ISSN 1000-0526
CN 11-2282/P
CN 11-2282/P
A Case Analysis on Microphysical Characteristicsof Summer Stratiform Cloud in Gansu Province
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Abstract:
The cloud microphysical data measured by the airborne PMS probes in a precipitating stratiform cloud on June 12, 2004 in Hexi Corridor region of Gansu Province are analyzed. The cloud microphysical characteristics in both horizont al and vertical direction are presented through analyzing number concentration, mean diameter, shape and size distribution of cloud particles sampled with FSSP 100 probe and OAP2DGA2 probe. The results show that the cloud is AcSc configuration, and dry layer between Ac and Sc clouds is deep. Both vertical and horizontal varieties of cloud microphysical parameter show obviously inhomogeneous features. Th e cloud particle number concentration measured by FSSP100 changes from 0.1cm-3 to 232.6cm-3, and the mean diameter is around 3.5～45.5μm. The cha nge scopes of corresponding data explored with OAP2DGA2 are respectively 0.0 1～1167L-1 and 32.2～995.7μm. The particle images indicate that the rimin g, accretion and aggregation of ice and snow crystals are quiet universal, and i t shows that the supercooled water content in cloud is high. There are high co ncentration regions above 6000m altitude. Growth of massive ice crystals consume s largely the supercooled water, sequentially restraining the production or gr owth of big particles. The cool cloud processes are dominant during precipitatio n, and warm cloud processes is not distinct in Sc cloud.
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