Contemporary trends in hydrophysical and hydrochemical parameters in the NE Baltic Sea
The current study focuses on trends in hydrophysical and -chemical parameters (e.g. temperature, salinity, dissolved oxygen, chlorophyll a (Chl a), pH and nutrients) in the Estonian coastal sea and offshore areas in relation to the biogeochemical processes and marine carbon dioxide system of the Bal...
| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Estonian Academy Publishers
2020-04-01
|
| Series: | Estonian Journal of Earth Sciences |
| Subjects: | |
| Online Access: | http://www.kirj.ee/public/Estonian_Journal_of_Earth_Sciences/2020/issue_2/earth-2020-2-91-108.pdf |
| _version_ | 1818605895956824064 |
|---|---|
| author | Silvie Lainela Kristjan Herkül Ivo Leito Andres Jaanus Ülo Suursaar |
| author_facet | Silvie Lainela Kristjan Herkül Ivo Leito Andres Jaanus Ülo Suursaar |
| author_sort | Silvie Lainela |
| collection | DOAJ |
| description | The current study focuses on trends in hydrophysical and -chemical parameters (e.g. temperature, salinity, dissolved oxygen, chlorophyll a (Chl a), pH and nutrients) in the Estonian coastal sea and offshore areas in relation to the biogeochemical processes and marine carbon dioxide system of the Baltic Sea. Analysis of 586 time series of these parameters, retrieved during national monitoring activities in 1993–2017, revealed a number of significant trends, which characterize the changes in the northeastern (NE) Baltic Sea. The number of significant trends in the surface layer was slightly higher in the coastal sea area than in the offshore area. No significant (e.g. climate change-related) temperature trends were revealed in the surface layers of the Estonian offshore area. Over a longer time frame (since the 1970s–1980s), the trends in hydrochemical parameters have shown improved ecological conditions in the Estonian coastal waters, however, further improvement is not so obvious. In fact, most nutrient trends were positive over the last two decades. A positive Chl a trend was detected in the offshore area of the Baltic Proper. Dissolved oxygen trends in the bottom layers were all negative. So far, not enough parameters have been monitored for the evaluation of marine acidification processes. Several important recommendations for further improvement of monitoring programmes are suggested. |
| first_indexed | 2024-12-16T14:02:14Z |
| format | Article |
| id | doaj.art-fd9f0f931c7a4a44be6582a95d518614 |
| institution | Directory Open Access Journal |
| issn | 1736-4728 1736-7557 |
| language | English |
| last_indexed | 2024-12-16T14:02:14Z |
| publishDate | 2020-04-01 |
| publisher | Estonian Academy Publishers |
| record_format | Article |
| series | Estonian Journal of Earth Sciences |
| spelling | doaj.art-fd9f0f931c7a4a44be6582a95d5186142022-12-21T22:29:03ZengEstonian Academy PublishersEstonian Journal of Earth Sciences1736-47281736-75572020-04-016929110810.3176/earth.2020.0610.3176/earth.2020.06Contemporary trends in hydrophysical and hydrochemical parameters in the NE Baltic SeaSilvie Lainela0Kristjan Herkül1Ivo Leito2Andres Jaanus3Ülo Suursaar4Department of Marine Systems, Tallinn University of Technology, Akadeemia tee 15a, 12618 Tallinn, Estonia, Estonian Marine Institute, University of Tartu, Mäealuse 14, 12618 Tallinn, EstoniaEstonian Marine Institute, University of Tartu, Mäealuse 14, 12618 Tallinn, EstoniaInstitute of Chemistry, University of Tartu, Ravila 14a, 50411 Tartu, EstoniaEstonian Marine Institute, University of Tartu, Mäealuse 14, 12618 Tallinn, EstoniaEstonian Marine Institute, University of Tartu, Mäealuse 14, 12618 Tallinn, EstoniaThe current study focuses on trends in hydrophysical and -chemical parameters (e.g. temperature, salinity, dissolved oxygen, chlorophyll a (Chl a), pH and nutrients) in the Estonian coastal sea and offshore areas in relation to the biogeochemical processes and marine carbon dioxide system of the Baltic Sea. Analysis of 586 time series of these parameters, retrieved during national monitoring activities in 1993–2017, revealed a number of significant trends, which characterize the changes in the northeastern (NE) Baltic Sea. The number of significant trends in the surface layer was slightly higher in the coastal sea area than in the offshore area. No significant (e.g. climate change-related) temperature trends were revealed in the surface layers of the Estonian offshore area. Over a longer time frame (since the 1970s–1980s), the trends in hydrochemical parameters have shown improved ecological conditions in the Estonian coastal waters, however, further improvement is not so obvious. In fact, most nutrient trends were positive over the last two decades. A positive Chl a trend was detected in the offshore area of the Baltic Proper. Dissolved oxygen trends in the bottom layers were all negative. So far, not enough parameters have been monitored for the evaluation of marine acidification processes. Several important recommendations for further improvement of monitoring programmes are suggested.http://www.kirj.ee/public/Estonian_Journal_of_Earth_Sciences/2020/issue_2/earth-2020-2-91-108.pdfmonitoringtrendseutrophicationmarine carbon dioxide systemenvironmental change. |
| spellingShingle | Silvie Lainela Kristjan Herkül Ivo Leito Andres Jaanus Ülo Suursaar Contemporary trends in hydrophysical and hydrochemical parameters in the NE Baltic Sea Estonian Journal of Earth Sciences monitoring trends eutrophication marine carbon dioxide system environmental change. |
| title | Contemporary trends in hydrophysical and hydrochemical parameters in the NE Baltic Sea |
| title_full | Contemporary trends in hydrophysical and hydrochemical parameters in the NE Baltic Sea |
| title_fullStr | Contemporary trends in hydrophysical and hydrochemical parameters in the NE Baltic Sea |
| title_full_unstemmed | Contemporary trends in hydrophysical and hydrochemical parameters in the NE Baltic Sea |
| title_short | Contemporary trends in hydrophysical and hydrochemical parameters in the NE Baltic Sea |
| title_sort | contemporary trends in hydrophysical and hydrochemical parameters in the ne baltic sea |
| topic | monitoring trends eutrophication marine carbon dioxide system environmental change. |
| url | http://www.kirj.ee/public/Estonian_Journal_of_Earth_Sciences/2020/issue_2/earth-2020-2-91-108.pdf |
| work_keys_str_mv | AT silvielainela contemporarytrendsinhydrophysicalandhydrochemicalparametersinthenebalticsea AT kristjanherkul contemporarytrendsinhydrophysicalandhydrochemicalparametersinthenebalticsea AT ivoleito contemporarytrendsinhydrophysicalandhydrochemicalparametersinthenebalticsea AT andresjaanus contemporarytrendsinhydrophysicalandhydrochemicalparametersinthenebalticsea AT ulosuursaar contemporarytrendsinhydrophysicalandhydrochemicalparametersinthenebalticsea |