Daytime Cycle of Low-Level Clouds and the Tropical Convective Boundary Layer in Southwestern Amazonia

摘要: During the wet season in southwestern Amazon region, daytime water transport out of atmospheric mixed layer into deeper atmosphere is shown to depend upon cloud amounts and types synoptic-scale velocity fields. Interactions among clouds, convective conditions, subcloud-layer properties were estimated for two dominant flow regimes observed during 1999 Tropical Rainfall Measuring Mission component Brazilian Large-Scale Biosphere–Atmosphere (TRMM-LBA) field campaign. subcloud layers coupled by radiative, convective, precipitation processes. The varied according different influences easterly versus westerly lower-tropospheric flows. most pronounced flow-regime effects on composite cycles occurred under persistent flows, which produced strong growth with a near absence low-level stratiform minimal cumulative attenuation incoming solar irradiance (25%), rapid mixed-layer ( 100 mh 1 ), boundary drying (0.22 g kg h high velocities (1.5 m s surface buoyancy flux 200 Wm 2 latent heat (600 W ) layer. In contrast, flows less showing morning presence genera (0.9 amount), greater (47%), slower 50 slight tendency moistening, delayed peak cumuliform cycle (2000 1700 UTC). results reported this article indicate that numerical models need account when estimating vapor