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, nitrite or ammonium. One very clear indication of increased levels of nutrients in the sea is the increase in hair-like fast-growing green and red algae. Common seaweed becomes overgrown by the algae hairs and disappears. Eelgrass meadows, which are important nursery habitats for fish, are also badly Last updated: Mar 20, 2017

The main source is plastic in different sizes and shapes, which makes its way out to sea and collects just under the surface. Most of it has broken down into very small particles, often barely visible to the human eye. This makes it difficult to collect and it is not visible on satellite pictures Last updated: Apr 23, 2014

pictures as yellow-green twisting areas on the sea surface. The white areas in the pictures are clouds and the light blue areas are high clouds which in some cases make the pictures difficult to interpret. Dark blue areas are algae-free water. The pictures have a resolution of 500 m.   The dominant species Last updated: Mar 20, 2017

Baltic Sea are areas where the physical conditions in the sea are important for the inflow of cold water rich in oxygen that ventilate the sea-bed of the Baltic Sea. We have on several occasions assessed the potential impact of wind power plant parks on the vertical mixing in the sea , and whether it Last updated: Oct 24, 2022

North Sea. The Skagerrak has a significant salty layer that starts at a depth of 10-20 metres, where the salinity is 35 psu and the temperature is 6 degrees. The salinity of the surface water is 25-30 psu and the temperature varies seasonally between 6 and 20 degrees. The temperature layer often reaches Last updated: Apr 23, 2014

Researchers from SMHI have participated in international projects involving new calculations concerning nutrient discharges from land into the Baltic Sea in order to study how changes in climate and society around the Baltic Sea could impact on the marine region. In the calculations, the Last updated: Jan 19, 2024

A climatology atlas of the oxygen situation in the deep water of the Baltic Sea was published in 2011 in the SMHI Report Oceanography No 42. The results for 2011 were preliminary and have in this report been updated as new additional data have been reported to ICES. The results for 2012 are Last updated: Apr 23, 2014

data sets, a reanalysis can be made, which means that fixed versions of the numerical model and the data assimilation system are used to analyse a period of several years. This report describes an oceanographic reanalysis covering the period 1990 to 2004 (15 whole years). The horizontal resolution is 3 Last updated: Apr 23, 2014

Sea transition zone even treat CDOM as conservative tracer to identify the origin of water masses (Højerslev et al. (1996), Sedmon et al. (2010)). This assumption is based on the close relation be- tween salinity and CDOM reported e.g. by Ferrari et al. (1998), Kowalczuk et al. (1998), Kowalczuk et al Last updated: Nov 26, 2015

Sea transition zone even treat CDOM as conservative tracer to identify the origin of water masses (Højerslev et al. (1996), Sedmon et al. (2010)). This assumption is based on the close relation be- tween salinity and CDOM reported e.g. by Ferrari et al. (1998), Kowalczuk et al. (1998), Kowalczuk et al Last updated: Nov 26, 2015