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Daily MJO Index

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MJO

• Combined EOFs of u850, u200, and OLR

• Averaged over 15oS–15oN

• 01Jan1999–31Dec2014, daily data

• NOAA Interpolated OLR, 1999–2013

• CFSR for u850 and u200

• CFSR for OLR, 2014

• Anomaly w.r.t daily climatology

• 20–100-day band-pass filter prior to EOF

OLR U850 U200

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PC1

P C 2 Weak

MJO

Daily MJO Index

Normalized PCs

Weak MJO: (PC1

2

+ PC2

2

)

1/2

< 1

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Weekly MJO Index

• Normalized

• 8 phases

• May – December

• 34 weeks (Sunday – Saturday)

P C 2

Weak

MJO Phase 1

Phase 2 Phase 3

Phase 4 Phase 5 Phase 6

Phase 7

Phase 8

PC1

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