Environment Associated with Deep Moist Convection under SALLJ Conditions: A Case Study
Environment Associated with Deep Moist Convection under SALLJ Conditions: A Case Study
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SALLJ 条件下与深层潮湿对流相关的环境：案例研究
DOI：
10.1175/2010waf2222352.1
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发表时间：
2010
影响因子：
2.9
通讯作者：
Yanina García Skabar
中科院分区：
文献类型：
--
作者：
Paloma Borque;P. Salio;M. Nicolini;Yanina García Skabar
摘要 目前的工作重点是研究 2003 年 2 月 6 日至 7 日南美低空急流实验期间阿根廷中部和北部上空一组副热带中尺度对流系统发展之前的环境条件。这一时期的特点是沿着安第斯山脉东部山麓的极北低空气流[南美低空急流(SALLJ)]。整个研究事件主要是阿根廷北部上空存在非常不稳定的气团和南纬 40° 附近的锋区。由于强烈的湿度和温差平流，SALLJ 对大气造成了严重的不稳定。地形为区域风场的配置提供了额外的抬升运动，这有效地迫使对流的启动。对流一旦发展起来，就会在对流不稳定性水平均匀且较强的区域移动和再生。
Abstract The present work focuses on the study of the environmental conditions preceding the development of a group of subtropical mesoscale convective systems over central and northern Argentina on 6–7 February 2003 during the South American Low Level Jet Experiment. This period was characterized by an extreme northerly low-level flow along the eastern Andes foothills [South American low-level jet (SALLJ)]. The entire studied episode was dominated by the presence of a very unstable air mass over northern Argentina and a frontal zone near 40°S. The SALLJ generated an important destabilization of the atmosphere due to the strong humidity and differential temperature advection. Orography provided an extra lifting motion to the configuration of the regional wind field, which was efficient in forcing the initiation of convection. Once convection developed, it moved and regenerated in regions where the convective instability was horizontally homogeneous and stronger.