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DOI | 10.1175/JAS-D-16-0329.1 |
Wave-Mean-Flow Interactions in Moist Baroclinic Life Cycles | |
Yamada, Ray1; Pauluis, Olivier2,3 | |
2017-07-01 | |
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:7 |
文章类型 | Article |
语种 | 英语 |
国家 | USA; U Arab Emirates |
英文摘要 | Previous studies show that the moist Eliassen-Palm(EP) flux captures a greater eddy momentum exchange through form drag than the dry EP flux in the midlatitude climate. This suggests that the eddy moisture flux acts to decrease the baroclinicity of the zonal jet. This study investigates such a mechanism in moist baroclinic life cycles, which are simulated in an idealized general circulation model with large-scale condensation as the only moist process. The runs are analyzed using a linear diagnostic based on the Kuo-Eliassen equation to decompose the jet change into parts driven by individual forcing terms. It is shown that the wave-induced latent heating drives an indirect Eulerian-mean cell on the equatorward flank of the jet, which acts to reduce the baroclinicity in that region. The eddy sensible heat fluxes act to reduce the baroclinicity near the center of the jet. The moist baroclinic forcing strengthens as the amount of initially available moisture increases. The effect of the eddy moisture flux on the transformed Eulerian-mean (TEM) and isentropic dynamics is also considered. It is shown that the circulation and EP flux on moist isentropes is around 4 times as strong and extends farther equatorward than on dry isentropes. The equatorward extension of the moist EP flux coincides with the region where the baroclinic forcing is driven by latent heating. The moist EP flux successfully captures the moisture-driven component of the baroclinic forcing that is not seen in the dry EP flux. |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000405556700003 |
WOS关键词 | ELIASSEN-PALM FLUX ; CIRCULATION ; TROPOSPHERE ; ATMOSPHERE |
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/29737 |
专题 | 地球科学 |
作者单位 | 1.MIT, Dept Earth Atmospher & Planetary Sci, Cambridge, MA 02139 USA; 2.NYU, Courant Inst Math Sci, New York, NY USA; 3.New York Univ Abu Dhabi, Ctr Prototype Climate Modeling, Abu Dhabi, U Arab Emirates |
推荐引用方式 GB/T 7714 | Yamada, Ray,Pauluis, Olivier. Wave-Mean-Flow Interactions in Moist Baroclinic Life Cycles[J]. JOURNAL OF THE ATMOSPHERIC SCIENCES,2017,74(7). |
APA | Yamada, Ray,&Pauluis, Olivier.(2017).Wave-Mean-Flow Interactions in Moist Baroclinic Life Cycles.JOURNAL OF THE ATMOSPHERIC SCIENCES,74(7). |
MLA | Yamada, Ray,et al."Wave-Mean-Flow Interactions in Moist Baroclinic Life Cycles".JOURNAL OF THE ATMOSPHERIC SCIENCES 74.7(2017). |
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