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A synthesis of global coastal ocean greenhouse gas fluxes Resplandy, L.; Hogikyan, A.; Müller, J.D.; Najjar, R.G.; Bange, H.W.; Bianchi, D.; Weber, T.; Cai, W.-J.; Doney, S.C.; Kennel, K.; Gehlen, M.; Hauck, J.; Lacroix, F.; Landschützer, P.; Le Quere, C.; Roobaert, A.; Schwinger, J.; Berthet, S.; Bopp, L.; Chau, T.T.T.; Dai, M.; Gruber, N.; Ilyina, T.; Kock, A.; Manizza, M.; Lachkar, Z.; Laruelle, G.G.; Liao, R.; Lima, I.D.; Nissen, C.; Rödenbeck, C.; Séférian, R.; Toyama, K.; Tsujino, H.; Regnier, P. (2024). A synthesis of global coastal ocean greenhouse gas fluxes. Global Biogeochem. Cycles 38(1): e2023GB007803. https://dx.doi.org/10.1029/2023gb007803 In: Global Biogeochemical Cycles. American Geophysical Union: Washington, DC. ISSN 0886-6236; e-ISSN 1944-9224

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Beschikbaar in	Auteurs
VLIZ: Open access 395281 [ download pdf ]

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Auteurs		Top
Resplandy, L. Hogikyan, A. Müller, J.D. Najjar, R.G. Bange, H.W. Bianchi, D. Weber, T. Cai, W.-J. Doney, S.C. Kennel, K. Gehlen, M. Hauck, J.	Lacroix, F. Landschützer, P. Le Quere, C. Roobaert, A. Schwinger, J. Berthet, S. Bopp, L. Chau, T.T.T. Dai, M. Gruber, N. Ilyina, T. Kock, A.	Manizza, M. Lachkar, Z. Laruelle, G.G. Liao, R. Lima, I.D. Nissen, C. Rödenbeck, C. Séférian, R. Toyama, K. Tsujino, H. Regnier, P.

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Abstract

The coastal ocean contributes to regulating atmospheric greenhouse gas concentrations by taking up carbon dioxide (CO2) and releasing nitrous oxide (N2O) and methane (CH4). In this second phase of the Regional Carbon Cycle Assessment and Processes (RECCAP2), we quantify global coastal ocean fluxes of CO2, N2O and CH4 using an ensemble of global gap-filled observation-based products and ocean biogeochemical models. The global coastal ocean is a net sink of CO2 in both observational products and models, but the magnitude of the median net global coastal uptake is ∼60% larger in models (−0.72 vs. −0.44 PgC year−1, 1998–2018, coastal ocean extending to 300 km offshore or 1,000 m isobath with area of 77 million km2). We attribute most of this model-product difference to the seasonality in sea surface CO2 partial pressure at mid- and high-latitudes, where models simulate stronger winter CO2 uptake. The coastal ocean CO2 sink has increased in the past decades but the available time-resolving observation-based products and models show large discrepancies in the magnitude of this increase. The global coastal ocean is a major source of N2O (+0.70 PgCO2-e year−1 in observational product and +0.54 PgCO2-e year−1 in model median) and CH4 (+0.21 PgCO2-e year−1 in observational product), which offsets a substantial proportion of the coastal CO2 uptake in the net radiative balance (30%–60% in CO2-equivalents), highlighting the importance of considering the three greenhouse gases when examining the influence of the coastal ocean on climate.

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