Climate variability in central equatorial Africa: Influence from the Atlantic sector

  • Todd M
  • Washington R
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Abstract

{[} 1] We document a strong teleconnection between Central Equatorial
African (CEA) rainfall ( and Congo River discharge) and the large-scale
circulation over the North Atlantic, throughout the boreal winter/spring
season. Positive rainfall anomalies over CEA ( at interannual and
multiannual timescales) are related to anomalous westerly
midtropospheric zonal winds over the CEA/Atlantic region. These
anomalies appear to be part of a coherent structure of zonal wind
anomalies extending to the polar regions of the North Atlantic, similar
to that associated with the NAO pattern. Idealised model simulations
suggest that at least over the tropical and subtropical latitudes of the
Atlantic/African sector such a signal may be associated with SST forcing
from the Tropical North Atlantic (TNA) region. We conclude that TNA SSTs
may force these circulation anomalies over CEA at multi-annual
timescales but at interannual timescales they may be relatively
independent of TNA SSTs.

Author-supplied keywords

  • 1833 Hydrology: Hydroclimatology
  • 3309 Meteorology and Atmospheric Dynamics: Climatology (1620)
  • 3339 Meteorology and Atmospheric Dynamics: Ocean/atmosphere interactions (0312, 4504)
  • 9305 Information Related to Geographic Region: Africa

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Authors

  • Martin C. Todd

  • Richard Washington

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