2 exchange in the Atlantic Ocean due to biological surfactants, Nat. Geosci., 11, 492–496, https://doi.org/10.1038/s41561-018-0136-2, 2018.
Prytherch, J. and Yelland, M. J.: Wind, Convection and Fetch Dependence of Gas Transfer Velocity in an Arctic Sea-Ice Lead Determined From Eddy Covariance CO2 Flux Measurements, Glob. Biogeochem. Cycles, 35, e2020GB006633, https://doi.org/10.1029/2020GB006633, 2021.
Prytherch, J., Murto, S., Brown, I., Ulfsbo, A., Thornton, B. F., Brüchert, V., Tjernström, M., Hermansson, A. L., Nylund, A. T., and Holthusen, L. A.: Central Arctic Ocean surface–atmosphere exchange of CO2 and CH4 constrained by direct measurements, Biogeosciences, 21, 671–688, https://doi.org/10.5194/bg-21-671-2024, 2024a.
Prytherch, J., Brooks, I., Guy, H., Karalis, M., Murto, S., and Tjernström, M.: Micrometeorological data from icebreaker Oden's foremast during expedition ARTofMELT, Arctic Ocean, 2023, https://doi.org/10.17043/ODEN-ARTOFMELT-2023-MICROMET-ODEN-1, 2024b.
Randall, K., Scarratt, M., Levasseur, M., Michaud, S., Xie, H., and Gosselin, M.: First measurements of nitrous oxide in Arctic sea ice, J. Geophys. Res. Oceans, 117, 2011JC007340, https://doi.org/10.1029/2011JC007340, 2012.
Reeburgh, W. S.: Oceanic methane biogeochemistry, Chem. Rev., 107, 486–513, https://doi.org/10.1021/cr050362v, 2007.
Rees, A. P., Brown, I. J., Jayakumar, A., Lessin, G., Somerfield, P. J., and Ward, B. B.: Biological nitrous oxide consumption in oxygenated waters of the high latitude Atlantic Ocean, Commun. Earth Environ., 2, 36, https://doi.org/10.1038/s43247-021-00104-y, 2021.
Rees, A. P., Bange, H. W., Arévalo-Martínez, D. L., Artioli, Y., Ashby, D. M., Brown, I., Campen, H. I., Clark, D. R., Kitidis, V., Lessin, G., Tarran, G. A., and Turley, C.: Nitrous oxide and methane in a changing Arctic Ocean, Ambio, 51, 398–410, https://doi.org/10.1007/s13280-021-01633-8, 2022.
Repeta, D. J., Ferrón, S., Sosa, O. A., Johnson, C. G., Repeta, L. D., Acker, M., DeLong, E. F., and Karl, D. M.: Marine methane paradox explained by bacterial degradation of dissolved organic matter, Nat. Geosci., 9, 884–887, https://doi.org/10.1038/ngeo2837, 2016.
Ribas-Ribas, M., Helleis, F., Rahlff, J., and Wurl, O.: Air-Sea CO2-Exchange in a Large Annular Wind-Wave Tank and the Effects of Surfactants, Front. Mar. Sci., 5, 457, https://doi.org/10.3389/fmars.2018.00457, 2018.
Rickard, P. C., Uher, G., Upstill-Goddard, R. C., Frka, S., Mustaffa, N. I. H., Banko-Kubis, H. M., Cvitešić Kušan, A., Gašparović, B., Stolle, C., Wurl, O., and Ribas-Ribas, M.: Reconsideration of seawater surfactant activity analysis based on an inter-laboratory comparison study, Mar. Chem., 208, 103–111, https://doi.org/10.1016/j.marchem.2018.11.012, 2019.
Riebesell, U., Schloss, I., and Smetacek, V.: Aggregation of algae released from melting sea ice: implications for seeding and sedimentation, Polar Biol., 11, https://doi.org/10.1007/BF00238457, 1991.
Riedel, A., Michel, C., and Gosselin, M.: Seasonal study of sea-ice exopolymeric substances on the Mackenzie shelf: implications for transport of sea-ice bacteria and algae, Aquat. Microb. Ecol., 45, 195–206, https://doi.org/10.3354/ame045195, 2006.
