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GEOPHYSICAL RESEARCH LETTERS,
VOL. 34,
L15707,
5 PP., 2007
doi:10.1029/2007GL029698
Cloud and radiation budget changes associated with tropical intraseasonal oscillations
Earth System Science Center, University of Alabama in Huntsville, Huntsville, Alabama, USA
Earth System Science Center, University of Alabama in Huntsville, Huntsville, Alabama, USA
Earth System Science Center, University of Alabama in Huntsville, Huntsville, Alabama, USA
Lawrence Livermore National Laboratory, Livermore, California, USA
We explore the daily evolution of tropical intraseasonal oscillations in satellite-observed tropospheric temperature, precipitation, radiative fluxes, and cloud properties. The warm/rainy phase of a composited average of fifteen oscillations is accompanied by a net reduction in radiative input into the ocean-atmosphere system, with longwave heating anomalies transitioning to longwave cooling during the rainy phase. The increase in longwave cooling is traced to decreasing coverage by ice clouds, potentially supporting Lindzen's “infrared iris” hypothesis of climate stabilization. These observations should be considered in the testing of cloud parameterizations in climate models, which remain sources of substantial uncertainty in global warming prediction.
Received 15 February 2007; accepted 16 July 2007; published 9 August 2007.
Citation: (2007), Cloud and radiation budget changes associated with tropical intraseasonal oscillations, Geophys. Res. Lett., 34, L15707, doi:10.1029/2007GL029698.
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