Convective Self-Aggregation in Numerical Simulations: A Review
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Organized convection in the tropics occurs across a range of spatial and temporal scales and strongly influences cloud cover and humidity. One mode of organization found is “self-aggregation,” in which moist convection spontaneously organizes into one or several isolated clusters despite spatially homogeneous boundary conditions and forcing. Self-aggregation is driven by interactions between clouds, moisture, radiation, surface fluxes, and circulation, and occurs in a wide variety of idealized simulations of radiative–convective equilibrium. Here we provide a review of convective self-aggregation in numerical simulations, including its character, causes, and effects. We describe the evolution of self-aggregation including its time and length scales and the physical mechanisms leading to its triggering and maintenance, and we also discuss possible links to climate and climate change.
KeywordsSelf-aggregation Convective organization Radiative–convective equilibrium Convective processes Tropical convection Idealized modeling
This paper arises from the International Space Science Institute (ISSI) workshop on “Shallow clouds and water vapor, circulation and climate sensitivity.” AAW acknowledges support from an National Science Foundation AGS Postdoctoral Research Fellowship under Award 1433251.
- Beucler T, Emanuel KA (2016) Instabilities of radiative convective equilibrium with an interactive surface. In: Preprints 32nd Conference on hurricanes and tropical meteorology, San Juan, PR. American Meteorological Society, Tucson, AZGoogle Scholar
- Daleu CL, Plant RS, Woolnough SJ, Sessions S, Herman MJ, Sobel A, Wang S, Kim D, Cheng A, Bellon G, Peyrille P, Ferry F, Siebesma P, van Ulft L (2015) Intercomparison of methods of coupling between convection and large-scale circulation: I. Comparison over uniform surface conditions. J Adv Model Earth Syst. doi: 10.1002/2015MS000468
- Holloway CE, Wing AA, Bony S, Muller C, Masunaga H, L’Ecuyer TS, Turner DD, Zuidema P (2017) Observing convective aggregation. Surv Geophys (submitted)Google Scholar
- Khairoutdinov MF, Emanuel KA (2010) Aggregation of convection and the regulation of tropical climate. In: Preprints. 29th Conference on hurricanes and tropical meteorology. American Meteorological Society, Tucson, AZGoogle Scholar
- Miller DL, Mora CI, Grissino-Mayer HD, Mock CJ, Uhle ME, Sharp Z (2006) Tree-ring isotope records of tropical cyclone activity. Proc Nat Acad Sci 103:14,294–14,297Google Scholar
- Renno NO, Emanuel KA, Stone PH (1994) Radiative–convective model with an explicit hydrological cycle. Part i: formulation and sensitivity to model parameters. J Geophys Res. 99:14,429–14,441Google Scholar
- Tompkins A, Craig G (1998) Radiative–convective equilibrium in a three-dimensional cloud-ensemble model. Q J R Meteorol Soc 124:2073–2097Google Scholar
- Wing AA (2014) Physical mechanisms controlling self-aggregation of convection in idealized numerical modeling simulations. PhD thesis, MIT, Cambridge, 146 ppGoogle Scholar