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Euphotic zone nitrification in the NE subarctic Pacific: Implications for measurements of new production

机译：东北亚太平洋太平洋的富营养区硝化作用：对新产量测量的意义

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摘要

Ammonium (NH_4~+) oxidation rates, nitrate (NO_3~-) uptake rates and dissolved nutrient concentrations were measured throughout the euphotic zone along the Line P oceanographic transect in the NE subarctic Pacific, on three cruises (winter, spring and late-summer) in 2009. NH_4~+ oxidation was found to proceed throughout the euphotic zone and rates ranged from undetectable to 97 nmol L~(-1) d~(-1). Evidence was found to suggest that both light and NH_4~+ concentrations played a role in regulating NH_4~+ oxidation rates, with rates increasing as light decreased and NH_4~+ concentrations increased. The observation that NH_4~+ oxidation was a ubiquitous process throughout the euphotic zone demonstrates that not all NO_3~- present in this region of the water column should be considered new nitrogen, and has important implications for estimates of new production in the NE subarctic Pacific. Depth-integrated NO_3~- uptake rates ranged from 0.65 to 6.0 mmol m~(-2) d~(-1) and we found that euphotic zone NH_4~+ oxidation could have supported between 3 and 100% of the phytoplankton NO_3~- demands along Line P. Taking potential euphotic zone NO_3~- regeneration into account resulted in new production estimates being reduced by an average of -50%. During spring and late-summer, the degree by which new production was reduced, when euphotic zone NO_3~- regeneration was taken into consideration, was tightly anti-correlated to total NO_3~- uptake rates. This indicates that the implications of euphotic zone nitrification for estimates of new production are greatest in the less productive regions of the oceans.
机译：沿东北亚太平洋太平洋P线海洋样带的整个富营养区，在三个巡游中（冬季，春季和夏末）测量了铵（NH_4〜+）的氧化速率，硝酸盐（NO_3〜-）的吸收速率和溶解的养分浓度）在2009年。发现NH_4〜+氧化在整个常温区进行，速率范围从不可检测到97 nmol L〜（-1）d〜（-1）。有证据表明，光和NH_4〜+浓度均在调节NH_4〜+氧化速率中起作用，速率随光的降低和NH_4〜+浓度的升高而增加。 NH_4〜+氧化是整个富营养区普遍存在的过程的观察结果表明，并非所有存在于水柱区域的NO_3〜-都应被视为新氮，并且对东北亚太平洋太平洋新产量的估算具有重要意义。 。深度整合的NO_3〜-吸收速率在0.65至6.0 mmol m〜（-2）d〜（-1）之间，我们发现富营养区NH_4〜+氧化可支持3％至100％的浮游植物NO_3〜-。沿P线的需求。考虑到潜在的富营养区NO_3〜-再生，导致新的产量估算平均降低了-50％。在春季和夏末，当考虑到富营养区NO_3〜-的再生时，新产量减少的程度与总NO_3〜-的吸收率紧密相关。这表明，在低产的海洋地区，富营养区硝化作用对估计新产量的影响最大。

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  • 来源
    《Marine Chemistry》 |2013年第20期|113-123|共11页
  • 作者

    Damian S. Grundle; S. Kim Juniper; Karina E. Giesbrecht;

  • 作者单位

    Department of Biology, P.O. Box 3020, Station CSC, University of Victoria, BC V8W 3N5, Canada;

    Department of Biology, P.O. Box 3020, Station CSC, University of Victoria, BC V8W 3N5, Canada,School of Earth and Ocean Sciences, P.O. Box 3065, Station CSC, University of Victoria, Victoria, BC V8W 3V6, Canada;

    School of Earth and Ocean Sciences, P.O. Box 3065, Station CSC, University of Victoria, Victoria, BC V8W 3V6, Canada;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Nitrification; Ammonium oxidation; New production; Nitrate uptake; NE subarctic Pacific; Line P;

    机译：硝化作用铵氧化;新产品;硝酸盐吸收;东北亚太平洋P线;

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