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Decreased frequency of North Atlantic polar lows associated with future climate warming


Every winter, the high-latitude oceans are struck by severe storms that are considerably smaller than the weather-dominating synoptic depressions1. Accompanied by strong winds and heavy precipitation, these often explosively developing mesoscale cyclones—termed polar lows1—constitute a threat to offshore activities such as shipping or oil and gas exploitation. Yet owing to their small scale, polar lows are poorly represented in the observational and global reanalysis data2 often used for climatological investigations of atmospheric features and cannot be assessed in coarse-resolution global simulations of possible future climates. Here we show that in a future anthropogenically warmed climate, the frequency of polar lows is projected to decline. We used a series of regional climate model simulations to downscale a set of global climate change scenarios3 from the Intergovernmental Panel of Climate Change. In this process, we first simulated the formation of polar low systems in the North Atlantic and then counted the individual cases. A previous study4 using NCEP/NCAR re-analysis data5 revealed that polar low frequency from 1948 to 2005 did not systematically change. Now, in projections for the end of the twenty-first century, we found a significantly lower number of polar lows and a northward shift of their mean genesis region in response to elevated atmospheric greenhouse gas concentration. This change can be related to changes in the North Atlantic sea surface temperature and mid-troposphere temperature; the latter is found to rise faster than the former so that the resulting stability is increased, hindering the formation or intensification of polar lows. Our results provide a rare example of a climate change effect in which a type of extreme weather is likely to decrease, rather than increase.

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Figure 1: Number of polar lows per polar low season and the seasonal cycle.
Figure 2: Projected changes in polar low frequency and vertical atmospheric stability.
Figure 3: Polar low density distribution.


  1. Rasmussen, E. A. & Turner, J. Polar Lows: Mesoscale Weather Systems in the Polar Regions (Cambridge Univ. Press, 2003)

    Book  Google Scholar 

  2. Condron, A., Bigg, G. R. & Renfrew, I. A. Polar mesoscale cyclones in the northeast Atlantic: comparing climatologies from ERA-40 and satellite imagery. Mon. Weath. Rev. 134, 1518–1533 (2006)

    ADS  Article  Google Scholar 

  3. Nakicenovic, N. & Swart, R. IPCC Special Report on Emissions Scenarios (Cambridge Univ. Press, 2000)

    Google Scholar 

  4. Zahn, M. & von Storch, H. A long-term climatology of North Atlantic polar lows. Geophys. Res. Lett. 35, L22702 (2008)

    ADS  Article  Google Scholar 

  5. Kalnay, E. et al. The NCEP/NCAR 40-year reanalysis project. Bull. Am. Meteorol. Soc. 77, 437–471 (1996)

    ADS  Article  Google Scholar 

  6. Harrold, T. W. & Browning, K. A. The polar low as a baroclinic disturbance. Q. J. R. Meteorol. Soc. 95, 710–723 (1969)

    ADS  Article  Google Scholar 

  7. Klein, T. & Heinemann, G. Interaction of katabatic winds and mesocyclones near the eastern coast of Greenland. Meteorol. Appl. 9, 407–422 (2002)

    ADS  Article  Google Scholar 

  8. Emanuel, K. A. & Rotunno, R. Polar lows as arctic hurricanes. Tellus A 41, 1–17 (1989)

    ADS  Article  Google Scholar 

  9. Rasmussen, E. A. The polar low as an extratropical CISK disturbance. Q. J. R. Meteorol. Soc. 105, 531–549 (1979)

    ADS  Article  Google Scholar 

  10. Condron, A., Bigg, G. R. & Renfrew, I. A. Modeling the impact of polar mesocyclones on ocean circulation. J. Geophys. Res. 113 10.1029/2007JC004599 (2008)

  11. Trapp, R. J. et al. Changes in severe thunderstorm environment frequency during the 21st century caused by anthropogenically enhanced global radiative forcing. Proc. Natl Acad. Sci. USA 104, 19719–19723 (2007)

    CAS  ADS  Article  Google Scholar 

  12. Kolstad, E. W. & Bracegirdle, T. J. Marine cold-air outbreaks in the future: an assessment of IPCC AR4 model results for the Northern Hemisphere. Clim. Dyn. 30, 871–885 (2008)

    Article  Google Scholar 

  13. Vavrus, S., Walsh, J. E., Chapman, W. L. & Portis, D. The behavior of extreme cold air outbreaks under greenhouse warming. Int. J. Climatol. 26, 1133–1147 (2006)

