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首页> 外文期刊>Continental Shelf Research: A Companion Journal to Deep-Sea Research and Progress in Oceanography >Benthic flux of biogenic elements on the Southeastern US continental shelf: influence of pore water advective transport and benthic microalgae
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Benthic flux of biogenic elements on the Southeastern US continental shelf: influence of pore water advective transport and benthic microalgae

机译：美国东南大陆架生物成因底栖通量：孔隙水对流输运和底栖微藻的影响

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摘要

In situ, paired light and dark benthic flux chamber incubations were used to estimate the exchange of nutrients, oxygen and inorganic carbon across the sediment - water interface of the South Atlantic Eight (SAB) continental shelf. The results indicate that physically forced non-diffusive pore water transport and benthic primary production (EPP) by sea floor microalgae exert a major influence on benthic exchange rates on the mid- and outer-continental shelf (depths of 14-40 m). Light fluxes to the sea floor and sediment photosynthetic pigment distributions determined on two, widely spaced cross-shelf transects suggest that BPP may occur over 84% of the SAB continental shelf area. Microalgal gross BPP rates at all study sites averaged 400 +/- 260 mg C m(-2) d(-1) between May and September 1996 while water column primary productivity averaged 682 +/- 176 mg C m(-2) d(-1), implying a total primary productivity for this region of approximately 1100 mg C m(-2) d(-1) (1.6 times the water column productivity alone). The results are also consistent with the advective transport of pore waters. Benthic flux chambers appear to retard this exchange, affecting the accuracy of derived net fluxes. Given our inability to relate pore water gradients to fluxes in non-diffusive regimes and to mimic natural advective transport in intact core incubations, traditional techniques such as pore water gradient diffusion calculations or shipboard core incubations also may not provide accurate flux estimates. Because of these limitations, fundamental questions remain concerning the processes that control nutrient inventories in pore waters and the magnitude of the net benthic flux of nutrients on the sandy SAB shelf. (C) 1999 Elsevier Science Ltd. All rights reserved. [References: 28]
机译：在原地，使用成对的底栖和底栖底栖通量孵化室来估算整个南大西洋八（SAB）大陆架沉积物-水界面之间的养分，氧气和无机碳的交换。结果表明，海底微藻通过物理强迫的非扩散性孔隙水运输和底栖初级生产（EPP）对中，外陆架（深度14-40 m）底栖生物交换率产生了重大影响。在两个相距较远的横架横断面上确定的流向海底的光通量和沉积物光合色素分布表明，BPP可能发生在SAB大陆架面积的84％以上。在1996年5月至9月之间，所有研究地点的微藻总BPP率平均为400 +/- 260 mg C m（-2）d（-1），而水柱的初级生产力平均为68​​2 +/- 176 mg C m（-2）d （-1），这意味着该区域的总初级生产力约为1100 mg C m（-2）d（-1）（仅是水柱生产率的1.6倍）。结果也与孔隙水的对流输送一致。底栖通量室似乎阻碍了这种交换，影响了衍生净通量的准确性。鉴于我们无法在非扩散状态下将孔隙水梯度与通量联系起来，并且无法在完整的岩心培养中模拟自然对流传输，因此传统技术（例如孔隙水梯度扩散计算或船上岩心培养）也可能无法提供准确的通量估算值。由于这些限制，仍然存在一些基本问题，这些问题涉及控制孔隙水中养分清单的过程以及沙质SAB架子上养分净底栖通量的大小。 （C）1999 Elsevier ScienceLtd。保留所有权利。 [参考：28]

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