| Idealized Numerical Simulation Study of the Potential Vorticity Banners over a Mesoscale Mountain： Dry Adiabatic Process |
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| 引用本文： | 王其伟,谈哲敏.Idealized Numerical Simulation Study of the Potential Vorticity Banners over a Mesoscale Mountain： Dry Adiabatic Process[J].大气科学进展,2009,26(5):906-922. |
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| 作者姓名： | 王其伟 谈哲敏 |
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| 作者单位： | Key Lab of Mesoscale Severe Weather/MOE, School of Atmospheric Sciences, Nanjing University, Nanjing 210093,Key Lab of Mesoscale Severe Weather/MOE, School of Atmospheric Sciences, Nanjing University, Nanjing 210093 |
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| 基金项目： | The National Natural Science Foundation of China (General Program, Key Program, Major Research Plan) |
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| 摘 要： | Topography-induced potential vorticity (PV) banners over a mesoscale topography (Dabie Mountain, hereafter DM) in eastern China, under an idealized dry adiabatic flow, are studied with a mesoscale numerical model, ARPS. PV banners generate over the leeside of the DM with a maximal intensity of ～1.5 PVU, and extend more than 100 km downstream, while the width varies from several to tens of kilometers, which contrasts with the half-width of the peaks along the ridge of the DM. Wave breaking occurs near the le...
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| 关 键 词： | 绝热过程 多尺度 理想化 模拟 位涡 山区 数值 |
| 收稿时间： | 1/4/2008 12:00:00 AM |
Idealized numerical simulation study of the potential vorticity banners over a mesoscale mountain: Dry adiabatic process |
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| Qiwei Wang,Zhemin Tan.Idealized numerical simulation study of the potential vorticity banners over a mesoscale mountain: Dry adiabatic process[J].Advances in Atmospheric Sciences,2009,26(5):906-922. |
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| Authors: | Qiwei Wang Zhemin Tan |
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| Institution: | Key Lab of Mesoscale Severe Weather/MOE, School of Atmospheric Sciences, Nanjing University, Nanjing 210093,Key Lab of Mesoscale Severe Weather/MOE, School of Atmospheric Sciences, Nanjing University, Nanjing 210093 |
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| Abstract: | Topography-induced potential vorticity (PV) banners over a mesoscale topography (Dabie Mountain,
hereafter DM) in eastern China, under an idealized dry adiabatic flow, are studied with a mesoscale numerical
model, ARPS. PV banners generate over the leeside of the DM with a maximal intensity of ~1.5 PVU, and
extend more than 100 km downstream, while the width varies from several to tens of kilometers, which contrasts
with the half-width of the peaks along the ridge of the DM.
Wave breaking occurs near the leeside surface of the DM, and leads to a strong PV generation. Combining with
the PV generation, due to the friction and the flow splitting upstream, the PV is advected downstream, and
then forms the PV banners over the DM. The PV banners are sensitive to the model resolution, Coriolis force,
friction, subgrid turbulent mixing, stratification, the upstream wind speed and wind direction. The negative
PV banners have a more compact connection with the low level turbulent kinetic energy.
The PV banners are built up by the baroclinic and barotropic components. The barotropic-associated PV can
identify the distribution of the PV banners, while the baroclinic one only has important contributions on
the flanks and on the leeside near the topography. PV fluxes are diagnosed to investigate the influence
of friction on the PV banners. Similar patterns are found between the total PV flux and the advective PV
flux, except near the surface and inside the dipole of the PV banners, where the nonadvective PV flux
associated with the friction has a net negative contribution. |
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| Keywords: | potential vorticity banners surface friction turbulent kinetic energy Dabie Mountain |
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