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DOI | 10.1175/JCLI-D-16-0400.1 |
Downward Wave Reflection as a Mechanism for the Stratosphere-Troposphere Response to the 11-Yr Solar Cycle | |
Lu, Hua1; Scaife, Adam A.2; Marshall, Gareth J.1; Turner, John1; Gray, Lesley J.3 | |
2017-04-01 | |
发表期刊 | JOURNAL OF CLIMATE
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ISSN | 0894-8755 |
EISSN | 1520-0442 |
出版年 | 2017 |
卷号 | 30期号:7 |
文章类型 | Article |
语种 | 英语 |
国家 | England |
英文摘要 | The effects of solar activity on the stratospheric waveguides and downward reflection of planetary waves during NH early to midwinter are examined. Under high solar (HS) conditions, enhanced westerly winds in the subtropical upper stratosphere and the associated changes in the zonal wind curvature led to an altered waveguide geometry across the winter period in the upper stratosphere. In particular, the condition for barotropic instability was more frequently met at 1 hPa near the polar-night jet centered at about 55 degrees N. In early winter, the corresponding change in wave forcing was characterized by a vertical dipole pattern of the Eliassen-Palm (E-P) flux divergent anomalies in the high-latitude upper stratosphere accompanied by poleward E-P flux anomalies. These wave forcing anomalies corresponded with negative vertical shear of zonal mean winds and the formation of a vertical reflecting surface. Enhanced downward E-P flux anomalies appeared below the negative shear zone; they coincided with more frequent occurrence of negative daily heat fluxes and were associated with eastward acceleration and downward group velocity. These downward-reflected wave anomalies had a detectable effect on the vertical structure of planetary waves during November-January. The associated changes in tropospheric geopotential height contributed to a more positive phase of the North Atlantic Oscillation in January and February. These results suggest that downward reflection may act as a `` top down'' pathway by which the effects of solar ultraviolet (UV) radiation in the upper stratosphere can be transmitted to the troposphere. |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000399678400007 |
WOS关键词 | INTERANNUAL VARIABILITY ; UV-RADIATION ; MODEL ; INDEX ; QBO |
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/20747 |
专题 | 气候变化 |
作者单位 | 1.British Antarctic Survey, Cambridge, England; 2.Met Off Hadley Ctr, Exeter, Devon, England; 3.Univ Oxford, Clarendon Lab, Dept Atmospher Phys, NCAS Climate, Oxford, England |
推荐引用方式 GB/T 7714 | Lu, Hua,Scaife, Adam A.,Marshall, Gareth J.,et al. Downward Wave Reflection as a Mechanism for the Stratosphere-Troposphere Response to the 11-Yr Solar Cycle[J]. JOURNAL OF CLIMATE,2017,30(7). |
APA | Lu, Hua,Scaife, Adam A.,Marshall, Gareth J.,Turner, John,&Gray, Lesley J..(2017).Downward Wave Reflection as a Mechanism for the Stratosphere-Troposphere Response to the 11-Yr Solar Cycle.JOURNAL OF CLIMATE,30(7). |
MLA | Lu, Hua,et al."Downward Wave Reflection as a Mechanism for the Stratosphere-Troposphere Response to the 11-Yr Solar Cycle".JOURNAL OF CLIMATE 30.7(2017). |
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