A Relationship Between the Cumulus Convective Activity Determined from Direct Cloud Observation and Large-Scale Meteorological Parameters

[摘要] A relationship between cumulus convective activity and large-scale meteorological parameters was studied by aerial cloud observations during AMTEX '74 and AMTEX '75. The cloud volume per 1km2 was adopted as a measure of cumulus convective activity and large-scale meteorological parameters were represented by the mean values over the analyzed area enclosed by four aerological stations.It was found that some strong cumulus convective activity of more than 2km3 in the cloud volume per 1km2 was associated with some large upward motion and water-vapor flux convergence. On the other hand, when the cumulus convective activity was as weak as less than 1km3 in the cloud volume per 1km2, meteorological parameters showed even suppressed conditions such as downward motion and divergence of water-vapor flux. Systematic relations were not found in this analysis between the cloud volume per 1km2 and both relative humidity and v-component of winds.

[学科分类] 大气科学