Rudels, B., Björk, G., Nilsson, J., Winsor, P., Lake, I., and Nohr, C.: The interaction between waters from the Arctic Ocean and the Nordic Seas north of Fram Strait and along the East Greenland Current: results from the Arctic Ocean-02 Oden expedition, J. Mar. Syst., 55, 1–30, https://doi.org/10.1016/j.jmarsys.2004.06.008, 2005.
Rush, S.C. and Vlahos, P.: Nutrients in seawater, ice, brine, lead, slush, and under-ice water from expedition ARTofMELT, Arctic Ocean 2023, https://doi.org/10.17043/ODEN-ARTOFMELT-2023-NUTRIENTS-1, 2025.
Rutgers Van Der Loeff, M. M., Cassar, N., Nicolaus, M., Rabe, B., and Stimac, I.: The influence of sea ice cover on air-sea gas exchange estimated with radon-222 profiles, J. Geophys. Res. Oceans, 119, 2735–2751, https://doi.org/10.1002/2013JC009321, 2014.
Salter, M. E., Upstill-Goddard, R. C., Nightingale, P. D., Archer, S. D., Blomquist, B., Ho, D. T., Huebert, B., Schlosser, P., and Yang, M.: Impact of an artificial surfactant release on air-sea gas fluxes during Deep Ocean Gas Exchange Experiment II, J. Geophys. Res. Oceans, 116, 2011JC007023, https://doi.org/10.1029/2011JC007023, 2011.
Sander, S. and Henze, G.: AC-voltammetric determination of the total concentration of nonionic and anionic surfactants in aqueous systems, Electroanalysis, 9, 243–246, https://doi.org/10.1002/elan.1140090311, 1997.
Saunois, M., Martinez, A., Poulter, B., Zhang, Z., Raymond, P. A., Regnier, P., Canadell, J. G., Jackson, R. B., Patra, P. K., Bousquet, P., Ciais, P., Dlugokencky, E. J., Lan, X., Allen, G. H., Bastviken, D., Beerling, D. J., Belikov, D. A., Blake, D. R., Castaldi, S., Crippa, M., Deemer, B. R., Dennison, F., Etiope, G., Gedney, N., Höglund-Isaksson, L., Holgerson, M. A., Hopcroft, P. O., Hugelius, G., Ito, A., Jain, A. K., Janardanan, R., Johnson, M. S., Kleinen, T., Krummel, P. B., Lauerwald, R., Li, T., Liu, X., McDonald, K. C., Melton, J. R., Mühle, J., Müller, J., Murguia-Flores, F., Niwa, Y., Noce, S., Pan, S., Parker, R. J., Peng, C., Ramonet, M., Riley, W. J., Rocher-Ros, G., Rosentreter, J. A., Sasakawa, M., Segers, A., Smith, S. J., Stanley, E. H., Thanwerdas, J., Tian, H., Tsuruta, A., Tubiello, F. N., Weber, T. S., van der Werf, G. R., Worthy, D. E. J., Xi, Y., Yoshida, Y., Zhang, W., Zheng, B., Zhu, Q., Zhu, Q., and Zhuang, Q.: Global Methane Budget 2000–2020, Earth Syst. Sci. Data, 17, 1873–1958, https://doi.org/10.5194/essd-17-1873-2025, 2025.
Schlitzer, R.: Ocean Data View, version 5.6.7, https://odv.awi.de (last access: August 2023), 2023.
Simon, M., Grossart, H., Schweitzer, B., and Ploug, H.: Microbial ecology of organic aggregates in aquatic ecosystems, Aquat. Microb. Ecol., 28, 175–211, https://doi.org/10.3354/ame028175, 2002.
Smedsrud, L. H., Muilwijk, M., Brakstad, A., Madonna, E., Lauvset, S. K., Spensberger, C., Born, A., Eldevik, T., Drange, H., Jeansson, E., Li, C., Olsen, A., Skagseth, Ø., Slater, D. A., Straneo, F., Våge, K., and Årthun, M.: Nordic Seas Heat Loss, Atlantic Inflow, and Arctic Sea Ice Cover Over the Last Century, Rev. Geophys., 60, e2020RG000725, https://doi.org/10.1029/2020RG000725, 2022.
