As shown in comparison and study of the HIRS-Tb12 data and conventional data, temperature, humidity and vertical motion are structured differently in the Southern and Northern Hemispheres, which are well depicted with...As shown in comparison and study of the HIRS-Tb12 data and conventional data, temperature, humidity and vertical motion are structured differently in the Southern and Northern Hemispheres, which are well depicted with the HIRS-Tb12 data. When high pressures rapidly decrease over the regions of South China Sea and Arabian Sea with the HIRS-Tb12 less than 200 W/m2, monsoons will set off in the South China Sea, Arabian Sea and Bay of Bengal, respectively. From a year of significant drought to one of significant floods, the trend of evolution is significantly different in the downdraft areas of the subtropical highs between the two hemispheres.展开更多
Two record-breaking rainfalls in late June of 2015 led to widespread flooding in Eastern China, espe- cially over the Yangtze River Delta, and this in turn led to huge economic losses. Analysis suggests that the E1 Ni...Two record-breaking rainfalls in late June of 2015 led to widespread flooding in Eastern China, espe- cially over the Yangtze River Delta, and this in turn led to huge economic losses. Analysis suggests that the E1 Nifio- like sea surface temperature pattern during that month facilitated an intensified and southwestward-shifted west- ern Pacific subtropical high and enhanced water vapor convergence along the Meiyu front, which provided a favorable environment for the occurrence of heavy rainfall over Eastern China. Meanwhile, two midlatitude troughs were successively formed over East Asia in the second half of the month as a consequence of the downstream energy dispersions of two midlatitude blockings. These configu- rations facilitated the southward intrusion of the extrat- ropical high potential vorticity toward the Meiyu front. In this way, the ascent was enhanced along the Meiyu front over Eastern China, and the occurrence of heavy rainfalls was triggered. Moreover, a tropical intraseasonal active convection propagated northward and also contributed constructively to the heavy rainfall.展开更多
基金Essential Scientific Research Project in the national 9th five-year development plan (96-908-05-06-08)
文摘As shown in comparison and study of the HIRS-Tb12 data and conventional data, temperature, humidity and vertical motion are structured differently in the Southern and Northern Hemispheres, which are well depicted with the HIRS-Tb12 data. When high pressures rapidly decrease over the regions of South China Sea and Arabian Sea with the HIRS-Tb12 less than 200 W/m2, monsoons will set off in the South China Sea, Arabian Sea and Bay of Bengal, respectively. From a year of significant drought to one of significant floods, the trend of evolution is significantly different in the downdraft areas of the subtropical highs between the two hemispheres.
基金supported by the National Basic Research Program of China(2013CB430203)the National Natural Science Foundation of China(4123052741422501)
文摘Two record-breaking rainfalls in late June of 2015 led to widespread flooding in Eastern China, espe- cially over the Yangtze River Delta, and this in turn led to huge economic losses. Analysis suggests that the E1 Nifio- like sea surface temperature pattern during that month facilitated an intensified and southwestward-shifted west- ern Pacific subtropical high and enhanced water vapor convergence along the Meiyu front, which provided a favorable environment for the occurrence of heavy rainfall over Eastern China. Meanwhile, two midlatitude troughs were successively formed over East Asia in the second half of the month as a consequence of the downstream energy dispersions of two midlatitude blockings. These configu- rations facilitated the southward intrusion of the extrat- ropical high potential vorticity toward the Meiyu front. In this way, the ascent was enhanced along the Meiyu front over Eastern China, and the occurrence of heavy rainfalls was triggered. Moreover, a tropical intraseasonal active convection propagated northward and also contributed constructively to the heavy rainfall.
