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A Synthesis of Global Coastal Ocean Greenhouse Gas Fluxes

Global Biogeochemical Cycles 2024 70 citations ? Citation count from OpenAlex, updated daily. May differ slightly from the publisher's own count. Score: 60 ? 0–100 AI score estimating relevance to the microplastics field. Papers below 30 are filtered from public browse.

Hermann W. Bange, Laure Resplandy, Raymond G. Najjar, Nicolas Gruber, Allison Hogikyan, Nicolas Gruber, Scott C. Doney, Hermann W. Bange, Hermann W. Bange, Jens Daniel Müller, Raymond G. Najjar, Hermann W. Bange, Raymond G. Najjar, Raymond G. Najjar, Hermann W. Bange, Daniele Bianchi, Daniele Bianchi, Raymond G. Najjar, Thomas Weber, Wei‐Jun Cai, Jens Daniel Müller, Scott C. Doney, Katja Fennel, Hermann W. Bange, Marion Gehlen, Judith Hauck, Fabrice Lacroix, Peter Landschützer, Corinne Le Quéré, Alizée Roobaert, Jörg Schwinger, Laurent Bopp, Sarah Berthet, Laurent Bopp, Thi Tuyet Trang Chau, Thi Tuyet Trang Chau, Minhan Dai, Nicolas Gruber, Tatiana Ilyina, Annette Kock, Marion Gehlen, Manfredi Manizza, Zouhair Lachkar, Goulven G. Laruelle, Enhui Liao, Ivan D. Lima, Cara Nissen, Christian Rödenbeck, Roland Séférian, Katsuya Toyama, Hiroyuki Tsujino, Pierre Regnier

Summary

This large-scale study measured greenhouse gas exchanges between the coastal ocean and atmosphere, finding that while coastal waters absorb carbon dioxide, they also release nitrous oxide and methane that offset much of that climate benefit. While focused on greenhouse gases rather than microplastics, the study is relevant because climate change and ocean chemistry changes affect how microplastics behave in marine environments. Warming oceans and changing chemistry could influence how microplastics break down and move through the food chain.

Study Type Environmental

Abstract The coastal ocean contributes to regulating atmospheric greenhouse gas concentrations by taking up carbon dioxide (CO 2 ) and releasing nitrous oxide (N 2 O) and methane (CH 4 ). In this second phase of the Regional Carbon Cycle Assessment and Processes (RECCAP2), we quantify global coastal ocean fluxes of CO 2 , N 2 O and CH 4 using an ensemble of global gap‐filled observation‐based products and ocean biogeochemical models. The global coastal ocean is a net sink of CO 2 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 km 2 ). We attribute most of this model‐product difference to the seasonality in sea surface CO 2 partial pressure at mid‐ and high‐latitudes, where models simulate stronger winter CO 2 uptake. The coastal ocean CO 2 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 N 2 O (+0.70 PgCO 2 ‐e year −1 in observational product and +0.54 PgCO 2 ‐e year −1 in model median) and CH 4 (+0.21 PgCO 2 ‐e year −1 in observational product), which offsets a substantial proportion of the coastal CO 2 uptake in the net radiative balance (30%–60% in CO 2 ‐equivalents), highlighting the importance of considering the three greenhouse gases when examining the influence of the coastal ocean on climate.

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