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Water column denitrification rates in the oxygen minimum layer of the Pacific Ocean along 32°S

机译:太平洋沿32°S氧气最低层的水柱反硝化速率

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To date, estimates of water column denitrification rates in global- and basin-scale nitrogen budgets do not include any values obtained in the open ocean outside the oxygen minimum zones (OMZs). The high-quality, 32°S Pacific repeat hydrographic surveys conducted in 1992, 2003, and 2010 offer an opportunity to estimate denitrification rates on basin scales in the open ocean away from the Eastern Tropical Pacific (ETP) oxygen minimum zones. Here, extended optimum multiparameter analysis and N* are used to estimate water column denitrification (ΔNdeni) in the oxygen minimum layer (OML; 1100-2000 dbar). Water column denitrification rates for 2003 and 2010 are estimated from the regression analysis using ΔNdeni and transit time distribution ages based on CFC12. Estimated mean denitrification rates in the OML at 32°S range from 3.1 to 7.5 μmol N m~(-3) yr ~(-1) (=2.6-6.8 mmol N m~(-2) yr~(-1) with a thickness of 900 m). The OML denitrification rates are 2-3 orders of magnitudes lower than those estimated in the OMZs of ETP. However, their significance to Pacific nitrogen budget needs to be investigated in the future. Although uncertainties remain, our results may ultimately contribute to an improved understanding of marine nitrogen cycles. Key Points We estimated water column denitrification in the P06 (~32{degree sign}S) OML.We showed spatial variation of the water column denitrification rates.The OML denitrification may contribute to the Pacific nitrogen budget.
机译:迄今为止,在全球和流域规模的氮预算中,水柱反硝化率的估计值不包括在最低氧区域(OMZ)之外的公海中获得的任何值。在1992年,2003年和2010年进行的高质量的32°S太平洋重复水文调查提供了一个机会,可以估算远离东部热带太平洋(ETP)氧气最低限度区域的公海流域尺度上的反硝化率。在这里,扩展的最佳多参数分析和N *用于估计最小氧气层(OML; 1100-2000 dbar)中的水柱反硝化(ΔNdeni)。使用ΔNdeni和基于CFC12的运输时间分布年龄,通过回归分析估算出2003年和2010年的水柱反硝化率。 OML在32°S时的估计平均反硝化速率为3.1至7.5μmolN m〜(-3)yr〜(-1)(= 2.6-6.8 mmol N m〜(-2)yr〜(-1)厚度为900 m)。 OML的反硝化率比ETP的OMZ估计的反硝化率低2-3个数量级。但是,它们对太平洋氮预算的重要性需要在未来进行研究。尽管不确定性仍然存在,但我们的结果可能最终有助于更好地了解海洋氮循环。要点我们估计了P06(〜32 {degree sign} S)OML中的水柱反硝化。我们显示了水柱反硝化率的空间变化。OML的反硝化可能有助于太平洋氮预算。

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