The Spatiotemporal Dynamics of the Sources and Sinks of CO2 in the Global Coastal Ocean

Type Article
Date 2019-12
Language English
Author(s) Roobaert Alizee1, Laruelle Goulven G.1, Landschuetzer Peter2, Gruber NicolasORCID3, Chou Lei1, Regnier Pierre1
Affiliation(s) 1 : Univ Libre Bruxelles, Dept Geosci Environm & Soc, Brussels, Belgium.
2 : Max Planck Inst Meteorol, Hamburg, Germany.
3 : Swiss Fed Inst Technol, Inst Biogeochem & Pollutant Dynam, Environm Phys, Zurich, Switzerland.
Source Global Biogeochemical Cycles (0886-6236) (Amer Geophysical Union), 2019-12 , Vol. 33 , N. 12 , P. 1693-1714
DOI 10.1029/2019GB006239
WOS© Times Cited 11
Keyword(s) coastal seas, air-sea CO2 exchange, seasonality, ocean carbon cycle, continental shelves
Abstract

In contrast to the open ocean, the sources and sinks for atmospheric carbon dioxide (CO2) in the coastal seas are poorly constrained and understood. Here we address this knowledge gap by analyzing the spatial and temporal variability of the coastal air-sea flux of CO2 (FCO2) using a recent high-resolution (0.25 degrees) monthly climatology for coastal sea surface partial pressure in CO2 (pCO(2)). Coastal regions are characterized by CO2 sinks at temperate and high latitudes and by CO2 sources at low latitude and in the tropics, with annual mean CO2 flux densities comparable in magnitude and pattern to those of the adjacent open ocean with the exception of river-dominated systems. The seasonal variations in FCO2 are large, often exceeding 2 mol C m(-2) year(-1), a magnitude similar to the variations exhibited across latitudes. The majority of these seasonal variations stems from the air-sea pCO(2) difference, although changes in wind speed and sea ice cover can also be significant regionally. Globally integrated, the coastal seas act currently as a CO2 sink of -0.20 +/- 0.02 Pg C year(-1), with a more intense uptake occurring in summer because of the disproportionate influence of high-latitude shelves in the Northern Hemisphere. Combined with estimates of the carbon sinks in the open ocean and the Arctic, this gives for the global ocean, averaged over the 1998 to 2015 period an annual net CO2 uptake of -1.7 +/- 0.3 Pg C year(-1).

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