• Education

• Professional Experience

• Other Commitments

• Publications

Research

My research interest is focused on the Baltic Sea ocean climate system and the mechanisms of climate change. Monitoring of climate related parameters has been carried out in the Baltic Sea region over the past several hundred years (at least since the mid 18th century), and continues still today. Long instrumental series make the region particularly interesting for studies on climate change, climate sensitivity and climate variability. Using these series in combination with historical data and numerical modelling, I try to increase our knowledge of how salinity, temperature, ice extent and riverine freshwater discharge have varied through history, and how they will respond to a changing climate. Some key problems my research encompass are:

• Is the present climate in the region outside its natural borders of the past several hundred years?
• How large is the internal variability of the climate system in the region?
• What climate change can we attribute to anthropogenic effects?
• How will the heat balance of the Baltic Sea change?
• How much have the climate changed over the last 500 years?
• Was there a Little Ice Age in the Baltic Sea region?
• How will the ice extent change in the future?
• Has the Baltic Sea been covered with ice every winter over the past 500 years?
• Will a changing climate induce a fresher or saltier Baltic Sea?
• How has the riverine freshwater discharge changed over the past several hundred years and how is it linked to climate change?

Education:

M.Sc in Environmental Science with Specialisation in Problem Solving, Göteborg University, Sweden, 2003.

Professional experience:

Intern at the county administration of Västra Götaland, Environmental protection department, 2004.

Assistant teacher at the department of Oceanography, Göteborg University, 2005-present

Other Commitments:

Scientific advisor for Forum Östersjön, Vamlingbo

Member of the board for the Department of Earth Sciences, Göteborg University, 2004-2006
Webmaster of the Ocean Climate Group's webpage, 2005-2009
Member of the Local Organizing Committee for the BALTEX meeting in Göteborg, 2006.
Member of the Local Webpage Committee at the Earth Sciences Centre, Göteborg University, 2007

Publications:

Papers

• Hansson, D. and A., Omstedt, (2008).
  Modelling the Baltic Sea ocean climate on centennial time scale; temperature and sea ice. Climate Dynamics 30, 763-778. DOI 10.1007/s00382-007-0321-2
• Omstedt, A. and D., Hansson, (2006).
  Erratum to: 'The Baltic Sea ocean climate system memory and response to changes in the water and heat balance components'. Continental Shelf Research 26, 1685-1687. DOI 10.1016/j.csr.2006.05.011
• Omstedt, A. and D., Hansson, (2006).
  The Baltic Sea ocean climate system memory andresponse to changes in the water and heat balance components. Continental Shelf Research 26, 236-251. DOI 10.1016/j.csr.2005.11.003

Manuscripts submitted

• Hansson, D., Eriksson, C., Omstedt, A., and D., Chen. Reconstruction of river runoff to the Baltic Sea, AD 1500–1995
• Hansson, D. and E., Gustafsson. Salinity and oxygen conditions in the Baltic Sea since 1500

Manuscripts in preparation

• Hansson, D. and J., Söderberg. Evaluation of the Uppsala temperature record

Reports

• Hansson, D., (2009).
  Ocean climate variability over recent centuries explored by modelling the Baltic Sea, Ph.D thesis, Oceanography, University of Gothenburg, Gothenburg , Sweden.
• Hansson, D., (2003).
  Stratosfärisk ozonuttunning, molnighet samt vertikal vattenomblandning och dess påverkan på antarktiska fytoplanktons fotosyntes, M.Sc Thesis, Problem Solving in Science, University of Gothenburg, Gothenburg, Sweden.

Popular articles

• Hansson, D., C., Eriksson and A., Omstedt, (2007). Klimatförändringar under femhundra år. Havet 2007 - om miljötillståndet i våra havsområden, pp 22-24. ISBN 978-91-620-1262-5, Download from havet.nu
• Hansson, D., C., Eriksson and A., Omstedt, (2007). Is i ett föränderligt klimat – framtidens svar finns i historien. Havsmiljön, December 2007.
• Hansson, D., C., Ericsson and A., Omstedt, (2007). Kommer isen försvinna i Östersjön? Göteborgs långfärdskridskoklubbs årsbok 2007.
• Eriksson, C., D., Hansson, A., Omstedt and D., Chen (2007).
  Reconstruction of river runoff to the Baltic Sea for the period 1500–1995. GEWEX Newsletter, Vol 17, No 3.
• Hansson, D. (2007).
  Da svenskerne gik over isen til Danmark. Berlingske Tidende, 28 January [pdf]

Abstracts to conferences

• Schenk, F., Hansson, D., Wagner, S. & E., Zorita.
  Non-Stationarities in the circulation-climate-relationship over the Baltic Sea and its effects on reconstructions of climate indices [oral] Climate Change: The environmental and socio-economic response in the southern Baltic region, Szczecin, Poland, May 25-28 May, 2009.
• Schenk, F., Hansson, D., Wagner, S. & E., Zorita.
  Non-stationarity in the NAO-temperature relation over the Baltic Sea catchment [poster] European Geophysical Union General Assembly, Vienna, Austria, April 19-24, 2009.
• Schenk, F., Blümel, W.D., Zorita, E., Wagner, S. & D., Hansson.
  The North Atlantic Oscillation since 1500 A.D. - Climate Anomalies & Human Affairs. [poster] American Geophysical Union General Assembly, San Fransisco, California, December 15-19, 2008.
• Hansson, D. & Gustafsson, E.
  Stagnation periods in the Baltic Sea since 1500 [poster] European Geophysical Union General Assembly, Vienna, Austria, April 13-18, 2008.
• Hansson, D. & Söderberg, J.
  Is there a warm bias in the late winter and early spring Uppsala air temperature, 1722 – 1750? [poster] European Geophysical Union General Assembly, Vienna, Austria, April 13-18, 2008.
• Hansson, D. & A., Omstedt.
  Modelling the Baltic Sea ocean climate on centennial time scale; temperature and sea ice, [oral] 5th study conference on BALTEX, Kuressaare, Estonia, June 4-8, 2007.
• Eriksson, C., D., Hansson, A., Omstedt & C., Chen
  Reconstructing the past 500 years of river runoff to the Baltic Sea, [poster] European Geophysical Union General Assembly, Vienna, Austria, April 15-20, 2007.
• Hansson, D. & A., Omstedt.
  Modelling the Baltic Sea ocean climate on centennial time scale; temperature and sea ice, [poster] European Geophysical Union General Assembly, Vienna, Austria, April 15-20, 2007.
• Hansson, D. & A., Omstedt.
  Modelling the Baltic Sea ocean climate on centennial time scale; temperature and sea ice, [poster] Nordic Marine Science Conference, Oslo, Norway, November 1-3, 2006.
• Hansson, D. & A., Omstedt.
  The Baltic Sea ocean climate system memory and response to changes in the heat and water balance components, [oral] 5th Baltic Sea Science Congress, Sopot, Poland, June 20-24, 2005.

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