This work examines the efficacy of various physically-based 3 approaches derived from 1-D adiabatic parcel model frameworks (a numer-4 ical model and a simplified parameterization) to parameterize the cloud droplet 5 distribution characteristics for computing cloud effective radius and auto-conversion rate in regional/global atmospheric models. Evaluations are car-7 ried out for integrations wi...

Measurements of cloud condensation nuclei (CCN) concentrations (cm−3) at five levels of supersaturation between 0.2–1%, together with remote sensing profiling and aerosol size distributions, were performed at an urban background site of Athens during the Hygroscopic Aerosols to Cloud Droplets (HygrA-CD) campaign. The site is affected by local emissions and long-range transport, as portrayed by ...

Thirty-nine thunderstorms are examined using multiple-Doppler, polarimetric and total lightning observations to understand the role of mixed phase kinematics and microphysics in the development of lightning jumps. This sample size is larger than those of previous studies on this topic. The principal result of this study is that lightning jumps are a result of mixed phase updraft intensification...

Increasing endurance is a major challenge for battery-powered aerial vehicles. A method presented which makes use of an updraft around obstacles to decrease the power consumption fixed-wing unmanned vehicle. soaring flight controller has been developed that can autonomously soar while vehicle keeps its relative position moving object. Multiple simulations have performed analyse limitations unde...

In recent years, the study of numerical weather prediction (NWP) in complex orographic areas has attracted a great deal attention. Complex orography plays an important role occurrence and development extreme rainfall events. this study, Yin–He Global Spectrum Model (YHGSM) was used, wave number truncation method employed to decompose data different resolutions. The obtained with resolutions wer...

Observations during the Convection and Precipitation/Electrification (CaPE) project illustrate that horizontal convective rolls are capable of providing sufficient forcing to initiate free moist convection. Rolls occurred on the majority of days during CaPE but on only some of those days were they able to trigger thunderstorms. This study was undertaken to ascertain the difference between the t...

Aircraft and airborne cloud radar data are used to describe the vertical structure of the convective boundary layer (CBL) during cold-air outbreaks over Lake Michigan in January 2004. Two days with mesoscale cloud street structure and a day with cellular organization are contrasted. The radar reflectivity and vertical velocity structure of the CBL, as well as the radar-inferred topography of th...

The influence of aerosols on the atmospheric radiative budget, as seen in the effect of cloud condensation nuclei (CCN) on the optical properties of clouds, for example, is one of the key issues in understanding and predicting global climate change. To study quantitatively the effect of CCN on the optical properties of low-level layer clouds, we developed a cloud microphysical adiabatic parcel ...

A parameterization for cloud processing is presented that calculates activation of aerosol particles to cloud drops, cloud drop size, and pH-dependent aqueous phase sulfur chemistry. The parameterization is implemented in the global aerosol-climate model ECHAM5-HAM. The cloud processing parameterization uses updraft speed, temperature, and aerosol size and chemical parameters simulated by ECHAM...

Cloud radar, microwave radiometer, and lidar remote sensing data acquired during the Atlantic Stratocumulus Transition Experiment (ASTEX) are analyzed to address the relationship between (1) drop number concentration and cloud turbulence as represented by vertical velocity and vertical velocity variance and (2) drizzle formation and cloud turbulence. Six cases, each of about 12 hours duration, ...