華南夏季持續(xù)性強(qiáng)降水的低頻特征及影響因子分析
[Abstract]:Using the daily precipitation data of the China Meteorological Observation Station in the summer of 1982-2011 years, the daily mean data of NCEP/NCAR global reanalysis, the OLR data set by NOAA and the SST data of the sea surface temperature, and the RMM-MJO (Real-time Multivariate MJO) index of the Australian Bureau of meteorology, and the method of selecting low frequency precipitation events, are investigated. The basic statistical characteristics of the persistent strong precipitation of 12-30d in Southern China in summer are analyzed. Then the low frequency atmospheric circulation and the source and propagation of low frequency signals are analyzed with the method of phase synthesis in the summer of Southern China, and the low frequency sea air coupling process and the tropical MJO (Madden-Julian Oscillation) are also analyzed. The main conclusions are as follows: (1) the summer precipitation in Southern China has the characteristics of significant 12-30d low frequency oscillation, and the large value area of precipitation and precipitation intensity is concentrated in the southeast coastal areas of Southern China. The duration of persistent strong water drop events is 3-6 days, which is held in Southern China. The last 3-4 days of events are most, the precipitation of the last 4 days of the event accounts for the largest proportion of the total low frequency precipitation event precipitation. The end period of the pre flood period (June) is the most likely time period for the persistent strong precipitation of 12-30d in summer in Southern China. The rain belt during the persistent strong rainfall is promoted from the southeast coast to the northwest inland. (2) the persistent strong precipitation of 12-30d in summer in the summer of Southern China. During the period, the low floor of Southern China and its adjacent sea area is controlled by a strong low-frequency cyclonic circulation, the low frequency rising movement is significant, while the South China Sea and the Philippines sea is a strong low-frequency anticyclone circulation, and the northward low frequency water vapor transport to the north of the west side of the West Bengal and the South China Sea continuously converge to the Southern China and the adjacent sea area. Low frequency signals are derived from the northwestward propagation of low frequency oscillations in the tropical western Pacific and the South China Sea and the Philippines sea, along with the low frequency variation of the Western Pacific subtropical high in the West extension and eastward contraction. At the high level, when the persistent strong precipitation occurs, the north side of Southern China (22 -45 N, 95 -130 E) is strong. The large low-frequency cyclonic circulation and the low frequency anticyclonic circulation in the bay of Bengal - South China Sea make the Southern China high rise in the strong divergence field, thus strengthening the low level convergence and low frequency rising movement, resulting in the enhancement and maintenance of persistent strong precipitation. The low frequency signal of the high rise is derived from the low frequency of cyclone and anticyclone. (3) in the whole process of low frequency precipitation, (3) in the whole process of low frequency precipitation, with the evolution of low frequency circulation, the sea surface temperature anomaly (SSTA) also has obvious low frequency changes, and the evolution of sea surface temperature and the evolution of the low atmospheric ring flow field present the near PI /2 phase difference, that is, the low frequency sea air interaction. Low frequency atmospheric ring. The flow anomaly can change the low frequency SSTA through the process of cloud radiation and heat flux, and the low frequency SSTA that is forced by the atmosphere can exert a significant feedback effect on the atmosphere by affecting the stability of the lower atmosphere. The low frequency sea air coupling process is beneficial to the low frequency signals of the lower atmosphere to spread to the Southern China region, thus affecting the summer 12-30d in Southern China. The occurrence, development and end of persistent strong precipitation. (4) the propagation of tropical strong MJO has a distinct modulation effect on the persistent strong precipitation of 12-30d in Southern China in summer. When the MJO convective active center is located in the tropical India ocean (that is, the 1-3 phase of strong MJO), the accompanying atmospheric anomalous annular flow field is beneficial to the persistent strong precipitation of 12-30d in Southern China in summer. Especially in the first phase of the strong MJO, the West Pacific subtropical high extends north and extends northward, and there is a significant positive anomaly over the western tropical Pacific Ocean, with a strong anomalous anticyclone circulation, and the strong anomalous southwest wind in the northwest side controls the low level of the whole Southern China region, causing the strongest southwestern Fengshui to the Southern China region. In Southern China area, there is obvious anomalous water vapor convergence and significant rising movement in Southern China area. Convection develops strongly, which leads to the largest number of strong MJO first phases in the summer of Southern China in summer, which is the most favorable phase for Southern China's summer 12-30d persistent strong descending water, when MJO convection center enters West Taiping. After ocean (that is, the 5-7 phase of strong MJO), the anomalous atmospheric circulation field produced is not conducive to the occurrence of persistent strong precipitation of 12-30d in Southern China in summer, especially in the seventh phase of strong MJO, and the anomalous circulation pattern is basically opposite to the first phase. In summer, the number of days of persistent strong precipitation of 12-30d in the strong MJO seventh phases is the least.
【學(xué)位授予單位】:南京大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2017
【分類(lèi)號(hào)】:P426.6
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