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首页> 外文期刊>Planetary and space science >Planetary-size dependence of zonal jets: Effects of horizontal diffusion in an idealized Earth-like general circulation model
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Planetary-size dependence of zonal jets: Effects of horizontal diffusion in an idealized Earth-like general circulation model

机译:地形速率的行星尺寸依赖性:水平扩散在理想的地球状一般循环模型中的影响

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摘要

The planetary-size dependence of atmospheric circulation and the effects of subgrid-scale horizontal diffusion are elucidated in this study using an idealized general circulation model. An equatorial super-rotation is formed when a planetary radius is equal to or smaller than 1/3 that of the Earth (r* = 1/3, where the planetary-size parameter r* is normalized by the Earth's radius). The mid-latitude jet becomes stronger and shifts poleward as r* decreases to 1/8. The empirical Smagorinsky horizontal diffusion does not significantly affect mid-latitude jets in large-planet experiments of r* = 1/8. In contrast, in small-planet experiments with r* = 1/20, equatorial super-rotation is predominant when applying the Smagorinsky diffusion, whereas high-latitude jets are predominant in the absence of such a diffusion. Therefore, the possibility of two different circulation patterns must be considered: an equatorial jet pattern and a high-latitude jet pattern. In the small-planet experiment with the Smagorinsky diffusion, zonal jets are developed around poles where the Reynolds number is low for zonal circulation. In such a case, subgrid-scale dissipations significantly affect the high-latitude jet during spin-up. After this process, the developed high-latitude jets collapse, and the equatorial superrotation becomes predominant. Because the wind deviating from the rigid-body rotation is sensitive to the subgrid-scale diffusion parameter at high latitudes, the validity of the parameterized horizontal diffusion must be carefully assessed when investigating the planetary-size dependence of the general circulation.
机译:本研究中,在本研究中阐明了大气循环的行星尺寸依赖性以及亚级尺度水平扩散的影响。当行星半径等于或小于1/3的地球(R * <= 1/3的1/3时,形成赤道超旋转(R * <= 1/3,其中行星尺寸参数R *被地球半径归一化)。中纬度射流变得更强并且向极端移动,因为R *降低至1/8。经验性Smagorinsky水平扩散不会显着影响R *> = 1/8的大行星实验中的中纬夹具。相反,在R * = 1/20的小行星实验中,施加Smagorinsky扩散时赤道超旋转是主要的,而在没有这种扩散的情况下,高纬度射流是主要的。因此,必须考虑两种不同循环模式的可能性:赤道喷射图案和高纬度喷射图案。在具有Smagorinsky扩散的小行星实验中,围绕河豚开发了Zonal射流,其中雷诺数对于区间循环。在这种情况下,划分级耗散在旋转期间显着影响高纬度射流。在此过程之后,开发的高纬度射流塌陷,并且赤道叠加变得使得占主导地位。由于偏离刚体旋转的风对高纬度的底板级扩散参数敏感,因此在研究一般循环的行星尺寸依赖性时必须仔细地评估参数化水平扩散的有效性。

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  • 来源
    《Planetary and space science》 |2020年第10期|104976.1-104976.14|共14页
  • 作者

    Lu Liyuan; Yamamoto Masaru;

  • 作者单位

    Kyushu Univ Interdisciplinary Grad Sch Engn Sci Kasuga Fukuoka Japan;

    Kyushu Univ Res Inst Appl Mech 6-1 Kasuga Kouen Kasuga Fukuoka 8168580 Japan;

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  • 正文语种 eng
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