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.; Fennel, K.; Gehlen, M.; Hauck, J.; Lacroix, F.; Landschützer, P.; Le Quéré, 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, E.; Lima, I. D.; Nissen, C.; Rödenbeck, C.; Séférian, R.; Toyama, K.; Tsujino, H.; Regnier, P.

doi:10.1029/2023gb007803

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A Synthesis of Global Coastal Ocean Greenhouse Gas Fluxes

2024
By Resplandy, L. ; Hogikyan, A. ; Müller, J. D. ; ...
Source: Global Biogeochemical Cycles, 38(1)

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Journal Title:

Global Biogeochemical Cycles
Personal Author:

Resplandy, L. ; Hogikyan, A. ; Müller, J. D. ; Najjar, R. G. ; Bange, H. W. ; ... More +

Resplandy, L. ; Hogikyan, A. ; Müller, J. D. ; Najjar, R. G. ; Bange, H. W. ; Bianchi, D. ; Weber, T. ; Cai, W.‐J. ; Doney, S. C. ; Fennel, K. ; Gehlen, M. ; Hauck, J. ; Lacroix, F. ; Landschützer, P. ; Le Quéré, 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, E. ; Lima, I. D. ; Nissen, C. ; Rödenbeck, C. ; Séférian, R. ; Toyama, K. ; Tsujino, H. ; Regnier, P. Less -
NOAA Program & Office:

NCEI (National Centers for Environmental Information) ; NESDIS (National Environmental Satellite, Data, and Information Service) ; OAR (Oceanic and Atmospheric Research)

NCEI (National Centers for Environmental Information) ; NESDIS (National Environmental Satellite, Data, and Information Service) ; OAR (Oceanic and Atmospheric Research) Less -
Description:

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.
Keywords:

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Atmospheric Science Environmental Chemistry General Environmental Science Global And Planetary Change
Source:

Global Biogeochemical Cycles, 38(1)
DOI:

https://doi.org/10.1029/2023gb007803
ISSN:

0886-6236;1944-9224;
Format:

PDF
Publisher:

American Geophysical Union (AGU)
Document Type:

Journal Article
Funding:

Grant no. NA21OAR4310119
License:

https://creativecommons.org/licenses/by-nc/4.0/
Rights Information:

CC BY-NC
Compliance:

Library
Main Document Checksum:

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urn:sha-512:96f563a89ab7b7ea0e842011e61a083584772a886a5dcd480e6dd92551c957df6d42ba31a46e1ed8ce076b9ebb920fbe97d81819eb8d7ce8d278820021763c1d
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https://repository.library.noaa.gov/view/noaa/64360/noaa_64360_DS1.pdf
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