Academy of Finland
Funding decision
 
Name Hietanen, Susanna
Organisation HY
Project title Biogeochemical links between climate change and eutrophication in the Baltic Sea
Decision No. 267112
Decision date 08.04.2013
Funding period 01.09.2013 - 31.08.2018
Funding 425 005
WebFOCUS Report
Project description
The Baltic Sea suffers from eutrophication, accelerated by climate change. Increasing rainfall carries more loading to the Sea and strengthens stratification, resulting in hypoxia and anoxia. These disturb mineralization processes, accelerating eutrophication and greenhouse gas production. In this project we studied nutrient and greenhouse gas processes in coastal sediments at research stations and in open sea deep basins onboard research vessels. Despite the strong methane production in coastal and open sea sediments, the amount of methane released from the sea is low, as oxidation in sediments and water column efficiently removes methane. The production of nitric oxide in sediments is mainly negligible, and in deep basins it only occurs in water column during disturbances, such as saltwater inflows. Both the nitrogen load and the nitrogen removal capacity in the Baltic Sea increase from north to south, and the removal capacity is similar in mud and sand sediments in aphotic depths.