Methane and nitrous oxide concentration profiles, CTD and nutrient data from the Central Baltic Sea between March and December 2015, following the major Baltic Inflow of 2014
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| Format: | Dataset Open Access |
| Langue: | en |
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PANGAEA
2017
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| _version_ | 1867170472019361792 |
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| author | Myllykangas, Jukka-Pekka Jilbert, Tom Jakobs, Gunnar Rehder, Gregor Werner, Jan Hietanen, Susanna |
| author_facet | Myllykangas, Jukka-Pekka Jilbert, Tom Jakobs, Gunnar Rehder, Gregor Werner, Jan Hietanen, Susanna |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | In late 2014, a large, oxygen-rich salt water inflow entered the Baltic Sea and caused considerable changes in deep water oxygen concentrations. We studied the effects of the inflow on the concentration patterns of two greenhouse gases, methane and nitrous oxide, during the following year (2015) in the water column of the Gotland Basin. In the Eastern basin, methane which had previously accumulated in the deep waters was largely removed during the year. Here, volume-weighted mean concentration below 70 m decreased from 108 nM in March to 16.3 nM over a period of 141 days (0.65 nM d-1), predominantly due to oxidation (up to 79 %) following turbulent mixing with the oxygen-rich inflow. In contrast nitrous oxide, which was previously absent from deep waters, accumulated in deep waters due to enhanced nitrification following the inflow. Volume-weighted mean concentration of nitrous oxide below 70 m increased from 11.8 nM in March to 24.4 nM in 141 days (0.09 nM d-1). A transient extreme accumulation of nitrous oxide (877 nM) was observed in the deep waters of the Eastern Gotland Basin towards the end of 2015, when deep waters turned anoxic again, sedimentary denitrification was induced and methane was reintroduced to the bottom waters. The Western Gotland Basin gas biogeochemistry was not affected by the inflow. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_880534 |
| institution | PANGAEA |
| language | en |
| publishDate | 2017 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Methane and nitrous oxide concentration profiles, CTD and nutrient data from the Central Baltic Sea between March and December 2015, following the major Baltic Inflow of 2014 Myllykangas, Jukka-Pekka Jilbert, Tom Jakobs, Gunnar Rehder, Gregor Werner, Jan Hietanen, Susanna GotlandBasin; Gotland Basin; MULT; Multiple investigations In late 2014, a large, oxygen-rich salt water inflow entered the Baltic Sea and caused considerable changes in deep water oxygen concentrations. We studied the effects of the inflow on the concentration patterns of two greenhouse gases, methane and nitrous oxide, during the following year (2015) in the water column of the Gotland Basin. In the Eastern basin, methane which had previously accumulated in the deep waters was largely removed during the year. Here, volume-weighted mean concentration below 70 m decreased from 108 nM in March to 16.3 nM over a period of 141 days (0.65 nM d-1), predominantly due to oxidation (up to 79 %) following turbulent mixing with the oxygen-rich inflow. In contrast nitrous oxide, which was previously absent from deep waters, accumulated in deep waters due to enhanced nitrification following the inflow. Volume-weighted mean concentration of nitrous oxide below 70 m increased from 11.8 nM in March to 24.4 nM in 141 days (0.09 nM d-1). A transient extreme accumulation of nitrous oxide (877 nM) was observed in the deep waters of the Eastern Gotland Basin towards the end of 2015, when deep waters turned anoxic again, sedimentary denitrification was induced and methane was reintroduced to the bottom waters. The Western Gotland Basin gas biogeochemistry was not affected by the inflow. |
| title | Methane and nitrous oxide concentration profiles, CTD and nutrient data from the Central Baltic Sea between March and December 2015, following the major Baltic Inflow of 2014 |
| topic | GotlandBasin; Gotland Basin; MULT; Multiple investigations |
| url | https://doi.org/10.1594/PANGAEA.880534 |