Shear-convection interactions and orientation of tropical squall lines

Abramian S, Muller CJ, Risi C. 2022. Shear-convection interactions and orientation of tropical squall lines. Geophysical Research Letters. 49(1), e2021GL095184.

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Journal Article | Published | English

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Author
Abramian, Sophie; Muller, Caroline JISTA ; Risi, Camille
Abstract
Squall lines are known to be the consequence of the interaction of low-level shear with cold pools associated with convective downdrafts. Also, as the magnitude of the shear increases beyond a critical shear, squall lines tend to orient themselves. The existing literature suggests that this orientation reduces incoming wind shear to the squall line, and maintains equilibrium between wind shear and cold pool spreading. Although this theory is widely accepted, very few quantitative studies have been conducted on supercritical regime especially. Here, we test this hypothesis with tropical squall lines obtained by imposing a vertical wind shear in cloud resolving simulations in radiative convective equilibrium. In the sub-critical regime, squall lines are perpendicular to the shear. In the super-critical regime, their orientation maintain the equilibrium, supporting existing theories. We also find that as shear increases, cold pools become more intense. However, this intensification has little impact on squall line orientation.
Publishing Year
Date Published
2022-01-16
Journal Title
Geophysical Research Letters
Acknowledgement
The authors gratefully acknowledge funding from the European Research Council (ERC) under the European Union's Horizon 2020 research and innovation program (Project CLUSTER, Grant Agreement No. 805041), and from the PhD fellowship of Ecole Normale Supérieure de Paris-Saclay. Two supplementary movies are also provided showing the angle detection method and the squall line of the Usfc = 10 m s−1 simulation.
Volume
49
Issue
1
Article Number
e2021GL095184
ISSN
eISSN
IST-REx-ID

Cite this

Abramian S, Muller CJ, Risi C. Shear-convection interactions and orientation of tropical squall lines. Geophysical Research Letters. 2022;49(1). doi:10.1029/2021GL095184
Abramian, S., Muller, C. J., & Risi, C. (2022). Shear-convection interactions and orientation of tropical squall lines. Geophysical Research Letters. American Geophysical Union ; Wiley. https://doi.org/10.1029/2021GL095184
Abramian, Sophie, Caroline J Muller, and Camille Risi. “Shear-Convection Interactions and Orientation of Tropical Squall Lines.” Geophysical Research Letters. American Geophysical Union ; Wiley, 2022. https://doi.org/10.1029/2021GL095184.
S. Abramian, C. J. Muller, and C. Risi, “Shear-convection interactions and orientation of tropical squall lines,” Geophysical Research Letters, vol. 49, no. 1. American Geophysical Union ; Wiley, 2022.
Abramian S, Muller CJ, Risi C. 2022. Shear-convection interactions and orientation of tropical squall lines. Geophysical Research Letters. 49(1), e2021GL095184.
Abramian, Sophie, et al. “Shear-Convection Interactions and Orientation of Tropical Squall Lines.” Geophysical Research Letters, vol. 49, no. 1, e2021GL095184, American Geophysical Union ; Wiley, 2022, doi:10.1029/2021GL095184.
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2022-01-24
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