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DOI | 10.1175/JAS-D-17-0283.1 |
Influence of Midlatitude Surface Thermal Anomalies on the Polar Midtroposphere in an Idealized Moist Model | |
Fajber, Robert1; Kushner, Paul J.1; Laliberte, Frederic2 | |
2018-04-01 | |
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:4页码:1089-1104 |
文章类型 | Article |
语种 | 英语 |
国家 | Canada |
英文摘要 | Evidence from models and observations suggests that the vertical distribution of entropy in the extratropical troposphere reflects the horizontal distribution of entropy at the surface. This isentropic linkage, which is accomplished through moist isentropic mass transport driven by extratropical waves, becomes more apparent when the effect of latent heat release by condensing moist parcels is accounted for. This study focuses on the stratification of the Arctic troposphere, which is connected by moist isentropes to the midlatitude surface. A relatively simple moist general circulation model without radiative feedbacks involving water vapor or clouds is used to study the linkage between the midlatitude surface and the Arctic midtroposphere. Zonally symmetric midlatitude thermal perturbations switched on at the surface drive a moist potential temperature response in the Arctic midtroposphere with a lag of about 2 weeks. This response increases the gross moist vertical stability in the Arctic while generally decreasing it, or increasing it only weakly, in the midlatitudes. The moist isentropic streamfunction is shifted poleward owing to the poleward entropy flux response and is shifted upward (i.e., to higher entropy) owing to the zonal-mean entropy response. The results suggest a potential novel mechanism by which the midlatitudes might influence polar lapse rates and their associated radiative feedbacks. |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000430749000005 |
WOS关键词 | GLOBAL ATMOSPHERIC CIRCULATION ; GENERAL-CIRCULATION ; STATIC STABILITY ; PART I ; TEMPERATURE ; GCM ; STRATIFICATION ; AMPLIFICATION ; TROPOSPHERE ; CONVECTION |
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/29543 |
专题 | 地球科学 |
作者单位 | 1.Univ Toronto, Dept Phys, Toronto, ON, Canada; 2.Environm & Climate Change Canada, Climate Change Res Div, Toronto, ON, Canada |
推荐引用方式 GB/T 7714 | Fajber, Robert,Kushner, Paul J.,Laliberte, Frederic. Influence of Midlatitude Surface Thermal Anomalies on the Polar Midtroposphere in an Idealized Moist Model[J]. JOURNAL OF THE ATMOSPHERIC SCIENCES,2018,75(4):1089-1104. |
APA | Fajber, Robert,Kushner, Paul J.,&Laliberte, Frederic.(2018).Influence of Midlatitude Surface Thermal Anomalies on the Polar Midtroposphere in an Idealized Moist Model.JOURNAL OF THE ATMOSPHERIC SCIENCES,75(4),1089-1104. |
MLA | Fajber, Robert,et al."Influence of Midlatitude Surface Thermal Anomalies on the Polar Midtroposphere in an Idealized Moist Model".JOURNAL OF THE ATMOSPHERIC SCIENCES 75.4(2018):1089-1104. |
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