Radiosonde Observations of Environments Supporting Deep Moist Convection Initiation during RELAMPAGO-CACTI
Radiosonde Observations of Environments Supporting Deep Moist Convection Initiation during RELAMPAGO-CACTI
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RELAMPAGO-CACTI 期间支持深层潮湿对流启动的环境无线电探空仪观测
DOI：
10.1175/mwr-d-20-0148.1
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发表时间：
2021
影响因子：
3.2
通讯作者：
Friedrich, Katja
中科院分区：
文献类型：
--
作者：
Nelson, T. Connor;Marquis, James;Varble, Adam;Friedrich, Katja
利用自适应地面观测遥感带电、闪电和中尺度/微尺度过程项目以及云、气溶胶和复杂地形相互作用项目部署了一个高时空分辨率无线电探空仪网络，以研究支持阿根廷中部复杂地形深对流的环境。这项研究的目的是描述最能代表近云环境（在时间和空间上）的大气剖面，以确定影响风暴发生和发展的中尺度成分。探测的时空自相关分析表明，有相当大的环境异质性，与边界层热力学和运动学领域成为统计上不相关的1-2小时和30公里的尺度。以此为指导，我们研究了各种环境参数，这些参数来自于在附近收集的测深数据（30公里的空间和30分钟的时间）的44个事件在9天内，其中大气层：1）支持了持续降水对流的开始，2）产生了弱而短暂的降水对流，或3）没有产生与允许对流模式的数值预报不一致的降水对流（即，事件）。有很大的统计差异之间的对流事件的环境和支持任何对流降水。对流事件剖面包含较大的对流可用势能，但自由对流层相对湿度较低，冻结水平较高，并有证据表明，在低层附近的地形，可能抑制深对流的发展有限的水平辐合。我们还提出了证据，从无线电探空仪和卫星测量流地形相互作用可能会产生重力波活动，影响CI的结果。
The Remote Sensing of Electrification, Lightning, and Mesoscale/Microscale Processes with Adaptive Ground Observations (RELAMPAGO) and Cloud, Aerosol, and Complex Terrain Interactions (CACTI) projects deployed a high-spatiotemporal-resolution radiosonde network to examine environments supporting deep convection in the complex terrain of central Argentina. This study aims to characterize atmospheric profiles most representative of the near-cloud environment (in time and space) to identify the mesoscale ingredients affecting storm initiation and growth. Spatiotemporal autocorrelation analysis of the soundings reveals that there is considerable environmental heterogeneity, with boundary layer thermodynamic and kinematic fields becoming statistically uncorrelated on scales of 1–2 h and 30 km. Using this as guidance, we examine a variety of environmental parameters derived from soundings collected within close proximity (30 km in space and 30 min in time) of 44 events over 9 days where the atmosphere either: 1) supported the initiation of sustained precipitating convection, 2) yielded weak and short-lived precipitating convection, or 3) produced no precipitating convection in disagreement with numerical forecasts from convection-allowing models (i.e., Null events). There are large statistical differences between the Null event environments and those supporting any convective precipitation. Null event profiles contained larger convective available potential energy, but had low free-tropospheric relative humidity, higher freezing levels, and evidence of limited horizontal convergence near the terrain at low levels that likely suppressed deep convective growth. We also present evidence from the radiosonde and satellite measurements that flow–terrain interactions may yield gravity wave activity that affects CI outcome.
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影响因子：
3.2
作者：
James N. Marquis;Yvette P. Richardson;J. Wurman
通讯作者：
James N. Marquis;Yvette P. Richardson;J. Wurman
宾夕法尼亚州东北部山波诱发降水阴影的观测
DOI：
--
发表时间：
2001
期刊：
影响因子：
--
作者：
Raymond H. Brady;Jeff S. Waldstreicher
通讯作者：
Jeff S. Waldstreicher
影响因子：
2.9
作者：
Johannes Sachsperger;S. Serafin;V. Grubišić
通讯作者：
Johannes Sachsperger;S. Serafin;V. Grubišić
影响因子：
5
作者：
J. H. Sørensen;A. Rasmussen;T. Ellermann;E. Lyck
通讯作者：
J. H. Sørensen;A. Rasmussen;T. Ellermann;E. Lyck
对流起始对活动含云层消逝率的敏感性
影响因子：
3.2
作者：
A. Houston;D. Niyogi
通讯作者：
D. Niyogi