Abstract
A regional ocean circulation model was used to project Baltic Sea climate at the end of the twenty-first century. A set of four scenario simulations was performed utilizing two global models and two forcing scenarios. To reduce model biases and to spin up future salinity the so-called Δ-change approach was applied. Using a regional coupled atmosphere–ocean model 30-year climatological monthly mean changes of atmospheric surface data and river discharge into the Baltic Sea were calculated from previously conducted time slice experiments. These changes were added to reconstructed atmospheric surface fields and runoff for the period 1903–1998. The total freshwater supply (runoff and net precipitation) is projected to increase between 0 and 21%. Due to increased westerlies in winter the annual mean wind speed will be between 2 and 13% larger compared to present climate. Both changes will cause a reduction of the average salinity of the Baltic Sea between 8 and 50%. Although salinity in the entire Baltic might be significantly lower at the end of the twenty-first century, deep water ventilation will very likely only slightly change. The largest change is projected for the secondary maximum of sea water age within the halocline. Further, the average temperature will increase between 1.9 and 3.2°C. The temperature response to atmospheric changes lags several months. Future annual maximum sea ice extent will decrease between 46 and 77% in accordance to earlier studies. However, in contrast to earlier results in the warmest scenario simulation one ice-free winter out of 96 seasons was found. Although wind speed changes are uniform, extreme sea levels may increase more than the mean sea level. In two out of four projections significant changes of 100-year surge heights were found.
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References
Andrejev O, Myrberg K, Lundberg PA (2004) Age and renewal time of water masses in a semi-enclosed basin—application to the Gulf of Finland. Tellus 56A:548–558
Baerens C, Hupfer P (1999) Extremwasserstände an der deutschen Ostseeküste nach Beobachtungen und in einem Treibhausgasszenario. Die Küste 61:47–72
Bolin B, Rodhe H (1973) A note on the concepts of age distribution and transit time in natural reservoirs. Tellus 25:58–62
Bumke K, Karger U, Hasse L, Niekamp K (1998) Evaporation over the Baltic Sea as an example of a semi-enclosed sea. Contr Atmos Phys 71:249–261
Christensen JH, Christensen OB (2003) Severe summertime flooding in Europe. Nature 421:805–806
Church JA, Gregory JM, Huybrechts P, Kuhn M, Lambeck K, Nhuan MT, Qin D, Woodworth PL (2001) Changes in sea level. In: Houghton JT, Ding Y, Griggs DJ, Noguer M, van der Linden PJ, Dai X, Maskell K, Johnson CA (eds) Climate change 2001: The scientific basis. Contribution of working group I to the third assessment report of the intergovernmental panel on climate change, chap 11. Cambridge University Press, Cambridge, United Kingdom and New York, NY, USA, pp 640–693
Deleersnijder E, Campin J-M, Delhez EJM (2001) The concept of age in marine modelling: I. Theory and preliminary results. J Mar Syst 28:229–267
Delhez EJM, Campin J-M, Hirst AC, Deleersnijder E (1999) Toward a general theory of the age in ocean modelling. Ocean Model 1:17–27
Döscher R, Meier HEM (2004) Simulated sea surface temperature and heat fluxes in different climates of the Baltic Sea. Ambio 33:242–248
Döscher R, Willén U, Jones C, Rutgersson A, Meier HEM, Hansson U, Graham LP (2002) The development of the regional coupled ocean-atmosphere model RCAO. Boreal Environ Res 7:183–192
Ekman M (1996) A consistent map of the postglacial uplift of Fennoscandia. Terra Nova 8:158–165
Ekman M, Mäkinen J (1996) Mean sea surface topography in the Baltic Sea and its transition area to the North Sea: a geodetic solution and comparison with oceanographic models. J Geophys Res 101:11993–11999
England MH (1995) The age of water and ventilation timescales in a global ocean model. J Phys Oceanogr 25:2756–2777
Engqvist A (1996) Long-term nutrient balances in the eutrophication of the Himmerfjärden estuary. Estuar Coast Shelf Sci 42:483–507
Fischer H, Matthäus W (1996) The importance of the Drogden Sill in the Sound for major Baltic inflows. J Mar Syst 9:137–157
Giorgi F, Mearns LO (1991) Approaches to the simulation of regional climate change: a review. Rev Geophys 292:191–216
Gordon C, Cooper C, Senior CA, Banks H, Gregory JM, Johns TC, Mitchell JFB, Wood RA (2000) The simulation of SST, sea ice extent and ocean heat transports in a version of the Hadley Centre coupled model without flux adjustments. Clim Dynam 16:147–166