Stawiarski, B., Otto, S., Thiel, V., Gräwe, U., Loick-Wilde, N., Wittenborn, A. K., Schloemer, S., Wäge, J., Rehder, G., Labrenz, M., Wasmund, N., and Schmale, O.: Controls on zooplankton methane production in the central Baltic Sea, Biogeosciences, 16, 1–16, https://doi.org/10.5194/bg-16-1-2019, 2019.
Thornton, B. F., Prytherch, J., Andersson, K., Brooks, I. M., Salisbury, D., Tjernström, M., and Crill, P. M.: Shipborne eddy covariance observations of methane fluxes constrain Arctic sea emissions, Sci. Adv., 6, eaay7934, https://doi.org/10.1126/sciadv.aay7934, 2020.
Tian, H., Pan, N., Thompson, R. L., Canadell, J. G., Suntharalingam, P., Regnier, P., Davidson, E. A., Prather, M., Ciais, P., Muntean, M., Pan, S., Winiwarter, W., Zaehle, S., Zhou, F., Jackson, R. B., Bange, H. W., Berthet, S., Bian, Z., Bianchi, D., Bouwman, A. F., Buitenhuis, E. T., Dutton, G., Hu, M., Ito, A., Jain, A. K., Jeltsch-Thömmes, A., Joos, F., Kou-Giesbrecht, S., Krummel, P. B., Lan, X., Landolfi, A., Lauerwald, R., Li, Y., Lu, C., Maavara, T., Manizza, M., Millet, D. B., Mühle, J., Patra, P. K., Peters, G. P., Qin, X., Raymond, P., Resplandy, L., Rosentreter, J. A., Shi, H., Sun, Q., Tonina, D., Tubiello, F. N., van der Werf, G. R., Vuichard, N., Wang, J., Wells, K. C., Western, L. M., Wilson, C., Yang, J., Yao, Y., You, Y., and Zhu, Q.: Global nitrous oxide budget (1980–2020), Earth Syst. Sci. Data, 16, 2543–2604, https://doi.org/10.5194/essd-16-2543-2024, 2024.
Underwood, G., Fietz, S., Papadimitriou, S., Thomas, D., and Dieckmann, G.: Distribution and composition of dissolved extracellular polymeric substances (EPS) in Antarctic sea ice, Mar. Ecol. Prog. Ser., 404, 1–19, https://doi.org/10.3354/meps08557, 2010.
Underwood, G. J. C., Aslam, S. N., Michel, C., Niemi, A., Norman, L., Meiners, K. M., Laybourn-Parry, J., Paterson, H., and Thomas, D. N.: Broad-scale predictability of carbohydrates and exopolymers in Antarctic and Arctic sea ice, Proc. Natl. Acad. Sci., 110, 15734–15739, https://doi.org/10.1073/pnas.1302870110, 2013.
Venetz, J., Żygadłowska, O. M., Dotsios, N., Wallenius, A. J., van Helmond, N. A. G. M., Lenstra, W. K., Klomp, R., Slomp, C. P., Jetten, M. S. M., and Veraart, A. J.: Seasonal dynamics of the microbial methane filter in the water column of a eutrophic coastal basin, FEMS Microbiol. Ecol., 100, https://doi.org/10.1093/femsec/fiae007, 2024.
Verdugo, J., Damm, E., Snoeijs, P., Díez, B., and Farías, L.: Climate relevant trace gases (N2O and CH4) in the Eurasian Basin (Arctic Ocean), Deep Sea Res. Part Oceanogr. Res. Pap., 117, 84–94, https://doi.org/10.1016/j.dsr.2016.08.016, 2016.
Verdugo, P.: Marine Microgels, Annu. Rev. Mar. Sci., 4, 375–400, https://doi.org/10.1146/annurev-marine-120709-142759, 2012.
Weber, T., Wiseman, N. A., and Kock, A.: Global ocean methane emissions dominated by shallow coastal waters, Nat. Commun., 10, 4584, https://doi.org/10.1038/s41467-019-12541-7, 2019.
Weiss, R. F. and Price, B. A.: Nitrous oxide solubility in water and seawater, Mar. Chem., 8, 347–359, https://doi.org/10.1016/0304-4203(80)90024-9, 1980.
