Simulated halocline variability in the Baltic Sea and its impact on hypoxia during 1961-2007
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In this paper, a three-dimensional ocean circulation model was used to study the salinity and halocline depth variations in the Baltic Sea during 1961-2007, with a cutoff period of 4 years, henceforth called the mean zonal wind stress.Abstract:
[1] Salinity and halocline depth variations in the Baltic Sea during 1961–2007 are studied using a three-dimensional ocean circulation model. Significant interannual and interdecadal variations in the halocline depth are found, together with distinct periods characterized either by shallow (1970–1975) or deep halocline (1990–1995). The model simulation indicates that the mean top layer salinity in the Baltic Sea is mainly controlled by the accumulated river runoff, while the mean below halocline salinity in the Baltic proper (which comprises Bornholm and Gotland basins) is more dependent on the low-pass filtered zonal wind stress, with cutoff period of 4 years, henceforth called the mean zonal wind stress. The halocline depth and stratification strength in the Baltic Sea are significantly affected by the mean zonal wind stress, while the impact of runoff is smaller. The ventilation of the halocline from bottom layers is stronger during the shallow and from surface layers during the deep halocline period. Due to changes in ventilation variations in halocline depth systematically affect bottom oxygen concentrations on seasonal and decadal, but not on interannual time scales. For instance, a deeper halocline reduces hypoxic (oxygen concentration in bottom water below 2 mL/L) and anoxic (anoxic conditions in bottom water) areas and increases the bottom oxygen concentrations in the Gulf of Finland but decreases them in the deeper parts of the Baltic proper. Model results suggest that due to undersampling during 1961–2007 mean hypoxic and anoxic areas calculated from observed profiles are underestimated by 41% and 43%, respectively.read more
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References
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Journal ArticleDOI
Decadal Trends in the North Atlantic Oscillation: Regional Temperatures and Precipitation
TL;DR: An evaluation of the atmospheric moisture budget reveals coherent large-scale changes since 1980 that are linked to recent dry conditions over southern Europe and the Mediterranean, whereas northern Europe and parts of Scandinavia have generally experienced wetter than normal conditions.
Journal ArticleDOI
The ERA‐40 re‐analysis
S. Uppala,Per Kållberg,Adrian Simmons,U. Andrae,V. da Costa Bechtold,M. Fiorino,J. K. Gibson,J. Haseler,A. Hernandez,Graeme Kelly,Xiaoming Li,Kazutoshi Onogi,Sami Saarinen,N. Sokka,Richard P. Allan,Richard P. Allan,Erik Andersson,Klaus Arpe,Magdalena Balmaseda,Anton Beljaars,L. van de Berg,Jean Bidlot,Niels Bormann,S. Caires,Frédéric Chevallier,A. Dethof,M. Dragosavac,Michael Fisher,Manuel Fuentes,Stefan Hagemann,Elías Hólm,Brian J. Hoskins,Lars Isaksen,Peter A. E. M. Janssen,Roy L. Jenne,A. P. McNally,Jean-François Mahfouf,Jean-Jacques Morcrette,Nick Rayner,Roger Saunders,P. Simon,Andreas Sterl,Kevin E. Trenberth,A. Untch,Drasko Vasiljevic,Pedro Viterbo,John S. Woollen +46 more
TL;DR: ERA-40 is a re-analysis of meteorological observations from September 1957 to August 2002 produced by the European Centre for Medium-Range Weather Forecasts (ECMWF) in collaboration with many institutions as mentioned in this paper.
Journal ArticleDOI
The Rossby Centre Regional Climate model RCA3: model description and performance
Patrick Samuelsson,Colin Jones,Ulrika Willén,Anders Ullerstig,Stefan Gollvik,Ulf Hansson,Christer Jansson,Erik Kjellström,Grigory Nikulin,Klaus Wyser +9 more
TL;DR: The Rossby Centre Regional Climate Model (RCA3) as mentioned in this paper is the most recent version of the RCA3 model and is based on a tiled land-surface scheme.
Journal ArticleDOI
Hypoxia-Related Processes in the Baltic Sea
Daniel J. Conley,Svante Björck,Erik Bonsdorff,Jacob Carstensen,Georgia Destouni,Bo G. Gustafsson,Susanna Hietanen,Marloes Kortekaas,Harri Kuosa,H. E. Markus Meier,Baerbel Muller-Karulis,Kjell Nordberg,Alf Norkko,Gertrud K. Nürnberg,Heikki Pitkänen,Nancy N. Rabalais,Rutger Rosenberg,Oleg P. Savchuk,Caroline P. Slomp,Maren Voss,Fredrik Wulff,Lovisa Zillén +21 more
TL;DR: The Baltic Sea is unique for coastal marine ecosystems experiencing N losses in hypoxic waters below the halocline, and Nutrient load reductions are needed to reduce the extent, severity, and effects of hypoxia.
Journal ArticleDOI
Characteristics of major Baltic inflows—a statistical analysis
Wolfgang Matthäus,Herbert Franck +1 more
TL;DR: In this paper, the sea level conditions associated with major Baltic inflows are investigated in detail by studying the sea-level difference between the Kattegat and Baltic Sea, and the Baltic sea level variations, during certain periods in each complete inflow process.
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