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首页> 外文期刊>Estuarine Coastal and Shelf Science >Input of organic carbon as determinant of nutrient fluxes, light climate and productivity in the Ob and Yenisey estuaries
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Input of organic carbon as determinant of nutrient fluxes, light climate and productivity in the Ob and Yenisey estuaries

机译：Ob和Yenisey河口输入有机碳作为养分通量，气候和生产力的决定因素

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摘要

Spectral light attenuation profiles and concentrations of total and dissolved carbon (C), nutrients and chlorophyll a (Chla) were studied along transects running from the river mouth to the Kara Sea during late summer 2003 for the Yenisey and fall 2005 for the Ob estuaries. Earth Observation data were used to generate composite images of water color and Chla distribution over the estuaries and the Kara Sea to reveal the spatial impact of the river efflux in terms of optical properties.rnHigh levels of total nitrogen (N), total phosphorus (P), silicate (Si) and iron (Fe), but low levels of inorganic N and P and Chla were found in the estuaries. More than 90 % of total organic C was in dissolved form (DOC). The high concentrations of DOC, mostly terrigenous, humic compounds, gave extremely high attenuation coefficients for both visible and ultraviolet light. For UV-B, Z_(10%) (the depth at which 10% of surface light remains) was <10 cm, while Z_(10%) for visible light (PAR) generally ranged between 1 and 3 m for both transects. The light attenuation rapidly decreases when the freshwater is mixed with the coastal water outside off the coast. This leads to a strong light limitation and low productivity in the inner estuaries, while the high load of N and P associated with DOC eventually could promote primary production in the Kara Sea and further upstream the coastal current in the Arctic Ocean as the organic matter becomes diluted and photooxidized. On the other hand, the high inputs of colored dissolved organic matter (CDOM) provide an efficient screening of potential harmful UV-radiation over vast areas of the Arctic Ocean. A rising trend of riverine efflux to the Arctic seas is observed, and further increases in freshwater runoff as well as eventual permafrost thawing, will accentuate the freshwater impact in the estuaries and the Kara Sea.
机译：在2003年夏末的叶尼西和2005年秋季的Ob口沿从河口到卡拉海的横断面研究了光谱光衰减曲线以及总和溶解碳（C），养分和叶绿素a（Chla）的浓度。地球观测数据用于生成河口和卡拉海的水彩和Chla分布的合成图像，以揭示河流外排在光学特性方面的空间影响。高总氮（N），总磷（P ），硅酸盐（Si）和铁（Fe），但在河口中发现了少量的无机N和P和Chla。总有机碳的90％以上为溶解形式（DOC）。高浓度的DOC（主要是源于腐殖质的化合物）对可见光和紫外光均具有极高的衰减系数。对于UV-B，两个断面的Z_（10％）（保留10％的表面光的深度）<10 cm，而可见光（PAR）的Z_（10％）通常在1-3 m之间。当淡水与海岸外的沿海水混合时，光衰减迅速降低。这导致了内河口的强光限制和低生产力，而与DOC相关的氮和磷的高负荷最终可能促进了卡拉海以及北冰洋随着有机质的转化而向上游流动的上游生产。稀释并光氧化。另一方面，大量投入的有色溶解有机物（CDOM）可有效筛查北冰洋广大地区的潜在有害UV辐射。观察到河流流向北极海域的趋势呈上升趋势，淡水径流的进一步增加以及最终的永久冻土融化将加剧淡水对河口和卡拉海的影响。

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  • 来源
    《Estuarine Coastal and Shelf Science》 |2010年第1期|P.53-62|共10页
  • 作者

    Dag O. Hessen; JoLynn Carroll; Berit Kjeldstad; Anton A. Korosov; Lasse H. Pettersson; Dmitry Pozdnyakov; Kai Sorensen;

  • 作者单位

    University of Oslo, Department of Biology, CEES, P.O.Box 1066 Blindem, 0316 Oslo, Norway;

    Akvaplan-niva, Polar Environmental Centre, 9296 Tromse, Norway;

    Norwegian University of Science and Technology, Department of Physics, 7491 Trondheim, Norway;

    Nansen International Environmental and Remote Sensing Centre, 14 Line V.O. 7, 199034, St. Petersburg, Russia Nansen Environmental and Remote Sensing Center, Thormohlensgate 47, N-5006, Bergen, Norway;

    Nansen Environmental and Remote Sensing Center, Thormohlensgate 47, N-5006, Bergen, Norway;

    Nansen International Environmental and Remote Sensing Centre, 14 Line V.O. 7, 199034, St. Petersburg, Russia Nansen Environmental and Remote Sensing Center, Thormohlensgate 47, N-5006, Bergen, Norway;

    Norwegian Institute for Water Research (NIVA), Gaustadalleen 21, 0349 Oslo, Norway;

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  • 正文语种 eng
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  • 关键词

    arctic rivers; DOC; nutrients; irradiation; kara sea; production;

    机译：北极河流;DOC;营养素辐照卡拉海生产;

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