Geoscience Reference
In-Depth Information
Fig. 18.1
The Oder (Szczecin) Lagoon and the Pomeranian Bay together form the Oder estuary.
Indicated are the sampling stations KHM: Oder Lagoon centre, OB4: mouth of the Swina channel
and OB14: Pomeranian Bay. The lagoon's maximum length is about 40 km
The objectives of this study are (a) to give an overview about the long-term phos-
phorus load history in the river and its effects in the estuary, (b) to reflect the present
state of integrated river basin-coastal water nutrient modelling and its contribution
to our understanding of the phosphorus dynamics in the estuary, (c) to analyse the
different phosphorus sources and their quantitative role in the phosphorus availabil-
ity of the estuary, with special focus on anoxic phosphorus release from sediments,
and (d) to discuss the implications for the management of the estuary and the Baltic
Sea. For this purpose, we use the long-term monitoring data in combination with
a river basin nutrient load model (MONERIS) and a 3D ecosystem model of the
estuary (ERGOM).
18.2 Methods and Models
German/Polish monitoring data have been provided by the Wojewódzki Inspektorat
Ochrony Srodowiska w Szczecinie (WIOS) and the Landesamt für Umwelt,
Naturschutz und Geologie (LUNG). The regular hydro-biological and hydrochemi-
cal monitoring in the estuary started in the early 1970s. In the lagoon, altogether
12 stations are sampled on the Polish and on the German side; 4 stations exist
in the Pomeranian Bay. Nowadays, the sampling frequency is 1 month and inter-
calibration exercises as well as harmonized sampling dates ensure reliability and
comparability. We refer to three sampling stations, KHM in the Oder Lagoon cen-
tre, OB4 at the Swina channel mouth and OB14 in the coastal Pomeranian Bay. The
The ecosystem model ERGOM is an integrated biogeochemical model linked to
a 3D circulation model covering the entire Baltic Sea. The circulation model is an
