Transport of fresh and resuspended particulate organic material in the Baltic Sea — a model study

• Published in: Journal of marine systems Vol. 87; no. 1; pp. 1 - 12
• Main Authors: Almroth-Rosell, Elin, Eilola, Kari, Hordoir, Robinson, Meier, H.E. Markus, Hall, Per O.J.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.07.2011
• Subjects: Baltic Proper; Baltic Sea; Carbon; Chemical Sciences; Critical shear stress; Ecological modelling; Erosion; Imports; Kemi; Marine; Model study; Nutrients; Ocean models; Organic materials; Organic matter transport; Resuspension; Sediment type; Transport; Resuspension; Ecological modelling; Critical shear stress; Model study; Baltic Proper; Sediment type; Organic matter transport; Baltic Sea
• ISSN: 0924-7963; 1879-1573
• DOI: 10.1016/j.jmarsys.2011.02.005

A fully coupled high-resolution 3-dimensional biogeochemical–physical ocean model including an empirical wave model was used to investigate the long-term average (1970–2007) distributions and transports of resuspended matter and other types of suspended organic matter in the Baltic Sea. Modelled bottom types were compared to observations and the results showed that the model successfully managed to capture the horizontal, as well as the vertical, distribution of the different bottom types: accumulation, transport and erosion bottoms. The model also captured well the nutrient element contents in the sediments. On average the largest contribution of resuspended organic carbon to the transport of total organic carbon is found at erosion and transport bottoms. Although the relative transport of resuspended organic carbon at deeper accumulation bottoms in general is low (< 10% of total), the central parts of the sub-basins act on average as sinks that import organic matter while the more shallow areas and the coastal regions acts as sources of organic carbon in the water column. This indicates that the particulate organic matter produced in erosion and transport areas might be kept in suspension long enough to be transported and settle in less energetic areas, i.e. on accumulation bottoms. ►A high-resolution 3-D biogeochemical-physical ocean model including resuspension. ►Model transports and distributions of resuspended organic matter in the Baltic Sea. ►Model the distribution of erosion, transport and accumulation bottom types. ►Resuspended organic matter was mainly found on transport and erosion bottoms. ►Fresh organic matter is kept in suspension for transports to lower energetic areas.