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Nutrients

机译:营养素

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摘要

To quantify the balance between new production and vertical nitrogen export of sinking particles, we measured nitrate uptake, net nitrate drawdown, ΔO_2/Ar-based net community production, sediment trap flux, and ~(234)Th export at a coastal site near Palmer Station, Antarctica, during the phytoplankton growing season from October 2012 to March 2013. We also measured nitrate uptake and ~(234)Th export throughout the northern western Antarctic Peninsula (WAP) region on a cruise in January 2013. We used a nonsteady state ~(234)Th equation with temporally varying up-welling rates and an irradiance-based phytoplankton production model to correct our export and new production estimates in the complex coastal site near Palmer Station. Results unequivocally showed that nitrate uptake and net community production were significantly greater than the sinking particle export on region-wide spatial scales and season-long temporal scales. At our coastal site, new production (105 ± 17.4 mg N m~(-2) d~(-1), mean ± standard error) was 5.3 times greater than vertical nitrogen export (20.4 ± 2.4 mg N m~(-2) d~(-1)). On the January cruise in the northern WAP, new production (47.9 ± 14.4 mg N m~(-2) d~(-1)) was 2.4 times greater than export (19.9 ± 1.4mg N m~(-2) d~(-1)). Much of this imbalance can be attributed to diffusive losses of particulate nitrogen from the surface ocean due to diapycnal mixing, indicative of a "leaky" WAP ecosystem. If these diffusive losses are common in other systems where new production exceeds export, it may be necessary to revise current estimates of the ocean's biological pump.
机译:为了量化下沉颗粒的新产量和垂直氮出口之间的平衡,我们测量了帕尔默附近沿海地区的硝酸盐吸收,净硝酸盐沉降,基于ΔO_2/ Ar的净群落产量,沉积物陷阱通量和〜(234)Th出口在2012年10月至2013年3月的浮游植物生长季节期间,南极站。我们还在2013年1月的一次航行中测量了整个南极半岛北部(WAP)地区的硝酸盐吸收和〜(234)Th出口。我们使用了非稳态〜(234)Th方程具有随时间变化的上升速率和基于辐照度的浮游植物生产模型,以纠正Palmer站附近复杂沿海地区的出口和新生产估算。结果明确表明,在整个区域的空间尺度和整个季节的时间尺度上,硝酸盐的吸收和净群落产量均显着大于沉降颗粒的出口。在我们的沿海地区,新产量(105±17.4 mg N m〜(-2)d〜(-1),均值±标准误差)是垂直氮输出量(20.4±2.4 mg N m〜(-2)的5.3倍)d〜(-1))。在北部WAP一月份的航行中,新产量(47.9±14.4 mg N m〜(-2)d〜(-1))是出口量(19.9±1.4mg N m〜(-2)d〜)的2.4倍。 (-1))。这种不平衡的大部分可以归因于由于二面向混合造成的表层海洋氮颗粒的扩散损失,这表明“泄漏”的WAP生态系统。如果这些扩散性损失在其他生产超过出口的系统中很常见,则可能有必要修改当前对海洋生物泵的估算。

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  • 来源
    《Oceanographic Literature Review》 |2016年第2期|278-280|共3页
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