The dynamics of cyclones in the twentyfirst century: the Eastern Mediterranean as an example

  • Assaf HochmanEmail author
  • Pinhas Alpert
  • Pavel Kunin
  • Dorita Rostkier-Edelstein
  • Tzvi Harpaz
  • Hadas Saaroni
  • Gabriele Messori


The Mediterranean region is projected to be significantly affected by climate change through warming and drying. The Eastern Mediterranean (EM) is particularly vulnerable since the bulk of the precipitation in the region is associated with a specific circulation pattern, known as Cyprus Low (CL). Here, we study the influence of increased greenhouse gases on the average properties and dynamics of CLs, using a regional semi-objective synoptic classification. The classification is applied to NCEP/NCAR reanalysis data for the present day (1986–2005) as well as to eight CMIP5 models for the present day and for the end of the century (2081–2100; RCP8.5). This is complemented by a dynamical systems analysis, which is used to investigate changes in the dynamics and intrinsic predictability of the CLs. Finally, a statistical downscaling algorithm, based on past analogues, is applied to eighteen rain stations over Israel, and is used to project precipitation changes associated with CLs. Significant changes in CL properties are found under climate change. The models project an increase in CL meridional pressure gradient (0.5–1.5 hPa/1000 km), which results primarily from a strong increase in the pressure over the southern part of the study region. Our results further point to a decrease in CL frequency (− 35%, as already noted in an earlier study) and persistence (− 8%). Furthermore, the daily precipitation associated with CL occurrences over Israel for 2081–2100 is projected to significantly reduce (− 26%). The projected drying over the EM can be partitioned between a decrease in CL frequency (~ 137 mm year−1) and a reduction in CL-driven daily precipitation (~ 67 mm year−1). The models further indicate that CLs will be less predictable in the future.


Cyprus low Cyclone predictability Climate change Cyclone dynamics Synoptic classification Dynamical systems Statistical downscaling Daily precipitation 



We thank Tel-Aviv University’s President and the Mintz foundation. This study was also partially supported by cooperation within the international virtual institute DESERVE (Dead Sea Research Venue), funded by the German Helmholtz Association, the Israel Science Foundation (ISF Grant no. 1123/17) and the Water Authority of Israel. G. Messori was partly supported by a grant from the Department of Meteorology of Stockholm University and by the Swedish Research Council Vetenskapsrådet, under Grant no. 2016-03724. This paper is a contribution to the Hydrological Cycle in the Mediterranean Experiment (HyMeX) community.

Supplementary material

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Supplementary material 1 (DOCX 292 kb)


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Authors and Affiliations

  1. 1.Department of Tropospheric Research, Institute of Meteorology and Climate ResearchKarlsruhe Institute of TechnologyEggenstein-LeopoldshafenGermany
  2. 2.Department of Geophysics, Porter School of the Environment and Earth SciencesTel-Aviv UniversityTel-AvivIsrael
  3. 3.Department of Applied Mathematics, Environmental Sciences DivisionIsrael Institute for Biological ResearchNess-ZionaIsrael
  4. 4.Department of Geography and the Human–Environment, Porter School of the Environment and Earth SciencesTel-Aviv UniversityTel-AvivIsrael
  5. 5.Department of Earth SciencesUppsala UniversityUppsalaSweden
  6. 6.Department of Meteorology and Bolin Centre for Climate ResearchStockholm UniversityStockholmSweden

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