Gornitz V (1995) Monitoring sea level changes. Climatic Change 31:515–544
Graham LP (1999) Modeling runoff to the Baltic Sea. Ambio 27:328–334
Graham LP (2004) Climate change effects on river flow to the Baltic Sea. Ambio 33:235–241
Gustafsson BG, Andersson HC (2001) Modeling the exchange of the Baltic Sea from the meridional atmospheric pressure difference across the North Sea. J Geophys Res 106:19731–19744
Haapala J, Meier HEM, Rinne J (2001) Numerical investigations of future ice conditions in the Baltic Sea. Ambio 30:237–244
Hagemann S, Machenhauer B, Jones R, Christensen OB, Déqué M, Jacob D, Vidale PL (2004) Evaluation of water and energy budgets in regional climate models applied over Europe. Clim Dynam 23:547–567
Hay LE, Wilby RL, Leavesley GH (2000) A comparison of delta change and downscaled GCM scenarios for three mountainous basins in the United States. J Am Water Res Assoc 36:387–398
HELCOM (2002) Fourth periodic assessment of the state of the environment of the Baltic marine area, 1994–1998. Baltic Sea Environment Proceedings No.82B, Baltic Marine Environment Protection Commision, Helsinki, Finland
Janssen F, Schrum C, Backhaus J (1999) A climatological dataset of temperature and salinity for the North Sea and the Baltic Sea. Deut Hydrogr Z Suppl 9:245
Johansson M, Kahma KK, Boman H, Launiainen J (2004) Scenarios for the sea level on the Finnish coast. Boreal Environ Res 9:153–166
Jones CG, Willén U, Ullerstig A, Hansson U (2004) The Rossby Centre Regional Atmospheric Climate Model part I: model climatology and performance for the present climate over Europe. Ambio 33:199–210
Kauker F, Langenberg H (2000) Two models for the climate change related development of sea levels in the North Sea. A comparison. Clim Res 15:61–67
Kauker F, Meier HEM (2003) Modeling decadal variability of the Baltic Sea: 1. Reconstructing atmospheric surface data for the period 1902–1998. J Geophys Res 108(C8):3267, doi:10.1029/2003JC001,797
Kjellström E (2004) Recent and future signatures of climate change in Europe. Ambio 33:193–198
Kont A, Jaagua J, Aunap R (2003) Climate change scenarios and the effect of sea-level rise for Estonia. Global Planet Change 36:1–15
Langenberg H, Pfizenmayer A, von Storch H, Sündermann J (1999) Storm-related sea level variations along the North Sea coast: natural variability and anthropogenic change. Cont Shelf Res 19:821–842
Lass H-U, Matthäus W (1996) On temporal wind variations forcing salt water inflows into the Baltic Sea. Tellus 48A:663–671
Lowe JA, Gregory JM, Flather RA (2001) Changes in the occurrence of storm surges around the United Kingdom under a future climate scenario using a dynamic storm surge model driven by the Hadley Centre climate models. Clim Dynam 18:179–188
MacKenzie BR, Köster FW (2004) Fish production and climate: sprat in the Baltic Sea. Ecology 85:784–794
Matthäus W, Franck H (1992) Characteristics of major Baltic inflows—a statistical analysis. Cont Shelf Res 12:1375–1400
Meier HEM (2002a) Regional ocean climate simulations with a 3D ice-ocean model for the Baltic Sea. Part 1: model experiments and results for temperature and salinity. Clim Dynam 19:237–253
Meier HEM (2002b) Regional ocean climate simulations with a 3D ice-ocean model for the Baltic Sea. Part 2: results for sea ice. Clim Dynam 19:255–266
Meier HEM (2005) Modeling the age of Baltic Sea water masses: quantification and steady state sensitivity experiments. J Geophys Res 110:C02,006, doi:10.1029/2004JC002,607
Meier HEM, Döscher R (2002) Simulated water and heat cycles of the Baltic Sea using a 3D coupled atmosphere-ice-ocean model. Boreal Environ Res 7:327–334
Meier HEM, Kauker F (2003a) Modeling decadal variability of the Baltic Sea: 2. Role of freshwater inflow and large-scale atmospheric circulation for salinity. J Geophys Res 108(C11):3368, doi: 10.1029/2003JC001,799
Meier HEM, Kauker F (2003b) Sensitivity of the Baltic Sea salinity to the freshwater supply. Clim Res 24:231–242
Meier HEM, Döscher R, Coward AC, Nycander J, Döös K (1999) RCO - Rossby Centre regional Ocean climate model: model description (version 1.0) and first results from the hindcast period 1992/93. Reports Oceanography 26, Swedish Meteorological and Hydrological Institute, SE-60176 Norrköping, Sweden, pp 102
Meier HEM, Döscher R, Faxén T (2003) A multiprocessor coupled ice-ocean model for the Baltic Sea: Application to salt inflow. J Geophys Res 108(C8):3273, doi: 10.1029/2000JC000,521
Meier HEM, Broman B, Kjellström E (2004a) Simulated sea level in past and future climates of the Baltic Sea. Clim Res 27:59–75
