江淮下游地區(qū)強(qiáng)對(duì)流發(fā)生條件的實(shí)況分析與模擬
[Abstract]:There are many severe convective weather in China, and the severe convective disasters in the lower reaches of Jianghuai River and Huaihe River are frequent, which has caused huge economic losses and casualties to our country. At present, the prediction of severe convective weather is still difficult, and the specific position and time of predicting the occurrence of severe convective is one of the most challenging problems in the prediction of severe convective weather. From the point of view of case analysis, this paper focuses on the trigger mechanism of severe convective weather in the lower reaches of Jianghuai River and Huai River through the actual situation and simulation analysis of several cases. Based on the detailed analysis of the severe convective weather process on June 5, 2009, it is found that there is a meso-scale disturbance convergence center in the southwest flow field of the lower atmosphere in northern Anhui, which triggers the formation of the initial convective clouds in northern Anhui. There is a convergence line formed by the confluence of southwest air flow and westward air flow in northern Anhui Province, which provides a favorable position for convective formation. After the wind field disturbance occurs at the eastern end of the convergence line, it is proved that the convective generation is related to the surface wind field disturbance. The WRF model simulates the process of wind field disturbance and convective trigger in the northern Anhui convergence line and the eastern end of the convergence line. The model results show that the updraft caused by the convergence line is limited to the 3km height. The wind field disturbance at the eastern end of the convergence line is caused by the high-level gravity wave, which is a n = 1 mode gravity wave excited by coastal convection. When the updraft of n = 1 gravity wave intersects the convergence line of northern Anhui, the lower updraft at the intersection increases, which triggers the generation of strong convolution. Combined with different examples, the structural characteristics and trigger effect of n = 1 gravity wave are analyzed. N = 1 gravity wave is composed of a pair of sinking-updraft airflow with a depth of about 12km, which runs through the whole tropospheric layer, and the vertical velocity center of subsidence-updraft flow is located at 6km. The upper part of the sinking (ascending) airflow corresponds to the horizontal convergence (divergence) region, and the lower part corresponds to the horizontal divergence (convergence) region. N = 1 the gravity wave forms a low pressure disturbance on the ground. The pressure drop (rise) stage of low pressure disturbance is caused by subsidence and heating (rising cooling), and the propagation speed is about 30 m / s. The low pressure part of the front of the squall line is caused by the downdraft of the n = 1 gravity wave. The updraft of the n = 1 gravity wave is stronger than the downdraft. There will be an incremental disturbance of wind component in the direction of gravity wave propagation in the surface wind field. During the severe convective weather on June 14, 2009, the squall line excited the n = 1 gravity wave and intersected with the shallow cloud belt in front of the squall line, which triggered the strong convective generation. In this paper, some typical ground convergence lines in the lower reaches of Jianghuai River and Huaihe River are as follows: 1) the convergence lines formed by airflow around Dabie Mountain, Huangshan Mountain and Tianmu Mountain on the leeward side of the mountain area. 2) the convergence line (including the wind front) formed by the outflow of the convolution in the early stage, and 3) the convergence line near the coast formed by the inland air flow and the air flow from the sea. These convergence lines provide a position conducive to the occurrence of convolution. When the convergence line intersects the convergence line or the convergence line intersects with other systems (such as shallow cloud belt, convective system, gravity wave, etc.), it is easy to form deep convection at the intersection.
【學(xué)位授予單位】:浙江大學(xué)
【學(xué)位級(jí)別】:博士
【學(xué)位授予年份】:2017
【分類號(hào)】:P458.1
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