西北太平洋TC移動(dòng)速度異常及預(yù)報(bào)誤差特征的分析
[Abstract]:Based on the data set of tropical cyclone (TC,Tropical Cyclone) and TC in the northwest Pacific Ocean compiled by the National Meteorological Administration and the Shanghai Typhoon Research Institute (CMA-STI), and the TC path prediction error data from 2005 to 2010, the percentile method is applied. The abnormal index of TC movement velocity is determined, and the temporal and spatial distribution characteristics of TC movement velocity and its variation anomalies in the northwest Pacific in the past 40 years are analyzed. The influence of TC velocity prediction error on path prediction error and its relationship with large scale guided air flow are studied. The results show that: 1) the threshold of 95% (5%) quantile of TC migration velocity and its cumulative probability of velocity variation in the northwest Pacific is 10.8 m 路s ~ (- 1) (1.43 m 路s ~ (- 1) and 2.42 m 路s ~ (- 1), respectively. 1) (- 1.72 m 路s ~ (- 1). 2) most of the fast moving and accelerated TC occurred in the Sea of Japan. The slow and deceleration TC mainly appeared in the South China Sea. 3) the seasonal variation of TC movement speed anomaly showed that the frequency of fast moving TC reached the highest in May, and the frequency of slow moving TC reached the highest in October. The frequency of accelerated TC is the highest in June. 4) the contribution of TC velocity prediction error in recent 6 years to TC path prediction error is about 41.6%. 5) the prediction error of TC path is too large. The analysis of an example with great contribution to the prediction error of moving velocity shows that the weak guided air flow in the large scale environment slows the movement speed of TC. If the predicted large-scale environment leads the airflow to be stronger and the predicted TC shift speed is faster, then it is easy to lead to large path prediction errors.
【作者單位】: 南京信息工程大學(xué)氣象災(zāi)害教育部重點(diǎn)實(shí)驗(yàn)室;南京信息工程大學(xué)太平洋臺(tái)風(fēng)研究中心;
【基金】:國(guó)家自然科學(xué)基金資助項(xiàng)目(41575083;41575108)
【分類(lèi)號(hào)】:P732
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