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Research project Analyses of syntheses of long-term monitoring data

This research project evaluates basin wide monitoring data from the Swedish Meteorological and Hydrological Institute (SMHI). The aim of the research project is understanding basin wide nutrient and oxygen transformation processes based on long-term monitoring data.

Find out more about the research project on the Swedish webpage, by clicking on the globe icon next to the headline.

Project members

Project managers

Carl Rolff

Environmental Analyst

Stockholm University Baltic Sea Centre

carl.rolff@su.se

Publications

How oxygen deficiency in the Baltic Sea proper has spread and worsened

How oxygen deficiency in the Baltic Sea proper has spread and worsened: The role of ammonium and hydrogen sulphide. https://doi.org/10.1007/s13280-022-01738-8 Carl Rolff, Jakob Walve, Ulf Larsson & Ragnar Elmgren. Ambio 51, 2308–2324 (2022)

News

2022-11-03

The Baltic Sea oxygen debt worse than ever

The Baltic Sea suffers from serious oxygen deficiency. Even large inflows of oxygen-rich seawater have in recent decades only provided short-term relief from oxygen deficiency in the deep water. In the latest issue of Ambio, a new method for quantifying the total oxygen debt from Öresund to Åland is presented. By using existing data dating back to the 1960s, the researchers show that we have gone from a supply of about 10 million tons of oxygen in the deep water to a net oxygen supply close to zero, with an oxygen debt of up to 4 million tons caused by accumulated hydrogen sulfide and ammonium. In the last 20 years, the oxygen debt has also spread to near-halocline waters west of Gotland.

Oceans and Lakes Climate and Environment