Continental shelves as a variable but increasing global sink for atmospheric carbon dioxide.

Abstract:

:It has been speculated that the partial pressure of carbon dioxide (pCO2) in shelf waters may lag the rise in atmospheric CO2. Here, we show that this is the case across many shelf regions, implying a tendency for enhanced shelf uptake of atmospheric CO2. This result is based on analysis of long-term trends in the air-sea pCO2 gradient (ΔpCO2) using a global surface ocean pCO2 database spanning a period of up to 35 years. Using wintertime data only, we find that ΔpCO2 increased in 653 of the 825 0.5° cells for which a trend could be calculated, with 325 of these cells showing a significant increase in excess of +0.5 μatm yr-1 (p < 0.05). Although noisier, the deseasonalized annual data suggest similar results. If this were a global trend, it would support the idea that shelves might have switched from a source to a sink of CO2 during the last century.

journal_name

Nat Commun

journal_title

Nature communications

authors

Laruelle GG,Cai WJ,Hu X,Gruber N,Mackenzie FT,Regnier P

doi

10.1038/s41467-017-02738-z

subject

Has Abstract

pub_date

2018-01-31 00:00:00

pages

454

issue

1

issn

2041-1723

pii

10.1038/s41467-017-02738-z

journal_volume

9

pub_type

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