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| Titel |
A case study of extreme rainfall along the eastern coast of Hainan Island in October 2010 |
| VerfasserIn |
Huijie Wang, Jianhua Sun, Sixiong Zhao |
| Konferenz |
EGU General Assembly 2013
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 15 (2013) |
| Datensatznummer |
250075572
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| Zusammenfassung |
| A multiscale analysis is conducted using multiple observational data and NECP reanalysis data, together with WRF model simulation to examine the physical processes that resulted in extremely heavy rainfall over the eastern coast of Hainan Island on 5 October 2010, during which Qionghai station received 701.9 mm of rainfall in 24 hours. On the synoptic scale, heavy rainfall was under the influence of both cold air invasion from midlatitudes and tropical depression over South China Sea. There was a mesoscale convective zone along the eastern coast of Hainan Island, on which active meso-β convective systems (MCS) originated from the back-building area and developed from south to north. Once the MCS moved closer to Qionghai, it developed strongly, and accompanied by the easterly low-level jet (LLJ) intensification. The calculation of vorticity budget and moist Froude number revealed that the intensification of LLJ resulted in stronger vertical wind shear and larger tilting term. The mesoscale topography in the middle of Hainan Island are favorable for the MCSs formation and maintenance when the MCSs move close to its northeastern slope, where under medium topographic Fw value, the flows around the topography were lifted up, so that the horizontal vorticity transferred to vertical vorticity through tilting term, and the topographic blocking effect slows down the MCSs movement, which is beneficial to the formation of the extreme rainfall upstream. |
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