Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1002/2017JD026597 |
A climatology of Rossby wave generation in the middle atmosphere of the Southern Hemisphere from MERRA reanalysis | |
Rodas, Claudio1; Pulido, Manuel1,2,3 | |
2017-09-16 | |
发表期刊 | JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
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ISSN | 2169-897X |
EISSN | 2169-8996 |
出版年 | 2017 |
卷号 | 122期号:17 |
文章类型 | Article |
语种 | 英语 |
国家 | Argentina |
英文摘要 | A climatological characterization of Rossby wave generation events in the middle atmosphere of the Southern Hemisphere is conducted using 20 years of Modern-Era Retrospective Analysis for Research and Applications (MERRA) reanalysis. An automatic detection technique of wave generation events is developed and applied to MERRA reanalysis. The Rossby wave generation events with wave period of 1.25 to 5.5 days and zonal wave number from one to three dominate the Eliassen-Palm flux divergence around the stratopause at high latitudes in the examined 20 year period. These produce an eastward forcing of the general circulation between May and mid-August in that region. Afterward from mid-August to the final warming date, Rossby wave generation events are still present but the Eliassen-Palm flux divergence in the polar stratopause is dominated by low-frequency Rossby waves that propagate from the troposphere. The Rossby wave generation events are associated with potential vorticity gradient inversion, and so they are a manifestation of the dominant barotropic/ baroclinic unstable modes that grow at the cost of smearing the negative meridional gradient of potential vorticity. The most likely region of wave generation is found between 60 degrees and 80 degrees S and at a height of 0.7 hPa, but events were detected from 40 hPa to 0.3 hPa (which is the top of the examined region). The mean number of events per year is 24, and its mean duration is 3.35 days. The event duration follows an exponential distribution. |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000416387300002 |
WOS关键词 | 4-DAY WAVE ; DATA ASSIMILATION ; PLANETARY-WAVES ; LOWER THERMOSPHERE ; CIRCULATION ; MESOSPHERE ; DRAG ; STRATOSPHERE ; INSTABILITY ; MODELS |
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/32304 |
专题 | 气候变化 |
作者单位 | 1.Univ Nacl Nordeste, FACENA, Dept Phys, Corrientes, Argentina; 2.CNRS, UMI, IFAECI, Corrientes, Argentina; 3.Consejo Nacl Invest Cient & Tecn, IMIT, Corrientes, Argentina |
推荐引用方式 GB/T 7714 | Rodas, Claudio,Pulido, Manuel. A climatology of Rossby wave generation in the middle atmosphere of the Southern Hemisphere from MERRA reanalysis[J]. JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,2017,122(17). |
APA | Rodas, Claudio,&Pulido, Manuel.(2017).A climatology of Rossby wave generation in the middle atmosphere of the Southern Hemisphere from MERRA reanalysis.JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,122(17). |
MLA | Rodas, Claudio,et al."A climatology of Rossby wave generation in the middle atmosphere of the Southern Hemisphere from MERRA reanalysis".JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES 122.17(2017). |
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