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Climate Changes in the Atlantic Can Affect Drought in Distant Regions

ScienceDaily (June 16, 2010)

Climate Changes in the Atlantic Can Affect Drought in Distant Regions

ScienceDaily (June 16, 2010)

Cyclical changes in atmospheric pressure and sea surface temperature in the North Atlantic Ocean affect drought in the Sahel region on the southern Sahara rim. This has been revealed in an international study carried out by researchers from the University of Haifa, the French National Meteorological Service, Columbia University and the University of San Diego. The study was published recently in the scientific journal Atmospheric Science Letters.

That climate variability in one region can have an effect on more distant areas is known in the climate research literature — the challenge being to locate these far-connections and understand their projections. The current study, co-authored by Dr. Shlomit Paz of the Department of Geography and Environmental Studies at the University of Haifa, analyzed a number of climate parameters in the North Atlantic over the 20th century, including atmospheric pressure at sea level and sea surface temperature. They revealed two "natural climate signals" : a multi-decadal signal of a period exceeding 40 years, and a quasi-decadal signal with periodicity ranging from 8 to 14 years. These two signals may cancel or enhance one another.

Pour en savoir plus (ScienceDaily)

Page publiée le 18 novembre 2011, mise à jour le 4 août 2014