Meier HEM, Döscher R, Halkka A (2004b) Simulated distributions of Baltic sea-ice in warming climate and consequences for the winter habitat of the Baltic ringed seal. Ambio 33:249–256
Meier HEM, Broman B, Kallio H, Kjellström E (2006) Projections of future surface winds, sea levels, and wind waves in the late 21st century and their application for impact studies of flood prone areas in the Baltic Sea region. In: Schmidt-Thomé P (ed) Sea level changes affecting the spatial development of the Baltic Sea region. Geological Survey of Finland, Special Paper 41, Espoo, pp 23–43
Nakićenović N, Alcamo J, Davis G, de Vries B et al (2000) Emission scenarios. A special report of Working Group III of the Intergovernmental Panel on Climate Change, Cambridge University Press, pp 599
Omstedt A, Gustafsson B, Rodhe J, Walin G (2000) Use of Baltic Sea modelling to investigate the water cycle and the heat balance in GCM and regional climate models. Clim Res 15:95–108
Orviku K, Jaagus J, Kont A, Ratas U, Rivis R (2003) Increasing activity of coastal processes associated with climate change in Estonia. J Coastal Res 19:364–375
Pope VD, Gallani ML, Rowntree PR, Stratton RA (2000) The impact of new physical parameterizations in the Hadley Centre climate model: HADAM3. Clim Dynam 16:123–146
Räisänen J, Hansson U, Ullerstig A, Döscher R, Graham LP, Jones C, Meier HEM, Samuelsson P, Willén U (2003) GCM driven simulations of recent and future climate with the Rossby Centre coupled atmosphere - Baltic Sea regional climate model RCAO. Reports Meteorology and Climatology 101, Swedish Meteorological and Hydrological Institute, SE-60176 Norrköping, Sweden, pp 61
Räisänen J, Hansson U, Ullerstig A, Döscher R, Graham LP, Jones C, Meier HEM, Samuelsson P, Willén U (2004) European climate in the late 21st century: regional simulations with two driving global models and two forcing scenarios. Clim Dynam 22:13–31
Rodhe J, Winsor P (2002) On the influence of the freshwater supply on the Baltic Sea mean salinity. Tellus 54A:175–186
Rodhe J, Winsor P (2003) Corrigendum: on the influence of the freshwater supply on the Baltic Sea mean salinity. Tellus 55A:455–456
Roeckner E, Bengtsson L, Feichter J, Lelieveld J, Rodhe H (1999) Transient climate change simulations with a coupled atmosphere–ocean GCM including the tropospheric sulfur cycle. J Clim 12:3004–3032
Sausen R, Barthel K, Hasselmann K (1988) Coupled ocean-atmosphere models with flux correction. Clim Dynam 2:145–163
Schrum C (2001) Regionalization of climate change for the North Sea and Baltic Sea. Clim Res 18:31–37
SMHI, FIMR (1982) Climatological ice atlas for the Baltic Sea, Kattegat, Skagerrak and Lake Vänern (1963–1979). Tech Rep, Swedish Meteorological and Hydrological Institute and Finnish Institute of Marine Research, SE-60176 Norrköping, Sweden, pp 220
Stevens DP (1990) On open boundary conditions for three dimensional primitive equation ocean circulation models. Geophys Astrophys Fluid Dynam 51:103–133
Stigebrandt A, Gustafsson B (2003) Response of the Baltic Sea to climate change—theory and observations. J Sea Res 49:243–256
Tinz B (1996) On the relation between annual maximum extent of ice cover in the Baltic Sea level pressure as well as air temperature field. Geophysica 32:319–341
Voipio A (1981) The Baltic Sea. Elsevier, Amsterdam, pp 418
Wilks DS (1995) Statistical methods in the atmospheric sciences. Academic, London, pp 467
Winsor P, Rodhe J, Omstedt A (2001) Baltic Sea ocean climate: an analysis of 100 yr of hydrographic data with focus on the freshwater budget. Clim Res 18:5–15
Winsor P, Rodhe J, Omstedt A (2003) Erratum: Baltic Sea ocean climate: an analysis of 100 yr of hydrographical data with focus on the freshwater budget. Clim Res 25:183
Woth K, Weisse R, von Storch H (2005) Dynamical modeling of North Sea storm surge extremes under climate change conditions - an ensemble study. Report 2005/1, GKSS - Forschungszentrum Geesthacht GmbH, Geesthacht, pp 31
Acknowledgments
The support with computational resources by the Swedish National Infrastructure for Computing (SNIC) via grant SNIC 004/03-74 is gratefully acknowledged. I would like to thank Barry Broman (SMHI), Milla Johansson (FIMR), and Johannes Klein (GTK) for providing data of observed sea level extremes.
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Meier, H.E.M. Baltic Sea climate in the late twenty-first century: a dynamical downscaling approach using two global models and two emission scenarios. Clim Dyn 27, 39–68 (2006). https://doi.org/10.1007/s00382-006-0124-x
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DOI: https://doi.org/10.1007/s00382-006-0124-x