Tropical Pacific Ocean forcing of the 1998-99 decadal shift in global precipitation Lyon, Barnston, DeWitt, Climate Dynamics (revised)

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Presentation transcript:

Tropical Pacific Ocean forcing of the decadal shift in global precipitation Lyon, Barnston, DeWitt, Climate Dynamics (revised)

MAM 2011 PRCP Anomaly MAM AVG PRCP Anomaly East Africa MAM PRCP Anomaly

MAM Avg. SST Anomaly MAM Avg. PRCP, V850 Anomalies CMAP PRCP > 6 mm/day Red  Blue 

1 st EOF Loadings MAM PRCP PC1

Linearly remove ENSO and GW Signals from ERSST (and HAD SST):  Compute EOF of Residual Anomalies EOF1 Pacific Domain EOF1 Indo-Pacific Domain PCs and GW Trend

GPCC PRCP Difference: ( ) minus ( ) ( ) minus ( ) Statistically Significant Pooled PRCP Anomalies

EOF1 of R2 850hPa Wind for MAM As Above but for 20CR ( ) PCs

R2 Composite 200hPa Stationary Wave for MAM EOF1 of R2 200 hPa Stationary Waves for MAM PC1

Do Climate Model Simulations Capture the Recent Observed Patterns and the Shift? Use the ECHAM4.5 (captures climo, used in IRI fcsts)  Full Simulations  POGA Runs (with slab ocean model)

PRCP Anomalies: ( ) minus ( ) Full Simulation POGA

Model PRCP Leading EOFs Full Simulation POGA PCs

EOFs of Model 850 hPa Wind Field Full Simulation POGA PCs

Composite and EOF of Model 200 hPa Stationary Waves POGA Composite POGA EOF1 Loadings PC

Conclusions A climate shift akin to that of occurred in Shift is identified in multiple observational fields (PRCP, V850, SW200) ECHAM4.5 simulations and POGA runs capture the salient, observed features quite well POGA runs are able to capture observed features, indicting the fundamental role played by the tropical Pacific SSTs in generating teleconnections For East Africa, results strongly suggest that multidecadal variability in the Pacific is the main driver of the recent “long rains” decline Interesting that in MAM the Pacific has direct relationship to East Africa rainfall, vis-à-vis OND, when the progression is Pacific  Indian  East Africa. Why? What are the physical mechanisms that lead to the rainfall decline in East Africa? Are there additional factors leading to the severity of recent MAM droughts in EA? Climate Change  A wetter East Africa? What do the models get right (now)?