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Synoptic changes in the deep rim current during stagnant hydrographic conditions in the Eastern Gotland Basin, Baltic Sea

100%

Hagen E., Feistel R.

Oceanologia

|

2007

|

tom 49

|

nr 2

Hydrographic and current measurements are analysed for stagnant deep-water conditions over the south-eastern topographic flank of the Eastern Gotland Basin (EGB) in April 2000. Results suggest a prevailing barotropic motion mode on a synoptic scale of several days. Deep along-slope volume transports derived from subsurface current meter moorings are compared with those of the baroclinic fraction of geostrophic motions crossing the plane of a hydrographic section. This was aligned perpendicular to deep isobaths and was repeated 40 times with a time step of six hours. Changes in regional winds produced a quasi-ten day cycle in the filling level of the Baltic Proper. Associated wave-like fluctuations of the mass field propagated cyclonically with a velocity of about 0.04 m s−1 around the deep basin’s rim. It is concluded that associated changes in deep volume transports result mainly from barotropically governed advection processes and that those of the baroclinic component of geostrophic currents provide a qualitatively and quantitatively quite inaccurate description of related transport fluctuations on a daily scale.

2

Seasonal fluctuations and long-term trends of nutrient concentrations in the Polish zone of the Baltic Sea

84%

Trzosinska A.

Oceanologia

|

1990

|

tom 29

3

Primary production of the Southern Baltic in 1979-1983

84%

Renk H.

Oceanologia

|

1990

|

tom 29

4

Oxygen and thermohaline conditions in the Polish fishing zone in 1979—1983

84%

Cyberska B., Lauer Z.

Oceanologia

|

1990

|

tom 29

5

Unusual Baltic inflow activity in 2002-2003 and varying deep-water properties

84%

Feistel R., Nausch G., Hagen E.

Oceanologia

|

2006

|

tom 48

|

nr S

The unusual sequence of inflow events into the Baltic Sea that occurred in 2002 and 2003 includes the first ever important baroclinic inflow to be described (August 2002), the Major Baltic Inflow (January 2003), which gave rise to the highest oxygen levels in the Gotland Deep since the 1930s, and the baroclinic inflow (August 2003) that elevated the Gotland Basin deep water salinity to values last observed in 1977, and caused the surface salinity to rise again. From these trend changes, salt residence times were estimated at about 20 years in the deep waters and 30 years above the pycnocline. Ventilation of the remote Karlsö Deep took until 2005, two years after the inflow event responsible, at a time when the Bornholm and Eastern Gotland Basins were already returning to stagnation.

Ograniczanie wyników

5 Oceanologia

2 Feistel R.

2 Hagen E.

1 Cyberska B.

1 Lauer Z.

1 Nausch G.

1 Renk H.

1 Trzosinska A.

1 2007

1 2006

3 1990

Synoptic changes in the deep rim current during stagnant hydrographic conditions in the Eastern Gotland Basin, Baltic Sea

Seasonal fluctuations and long-term trends of nutrient concentrations in the Polish zone of the Baltic Sea

Primary production of the Southern Baltic in 1979-1983

Oxygen and thermohaline conditions in the Polish fishing zone in 1979—1983

Unusual Baltic inflow activity in 2002-2003 and varying deep-water properties