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  • Lidar remote sensing of cloud formation caused by low-level jets

    The East Hampton Roads Aerosol Flux (EHRAF) measurement campaign was sponsored by the US Army Research Office and conducted 19-22 May 2014 on the campus of HU in Southeastern Virginia (40.822ºN, 73.949ºW) by Dr. Jia Su from HU’s Center for Atmospheric Science, Mr. Melvin Felton from US Army Research Laboratory’s (ARL’s) Battlefield Environment Division, and Dr. Ruben Delgado from University of Maryland Baltimore County (UMBC) Joint Center of Earth Systems Technology to research properties low-level jets(LLJs).

    LLJs were observed from evening 20 May to morning 21 May and were found to lead to cloud formation. The cloud formation caused by LLJs is analyzed using data that includes high-resolution profiles of: aerosol backscatter, turbulence structure, temperature, wind speed and direction, and water vapor.  It is found that enhanced nighttime turbulence triggered by LLJs causes the aerosol and water vapor content of boundary layer to be lifted up, forming a well-mixed regions. We show that this region contains the cloud condensation nuclei that are very important for  formation of clouds.