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首页> 外文期刊>Geochemistry, geophysics, geosystems >Utilizing Po-210 deficit to constrain particle dynamics in mesopelagic water, western South China Sea
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Utilizing Po-210 deficit to constrain particle dynamics in mesopelagic water, western South China Sea

机译：利用PO-210赤字限制南海西南部水中水中的粒子动态

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The Po-210-Pb-210 pair is increasingly used as a proxy of quantifying organic carbon export from the euphotic zone. However, disequilibria between Po-210 and Pb-210 in mesopelagic water have been poorly studied. Here we present unusual deficiencies of Po-210 with respect to Pb-210 in mesopelagic water (200-1000 m) in the South China Sea (SCS). The total particulate matter (TPM) increased by up to 32% in the mesopelagic layer comparing with the euphotic zone. The total Po-210/Pb-210 ratio varied from 0.41 to 0.98 with an average of 0.72 +/- 0.19, showing an enhanced removal of Po-210 in mesopelagic water. On average, particulate Po-210 and Pb-210 increased by 23% and 32% at the slope stations, respectively. These results indicated that the Po-210 deficits result from lateral transport, probably via benthic nepheloid layer. Based on the deficiency of Po-210, the residence times of particulate Po-210 were estimated to range from 0.11 to 0.25 year (avg. 0.17 +/- 0.07 year), allowing resuspended sediment to disperse over a long range. The export fluxes of Po-210 varied from 68 to 121 dpm m(-2) d(-1) with an average of 96 +/- 27 dpm m(-2) d(-1), which was 6 times that out of the euphotic zone. Using the Po-210 deficits, the export fluxes of TPM out of the mesopelagic layer were quantified to vary from 4.19 to 10.20 g m(-2) d(-1), revealing a large amount of particles from the shelf to the SCS basin. This study suggests that Po-210-Pb-210 could be an effective tracer of tracking particle cycling in mesopelagic water.
机译：PO-210-PB-210对越来越多地用作量化来自Euphotic区的有机碳的代理。然而，研究了叶片210和介乎中间瓣水中的PB-210之间的不平衡已经研究。在这里，我们在南海（SCS）中，在南海（200-1000米）中的PB-210呈现出不寻常的PO-210缺陷。与Euphotic区相比，在缺口层中，总颗粒物质（TPM）在介孔层中增加了32％。总PO-210 / PB-210比率从0.41到0.98变化，平均值为0.72 +/- 0.19，显示在中段水中的PO-210的增强去除。平均而言，分别在斜坡站上的颗粒PO-210和PB-210分别增加了23％和32％。这些结果表明，PO-210缺陷由横向运输产生，可能通过底栖肾盂层。基于PO-210的缺陷，颗粒PO-210的停留时间估计为0.11至0.25年（AVG。0.17 +/- 0.07年），允许重悬的沉积物分散在很长的范围内。 PO-210的导出通量从68到121 dpm m（-2）d（-1）不同（-1），平均为96 +/- 27dpm m（-2）d（-1），这是一个6倍euphotic区。使用PO-210缺陷，量化切口的输出通量量为0.19至10.20g m（-2）d（-1），从架子上显示出大量颗粒到SCS盆地。该研究表明，PO-210-PB-210可以是追踪颗粒循环循环水中的有效示踪剂。

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    Ma Haoyang; Yang Weifeng; Zhang Lihao; Zhang Run; Chen Min; Qiu Yusheng; Zheng Minfang;

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    Xiamen Univ State Key Lab Marine Environm Sci Xiamen Peoples R China;

    Xiamen Univ State Key Lab Marine Environm Sci Xiamen Peoples R China;

    Guilin Univ Technol Coll Environm Sci &

    Engn Guilin Peoples R China;

    Xiamen Univ State Key Lab Marine Environm Sci Xiamen Peoples R China;

    Xiamen Univ State Key Lab Marine Environm Sci Xiamen Peoples R China;

    Xiamen Univ State Key Lab Marine Environm Sci Xiamen Peoples R China;

    Xiamen Univ State Key Lab Marine Environm Sci Xiamen Peoples R China;

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  • 正文语种 eng
  • 中图分类 地球物理学;
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