CAJ | 학술논문

利用风暴尺度、云分辨的数值模式ARPS模拟了1993年2月22日TOGACOARE试验期间在赤道南太平洋观测到一次热带海洋飑线过程的发生发展过程，验证该模式的模拟热带对流系统的能力，并详细地分析了该次飑线的结构特征和动力学形成机制。通过数值敏感性试验研究了不同的云微物理过程对热带飑线的结构和发展演变过程的影响，所考虑的云微物理过程分为包含六种水相态的冰相过程和Kessler暖雨过程。模拟结果表明，云分辨模式ARPS采用合适的物理过程可以较成功地模拟出热带飑线的三维结构及其演变过程。数值敏感性试验结果表明，在对流上升过程中，由于与冻结作用有关的冰相微物理过程能释放更多的潜热，这种潜热能产生垂直方向上的浮力梯度从而较明显地加强系统的深对流，有利于对流系统组织性的对流带的长时间维持；相比之下，暖雨过程中飑线的生命周期缩短，而系统倾斜结构更明显，层状云区的发展比较旺盛。
이용풍폭척도、운분변적수치모식ARPS모의료1993년2월22일TOGACOARE시험 기간재적도남태평양관측도일차열대해양박선과정적발생발전과정，험증해모식적모의열대대류계통적능력，병상세지분석료해차박선적결구특정화동역학형성궤제。통과수치민감성시험연구료불동적운미물리과정대열대박선적결구화발전연변과정적영향，소고필적운미물리과정분위포함륙충수상태적빙상과정화Kessler난우과정。모의결과표명，운분변모식ARPS채용합괄적물리과정가이교성공지모의출열대박선적삼유결구급기연변과정。수치민감성시험결과표명，재대류상승과정중，유우여동결작용유관적빙상미물리과정능석방경다적잠열，저충잠열능산생수직방향상적부력제도종이교명현지가강계통적심대류，유리우대류계통조직성적대류대적장시간유지；상비지하，난우과정중박선적생명주기축단，이계통경사결구경명현，층상운구적발전비교왕성。
The occurrence and evolution of an oceanic tropical squall line observed on 22 February 1993 during TOGA-COARE over the equatorial Pacific Ocean were simulated by use of a three-dimensional,nonhydrostatic storm-scale numerical model ARPS. The capacity of ARPS to simulate such tropical squall line was verified. The structure and dynamic mechanism of the squall line were discussed in details as well.The impacts of the different microphysical process that including the ice phase and warm rain schemes on structure and evolution of the squall line were investigated by the sensitive experiment.The simulations of the three-dimensional structure and evolution of the squall line are closely related with the observations when the proper microphysical processes were employed. The more latent heating released in the ice phase processes associated with the freezing process leads to strengthening deep convection due to the vertical gradient of buoyancy, which results in a long life of the convective system. In contrast, the warm rain process is characterized by short life period, more pronounced rearward tilt structure and extension of stratiform cloud.