期刊
ADVANCES IN ATMOSPHERIC SCIENCES
卷 32, 期 5, 页码 601-612出版社
SCIENCE PRESS
DOI: 10.1007/s00376-014-4099-y
关键词
subtropical westerly jet waveguide; southern China rainstorm; Rossby wave; India-Burma trough; North Atlantic Oscillation
资金
- National Natural Science Foundation of China (NSFC) [41276002, 41130859]
- National Basic Research Program of China [2012CB955603, 2013CB956201]
- NSFC-Shandong Joint Fund for Marine Science Research Centers [U1406401]
- Fund for Open Research Programs of the Key Laboratory of Meteorological Disaster (Nanjing University of Information Science and Technology), Ministry of Education [KLME1301]
An extreme rainstorm hit southern China during 13-17 December 2013, with a record-breaking daily rainfall rate, large spatial extent, and unusually long persistence. We examined what induced this heavy rainfall process, based on observed rainfall data and NCEP-NCAR reanalysis data through composite and diagnostic methods. The results showed that a Rossby waveguide within the subtropical westerly jet caused the event. The Rossby wave originated from strong cold air intrusion into the subtropical westerly jet over the eastern Mediterranean. With the enhancement and northward shift of the Middle East westerly jet, the Rossby wave propagated slowly eastward and deepened the India-Burma trough, which transported a large amount of moisture from the Bay of Bengal and South China Sea to southern China. Strong divergence in the upper troposphere, caused by the enhancement of the East Asian westerly jet, also favored the heavy rainfall process over Southeast China. In addition, the Rossby wave was associated with a negative-to-positive phase shift and enhancement of the North Atlantic Oscillation, but convergence in the eastern Mediterranean played the key role in the eastward propagation of the Rossby wave within the subtropical westerly jet.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据