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DOI | 10.1175/JAS-D-17-0192.1 |
The Response of an Idealized Atmosphere to Localized Tropical Heating: Superrotation and the Breakdown of Linear Theory | |
Lutsko, Nicholas J.1,2 | |
2018 | |
发表期刊 | JOURNAL OF THE ATMOSPHERIC SCIENCES
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ISSN | 0022-4928 |
EISSN | 1520-0469 |
出版年 | 2018 |
卷号 | 75期号:1页码:3-20 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | An equatorial heat source mimicking the strong diabatic heating above the west Pacific is added to an idealized, dry general circulationmodel. For small (<0.5Kday(-1)) heating rates the responses closelymatch the expectations fromlinear Matsuno-Gill theory, though the amplitudes of the responses increase sublinearly. This "linear'' regime breaks down for larger heating rates and it is found that this is because the stability of the tropical atmosphere increases. At the same time, the equatorial winds increasingly superrotate. This superrotation is driven by stationary eddy momentum fluxes by the waves excited by the heating and is damped by the vertical advection of lowmomentum air by the mean flow and, at large heating rates, by the divergence of momentum by transient eddies. These dynamics are explored in additional experiments in which the equator-to-pole temperature gradient is varied. Very strong superrotation is produced when a large heating rate is applied to a setup with a relatively weak equator-to-pole temperature gradient, though there is no evidence that this is a case of "runaway'' superrotation. |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000425750200001 |
WOS关键词 | EQUATORIAL SUPERROTATION ; GENERAL-CIRCULATION ; EL-NINO ; TEMPERATURE-GRADIENT ; ABRUPT TRANSITION ; UPPER TROPOSPHERE ; MODEL ; MJO ; WAVES ; GCM |
WOS类目 | Meteorology & Atmospheric Sciences |
WOS研究方向 | Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/29684 |
专题 | 地球科学 |
作者单位 | 1.Princeton Univ, Program Atmospher & Ocean Sci, Princeton, NJ 08544 USA; 2.MIT, Dept Earth Atmospher & Planetary Sci, Cambridge, MA 02139 USA |
推荐引用方式 GB/T 7714 | Lutsko, Nicholas J.. The Response of an Idealized Atmosphere to Localized Tropical Heating: Superrotation and the Breakdown of Linear Theory[J]. JOURNAL OF THE ATMOSPHERIC SCIENCES,2018,75(1):3-20. |
APA | Lutsko, Nicholas J..(2018).The Response of an Idealized Atmosphere to Localized Tropical Heating: Superrotation and the Breakdown of Linear Theory.JOURNAL OF THE ATMOSPHERIC SCIENCES,75(1),3-20. |
MLA | Lutsko, Nicholas J.."The Response of an Idealized Atmosphere to Localized Tropical Heating: Superrotation and the Breakdown of Linear Theory".JOURNAL OF THE ATMOSPHERIC SCIENCES 75.1(2018):3-20. |
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