A High-Latitude Convective Cloud Feedback and Equable Climates

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A High-Latitude Convective Cloud Feedback and Equable Climates

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dc.contributor.author Abbot, Dorian S.
dc.contributor.author Tziperman, Eli
dc.date.accessioned 2009-12-14T17:56:43Z
dc.date.issued 2008
dc.identifier.citation Abbot, Dorian S., and Eli Tziperman. 2008. A high latitude convective cloud feedback and equable climates. Quarterly Journal of the Royal Meteorological Society 134(630): 165-185. en_US
dc.identifier.issn 0035-9009 en_US
dc.identifier.uri http://nrs.harvard.edu/urn-3:HUL.InstRepos:3444550
dc.description.abstract A convective cloud feedback on extratropical surface temperatures is identified in a zonally averaged two-level atmospheric model. The model contains simplified parametrizations for convection, precipitation, and clouds, and a long-wave radiation scheme that explicitly depends on carbon dioxide, water vapour, and cloud fraction. The convective cloud feedback occurs if the extratropical surface temperature is increased enough to initiate strong atmospheric convection. This results in a change from low to high clouds and from negative to neutral or positive cloud radiative forcing, which further warms the surface and leads to more convection. This positive feedback activates as the CO2 concentration is increased and leads to a climate solution with high boundary-layer temperatures, convection at mid and high latitudes, and an Equator to Pole temperature difference that is reduced by 8-10 °C. The reduction in Equator to Pole temperature difference is due to changes in high-latitude local heat balance and occurs despite decreased meridional heat transport. The convective cloud feedback also leads to multiple equilibria and hysteresis with respect to CO2 and other model variables, although these results may be due to the simplicity of the model. The possible connection of the behaviour of the model at high CO2 with equable climates is considered. en_US
dc.description.sponsorship Earth and Planetary Sciences en_US
dc.language.iso en_US en_US
dc.publisher Royal Meteorological Society en_US
dc.relation.isversionof http://dx.doi.org/10.1002/qj.211 en_US
dc.relation.hasversion http://environment.harvard.edu/docs/faculty_pubs/tziperman_high.pdf en_US
dash.license LAA
dc.subject cloud radiative forcing en_US
dc.subject Cretaceous en_US
dc.subject Eocene en_US
dc.subject Paleogene en_US
dc.title A High-Latitude Convective Cloud Feedback and Equable Climates en_US
dc.type Journal Article en_US
dc.description.version Version of Record en_US
dc.relation.journal Quarterly Journal of the Royal Meteorological Society en_US
dash.depositing.author Tziperman, Eli
dc.date.available 2009-12-14T17:56:43Z

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  • FAS Scholarly Articles [7470]
    Peer reviewed scholarly articles from the Faculty of Arts and Sciences of Harvard University

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