1. 1 THE MADDEN-JULIAN OSCILLATION AND CALIFORNIA RAINFALL Charles Jones University of California Santa Barbara

2. 2 The Madden-Julian Oscillation Madden and Julian (1972)

3. 3

4. 4 * Significant case-to-case variability

5. 5  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

6. 6 Outgoing Longwave Radiation Climatology TCTC TSTS T C < T S

7. 7 MJO  Pentads of OLR 1979-2002 (winter) Filtered 20-90 days anomalies  EOF of OLR anomalies  Active MJO: amplitudes of PC1 and PC2

8. 8 The Life Cycle of the MJO: Convective Activity Jones (2000) Enhanced Convection Suppressed Convection OLR Data are filtered in time (20-90 days) and composites of OLR anomalies are made Time

9. 9 Zonal (U) wind component (850 hPa) is filtered in time (20-90 days) and composites of anomalies are made Westerly anomalies Easterly anomalies Enhanced Convection Time