In English and Swedish -
A climatological atlas of the oxygen situation in the deep water of the Baltic Sea was first
published in 2011 in SMHI Report Oceanography No 42. Since 2011, annual updates have been
made as additional data have been reported to ICES. In this report the results for 2014 have
been updated and the preliminary results for 2015 are presented. Oxygen data from 2015 have
been collected during the annual Baltic International Acoustic Survey (BIAS) and from national
monitoring programmes with contributions from Sweden, Finland, Poland, Estonia and
Germany.
For the autumn period, August to October, each profile in the dataset was examined for the
occurrence of hypoxia (oxygen deficiency) and anoxia (total absence of oxygen). The depths of
onset of hypoxia and anoxia were then interpolated between sampling stations producing two
surfaces representing the depth at which hypoxic respectively anoxic conditions are found. The
volume and area of hypoxia and anoxia have been calculated and the results have then been
transformed to maps and diagrams to visualize the annual autumn oxygen situation during the
analysed period.
The updated results for 2014 and the preliminary results for 2015 show that the extreme oxygen
conditions in the Baltic Proper after the regime shift in 1999 continue. Both the areal extent and
the volume with anoxic conditions have, after 1999, been constantly elevated to levels only
observed occasionally before the regime shift. Despite the major inflow to the Baltic Sea in
December 2014 approximately 16% of the bottom area was affected by anoxia and 29% by
hypoxia during 2015.
see http://www.smhi.se/polopoly_fs/1.99...l1/file/Oxygen_timeseries_1960_2015_final.pdf
A climatological atlas of the oxygen situation in the deep water of the Baltic Sea was first
published in 2011 in SMHI Report Oceanography No 42. Since 2011, annual updates have been
made as additional data have been reported to ICES. In this report the results for 2014 have
been updated and the preliminary results for 2015 are presented. Oxygen data from 2015 have
been collected during the annual Baltic International Acoustic Survey (BIAS) and from national
monitoring programmes with contributions from Sweden, Finland, Poland, Estonia and
Germany.
For the autumn period, August to October, each profile in the dataset was examined for the
occurrence of hypoxia (oxygen deficiency) and anoxia (total absence of oxygen). The depths of
onset of hypoxia and anoxia were then interpolated between sampling stations producing two
surfaces representing the depth at which hypoxic respectively anoxic conditions are found. The
volume and area of hypoxia and anoxia have been calculated and the results have then been
transformed to maps and diagrams to visualize the annual autumn oxygen situation during the
analysed period.
The updated results for 2014 and the preliminary results for 2015 show that the extreme oxygen
conditions in the Baltic Proper after the regime shift in 1999 continue. Both the areal extent and
the volume with anoxic conditions have, after 1999, been constantly elevated to levels only
observed occasionally before the regime shift. Despite the major inflow to the Baltic Sea in
December 2014 approximately 16% of the bottom area was affected by anoxia and 29% by
hypoxia during 2015.
see http://www.smhi.se/polopoly_fs/1.99...l1/file/Oxygen_timeseries_1960_2015_final.pdf
Wow I did not know the extent
