andrew wittenberg - gfdl extranetatw/yr/2005/clim_enso.pdf · 3.1 yr 3.3yr wmtp flux tx=o.1 barie...
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![Page 1: Andrew Wittenberg - GFDL Extranetatw/yr/2005/clim_enso.pdf · 3.1 yr 3.3yr wmtp flux Tx=O.1 barie 5.5yr wmtp wptm *mtp flux 140t 1800 100'W ... -10 -20 IOO NIT F Precip (mm/day/C)](https://reader034.vdocuments.net/reader034/viewer/2022042414/5f2e886d5de6cf41d51334f9/html5/thumbnails/1.jpg)
Climate Sensitivities of ENSO
Bridging theory, observations, and modeling
Andrew WittenbergGFDL/NOAA, Princeton, New Jersey, USA
Thanks to: Gabriel Vecchi, Qian Song, and Anthony Rosati
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“Other worlds” in CGCMs
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Mixed layer temperature anomaly tendency equation
Key to understanding impact of background state on ENSO.
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Mixed layer temperature anomaly tendency equation
Key to understanding impact of background state on ENSO.
![Page 5: Andrew Wittenberg - GFDL Extranetatw/yr/2005/clim_enso.pdf · 3.1 yr 3.3yr wmtp flux Tx=O.1 barie 5.5yr wmtp wptm *mtp flux 140t 1800 100'W ... -10 -20 IOO NIT F Precip (mm/day/C)](https://reader034.vdocuments.net/reader034/viewer/2022042414/5f2e886d5de6cf41d51334f9/html5/thumbnails/5.jpg)
ICM Control Run
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ICM: Impact of trade wind strength
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Blocking the Indonesian Throughflow:
Change in mean SST (degC)
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Blocking the Indonesian Throughflow:
Anomaly patterns (regressed on NINO3)
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Observed SST forcing
Stochastic forcing: A role for the Indian Ocean
Daily westPacific zonal stress from 10 AM2 runs
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Observed SST forcing Warm East Indian
Stochastic forcing: A role for the Indian Ocean
Daily westPacific zonal stress from 10 AM2 runs
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Summary
1) CGCMs: “Other Worlds”
2) Mixed layer heat budget & “f requency budget”
3) ICM: perturbations seed feedbacks, which alter ENSO
4) CM2: flux anomaly patterns sensitive to background
5) WWBs, nonlinearity, and a role for the Indian Ocean
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CM2 greenhouse response
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Equatorial adjustment to offequatorial stress
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ICM: Different climate perturbations, similar effects
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CM2 anomaly patterns: Wind stress
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CM2 anomaly patterns: Surface heat flux
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A wide variety of products
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ICM: Mixed layer heat budget
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Hybrid CGCM mixed layer heat budget
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Impact of weakening equatorial zonal stress