What causes the inverse relationship between primary production and export efficiency in the Southern Ocean?
What causes the inverse relationship between primary production and export efficiency in the Southern Ocean?
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DOI：
10.1002/2016gl068480
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发表时间：
2016-05
影响因子：
5.2
通讯作者：
Frédéric A. C. Le Moigne;S. Henson;Emma Cavan;C. Georges;K. Pabortsava;E. Achterberg;E. Ceballos-Romero;Mike Zubkov;R. Sanders
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文献类型：
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作者：
Frédéric A. C. Le Moigne;S. Henson;Emma Cavan;C. Georges;K. Pabortsava;E. Achterberg;E. Ceballos-Romero;Mike Zubkov;R. Sanders
海洋有助于调节大气二氧化碳水平，部分是通过从表层输出的初级生产部分(PP)的变化(即e比)。南大洋研究发现，与全球尺度的分析相反，e比率和PP之间存在着相反的关系。这种关系仍未得到解释，潜在的假设是(I)高PP区溶解有机碳(DOC)的大量输出，(Ii)高PP区地表微生物的强烈循环，和/或(Iii)放牧介导的与PP成反比的输出。我们发现，DOC的出口对设定负的e/PP关系的影响有限。然而，我们观察到，在低PP和高e比率的地点，浮游动物介导的输出量很大，而表层微生物丰度较低，这表明两者都是南大洋e比率大小的重要驱动因素。
The ocean contributes to regulating atmospheric CO2 levels, partly via variability in the fraction of primary production (PP) which is exported out of the surface layer (i.e., the e ratio). Southern Ocean studies have found that contrary to global‐scale analyses, an inverse relationship exists between e ratio and PP. This relationship remains unexplained, with potential hypotheses being (i) large export of dissolved organic carbon (DOC) in high PP areas, (ii) strong surface microbial recycling in high PP regions, and/or (iii) grazing‐mediated export that varies inversely with PP. We find that the export of DOC has a limited influence in setting the negative e ratio/PP relationship. However, we observed that at sites with low PP and high e ratios, zooplankton‐mediated export is large and surface microbial abundance low suggesting that both are important drivers of the magnitude of the e ratio in the Southern Ocean.