THE MADDEN-JULIAN OSCILLATION AND CALIFORNIA RAINFALL

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THE MADDEN-JULIAN OSCILLATION AND CALIFORNIA
RAINFALL Charles Jones University of California
Santa Barbara
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The Madden-Julian Oscillation
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• Modulate the variability of the monsoons in
  Asia-Australia, Africa and Americas
• Teleconnections with extratropics in both
  hemispheres
• Modulate thermocline variability in the tropical
  Pacific Ocean
• Influence on forecast skills in the tropics and
  extratropics

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Outgoing Longwave Radiation Climatology
TC
TS
TC lt TS
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• MJO
• Pentads of OLR 1979-2002 (winter) Filtered 20-90
  days anomalies
• EOF of OLR anomalies
• Active MJO amplitudes of PC1 and PC2

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The Life Cycle of the MJO Convective Activity
Time
OLR Data are filtered in time (20-90 days) and
composites of OLR anomalies are made
Enhanced Convection
Suppressed Convection
Jones (2000)
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Zonal (U) wind component (850 hPa) is filtered in
time (20-90 days) and composites of anomalies are
made
Time
Enhanced Convection
Easterly anomalies
Westerly anomalies