Characteristics of mesoscale vortices over China in 2015
| Autor: | Jisong Sun, Yinong Pan, Yu Shu |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Convection
geography Mesoscale convective system Plateau geography.geographical_feature_category 010504 meteorology & atmospheric sciences Mesoscale meteorology 02 engineering and technology 021001 nanoscience & nanotechnology Mesocyclone Atmospheric sciences 01 natural sciences Vortex Physics::Fluid Dynamics Condensed Matter::Superconductivity Mesoscale convective vortex 0210 nano-technology Physics::Atmospheric and Oceanic Physics Geology 0105 earth and related environmental sciences |
| Zdroj: | Journal of Meteorological Research. 31:1149-1160 |
| ISSN: | 2198-0934 2095-6037 |
| DOI: | 10.1007/s13351-017-7639-4 |
| Popis: | Mesoscale vortices, which appear at middle and lower levels of rainstorms, are cyclonic circulations with a size ranging from tens of kilometers to several hundred kilometers. Mesoscale vortices often have close relationships with convective activities. The ERA-Interim dataset and an automatic vortex-searching method were used to identify the mesoscale vortices occurring over China in 2015 and their basic characteristics were analyzed. The mesoscale vortices are divided into three categories: mesoscale convective vortices, mesoscale stratiform vortices, and mesoscale dry vortices. The mesoscale convective vortices have the largest intensity, size, and duration, whereas the mesoscale dry vortices have the smallest. Mesoscale convective vortices are able to form in any direction of the parent mesoscale convective system, although the secondary convection tends to appear to the southeast of the parent vortices. The mesoscale vortices tend to generate in the transition area between high and low altitudes. The leeward side of the Tibetan Plateau is the main source region of mesoscale vortices in China. Most of vortices are generated at midday and midnight. The activities of mesoscale convective vortices and mesoscale stratiform vortices peak in summer, whereas those of the mesoscale dry vortices peak in winter. |
| Databáze: | OpenAIRE |
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