Laruelle Goulven G, Cai Wei-Jun, Hu Xinping, Gruber Nicolas, Mackenzie Fred T, Regnier Pierre
Department of Geoscience, Environment & Society, Université Libre de Bruxelles, Brussels, 1050, Belgium.
School of Marine Science and Policy, University of Delaware, Newark, DE, 19716, USA.
Nat Commun. 2018 Jan 31;9(1):454. doi: 10.1038/s41467-017-02738-z.
It has been speculated that the partial pressure of carbon dioxide (pCO) in shelf waters may lag the rise in atmospheric CO. Here, we show that this is the case across many shelf regions, implying a tendency for enhanced shelf uptake of atmospheric CO. This result is based on analysis of long-term trends in the air-sea pCO gradient (ΔpCO) using a global surface ocean pCO database spanning a period of up to 35 years. Using wintertime data only, we find that ΔpCO 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 (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 CO during the last century.
据推测，陆架水体中二氧化碳的分压（pCO）可能滞后于大气中二氧化碳浓度的上升。在此，我们表明在许多陆架区域确实如此，这意味着大气中二氧化碳被陆架吸收的趋势增强。这一结果是基于对海气pCO梯度（ΔpCO）长期趋势的分析得出的，该分析使用了一个跨度长达35年的全球表层海洋pCO数据库。仅使用冬季数据，我们发现在可计算趋势的825个0.5°网格单元中的653个中，ΔpCO有所增加，其中325个网格单元显示出超过+0.5 μatm yr的显著增加（p < 0.05）。尽管去季节化的年度数据噪声较大，但也表明了类似的结果。如果这是一个全球趋势，那么它将支持这样一种观点，即在上个世纪，陆架可能已从二氧化碳的源转变为汇。
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