Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1175/JAS-D-19-0250.1 |
Impact of Convectively Generated Low-Frequency Gravity Waves on Evolution of Mesoscale Convective Systems | |
Adams-Selin, Rebecca D. | |
2020-10-01 | |
发表期刊 | Journal of the Atmospheric Sciences |
出版年 | 2020 |
英文摘要 | Idealized numerical simulations of mesoscale convective systems (MCSs) over a range of instabilities and shears were conducted to examine low-frequency gravity waves generated during initial and mature stages of convection. In all simulations, at initial updraft development a first-order wave was generated by heating extending through the depth of the troposphere. Additional first-order wave modes were generated each time the convective updraft reintensified. Each of these waves stabilized the environment in advance of the system. As precipitation descended below cloud base, and as a stratiform precipitation region developed, second-order wave modes were generated by cooling extending from the midlevels to the surface. These waves destabilized the environment ahead of the system but weakened the 0–5 km shear. Third-order wave modes could be generated by midlevel cooling caused by rear inflow intensification; these wave modes cooled the midlevels destabilizing the environment. The developing stage of each MCS was characterized by a cyclical process: developing updraft, generation of n = 1 wave, increase in precipitation, generation of n = 2 wave, and subsequent environmental destabilization reinvigorating the updraft. After rearward expansion of the stratiform region, the MCSs entered their mature stage and the method of updraft reinvigoration shifted to absorbing discrete convective cells produced in advance of each system. Higher-order wave modes destabilized the environment, making it more favorable to development of these cells and maintenance of the MCS. As initial simulation shear or instability increased, the transition from cyclical wave/updraft development to discrete cell/updraft development occurred more quickly. |
领域 | 地球科学 ; 气候变化 |
URL | 查看原文 |
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文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/297893 |
专题 | 地球科学 气候变化 |
推荐引用方式 GB/T 7714 | Adams-Selin, Rebecca D.. Impact of Convectively Generated Low-Frequency Gravity Waves on Evolution of Mesoscale Convective Systems[J]. Journal of the Atmospheric Sciences,2020. |
APA | Adams-Selin, Rebecca D..(2020).Impact of Convectively Generated Low-Frequency Gravity Waves on Evolution of Mesoscale Convective Systems.Journal of the Atmospheric Sciences. |
MLA | Adams-Selin, Rebecca D.."Impact of Convectively Generated Low-Frequency Gravity Waves on Evolution of Mesoscale Convective Systems".Journal of the Atmospheric Sciences (2020). |
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