Abstract
Within the larger context of Project METROMEX, temporal and spatial analyses of daytime specific humidity and potential temperature were evaluated for the surface and for the mixing layer over the St. Louis area. Data from instrumented aircraft, fixed and mobile surface stations and radiosondes were evaluated on a case study basis. Anthropogenic sources and sinks of water vapor were estimated. Mesoscale dry regions at the urban surface are associated with particular urban land use types. Dry regions within the urban mixing layer show a reduction of 10–20% in specific humidity, these appear to result from a combination of reduced surface evaporation and increased downward entrainment at the top of the mixing layer.
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