Heat and Moisture Budgets of an Intense Midlatitude Squall Line
Heat and Moisture Budgets of an Intense Midlatitude Squall Line
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DOI：
10.1175/1520-0469(1991)048
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发表时间：
1991
影响因子：
3.1
通讯作者：
W. Gallus;Richard H. Johnson
中科院分区：
文献类型：
--
作者：
W. Gallus;Richard H. Johnson
本文利用俄克暴雨前的Rawinsonde资料，计算了一个具有拖尾层状区的强斜线系统在成熟后期到消散阶段的热量和水汽收支。预算是使用三小时间隔内约30个雷声探测仪的合成数据分三次计算出来的。数据间隔略微足以分辨宽阔(∼200公里)层状区域内的特征，但不足以分辨狭窄(∼40公里)领先对流线内的特征。利用低空雷达资料和地面累积雨量将系统划分为对流线区和层状区，并检验热量和水汽收支的准确性。狂风线有一个明显下降的后方急流，随着时间的推移向系统的前部延伸，并在急流上方和下方有强大的从前到后的流动。诊断出的垂直运动表现为前导对流线深部上升，后方层中高层上升高于下层下降。
Abstract Rawinsonde data from OK PRE-STORM are used to calculate the heat and moisture budgets during the late mature through dissipating stages of an intense squall line system with a trailing stratiform region. Budgets have been computed at three separate times using composited data from approximately 30 rawinsondes over three-hour intervals. Data spacing is marginally adequate to resolve features within the broad (∼200 km) stratiform region, but not the narrow (∼40 km) leading convective line. Low-level radar data and surface accumulated rainfall are used to partition the system into convective line and stratiform regions, and to cheek the accuracy of the heat and moisture budgets. The squall line had a pronounced descending rear inflow jet that extended toward the front of the system with time, and strong front-to-rear flow above and beneath this jet. The diagnosed vertical motion showed deep ascent in the leading convective line and upper-level ascent above lower-level descent in the trailing stratif...