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The Tibetan Plateau, noted for its unique thermodynamic environment, hosts frequent deep convection activities. Recent studies by Dr. Ying Na of Wuxi University and Dr. Chaofan Li of the Institute of Atmospheric Physics, Chinese Academy of Sciences, have shifted focus from commonly observed mesoscale convective systems to isolated deep convection (IDC) phenomena in the region. Their research, co by Simon Mansfield
Sydney, Australia (SPX) Apr 11, 2024
The Tibetan Plateau, noted for its unique thermodynamic environment, hosts frequent deep convection activities. Recent studies by Dr. Ying Na of Wuxi University and Dr. Chaofan Li of the Institute of Atmospheric Physics, Chinese Academy of Sciences, have shifted focus from commonly observed mesoscale convective systems to isolated deep convection (IDC) phenomena in the region. Their research, conducted from June to September between 2001 and 2020, utilizes high-resolution satellite data to explore IDC characteristics.
IDCs are predominantly observed in the southern Tibetan Plateau with the seasonal number fluctuating between 10 and 140 instances, averaging at 54.2. These convections follow a distinct daily pattern, peaking in the early afternoon and significantly declining by late morning, a cycle influenced by the plateau's solar heating effects. Remarkably, about 90% of IDCs dissipate within five hours and cover an average cold cloud area of 7,422.9 km, with 65% of this expanse actively precipitating.
Despite their smaller scale compared to larger storm systems, IDCs are pivotal in their hydrological impact on the region. They are responsible for up to 30%-40% of extreme precipitation events and about 20%-30% of the total rainfall during the season. Some locales receive as much as 70% of their July and August rainfall from IDCs. Dr. Li highlights the significant role of IDCs, surpassing that of larger storm systems in influencing regional precipitation patterns.
The detailed examination of IDCs not only aids in enhancing weather prediction accuracy but also plays a critical role in disaster mitigation strategies. The performance of current weather models in replicating IDC behaviors is also a key area of ongoing research.
Research Report:Isolated deep convections over the Tibetan Plateau in the rainy season during 2001-2020
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Institute of Atmospheric Physics, Chinese Academy of Sciences
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