climate sensitivities of enso bridging theory, observations, and modeling
DESCRIPTION
Climate Sensitivities of ENSO Bridging theory, observations, and modeling. Andrew Wittenberg GFDL/NOAA, Princeton, New Jersey, USA. Thanks to: Gabriel Vecchi, Qian Song, and Anthony Rosati. “Other worlds” in CGCMs. Mixed layer temperature anomaly tendency equation. - PowerPoint PPT PresentationTRANSCRIPT
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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
![Page 2: Climate Sensitivities of ENSO Bridging theory, observations, and modeling](https://reader036.vdocuments.us/reader036/viewer/2022062314/56813b34550346895da402e2/html5/thumbnails/2.jpg)
“Other worlds” in CGCMs
![Page 3: Climate Sensitivities of ENSO Bridging theory, observations, and modeling](https://reader036.vdocuments.us/reader036/viewer/2022062314/56813b34550346895da402e2/html5/thumbnails/3.jpg)
Mixed layer temperature anomaly tendency equation
Key to understanding impact of background state on ENSO.
![Page 4: Climate Sensitivities of ENSO Bridging theory, observations, and modeling](https://reader036.vdocuments.us/reader036/viewer/2022062314/56813b34550346895da402e2/html5/thumbnails/4.jpg)
Mixed layer temperature anomaly tendency equation
Key to understanding impact of background state on ENSO.
![Page 5: Climate Sensitivities of ENSO Bridging theory, observations, and modeling](https://reader036.vdocuments.us/reader036/viewer/2022062314/56813b34550346895da402e2/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 west-Pacific 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 west-Pacific zonal stress from 10 AM2 runs
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Summary
1) CGCMs: “Other Worlds”
2) Mixed layer heat budget & “frequency 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 off-equatorial 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