 |
| Titel |
Tropical cyclone genesis in the Southern Hemisphere and its relationship with the ENSO |
| VerfasserIn |
Y. Kuleshov, F. Chane Ming, L. Qi, I. Chouaibou, C. Hoareau, F. Roux |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
0992-7689
|
| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 27, no. 6 ; Nr. 27, no. 6 (2009-06-24), S.2523-2538 |
| Datensatznummer |
250016565
|
| Publikation (Nr.) |
 copernicus.org/angeo-27-2523-2009.pdf |
|
|
|
|
|
| Zusammenfassung |
| Tropical cyclogenesis climatology over the South Indian and South Pacific
Oceans has been developed using a new tropical cyclone (TC) archive for the
Southern Hemisphere, and changes in geographical distribution of areas
favourable for TC genesis related to changes in the El Niño-Southern
Oscillation (ENSO) phases have been investigated. To explain these changes,
large-scale environmental variables which influence TC genesis and
development such as sea surface temperatures (SSTs), relative humidity in
mid-troposphere, vertical wind shear and lower tropospheric vorticity have
been examined. In the South Indian Ocean, reduction of TC genesis in the
western part of the basin and its increase in the eastern part as well as
displacement of the area favourable for TC genesis further away from the
equator during La Niña events compared to El Niño events can be
explained by changes in geographical distribution of relative humidity and
vorticity across the basin as primary contributors; positive anomalies of
SSTs observed during La Niña seasons in the eastern part of the basin
additionally contribute to enhanced cyclogenesis near the Western Australia.
In the South Pacific Ocean, changes in geographical distribution of relative
humidity and vorticity appear to be the key large-scale environmental
factors responsible for enhanced TC genesis in the eastern (western) part of the
basin as well as for the northeast (southwest) shift of points of cyclogenesis during
El Niño (La Niña) events, with vertical wind shear and SSTs as additional
contributing large-scale environmental variables. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|