Cloud Seedability Study with a Dual-Model System

In this research, a novel dual-model system, one-dimensional stratiform cold cloud model (1DSC) coupled to Weather Research and Forecast (WRF) model (WRF-IDSC for short), was employed to investigate the effects of cloud seeding by silver iodide (Agl) on rain enhancement. Driven by changing environmental conditions extracted from the WRF model, WRF-IDSC could be used to assess the cloud seeding effects quantitatively. The employment of WRF-IDSC, in place of a one-dimensional two-moment cloud seeding model applied to a three-dimensional mesoscale cloud-resolving model, was found to result in massive reduction of computational resources. Numerical experiments with WRF-IDSC were conducted for a real stratiform precipitation event observed on 4–5 July 2004, in Northeast China. A good agreement between the observed and modeled cloud system ensured the ability of WRF-IDSC to simulate the observed precipitation process efficiently. Sensitivity tests were performed with different seeding times, locations, ...