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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >From Land to the Ocean: The Interplay Between Allochthonous and Autochthonous Contribution to Particles in Nepheloid Layers of the Cariaco Basin, Venezuela
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From Land to the Ocean: The Interplay Between Allochthonous and Autochthonous Contribution to Particles in Nepheloid Layers of the Cariaco Basin, Venezuela

机译：从陆地到海洋：委内瑞拉Cariaco盆地尼触林层中的术语和自身加载贡献之间的相互作用

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Lithogenic sediment input to the Cariaco Basin on the eastern Venezuelan shelf is controlled by small mountainous rivers (SMRs). The Cariaco Basin is also an area of high phytoplankton productivity as a result of strong Trade Wind-driven coastal upwelling. Characterizing the sources that supply particulate organic carbon (POC) to the deep Cariaco Basin is important for interpreting the paleoclimate record stored in its sediments. We measured suspended POC in the four main rivers draining into the Caraiaco Basin, the Tuy, Unare, Neveri, and Manzanares, between September 2008 and September 2009 and conducted basin-wide oceanographic cruises in September 2008 (rainy season) and March 2009 (upwelling season). Riverine concentrations of dissolved organic carbon (DOC) and POC in the four rivers were comparable to observations made in similar tropical SMR systems (POC was between 0.3-2 mg C l~(-1); DOC was between 100-300 μM). Within the basin, the geochemical composition of surface particles and bottom nepheloid layers (BNLs) changed with season. During the rainy season, the isotopic composition of both surface particles and BNL was characteristic of continentally derived material (δ~(13)C_(org), approximately -30 to -26‰), while during upwelling, the composition shifted to values more typical of marine sources (δ~(13)C_(org), approximately -24 to -20‰). SMRs represent an important component of the global carbon budget, which are often overlooked in ocean carbon budgets and also in paleoclimate studies of coastal environments.
机译：东委内瑞拉架上的Cariaco盆地的型型沉积物由小山区河流（SMR）控制。 Cariaco Basin也是由于强大的贸易风力驱动的沿海上升升起而高浮游植物生产率的领域。将颗粒化有机碳（POC）提供给深层CARIACO盆地的来源对于解释储存在其沉积物中的古平衡记录非常重要。我们在2008年9月和2009年9月至9月在2008年9月至9月期间，在2008年9月和2009年9月（雨季）和2009年3月（2009年3月（上升月经）和2009年3月（上升月经）和2009年3月（上升期间）进行了盆地，unots季节）。四条河流中河流浓度的溶解有机碳（DOC）和POC与在类似的热带SMR系统中的观察结果相当（POC为0.3-2mg C L〜（-1）; DOC在100-300μm之间）。在盆地内，表面颗粒和底部肾蜂鸣层（BNL）的地球化学组成随季节而变化。在雨季期间，两种表面颗粒和BN1的同位素组成是常衍生材料的特征（δ〜（13）C_（ORG），约-30至-26°+，而在升值期间，该组合物将更多地移位为更多典型的海洋来源（δ〜（13）c_（org），约-24至-20‰）。 SMRS代表全球碳预算的重要组成部分，这些组成部分往往忽视了海洋碳预算，也经常忽视沿海环境的古古典研究。

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