According to the rainfall data of five national meteorological observation stations in Nanchang from 1990-2019 (including 1990-1998), using statistical method, linear trend and correlation analysis, the rainstorm char...According to the rainfall data of five national meteorological observation stations in Nanchang from 1990-2019 (including 1990-1998), using statistical method, linear trend and correlation analysis, the rainstorm characteristics and trends in Nanchang in 30 years are studied, and the results show that the average annual rainfall in Nanchang gradually decreases by 1.5932 / a;the rainfall in extreme annual rainfall is concentrated, and the southeast rainfall is more than that in the northwest. The average annual rainstorm day in the city is 5.8 days, and the number of rainstorms in each station is obvious, and the frequency of rainstorms in spring and summer is the highest. The average number of annual torrential rains in the city gradually decreased with a trend of 0.0167 / a. The average monthly rainfall was highly correlated with the average number of monthly heavy rains. The beginning and end time span of the rainstorm is relatively large. Rainstorm days are mostly discontinuous and the probability of continuous rainstorm is low. Especially the probability of 3 consecutive days is lower, and there is no rainstorm weather for 4 consecutive days. Rainfall was positively correlated with the number of rainstorms. The year of extreme annual rainfall in each station is concentrated;the annual rainfall is quite different. Overall, the rainfall in the southeast is more than the northwest. Therefore, we make a detailed analysis of the data cycle and time of the rainfall trend in Nanchang in order to make professional contribution to the improvement of the value of meteorological service and provide meteorological analysis suggestions for better production and life.展开更多
文摘According to the rainfall data of five national meteorological observation stations in Nanchang from 1990-2019 (including 1990-1998), using statistical method, linear trend and correlation analysis, the rainstorm characteristics and trends in Nanchang in 30 years are studied, and the results show that the average annual rainfall in Nanchang gradually decreases by 1.5932 / a;the rainfall in extreme annual rainfall is concentrated, and the southeast rainfall is more than that in the northwest. The average annual rainstorm day in the city is 5.8 days, and the number of rainstorms in each station is obvious, and the frequency of rainstorms in spring and summer is the highest. The average number of annual torrential rains in the city gradually decreased with a trend of 0.0167 / a. The average monthly rainfall was highly correlated with the average number of monthly heavy rains. The beginning and end time span of the rainstorm is relatively large. Rainstorm days are mostly discontinuous and the probability of continuous rainstorm is low. Especially the probability of 3 consecutive days is lower, and there is no rainstorm weather for 4 consecutive days. Rainfall was positively correlated with the number of rainstorms. The year of extreme annual rainfall in each station is concentrated;the annual rainfall is quite different. Overall, the rainfall in the southeast is more than the northwest. Therefore, we make a detailed analysis of the data cycle and time of the rainfall trend in Nanchang in order to make professional contribution to the improvement of the value of meteorological service and provide meteorological analysis suggestions for better production and life.
