Deep Convection Initiation, Growth, and Environments in the Complex Terrain of Central Argentina during CACTI

Feng, Zhe; Varble, Adam; Hardin, Joseph; Marquis, James; Hunzinger, Alexis; Zhang, Zhixiao; Thieman, Mandana

doi:10.1175/mwr-d-21-0237.1

Deep Convection Initiation, Growth, and Environments in the Complex Terrain of Central Argentina during CACTI

Journal Article · Sun May 01 00:00:00 EDT 2022 · Monthly Weather Review

DOI:https://doi.org/10.1175/mwr-d-21-0237.1· OSTI ID:1869243

Feng, Zhe ^[1]; Varble, Adam ^[1]; Hardin, Joseph ^[1]; Marquis, James ^[1]; Hunzinger, Alexis ^[1]; Zhang, Zhixiao ^[2]; Thieman, Mandana ^[3]

Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Univ. of Utah, Salt Lake City, UT (United States)
NASA Langley Research Center, Hampton, VA (United States)

This study characterizes the wide range of deep convective cloud life cycles and their relationships with ambient environments observed during the Cloud, Aerosol, and Complex Terrain Interactions (CACTI) field campaign near the Sierras de Córdoba (SDC) range in central Argentina. We develop a novel convective cell tracking database for the entire field campaign using C-band polarimetric radar observations. The cell tracking database includes timing, location, area, depth, merge/split information, microphysical properties, collocated satellite-retrieved cloud properties, and sounding-derived environmental conditions. Results show that the SDC exerts a strong control on convection initiation (CI) and growth. CI preferentially occurs east of the SDC ridge during the afternoon, and cells often undergo upscale growth through the evening as they travel eastward toward the plains. Larger and more intense cells tend to occur in more unstable and humid low-level environments, and surface-based cells are stronger than elevated cells. Midtropospheric relative humidity and vertical wind shear also jointly affect the size and depth of the cells. Rapid cell area growth rates exhibit dependence on both large environmental wind shear and low-level moisture. Evolution of convective cell macro- and microphysical properties are strongly influenced by convective available potential energy and low-level humidity, as well as the presence of other cells in their vicinity. This cell tracking database demonstrates a framework that ties measurements from various platforms centering around convective life cycles to facilitate process understanding of factors that control convective evolution.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Atmospheric Radiation Measurement (ARM) Data Center; Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC), Biological and Environmental Research (BER)

Contributing Organization:: Argonne National Laboratory (ANL); Brookhaven National Laboratory (BNL); Oak Ridge National Laboratory (ORNL); Pacific Northwest National Laboratory (PNNL)

Grant/Contract Number:: AC02-05CH11231; AC05-00OR22725; AC05-76RL01830

OSTI ID:: 1869243

Alternate ID(s):: OSTI ID: 1869396

Report Number(s):: PNNL-SA-166620

Journal Information:: Monthly Weather Review, Journal Name: Monthly Weather Review Journal Issue: 5 Vol. 150; ISSN 0027-0644

Publisher:: American Meteorological SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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