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DOI | 10.1175/JAS-D-19-0021.1 |
Effects of Moisture in a Two-Layer Model of the Midlatitude Jet Stream | |
Bembenek, Eric; Straub, David N.; Merlis, Timothy M. | |
2020 | |
发表期刊 | JOURNAL OF THE ATMOSPHERIC SCIENCES |
ISSN | 0022-4928 |
EISSN | 1520-0469 |
出版年 | 2020 |
卷号 | 77期号:1页码:131-147 |
文章类型 | Article |
语种 | 英语 |
国家 | Canada |
英文摘要 | The effects of moisture on the energetics of a statistically stationary, baroclinically unstable jet representing the midlatitude atmosphere are examined using a two-layer, beta-plane shallow-water model. Flow is driven by a relaxation of the interface between the two layers to a baroclinically unstable profile. Moisture is input to the lower layer by evaporation. When supersaturation occurs, precipitation is triggered and the related latent heat release drives a mass transfer between the two layers. A comparison between dry and moist reference atmospheres shows that precipitation reduces eddy kinetic energy. This is related to the meridional distribution of precipitation, which occurs on the poleward side of the jet (where the interface field is raised). This latitudinal structure of precipitation is related to a correlation between poleward flow and ascent, which is analyzed using a shallow-water analog to the omega equation. The precipitation effect on the energy budget is predominately due to zonal- and time-averaged terms. Because of this, dry simulations in which the thermal forcing is modified to mimic the effect of zonally averaged precipitation are carried out and compared with their precipitating counterparts. These simulations show a similar reduction of baroclinic eddy kinetic energy; however, the barotropic eddy kinetic energy response shows a larger difference. |
英文关键词 | Baroclinic flows Eddies Nonlinear dynamics Shallow-water equations Precipitation |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000501238300003 |
WOS关键词 | LIFE-CYCLE ; EXTRATROPICAL JET ; POLEWARD SHIFT ; STORM TRACKS ; CLIMATE ; SIMULATIONS ; ENERGETICS ; ENERGY ; PRECIPITATION ; TEMPERATURE |
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/280251 |
专题 | 地球科学 |
作者单位 | McGill Univ, Dept Atmospher & Ocean Sci, Montreal, PQ, Canada |
推荐引用方式 GB/T 7714 | Bembenek, Eric,Straub, David N.,Merlis, Timothy M.. Effects of Moisture in a Two-Layer Model of the Midlatitude Jet Stream[J]. JOURNAL OF THE ATMOSPHERIC SCIENCES,2020,77(1):131-147. |
APA | Bembenek, Eric,Straub, David N.,&Merlis, Timothy M..(2020).Effects of Moisture in a Two-Layer Model of the Midlatitude Jet Stream.JOURNAL OF THE ATMOSPHERIC SCIENCES,77(1),131-147. |
MLA | Bembenek, Eric,et al."Effects of Moisture in a Two-Layer Model of the Midlatitude Jet Stream".JOURNAL OF THE ATMOSPHERIC SCIENCES 77.1(2020):131-147. |
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