Relationships Between Tropical Ascent and High Cloud Fraction Changes With Warming Revealed by Perturbation Physics Experiments in CAM5
Abstract Tropical ascent area (Aa) and high cloud fraction (HCF) are projected to decrease with surface warming in most Coupled Model Intercomparison Project Phase 5 (CMIP5) models. Perturbing deep convective parameters in the Community Atmosphere Model (CAM5) results in a similar spread and correla...
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| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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Wiley
2019-08-01
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| Series: | Geophysical Research Letters |
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| Online Access: | https://doi.org/10.1029/2019GL083026 |
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| author | Kathleen A. Schiro Hui Su Yuan Wang Baird Langenbrunner Jonathan H. Jiang J. David Neelin |
| author_facet | Kathleen A. Schiro Hui Su Yuan Wang Baird Langenbrunner Jonathan H. Jiang J. David Neelin |
| author_sort | Kathleen A. Schiro |
| collection | DOAJ |
| description | Abstract Tropical ascent area (Aa) and high cloud fraction (HCF) are projected to decrease with surface warming in most Coupled Model Intercomparison Project Phase 5 (CMIP5) models. Perturbing deep convective parameters in the Community Atmosphere Model (CAM5) results in a similar spread and correlation between HCF and Aa responses to interannual warming compared to the CMIP5 ensemble, with a narrower Aa corresponding to greater HCF reduction. Perturbing cloud physics parameters produces a comparatively smaller range of Aa responses to warming and a dissimilar HCF‐Aa relation to that in CMIP5; a narrower Aa corresponds to less HCF reduction, likely due to cloud radiative effects. A narrowing of Aa corresponds to a regime shift toward stronger precipitation in both experiments. We infer that model differences in deep convection parameterization likely play a greater role than differing cloud physics in determining the diverse responses of Aa and HCF to warming in CMIP5. |
| format | Article |
| id | doaj-art-fa99479ede4b423ea6c846b4a040385f |
| institution | DOAJ |
| issn | 0094-8276 1944-8007 |
| language | English |
| publishDate | 2019-08-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geophysical Research Letters |
| spelling | doaj-art-fa99479ede4b423ea6c846b4a040385f2025-08-20T03:14:54ZengWileyGeophysical Research Letters0094-82761944-80072019-08-014616101121012110.1029/2019GL083026Relationships Between Tropical Ascent and High Cloud Fraction Changes With Warming Revealed by Perturbation Physics Experiments in CAM5Kathleen A. Schiro0Hui Su1Yuan Wang2Baird Langenbrunner3Jonathan H. Jiang4J. David Neelin5Jet Propulsion Laboratory California Institute of Technology Pasadena CA USAJet Propulsion Laboratory California Institute of Technology Pasadena CA USAJet Propulsion Laboratory California Institute of Technology Pasadena CA USADepartment of Earth System Science University of California Irvine CA USAJet Propulsion Laboratory California Institute of Technology Pasadena CA USADepartment of Atmospheric and Oceanic Sciences University of California Los Angeles CA USAAbstract Tropical ascent area (Aa) and high cloud fraction (HCF) are projected to decrease with surface warming in most Coupled Model Intercomparison Project Phase 5 (CMIP5) models. Perturbing deep convective parameters in the Community Atmosphere Model (CAM5) results in a similar spread and correlation between HCF and Aa responses to interannual warming compared to the CMIP5 ensemble, with a narrower Aa corresponding to greater HCF reduction. Perturbing cloud physics parameters produces a comparatively smaller range of Aa responses to warming and a dissimilar HCF‐Aa relation to that in CMIP5; a narrower Aa corresponds to less HCF reduction, likely due to cloud radiative effects. A narrowing of Aa corresponds to a regime shift toward stronger precipitation in both experiments. We infer that model differences in deep convection parameterization likely play a greater role than differing cloud physics in determining the diverse responses of Aa and HCF to warming in CMIP5.https://doi.org/10.1029/2019GL083026tropical circulationmoist convectioncloud microphysicsdeep convection parameterizationcloud feedbacks |
| spellingShingle | Kathleen A. Schiro Hui Su Yuan Wang Baird Langenbrunner Jonathan H. Jiang J. David Neelin Relationships Between Tropical Ascent and High Cloud Fraction Changes With Warming Revealed by Perturbation Physics Experiments in CAM5 Geophysical Research Letters tropical circulation moist convection cloud microphysics deep convection parameterization cloud feedbacks |
| title | Relationships Between Tropical Ascent and High Cloud Fraction Changes With Warming Revealed by Perturbation Physics Experiments in CAM5 |
| title_full | Relationships Between Tropical Ascent and High Cloud Fraction Changes With Warming Revealed by Perturbation Physics Experiments in CAM5 |
| title_fullStr | Relationships Between Tropical Ascent and High Cloud Fraction Changes With Warming Revealed by Perturbation Physics Experiments in CAM5 |
| title_full_unstemmed | Relationships Between Tropical Ascent and High Cloud Fraction Changes With Warming Revealed by Perturbation Physics Experiments in CAM5 |
| title_short | Relationships Between Tropical Ascent and High Cloud Fraction Changes With Warming Revealed by Perturbation Physics Experiments in CAM5 |
| title_sort | relationships between tropical ascent and high cloud fraction changes with warming revealed by perturbation physics experiments in cam5 |
| topic | tropical circulation moist convection cloud microphysics deep convection parameterization cloud feedbacks |
| url | https://doi.org/10.1029/2019GL083026 |
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