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首页> 外文期刊>Geophysical Research Letters >Sinking organic matter spreads the nitrogen isotope signal of pelagic denitrification in the North Pacific
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Sinking organic matter spreads the nitrogen isotope signal of pelagic denitrification in the North Pacific

机译：下沉的有机物传播北太平洋中上层反硝化的氮同位素信号

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摘要

Culture studies of denitrifying bacteria predict that denitrification will generate equivalent gradients in the δ~(15)N and δ~(18)O of deep ocean nitrate. A depth profile of nitrate isotopes from the Hawaii Ocean Time-series Station ALOHA shows less of an increase in δ~(18)O than in δ~(15)N as one ascends from abyssal waters into the denitrification_impacted mid-depth waters. A box model of the ocean nitrate N and O isotopes indicates that this is the effect of the low latitude nitrate assimilation/regeneration cycle: organic N sinking out of the surface spreads the high-δ~(15) N signal of pelagic denitrification into waters well below and beyond the suboxic zone, whereas the nitrate δ~(18)O signal of denitrification can only be transmitted by circulation in the interior.
机译：反硝化细菌的培养研究预测，反硝化作用将在深海硝酸盐的δ〜（15）N和δ〜（18）O中产生等效的梯度。夏威夷海洋时间序列站ALOHA的硝酸盐同位素深度剖面显示，δ〜（18）O的增加幅度小于δ〜（15）N的增加幅度，因为一个人从深渊水上升到受反硝化作用影响的中深度水域。海洋硝酸盐氮和氧同位素的箱形模型表明这是低纬度硝酸盐同化/再生循环的影响：从表面下沉的有机氮将上层反硝化的高δ〜（15）N信号传播到水中硝酸盐δ〜（18）O的反硝化信号只能通过内部循环传递。

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