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首页> 外文期刊>Palaeogeography, Palaeoclimatology, Palaeoecology: An International Journal for the Geo-Sciences >Simulations of ecosystem response during the sapropel S1 deposition event
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Simulations of ecosystem response during the sapropel S1 deposition event

机译：腐烂S1沉积过程中生态系统响应的模拟

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A one-dimensional ecosystem numerical model is used to simulate the ecosystem changes that could have occurred in the open ocean areas of the Eastern Mediterranean Sea during the Climatic Optimum interval (9500-6000 B.P., Mercone et al. [Mercone, D., Thomson, J., Croudace, I.W., Siani, G., Pateme, M., Troelstra, S., 2000. Duration of S1, the most recent sapropel in the eastern Mediterranean Sea, as indicated by accelerator mass spectrometry radiocarbon and geochemical evidence. Paleoceanography 15, 336-347]). In this period the S1 sapropel was deposited. S1 is the most recent sapropel in the succession of organic carbon-rich layers intercalated in normal Neogene sedimentary sequences. Different theories have been invoked in order to explain the deposition of this peculiar layer. Our simulations seem to indicate that the modified thermohaline circulation, supplying oxygen only in the first 500 m of the water column, is responsible for the sapropel deposition when higher productivity is allowed in the euphotic zone. The model shows the importance in this process of bacteria that consume oxygen by decomposing the Particulate Organic Matter (POM) produced in the upper water column. The sinking velocity of POM partially regulates the timescale of the occurrence of anoxia at the bottom and in the whole water column, allowing the relatively rapid onset of sapropel deposition. (c) 2005 Elsevier B.V. All rights reserved.
机译：使用一维生态系统数值模型来模拟最佳气候间隔期间东地中海公海地区可能发生的生态系统变化（9500-6000 BP，Mercone等人[Mercone，D.，Thomson ，J.，Croudace，IW，Siani，G.，Pateme，M.，Troelstra，S.，2000。加速器质谱法放射性碳和地球化学证据表明，S1的持续时间是东地中海最近的腐石。古海洋学杂志15，336-347]。在此期间，S1腐草素被沉积。 S1是插在正常新近纪沉积层序中的一系列富含有机碳的层中的最新腐殖质。为了解释该特殊层的沉积，已经引用了不同的理论。我们的模拟似乎表明，改进的热盐循环系统仅在水柱的前500 m内提供氧气，这是在富营养区允许更高的生产率的情况下造成腐殖质沉积的原因。该模型通过分解上水塔中产生的颗粒有机物（POM），显示了消耗氧气的细菌在此过程中的重要性。 POM的下沉速度部分地调节了底部和整个水柱中缺氧发生的时间尺度，从而允许相对快速地发生腐殖质沉积。 （c）2005 Elsevier B.V.保留所有权利。

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