effects of the 2014 major baltic inflow on methane and nitrous oxide dynamics in the water column of the central baltic sea
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2017
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Abstract
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.
| Reference Key |
myllykangas2017eartheffects
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|---|---|
| Authors | ;J.-P. Myllykangas;T. Jilbert;G. Jakobs;G. Jakobs;G. Rehder;J. Werner;S. Hietanen |
| Journal | itinéraires |
| Year | 2017 |
| DOI |
10.5194/esd-8-817-2017
|
| URL | |
| Keywords |
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