| Autor: |
UEDA, Manabu, MUKOUGAWA, Hitoshi, KODERA, Kunihiko, NOGUCHI, Shunsuke |
| Jazyk: |
japonština |
| Rok vydání: |
2016 |
| Předmět: |
|
| Zdroj: |
京都大学防災研究所年報. B. 59:168-179 |
| ISSN: |
0386-412X |
| Popis: |
An analysis method to detect emanation regions and the associated emanation period of planetary wave (PW) packets inducing the sudden stratospheric warming (SSW) is developed. The method traces a 3D wave ray of a PW packet based on its group velocity computed from the 3D wave activity flux for stationary PWs defined by Plumb. By applying the method to a SSW event occurred in December 2001, we detect two key circulation anomalies near the tropopause, from which PW packets propagate efficiently into the stratosphere and subsequently cause the SSW: one is a blocking in the North Atlantic, the other is a cyclonic anomaly residing in East Asia and the North Pacific. The important role of the latter anomaly for the occurrence of the SSW is firstly recognized in our study. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
|
