Instituto de Ciencias Marinas de Andalucía (CSIC), Campus Universitario Río San Pedro, 11519 Puerto Real, Cádiz, Spain; CEI-MAR International Campus of Excellence of the Sea, Spain.
Departamento de Química-Física, Facultad de Ciencias del Mar y Ambientales, Universidad de Cádiz, Campus Río San Pedro s/n, Puerto Real, Cádiz 11510, Spain; Ecología Funcional de Sistemas Acuáticos, Centro Universitario Regional Este, Universidad de la República, Rocha, Uruguay.
Sci Total Environ. 2018 Jul 15;630:1583-1595. doi: 10.1016/j.scitotenv.2018.02.293. Epub 2018 Mar 7.
Dissolved organic matter (DOM) is a major component of the organic matter pool, playing a key role in the global ocean functioning. However, studies on DOM in waters of many ocean regions, such as the Gulf of Cadiz (GoC), are poorly known. Advanced aquatic sensors enable autonomous for long-term deployments in situ collection of high frequency DOM data using fluorescent dissolved organic matter (FDOM) as a proxy. The present study evaluates the relevance of FDOM, the estuarine influence and the environmental factors that determine its spatial distribution in the GoC. Our results suggest that the GoC water mass, under the estuarine influence of three main rivers, is receiving large amounts of DOM transported mainly by Guadalquivir and Guadiana rivers and much less from Tinto-Odiel. Salinity is the main factor explaining the FDOM variability within the Guadalquivir and Guadiana rivers and in the inner shelf of the GoC. In the outer shelf of the GoC, plankton-produced DOM could explain the persistent spatial pattern of FDOM, playing an important role in the dynamics of FDOM from the North area of the GoC through the persistent low-salinity Eastern North Atlantic Central Water. The oceanographic dynamics and the spatial pattern of FDOM concentration in the continental shelf of the GoC suggest a net transport of FDOM through the GCC (Gulf of Cadiz Current) to the Mediterranean Sea.
溶解有机物 (DOM) 是有机质库的主要组成部分，在全球海洋功能中起着关键作用。然而，对于许多海洋区域（如加的斯湾 (GoC)）的 DOM 研究知之甚少。先进的水生传感器能够使用荧光溶解有机物 (FDOM) 作为示踪剂，进行自主的长期原位高频 DOM 数据采集。本研究评估了 FDOM 的相关性、河口影响以及决定其在 GoC 空间分布的环境因素。我们的结果表明，在三条主要河流的河口影响下，GoC 水体接收了大量由 Guadalquivir 和 Guadiana 河流输送的 DOM，而由 Tinto-Odiel 输送的 DOM 要少得多。盐度是 Guadalquivir 和 Guadiana 河流以及 GoC 内部陆架内 FDOM 变异性的主要解释因素。在 GoC 的外陆架，浮游生物产生的 DOM 可以解释 FDOM 的持续空间格局，在 GoC 北部地区通过持续低盐度东北大西洋中部水的 FDOM 动力学中发挥重要作用。GoC 大陆架的海洋动力学和 FDOM 浓度的空间格局表明，通过 GCC（加的斯湾流）向地中海输送了净的 FDOM 通量。
