Investigating the feasibility of artificial convective cloud creation

Abshaev, Magomet T.; Abshaev, A. M.; Zakinyan, R. G.; Zakinyan, Arthur; Wehbe, Youssef; Yousef, Latifa A.; Farrah, Sufian; Mandous, Abdulla Al

doi:10.1016/j.atmosres.2020.104998

Cited by 9 publications

(2 citation statements)

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“…Based on theoretical and experimental studies of the performance of various physical principles for stimulating convection in a cloudless atmosphere, a new method of creating updrafts, artificial clouds, and precipitation has been proposed 14 using a vertically directed buoyancy jet saturated with three types of hygroscopic aerosol with different hygroscopic points,i.e., for h 1 < 40%, 41 < h 2 < 70%, and 71 < h 3 |< 80%. In this case, the jet serves to initiate ascending flows, and condensation of water vapor on a coarsely dispersed hygroscopic aerosol can lead to energy replenishment and an increase in the buoyancy of ascending flows due to the release of condensation heat.…”

Section: Introductionmentioning

confidence: 99%

CFD simulation of updrafts initiated by a vertically directed jet fed by the heat of water vapor condensation

Abshaev¹,

Abshaev²,

Aksenov

et al. 2022

Sci Rep

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This paper presents the results of the development of a mathematical model and numerical simulation of the ascent in the atmosphere of a vertically directed jet fed by the heat of condensation of water vapor on a hygroscopic aerosol introduced into the jet at the start. The possibility of creating artificial convective clouds depending on jet parameters, condensation heat value and vertical profiles of wind speed, air temperature and humidity has been evaluated. Numerical experiments showed that the motion of a high-speed and high-temperature jet in the atmosphere has a complex turbulent nature. As the jet ascends, it expands, losing superheat and velocity. The temperature of the jet decreases faster than the velocity, so the jet rises slightly above the level at which its superheat disappears. The jet's ascent height increases as the humidity of the air and the vertical temperature gradient increase. Wind causes the jet to deform, bend, and decrease the height of ascent. Feed the jet with condensation heat results in a significant increase in jet lift height. This is particularly effective in the case of introducing into the jet two-layer NaCl/TiO2 nanoaerosol, which is capable of absorbing water vapor in an amount significantly greater than its mass. The simulation results are encouraging in the possibility of creating artificial updrafts that can lead to the formation of convective clouds and precipitation on days with favorable atmospheric conditions, when wind speed in the sub-cloud layer is < 6 m/s, air humidity is > 65%, and the temperature lapse rate is > 7.5 °C/km.

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Section: Introductionmentioning

confidence: 99%

CFD simulation of updrafts initiated by a vertically directed jet fed by the heat of water vapor condensation

Abshaev¹,

Abshaev²,

Aksenov

et al. 2022

Sci Rep

Self Cite

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“…Cloud seeding is a common technique that changes the amount or type of precipitation, dispels fog, suppresses hail and weakens hurricanes [1][2][3]. Precipitation modification activities are usually performed by dispersing seeding agent particles into the air, which can increase cloud condensation or ice nuclei to enhance surface precipitation [4].…”

Section: Introductionmentioning

confidence: 99%

Cloud Seeding Evidenced by Coherent Doppler Wind Lidar

Yuan

Wei

et al. 2021

Remote Sensing

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Evaluation of the cloud seeding effect is a challenge due to lack of directly physical observational evidence. In this study, an approach for directly observing the cloud seeding effect is proposed using a 1548 nm coherent Doppler wind lidar (CDWL). Normalized skewness was employed to identify the components of the reflectivity spectrum. The spectrum detection capability of a CDWL was verified by a 24.23-GHz Micro Rain Radar (MRR) in Hefei, China (117°15′ E, 31°50′ N), and different types of lidar spectra were detected and separated, including aerosol, turbulence, cloud droplet, and precipitation. Spectrum analysis was applied as a field experiment performed in Inner Mongolia, China (112°39′ E, 42°21′ N ) to support the cloud seeding operation for the 70th anniversary of China’s national day. The CDWL can monitor the cloud motion and provide windshear and turbulence information ensuring operation safety. The cloud-precipitation process is detected by the CDWL, microwave radiometer (MWR) and Advanced Geosynchronous Radiation Imager (AGRI) in FY4A satellites. In particular, the spectrum width and skewness of seeded cloud show a two-layer structure, which reflects cloud component changes, and it is possibly related to cloud seeding effects. Multi-component spectra are separated into four clusters, which are well distinguished by spectrum width and vertical velocity. In general, our findings provide new evidence that the reflectivity spectrum of CDWL has potential for assessing cloud seeding effects.

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