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Using spatial and vertical distributions of clouds derived from multi-yearspaceborne observations, this paper presents the characteristics of asignificant "pool of inhibited cloudiness" covering an area of >106 km2between 3–13° N and 77–90° E over the Bay of Bengal (BoB),persisting throughout the Asian summer monsoon season (ASM). Seasonal meanprecipitation rate over the "pool" is <3 mm day−1 while that over thesurrounding regions is mostly in the range of 6–14 mm day−1. Frequency ofoccurrence of clouds in this "pool" is ~20–40 % less than that overthe surrounding deep convective regions. Zonal and meridional cross sectionsof the altitude distribution of clouds derived from CloudSat data reveal avault-like structure at the "pool" with little cloudiness below ~7 km,indicating that this "pool" is almost fully contributed by the substantiallyreduced or near-absence of low- and middle-level clouds. This suggest theabsence of convection in the "pool" region. Spaceborne scatterometerobservations show divergence of surface wind at the "pool" and convergenceat its surroundings, suggesting the existence of a mini-circulation embeddedin the large-scale monsoon circulation. Reanalysis data shows amini-circulation extending between the surface and ~3 km altitude, butits spatial structure does not match well with that inferred from the aboveobservations. Sea surface at the south BoB during ASM is sufficiently warmto trigger convection, but is inhibited by the subsidence associated withthe mini-circulation, resulting in the "pool". This mini-circulation might bea dynamical response of the atmosphere to the substantial spatial gradientof latent heating by large-scale cloudiness and precipitation at the vastand geographically fixed convective zones surrounding the "pool". Subsidenceat the "pool" might contribute to the maintenance of convection at the abovezones and be an important component of ASM that is overlooked hitherto

annales geophysicae

Characteristics of a persistent &amp;quot;pool of inhibited cloudiness&amp;quot; and its genesis over the Bay of Bengal associated with the Asian summer monsoon