    Article  Google Scholar 

  14. Wilhelmsen, K. Climatological study of gale-producing polar lows near Norway. Tellus A 37, 451–459 (1985)

    ADS  Article  Google Scholar 

  15. Blechschmidt, A.-M. A 2-year climatology of polar low events over the Nordic seas from satellite remote sensing. Geophys. Res. Lett. 35, L09815 (2008)

    ADS  Article  Google Scholar 

  16. Bracegirdle, T. & Gray, S. An objective climatology of the dynamical forcing of polar lows in the Nordic seas. Int. J. Climatol. 28, 1903–1919 (2008)

    Article  Google Scholar 

  17. Roeckner, E. et al. The atmospheric general circulation model ECHAM 5. Part I: Model description. MPI report 349 〈〉 (Max-Planck Institute, 2003)

  18. Marsland, S. J., Haak, H., Jungclaus, J. H., Latif, M. & Röske, F. The Max-Planck-Institute global ocean/sea ice model with orthogonal curvilinear coordinates. Ocean Model. 5, 91–127 (2003)

    ADS  Article  Google Scholar 

  19. Meehl, G. A. et al. in Climate Change 2007: The Physical Science Basis (eds Solomon, S. et al.) 747–845 (Cambridge Univ. Press, 2007)

    Google Scholar 

  20. Christensen, J. H. et al. in Climate Change 2007: The Physical Science Basis (eds Solomon, S. et al.) 847–940 (Cambridge Univ. Press, 2007)

    Google Scholar 

  21. Jun, M., Knutti, R. & Nychka, D. W. Spatial analysis to quantify numerical model bias and dependence. J. Am. Stat. Assoc. 103, 934–947 (2008)

    CAS  Article  Google Scholar 

  22. Levitus, S., Antonov, J., Boyer, T. P. & Stephens, C. Warming of the world ocean. Science 287, 2225–2229 (2000)

    CAS  ADS  Article  Google Scholar 

  23. Levitus, S., Antonov, J. & Boyer, T. Warming of the world ocean, 1955– 2003. Geophys. Res. Lett. 32, L02604 (2005)

    ADS  Google Scholar 

  24. Bindoff, N. L. et al. in Climate Change 2007: The Physical Science Basis (eds Solomon, S. et al.) 385–428 (Cambridge Univ. Press, 2007)

    Google Scholar 

  25. Heinemann, G. On the development of wintertime meso-scale cyclones near the sea ice front in the Arctic and Antarctic. Glob. Atmos.-Ocean Syst. 4, 89–123 (1996)

    Google Scholar 

  26. Bengtsson, L., Hodges, K. I. & Roeckner, E. Storm tracks and climate change. J. Clim. 19, 3518–3543 (2006)

    ADS  Article  Google Scholar 

  27. Rockel, B., Will, A. & Hense, A. The regional climate model COSMO-CLM (CCLM). Meteorol. Z. 17, 347–348 (2008)

    Article  Google Scholar 

  28. Feser, F. & von Storch, H. A spatial two-dimensional discrete filter for limited-area-model evaluation purposes. Mon. Weath. Rev. 133, 1774–1786 (2005)

    ADS  Article  Google Scholar 

  29. Zahn, M. & von Storch, H. Tracking polar lows in CLM. Meteorol. Z. 17, 445–453 (2008)

    Article  Google Scholar 

  30. Zahn, M., von Storch, H. & Bakan, S. Climate mode simulation of North Atlantic polar lows in a limited area model. Tellus A 60, 620–631 (2008)

    ADS  Article  Google Scholar 

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We thank the Max Planck Institute for Meteorology in Germany for providing access to their ECHAM5/MPI-OM climate change simulations. We acknowledge the modelling groups for making their model output available for analysis, the Program for Climate Model Diagnosis and Intercomparison (PCMDI) for collecting and archiving this data, and the WCRP’s Working Group on Coupled Modelling (WGCM) for organizing the model data analysis activity. The WCRP CMIP3 multi-model data set is supported by the Office of Science, US Department of Energy. M.Z. was funded by the DFG within the special research project 512 and thanks B. Rockel, E. Zorita and K. Hodges for their help. H.v.S. was partially supported by the International Detection and Attribution Group (IDAG), funded by the DoE, and thanks H. Hinzpeter for directing his attention to the phenomenon of polar lows in the early 1980s.

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Both authors contributed to developing the ideas presented. M.Z. did the technical work for this study.

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Correspondence to Matthias Zahn.

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The authors declare no competing financial interests.

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This file contains Supplementary Methods, Supplementary Table 1, Supplementary Analysis, Supplementary Figures 1- 4 with legends and additional references. (PDF 1979 kb)

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Zahn, M., von Storch, H. Decreased frequency of North Atlantic polar lows associated with future climate warming. Nature 467, 309–312 (2010).

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