Journal
GEOPHYSICAL RESEARCH LETTERS
Volume 40, Issue 5, Pages 994-998Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1002/grl.50204
Keywords
Convection; Atmospheric Models; Cloud-Resolving Models
Categories
Funding
- U.S. Department of Energy's Earth System Modeling, an Office of Science, Office of Biological and Environmental Research program [DE-AC02-05CH11231]
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Convective self-aggregation refers to a phenomenon in cloud-resolving simulations wherein the atmosphere spontaneously develops a circulation with a convecting moist patch and a nonconvecting dry patch. All previous studies have found a sharp transition to aggregated convection when the domain size exceeds a critical threshold, typically in the range of 200300km. Here, we show that cold pools are responsible for this sharp transition. When cold pools are inhibited, self-aggregation occurs at all domain sizes. In this case, the aggregation strength decreases smoothly as the domain size L is decreased below about 200300km. A streamfunction analysis reveals two distinct sources for the air subsiding into the dry-patch boundary layer: a moist, shallow circulation and a dry, deep circulation. The deep circulation scales with L, whereas the shallow circulation does not. At small L, the shallow circulation dominates, thereby weakening the aggregation.
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