Aerosol impacts on drizzle properties in warm clouds from ARM Mobile Facility maritime and continental deployments

摘要: We have extensively evaluated the response of cloud base drizzle rate (Rcb; mm d−1) in warm clouds to liquid water path (LWP; g m−2) and condensation nuclei (CCN) number concentration (NCCN; cm−3), an aerosol proxy. This evaluation is based on a 19 month long data set Doppler radar, lidar, microwave radiometers, observing systems from Atmospheric Radiation Measurement (ARM) Mobile Facility deployments at Azores Germany. Assuming 0.55% supersaturation calculate NCCN, we found power law Rcb=0.0015±0.0009⋅LWP1.68±0.05NCCN−0.66±0.08, indicating that Rcb decreases by factor 2–3 as NCCN increases 200 1000 cm−3 for fixed LWP. Additionally, precipitation susceptibility ranges between 0.5 0.9, agreement with values simulations aircraft measurements. Surprisingly, probability our analysis much higher than CloudSat estimates but agrees well multiscale high-resolution aerosol-climate model. Although scale issues are not completely resolved intercomparisons, results encouraging, suggesting it possible models accurately simulate LWP perturbations.