Emil Nyman

City of Helsinki · Environment Centre

Results of the physical, chemical, hygienic and biological monitoring programme of the Helsinki metropolitan coastal sea area.

Resistant to degradation, plastic litter poses a long-term threat to marine ecosystems. Biodegradable materials have been developed to replace conventional plastics, but little is known of their impacts and degradation in marine environments. A 14-week laboratory experiment was conducted to investigate the sorption of polycyclic aromatic hydrocarbo...

Summary in English, report in Finnsih. Results of the physical, chemical, hygienic and biological monitoring of the Helsinki metropolitan coastal sea area.

Typical sea water temperatures in the coastal sea outside Helsinki (engllish summary, report in Finnsih)

An assessment of the ecological status of the coastal waters of the Helsinki metropolitan area show that for the period 2012-2015 the status varies from the bad state of the Seurasaari water area to the poor states of the Kruunuvuorenselkä, Villinki and Sipoon saaristo water areas and finally to the moderate state of the Suvisaaristo-Lauttasaari wa...

The monitoring of the water quality and aquatic environment in the Helsinki metropolitan region was renewed in 2014 when a new joint monitoring program was started. An agreement was signed by the Helsinki Region Environmental Services Authority (HSY), Port of Helsinki, Helsingin Energia (Helen Oy since 2015), Espoo Technical Services and Arctech He...

This study on the removal of microplastics during different wastewater treatment unit processes was carried out at Viikinmäki wastewater treatment plant (WWTP). The amount of microplastics in the influent was high, but it decreased significantly during the treatment process. The major part of the fibres were removed already in primary sedimentation...

The sea area outside the Helsinki metropolitan area has received large external nutrient loads for decades, both from municipal waste waters and diffuse loads. Nutrient loading has led to eutrophication of the coastal sea, which again has led to dead bottoms and anoxia or hypoxia in near bottom waters. As the external loads have diminished and the...

Helsingissä keskeisellä paikalla sijaitseva Töölönlahti on aikoinaan raskaan jätevesikuormituksen jäljiltä edelleen voimakkaasti rehevöitynyt. Vuoden 2005 lopulla alettiin Töölönlahdelle johtaa vettä Humallahdelta tarkoituksena parantaa veden laatua. Vettä on johdettu avovesiaikaan 0,5 m3 s-1, jolloin veden vaihtuvuutta on saatu tehostettua huomatt...

Helsingin ja Espoon sekä eräiden Keski-Uudenmaan kuntien jätevedet käsiteltiin vuonna 2013 Helsingin Viikinmäen ja Espoon Suomenojan jätevedenpuhdistamoissa. Viikinmäen puhdistamolta puhdistetut jätevedet johdettiin tunnelissa Katajaluodon eteläpuolelle ja Suomenojan puhdistamolta Gåsgrundet-saaren kaakkoispuolelle. Viikinmäen ja Suomenojan puhdist...

Both observations and models suggest that large-scale coastal blooms of Alexandrium fundyense in the Gulf of Maine are seeded by deep-bottom cyst accumulation zones (“seed beds”) where cysts germinate from the sediment surface or the overlying near-bottom nepheloid layers at water depths exceeding 100 m. The germling cells and their vegetative prog...

Helsingin ja Espoon sekä eräiden Keski-Uudenmaan kuntien jätevedet käsiteltiin vuonna 2012 Helsingin Viikinmäen ja Espoon Suomenojan jätevedenpuhdistamoissa. Viikinmäen puhdistamolta puhdistetut jätevedet johdettiin tunnelissa Katajaluodon eteläpuolelle ja Suomenojan puhdistamolta Gåsgrundet-saaren kaakkoispuolelle. Viikinmäen ja Suomenojan puhdist...

The effect of single nutrient additions (ammonia or phosphate) on the biomass and phosphorus dynamics of natural Baltic Sea phytoplankton bloom communities dominated by nitrogen-fixing Cyanobacteria was studied. The aim was to elucidate bloom-time phosphorus deficiency characteristics of the community. In addition, the intention was to study the ef...

Numerical simulation experiments with an eddy-resolving ocean circulation model were performed to study nutrient transport to the surface layer by summer upwelling events in the Gulf of Finland. It is shown that upwelling along the southern coast of the Gulf, produced by easterly winds, brings more nutrients to the surface layer than upwelling alon...

A high resolution numerical study is undertaken to simulate an upwelling event along the northern coast of the Gulf of Finland, 21-29 July 1999, which was documented well by in situ and remote measurements. The simulated sequence of SST maps shows a reasonably good resemblance to that of satellite infrared imagery, including both mesoscale coherent...

The Baltic Sea Science Congress was held at Rostock University, Germany, from 19 to 22 March 2007. In the session entitled"Upwelling events, coastal offshore exchange, links to biogeochemical processes" 20 presentations were given,including 7 talks and 13 posters related to the theme of the session.This paper summarises new findings of the upwellin...

The Baltic Sea Science Congress was held at Rostock University, Germany, from 19 to 22 March 2007. In the session entitled "Upwelling events, coastal offshore exchange, links to biogeochemical processes" 20 presentations were given, including 7 talks and 13 posters related to the theme of the session. This paper summarises new findings of the upwel...

Eutrophication of the Baltic Sea has potentially increased the frequency and magnitude of cyanobacteria blooms. Eutrophication leads to increased sedimentation of organic material, increasing the extent of anoxic bottoms and subsequently increasing the internal phosphorus loading. In addition, the hypoxic water volume displays a negative relationsh...

A laboratory experiment was conducted to study differences in the use of varying phosphorus sources by the bloom-forming filamentous cyanobacteria Aphanizomenon flos-aquae and Nodularia spumigena. Axenic strains were grown in typical bloom-time light regimes under phosphate-replete, added organic phosphorus phosphate-depleted and completely phospho...

Fuzzy logic was applied to model blooms of Nodularia spumigena, Dinophysis spp., Alexandrium minutum, Karenia mikimotoi and Phaeocystis globosa at various European sites as part of the Harmful Algal Blooms Expert System (HABES) project. This modelling approach was useful in performing integrated analyses of interacting physical and biological facto...

A fuzzy logic model to describe the seasonal evolution of Nodularia spumigena blooms in the Gulf of Finland was built and calibrated on the basis of monitoring data. The model includes three phosphate sources: excess phosphate after the annual spring bloom and parameterised phosphate transport to the upper mixed layer by turbulent mixing and upwell...

The effect of coastal upwelling on the late summer pelagic environment, focusing on the two main bloom-forming filamentous cyanobacteria species, Aphanizomenon flos-aquae and Nodularia spumigena, was evaluated on the basis of field observations in July and August 1999 in the western Gulf of Finland. The study consisted of biological (chlorophyll a,...

Eutrophication favours harmful algal blooms worldwide. The blooms cause toxic outbreaks and deteriorated recreational and aesthetic values, causing both economic loss and illness or death of humans and animals. The Baltic Sea is the world s only large brackish water habitat with recurrent blooms of toxic cyanobacteria capable of biological fixation...