A recent and abrupt decline in the East African long rains

Details A recent and abrupt decline in the East African long rains A recent and abrupt decline in the East African long rains

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012georl..3902702l&link_type=abstract

Geophysical Research Letters, Volume 39, Issue 2, CiteID L02702

Physics

Global Change: Abrupt/Rapid Climate Change (4901, 8408), Global Change: Climate Variability (1635, 3305, 3309, 4215, 4513), Global Change: Climate Dynamics (0429, 3309), Global Change: Global Climate Models (3337, 4928), Global Change: Regional Climate Change (4321)

Scientific paper

The successive failure of the East African short rains (typically October-December) and subsequent long rains (March-May) in 2010-11 plunged much of the region into severe drought, impacting millions of people and triggering a humanitarian crisis. While poor short rains in 2010 were generally anticipated given linkages with La Niña, the subsequent long rains do not exhibit similar predictability. Here we show the long rains failure in boreal spring of 2011 is consistent with a recurrent large-scale precipitation pattern that followed their abrupt decline around 1999. Using observations and climate model simulations, we show the abrupt decline in long rains precipitation is linked to similarly abrupt changes in sea surface temperatures, predominately in the tropical Pacific basin.

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