大气科学2016，Vol.40Issue(4)：689-702,14.DOI:10.3878/j.issn.1006-9895.1505.14337
飑线组织化过程对环境垂直风切变和水汽的响应
Impact of Vertical Wind Shear and Moisture on the Organization of Squall Lines
摘要
Abstract
AbstractThe redistribution of physical factors and its impacts on the intensity of squall lines under the influence of <br> low-level Vertical Wind Shear (VWS) and moisture content are examined through two-dimensional idealized simulations with the ARPS model (the University of Oklahoma’s Advanced Research Prediction System). It shows that the redistribution of momentum, heat and moisture during the evolution of squall lines leads to the change of inner vertical circulation and the configuration of perturbation temperature and humidity, which affects the organization of deep convection and the intensity of the system. The results of sensitivity tests of low-level VWS and moisture content show that increasing (decreasing) the low-level VWS decelerates (accelerates) the propagation of the squall line, and makes the connection (separation) between the mid-level upward current and the new forced updrafts at the front edge of the cold pool, which corresponds to the intensification (weakening) of the squall line. On the other hand, increasing (decreasing) the low-level moisture content results in an increase (decrease) of moisture delivery from the low to middle level, which enhances (weakens) the mid-level latent heating and upward movement. Energy analysis indicates that the low-level moisture change influences the release of Convective Available Potential Energy (CAPE), and the intensity of the new convection. The combined effects of latent heating and CAPE released from low-level moisture change also affect the squall line intensity through exerting an influence on the organization of the upper-level upward currents and the new forced updrafts at the front edge of the cold pool.关键词
飑线/数值模拟/冷池/环境垂直风切变/水汽1Key words
Squall line/Numerical simulation/Cold pool/Vertical Wind Shear/Moisture分类
大气科学引用本文复制引用
张建军,王咏青,钟玮..飑线组织化过程对环境垂直风切变和水汽的响应[J].大气科学,2016,40(4):689-702,14.基金项目
国家重点基础研究发展计划（973计划）项目2013CB430103，国家自然科学基金项目41275002、41230421，江苏省高校自然科学研究重大项目14KJA170005，江苏省“333高层次人才培养工程”项目，灾害天气国家重点实验室开放课题（2014LASW-B08）Funded by National Key Basic Research and Development Project of China (973 Program)(Grant 2013CB430103), National Natural Science Foundation of China (Grants 41275002 and 41230421), The Natural Science Foundation of the Jiangsu Higher Education Institutions of China (Grant 14KJA170005),“333 High-Level Talent Development Program” in Jiangsu Province, National Key Laboratory of Disaster Weather (Grant 2014LASW-B08) （973 Program）
