Numerical Experiments on the Mechanisms for the Development and Maintenance of Long-Lived Squall Lines in Dry Environments
Tetsuya Takemi,Takehiko Satomura +1 more
TLDR
In this article, the authors investigated the mechanisms responsible for the development and maintenance of long-lived squall lines in dry environments through two-dimensional numerical experiments by using a nonhydrostatic cloud model.Abstract:
The mechanisms responsible for the development and maintenance of long-lived squall lines in dry environments are investigated through two-dimensional numerical experiments by using a nonhydrostatic cloud model. The squall line environments are characterized by a low convective available potential energy (CAPE), low moisture content, and a high level of free convection (LFC), which are based on observations of a squall line over an arid region in China. Although these environments seem to be unfavorable for the development of convective systems, a long-lived squall line is simulated in the environment of a well-mixed moisture profile within a deep, mixed boundary layer. During the mature stage of this simulated squall line, the air parcels originating in the upper part of the mixed layer ahead of a surface cold-air pool are lifted to the upper troposphere. On the other hand, the air parcels originating in the lower part of the mixed layer are forced to go rearward, never reaching the upper levels...read more
Citations
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A Survey of Precipitation-Induced Atmospheric Cold Pools over Oceans and Their Interactions with the Larger-Scale Environment
TL;DR: In this article, the authors survey current understanding of cold pools over the tropical and subtropical oceans and discuss the relationship between cold pools, their accompanying moisture distribution and cloud cover.
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High-resolution simulations of convective cold pools over the northwestern Sahara
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Dust storms and cyclone tracks over the arid regions in east Asia in spring
Tetsuya Takemi,Naoko Seino +1 more
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A transition mechanism for the spontaneous axisymmetric intensification of tropical cyclones
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Relationship of atmospheric boundary layer depth with thermodynamic processes at the land surface in arid regions of China
TL;DR: In this paper, the depth of diurnal and nocturnal ABLs and their related thermodynamic features of land surface processes, including net radiation, the ground-air temperature difference and sensible heat flux, under typical summer and winter conditions are discussed on the basis of comprehensive observations of the ABL and thermodynamic processes at the land surface carried out in the extreme arid zone of Dunhuang.
References
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Mesoscale and Convective–Scale Downdrafts as Distinct Components of Squall-Line Structure
TL;DR: In this paper, the authors describe the two different kinds of downdraft air frequently observed to the rear of some low-latitude squall lines at low levels, and the lowest layer is hypothesized to be the product of convective-scale saturated downdavs and the drier air is the result of mesoscale unsaturated downdvings as described by Zipser.