Change search
Link to record
Permanent link

Direct link
BETA
Johansson, Johannes
Publications (3 of 3) Show all publications
Karlson, B., Eilola, K., Johansson, J., Linders, J., Mohlin, M., Willstrand Wranne, A. & Wåhlstrom, I. (2017). Distribution of cyanobacteria blooms in the Baltic Sea. In: Proenca, L. A. O. and Hallegraeff, G. (Ed.), Proenca, L. A. O. and Hallegraeff, G. (Ed.), Marine and Fresh-Water Harmful Algae.: . Paper presented at Proceedings of the 17th International Conference on Harmful Algae. (pp. 100-103). International Society for the Study of Harmful Algae Intergovernmental Oceanographic Commission of UNESCO
Open this publication in new window or tab >>Distribution of cyanobacteria blooms in the Baltic Sea
Show others...
2017 (English)In: Marine and Fresh-Water Harmful Algae. / [ed] Proenca, L. A. O. and Hallegraeff, G., International Society for the Study of Harmful Algae Intergovernmental Oceanographic Commission of UNESCO , 2017, p. 100-103Conference paper, Published paper (Refereed)
Place, publisher, year, edition, pages
International Society for the Study of Harmful Algae Intergovernmental Oceanographic Commission of UNESCO, 2017
National Category
Oceanography, Hydrology and Water Resources
Research subject
Oceanography
Identifiers
urn:nbn:se:smhi:diva-4477 (URN)978-87-990827-6-6 (ISBN)
Conference
Proceedings of the 17th International Conference on Harmful Algae.
Available from: 2018-01-24 Created: 2018-01-24 Last updated: 2018-01-24Bibliographically approved
Wesslander, K., Andersson, L., Axe, P., Johansson, J., Linders, J., Nexelius, N. & Skjevik, A.-T. (2017). Swedish National Report on Eutrophication Status in the Skagerrak, Kattegat and the Sound - OSPAR ASSESSMENT 2016.
Open this publication in new window or tab >>Swedish National Report on Eutrophication Status in the Skagerrak, Kattegat and the Sound - OSPAR ASSESSMENT 2016
Show others...
2017 (English)Report (Other academic)
Abstract [en]

The Swedish OSPAR waters were assessed by applying the OSPAR Common Procedure for the time period 2006 – 2014. The Swedish parts of Skagerrak, Kattegat and the Sound constitute the outer part of the transition zone between the estuarine Baltic Sea and the oceanic North Sea and were investigated for nutrients, chlorophyll-a,oxygen, macrophytes, phytoplankton and zoobenthos. The conclusion from the overall assessment of the Swedish OSPAR waters was that only Skagerrak open sea could be classified as a Non-Problem Area and all other assessment units were classified as Problem Areas.  Atmospheric input of nitrogen significantly decreased in both Skagerrak and Kattegat and the land based input of total nutrients also decreased in Skagerrak, Kattegat as well as the Sound. However, the short-term trend of nitrogen input to the Sound was positive. Skagerrak is governed by trans-boundary transports from the North Sea of mainly nitrogen but also phosphorus. Kattegat receives trans-boundary nutrients from both the Baltic Sea through the Sound and from Skagerrak and transports nutrients towards the coast and the western part of the basin.  Overall, concentrations of DIN, DIP, TN and chlorophyll-a decreased in most areas, however, no significant trends were found for DIP. Increasing concentrations were found in silicate, POC and TP. The Secchi depth increased in most areas. Oxygen deficiency was mainly a problem in the fjords and the Kattegat open sea.  In Skagerrak coastal waters winter nutrients were only elevated in the fjords. Concentrations of DIN generally decreased significantly and there were tendencies of decreasing DIP. This pattern was also supported by the total nitrogen while total phosphorus increased. Secchi depth was improving and there was a significant positive trend of increasing depths. However, zoobenthos were still in bad condition and phytoplankton indicator species were often elevated. Chlorophyll-a concentrations were generally decreasing but still elevated in the inner coastal waters. There were also problems with algal toxins such as DST (Diarrhetic Shellfish Toxin) and PST (Paralystic Shellfish Toxin) infections in the area. According to the OSPAR classification scheme, a unit with no evident increased nutrient enrichment can be classified as a Problem Area but the cause might be due to trans-boundary transport from adjacent areas. In the open area of Kattegat there were still problems with oxygen deficiency, especially in the southern parts, even though the trend was significantly positive for the assessment period 2006 – 2014. Concentrations of chlorophyll-a and DIN decreased significantly, however, DIN levels were still generally elevated, especially in the southern parts of Kattegat while DIP was closer to the assessment level. In Kattegat coastal waters winter nutrients were elevated in all assessment units, except from the inner coastal waters, even though there was a general pattern of decreasing going trends. Chlorophyll-a was mainly elevated in the Sound and the estuaries. Secchi depth is generally improving and a significant increase was seen in the Sound. Also in Kattegat, zoobenthos were in bad condition and phytoplankton indicator species were often elevated. 

Publisher
p. 160
Series
RO, Report Oceanography, ISSN 0283-1112
Keywords
OSPAR, assessment, eutrophication, Skagerrak, Kattegat
National Category
Oceanography, Hydrology and Water Resources
Research subject
Oceanography
Identifiers
urn:nbn:se:smhi:diva-4120 (URN)
Available from: 2017-08-01 Created: 2017-08-01 Last updated: 2018-01-13Bibliographically approved
Johansson, J. & Hansson, M. (2016). Slutrapport 2015 för uppdraget ”Databaslagring av historiska fys/kemdata från Stockholm Vatten”: Datavärdskapet Oceanografi och Marinbiologi.
Open this publication in new window or tab >>Slutrapport 2015 för uppdraget ”Databaslagring av historiska fys/kemdata från Stockholm Vatten”: Datavärdskapet Oceanografi och Marinbiologi
2016 (Swedish)Report (Other academic)
Abstract [sv]

SMHI är datavärd för marinbiologiska och oceanografiska data på uppdrag av Havs- och vattenmyndigheten. I detta uppdrag från Havs- och vattenmyndigheten som är kopplat till datavärdskapet har datavärden genomfört databasläggning av fysikaliska och kemiska data från Stockholm Vatten AB. Arbetet har omfattat två stora dataset som täcker två perioder; 1968-1981 och 1982-2012.

Abstract [en]

SMHI (Swedish Meteorological and Hydrological Institute) withholds the hosting of Oceanographic and Marine biological data on behalf of the Swedish Agency for Marine and Water Management. During this project SMHI has handled and stored physical and chemical data to database where data originates from Stockholm Vatten AB. Data is separated into two major datasets from the periods; 1968-1981 and 1982-2012.

Publisher
p. 8
Series
Oceanography, ISSN 0283-7714 ; 120
National Category
Oceanography, Hydrology and Water Resources
Research subject
Oceanography
Identifiers
urn:nbn:se:smhi:diva-2155 (URN)
Available from: 2016-05-11 Created: 2016-05-11 Last updated: 2018-01-10Bibliographically approved
Organisations

Search in DiVA

Show all publications
v. 2.35.7
|