Wieber, C., Jensen, L. Z., Vergeynst, L., Meire, L., Juul-Pedersen, T., Finster, K., and Šantl-Temkiv, T.: Terrestrial runoff is an important source of biological ice-nucleating particles in Arctic marine systems, Atmos. Chem. Phys., 25, 3327–3346, https://doi.org/10.5194/acp-25-3327-2025, 2025.
Willis, M. D., Lannuzel, D., Else, B., Angot, H., Campbell, K., Crabeck, O., Delille, B., Hayashida, H., Lizotte, M., Loose, B., Meiners, K. M., Miller, L., Moreau, S., Nomura, D., Prytherch, J., Schmale, J., Steiner, N., Tedesco, L., and Thomas, J.: Polar oceans and sea ice in a changing climate, Elem. Sci. Anth., 11, 00056, https://doi.org/10.1525/elementa.2023.00056, 2023.
Wilson, S. T., Bange, H. W., Arévalo-Martínez, D. L., Barnes, J., Borges, A. V., Brown, I., Bullister, J. L., Burgos, M., Capelle, D. W., Casso, M., de la Paz, M., Farías, L., Fenwick, L., Ferrón, S., Garcia, G., Glockzin, M., Karl, D. M., Kock, A., Laperriere, S., Law, C. S., Manning, C. C., Marriner, A., Myllykangas, J.-P., Pohlman, J. W., Rees, A. P., Santoro, A. E., Tortell, P. D., Upstill-Goddard, R. C., Wisegarver, D. P., Zhang, G.-L., and Rehder, G.: An intercomparison of oceanic methane and nitrous oxide measurements, Biogeosciences, 15, 5891–5907, https://doi.org/10.5194/bg-15-5891-2018, 2018.
Wurl, O., Miller, L., Röttgers, R., and Vagle, S.: The distribution and fate of surface-active substances in the sea-surface microlayer and water column, Mar. Chem., 115, 1–9, https://doi.org/10.1016/j.marchem.2009.04.007, 2009.
Wurl, O., Miller, L., and Vagle, S.: Production and fate of transparent exopolymer particles in the ocean, J. Geophys. Res. Oceans, 116, 2011JC007342, https://doi.org/10.1029/2011JC007342, 2011.
Wurl, O., Stolle, C., Van Thuoc, C., The Thu, P., and Mari, X.: Biofilm-like properties of the sea surface and predicted effects on air–sea CO2 exchange, Prog. Oceanogr., 144, 15–24, https://doi.org/10.1016/j.pocean.2016.03.002, 2016.
Yang, S., Chang, B. X., Warner, M. J., Weber, T. S., Bourbonnais, A. M., Santoro, A. E., Kock, A., Sonnerup, R. E., Bullister, J. L., Wilson, S. T., and Bianchi, D.: Global reconstruction reduces the uncertainty of oceanic nitrous oxide emissions and reveals a vigorous seasonal cycle, Proc. Natl. Acad. Sci., 117, 11954–11960, https://doi.org/10.1073/pnas.1921914117, 2020.
Zhan, L., Zhang, J., Ouyang, Z., Lei, R., Xu, S., Qi, D., Gao, Z., Sun, H., Li, Y., Wu, M., Liu, J., and Chen, L.: High-resolution distribution pattern of surface water nitrous oxide along a cruise track from the Okhotsk Sea to the western Arctic Ocean, Limnol. Oceanogr., 66, https://doi.org/10.1002/lno.11604, 2021.
Ẑutić, V., Ćosović, B., Marčenko, E., Bihari, N., and Kršinić, F.: Surfactant production by marine phytoplankton, Mar. Chem., 10, 505–520, https://doi.org/10.1016/0304-4203(81)90004-9, 1981.
Short summary
In spring 2023, in the Fram Strait, we investigated the near-surface distribution of the greenhouse gases methane and nitrous oxide in open leads and under sea ice to address the lack of observations in the Arctic Ocean. The study area acted as a source for both gases, and the onset of sea ice melt affected their concentrations and emissions. Surface-active substances accumulated in the sea-surface microlayer of open leads during an algal bloom, potentially attenuating greenhouse gas emissions.
In spring 2023, in the Fram Strait, we investigated the near-surface distribution of the...
