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DOI | 10.1175/JAS-D-17-0140.1 |
Beyond the Rigid Lid: Baroclinic Modes in a Structured Atmosphere | |
Edman, Jacob P.1; Romps, David M. | |
2017-11-01 | |
发表期刊 | JOURNAL OF THE ATMOSPHERIC SCIENCES
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ISSN | 0022-4928 |
EISSN | 1520-0469 |
出版年 | 2017 |
卷号 | 74期号:11 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | The baroclinic-mode decomposition is a fixture of the tropical-dynamics literature because of its simplicity and apparent usefulness in understanding a wide range of atmospheric phenomena. However, its derivation relies on the assumption that the tropopause is a rigid lid that artificially restricts the vertical propagation of wave energy. This causes tropospheric buoyancy anomalies of a single vertical mode to remain coherent for all time in the absence of dissipation. Here, the authors derive the Green's functions for these baroclinic modes in a two-dimensional troposphere (or, equivalently, a three-dimensional troposphere with one translational symmetry) that is overlain by a stratosphere. These Green's functions quantify the propagation and spreading of gravity waves generated by a horizontally localized heating, and they can be used to reconstruct the evolution of any tropospheric heating. For a first-baroclinic two-dimensional right-moving or left-moving gravity wave with a characteristic width of 100 km, its initial horizontal shape becomes unrecognizable after 4 h, at which point its initial amplitude has also been reduced by a factor of 1/pi. After this time, the gravity wave assumes a universal shape that widens linearly in time. For gravity waves on a periodic domain the length of Earth's circumference, it takes only 10 days for the gravity waves to spread their buoyancy throughout the entire domain. |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000417994800004 |
WOS关键词 | GRAVITY-WAVES ; TROPICAL CIRCULATION ; EQUATORIAL WAVES ; TROPOSPHERE ; CONVECTION ; TEMPERATURE ; DYNAMICS ; CLOUDS ; PART ; TIME |
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/29769 |
专题 | 地球科学 |
作者单位 | 1.Univ Calif Berkeley, Dept Earth & Planetary Sci, Berkeley, CA 94720 USA; 2.Lawrence Berkeley Natl Lab, Climate & Ecosyst Sci Div, Berkeley, CA USA |
推荐引用方式 GB/T 7714 | Edman, Jacob P.,Romps, David M.. Beyond the Rigid Lid: Baroclinic Modes in a Structured Atmosphere[J]. JOURNAL OF THE ATMOSPHERIC SCIENCES,2017,74(11). |
APA | Edman, Jacob P.,&Romps, David M..(2017).Beyond the Rigid Lid: Baroclinic Modes in a Structured Atmosphere.JOURNAL OF THE ATMOSPHERIC SCIENCES,74(11). |
MLA | Edman, Jacob P.,et al."Beyond the Rigid Lid: Baroclinic Modes in a Structured Atmosphere".JOURNAL OF THE ATMOSPHERIC SCIENCES 74.11(2017). |
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