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Changes in Present and Future Circulation Types Frequency in Northwest Iberian Peninsula

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  • María N Lorenzo
  • Alexandre M Ramos
  • Juan J Taboada
  • Luis Gimeno

Abstract

The aim of the work described herein was to study projection scenarios in order to find changes in the synoptic variability of the northwest Iberian Peninsula in the 21st century. To this end, we investigated the changes in the frequency of the different circulation types computed for the study area using three different models used in the IPCC 4th assessment report. The circulation types were computed using the procedure known as Lamb circulation types. The control simulation for the late 20th century was evaluated objectively from the results obtained using data from the NCEP/NCAR reanalysis, as to evaluate the ability of the model to reproduce the present climate. We have compared not only seasonal mean sea level pressure fields but also the mean seasonal frequency of circulation types. The results for the end of the 21st century show a decrease in the frequency of cyclonic, W, and SW circulation types in the spring and summer months. This trend also appears in the autumn, with a concomitant increase in the anticyclonic types.

Suggested Citation

  • María N Lorenzo & Alexandre M Ramos & Juan J Taboada & Luis Gimeno, 2011. "Changes in Present and Future Circulation Types Frequency in Northwest Iberian Peninsula," PLOS ONE, Public Library of Science, vol. 6(1), pages 1-9, January.
    • Handle: RePEc:plo:pone00:0016201
    DOI: 10.1371/journal.pone.0016201
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    1. Joao Santos & Solange Leite, 2009. "Long-term variability of the temperature time series recorded in Lisbon," Journal of Applied Statistics, Taylor & Francis Journals, vol. 36(3), pages 323-337.
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