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| Content Provider | Springer Nature Link |
|---|---|
| Author | Liu, Chengji Ren, Xuejuan Yang, Xiuqun |
| Copyright Year | 2014 |
| Abstract | The features of large-scale circulation, storm tracks and the dynamical relationship between them were examined by investigating Rossby wave breaking (RWB) processes associated with Eastern Pacific (EP) and Central Pacific (CP) El-Niño. During EP El-Niño, the geopotential height anomaly at 500 hPa (Z500) exhibits a Pacific-North America (PNA) pattern. During CP El-Niño, the Z500 anomaly shows a north positive-south negative pattern over the North Pacific. The anomalous distributions of baroclinicity and storm track are consistent with those of upper-level zonal wind for both EP and CP El-Niño, suggesting impacts of mean flow on storm track variability. Anticyclonic wave breaking (AWB) occurs less frequently in EP El-Niño years, while cyclonic wave breaking (CWB) occurs more frequently in CP El-Niño years over the North Pacific sector. Outside the North Pacific, more CWB events occur over North America during EP El-Niño.When AWB events occur less frequently over the North Pacific during EP El-Niño, Z500 decreases locally and the zonal wind is strengthened (weakened) to the south (north). This is because AWB events reflect a monopole high anomaly at the centroid of breaking events. When CWB events occur more frequently over the North Pacific under CP El-Niño conditions, and over North America under EP El-Niño condition, Z500 increases (decreases) to the northeast (southwest), since CWB events are related to a northeast-southwest dipole Z500 anomaly. The anomalous RWB events act to invigorate and reinforce the circulation anomalies over the North Pacific-North America region linked with the two types of El-Niño. |
| Starting Page | 197 |
| Ending Page | 210 |
| Page Count | 14 |
| File Format | |
| ISSN | 02561530 |
| Journal | Advances in Atmospheric Sciences |
| Volume Number | 31 |
| Issue Number | 1 |
| e-ISSN | 18619533 |
| Language | English |
| Publisher | Springer Berlin Heidelberg |
| Publisher Date | 2013-12-20 |
| Publisher Place | Berlin, Heidelberg |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | central Pacific El-Niño eastern Pacific El-Niño large-scale circulation storm track Rossby wave breaking Atmospheric Sciences Meteorology Geophysics/Geodesy |
| Content Type | Text |
| Resource Type | Article |
| Subject | Atmospheric Science |
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