Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1175/JAS-D-16-0343.1 |
Mechanisms for a PNA-Like Teleconnection Pattern in Response to the MJO | |
Seo, Kyong-Hwan; Lee, Hyun-Ju | |
2017-06-01 | |
发表期刊 | JOURNAL OF THE ATMOSPHERIC SCIENCES |
ISSN | 0022-4928 |
EISSN | 1520-0469 |
出版年 | 2017 |
卷号 | 74期号:6 |
文章类型 | Article |
语种 | 英语 |
国家 | South Korea |
英文摘要 | Kinematic mechanisms of the Pacific-North America (PNA)-like teleconnection pattern induced by the Madden-Julian oscillation (MJO) is examined using an atmospheric general circulation model (GCM) and a barotropic Rossby wave theory. Observation shows that a negative PNA-like teleconnection pattern emerges in response to MJO phase-2 forcing with enhanced (suppressed) convection located over the Indian (western Pacific) Ocean. The GCM simulations show that both forcing anomalies contribute to creating the PNA-like pattern. Indian Ocean forcing induces two major Rossby wave source (RWS) regions: a negative region around southern Asia and a positive region over the western North Pacific (WNP). The negative RWS to the north of the enhanced convection in the Indian Ocean arises from southerly MJO-induced divergent wind crossing the Asian jet. Unexpectedly, another significant RWS region develops over the WNP owing to refracted northerly divergent wind. A ray-tracing method demonstrates three different ways of wave propagation emanating from the RWS to the PNA region: 1) direct arclike propagation from the negative RWS to the PNA region occurs in the longest waves, 2) shorter waves are displaced first downstream by the jet waveguide effect and then emanate at the jet exit to the PNA region, and 3) waves with zonal wavenumbers 1 and 2 exhibit canonical wave propagation from the positive RWS at the jet exit to the PNA region. On the other hand, the positive RWS induced by western Pacific forcing shows similar characteristics to feature 3 described above, with some relaxation such that much shorter waves also contribute to the formation of the southern cells. |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000403101200006 |
WOS关键词 | MADDEN-JULIAN OSCILLATION ; NORTHERN-HEMISPHERE WINTER ; FREQUENCY FLOW INTERACTION ; KINETIC-ENERGY ; FORECAST SYSTEM ; SYNOPTIC EDDY ; STORM TRACKS ; ATMOSPHERE ; DIVERGENT ; DYNAMICS |
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/29639 |
专题 | 地球科学 |
作者单位 | Pusan Natl Univ, Dept Atmospher Sci, Div Earth Environm Syst, Busan, South Korea |
推荐引用方式 GB/T 7714 | Seo, Kyong-Hwan,Lee, Hyun-Ju. Mechanisms for a PNA-Like Teleconnection Pattern in Response to the MJO[J]. JOURNAL OF THE ATMOSPHERIC SCIENCES,2017,74(6). |
APA | Seo, Kyong-Hwan,&Lee, Hyun-Ju.(2017).Mechanisms for a PNA-Like Teleconnection Pattern in Response to the MJO.JOURNAL OF THE ATMOSPHERIC SCIENCES,74(6). |
MLA | Seo, Kyong-Hwan,et al."Mechanisms for a PNA-Like Teleconnection Pattern in Response to the MJO".JOURNAL OF THE ATMOSPHERIC SCIENCES 74.6(2017). |
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