Role of Surface Friction on Shallow Nonprecipitating Convection

Journal Article · 03 January 2018 · Journal of the Atmospheric Sciences

DOI: https://doi.org/10.1175/jas-d-17-0106.1 · OSTI ID:1415522

Park, Seung-Bu ^[1]; Böing, Steven ^[2]; Gentine, Pierre ^[3]

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1. Columbia Univ., New York, NY (United States). Dept. of Earth and Environmental Engineering; Pusan National Univ., Busan (Korea, Republic of). Inst. for Basic Science Center for Climate Physics
2. Univ. of Leeds, Leeds (United Kingdom). School of Earth and Environment
3. Columbia Univ., New York, NY (United States). Dept. of Earth and Environmental Engineering

The role of surface friction on shallow nonprecipitating convection is investigated using a series of large-eddy simulations with varying surface friction velocity and with a cloud identification algorithm. As surface friction intensifies, convective rolls dominate over convective cells and secondary overturning circulation becomes stronger in the subcloud layer, thus transporting more moisture upward and more heat downward between the subcloud and cloud layers. Identifying individual clouds, using the identification algorithm based on a three-dimensional topological analysis, reveals that intensified surface friction increases the number of clouds and the degree of tilting in the downstream direction. Highly intensified surface friction increases wind shear across the cloud base and induces cloud tilting, which leads to a vertically parabolic profile of liquid water mixing ratio instead of the classical two-layer structure (conditionally unstable and trade inversion layers). Furthermore, cloud tilting induces more cloud cover and more cloud mass flux much above the cloud base (e.g., 0.8 < z < 1.2 km), but less cloud cover and less cloud mass flux in the upper cloud layer (e.g., z > 1.2 km) because of increased lateral entrainment rate. Similarly, profiles of directly measured entrainment and detrainment rates show that detrainment in the lower cloud layer becomes smaller with stronger surface friction.

• Research Organization: Columbia Univ., New York, NY (United States)
• Sponsoring Organization: USDOE Office of Science (SC)
• Grant/Contract Number: SC0011094; SC0014203
• OSTI ID: 1415522
• Alternate ID(s): OSTI ID: 1541820
• Journal Information: Journal of the Atmospheric Sciences, Vol. 75, Issue 1; ISSN 0022-4928
• Publisher: American Meteorological SocietyCopyright Statement
• Country of Publication: United States
• Language: English