Showing papers on "Convective available potential energy published in 1984"

The Environment of Fast- and Slow-Moving Tropical Mesoscale Convective Cloud Lines

Abstract: Rawinsonde data from GATE are composited to examine the environmental similarities and differences between fast-moving (line speed VL > 7 m s−1) and slow-moving VL < 3 m s−1) mesoscale convective cloud lines. Thermodynamic structures for the two types of line are similar with respect to the mixed-layer values of θe and convective available potential energy, but the fast-moving lines have a more pronounced minimum in θe at ∼700 mb. Kinematic structure shows that the vertical shows of the horizontal wind is normal to the leading edge of convention in the fast-moving convective lines but parallel to the leading edge of the slow-moving cloud lines. The results suggest that the type of line (fast versus slow) which forms may be affected by the initial environmental conditions.

Radar analysis of a tropical convective boundary layer with shallow cumulus clouds

Abstract: A situation of fairweather cloudy convection is examined using a dual Doppler radar, environmental measurements and cloud photogrammetry. The convective layer is characterized by the interaction between the northward monsoon wind at low levels and the easterly wind above; a convective organisation is found to be related to the shear between the two flows. Moreover, at the convective scale, properties of the convective layer below clouds and in clear air are considered. They show significant differences in buoyancy ans entrainment effects bur similar effects of the shear on variances ans momentum production profiles