Universidade Federal de Campina Grande, Unidade Acadêmica de Ciências Atmosféricas, Rua Aprígio Veloso, 882, 58429-900 Campina Grande, PB, Brazil.
An Acad Bras Cienc. 2022 Aug 1;94(3):e20201739. doi: 10.1590/0001-3765202220201739. eCollection 2022.
The relationships among humidity, air temperature, wind, and vertical velocity with formation and propagation of Amazonian squall lines (ASL) is analyzed in this study. One year of data (2005) is verified by counting ASL cases according to their classification (propagated and non-propagated) to understand more clearly how the variation of these variables over this year influences their environment of formation. The results show an increase in humidity on days with ASL, with the highest occurrence during the wettest months. Furthermore, system propagation toward the interior of continent seems to be strongly related to the moisture content that reaches the coast, through the winds that blow from the ocean from both by the Northeast Trade Winds, of the North Atlantic Subtropical High, and by the Southeast Trade Winds, of the South Atlantic Subtropical High. Higher moisture content from the sea corresponds to a higher wind intensity toward the coast. A relationship between continent/ocean temperature gradient and the ASL amount and types formed is also demonstrated. Such information is extremely relevant because of the great importance of these systems in the extreme north and northeast regions of Brazil, particularly at the Amazon, given the difficulty of predicting them due to their complexity.
本研究分析了湿度、空气温度、风和垂直速度与亚马逊飑线（ASL）形成和传播的关系。根据其分类（传播和不传播）对 2005 年一年的数据进行验证，以更清楚地了解这些变量在这一年中的变化如何影响它们的形成环境。结果表明，在有 ASL 的日子里湿度增加，在最潮湿的月份湿度最高。此外，系统向大陆内部的传播似乎与到达海岸的水汽密切相关，这些水汽通过从海洋吹来的风从北大西洋副热带高压的东北信风和南大西洋副热带高压的东南信风带来。来自海洋的更高湿度对应于海岸附近更高的风速。大陆/海洋温度梯度与形成的 ASL 数量和类型之间也存在关系。由于这些系统在巴西的北部和东北部地区，特别是在亚马逊地区具有非常重要的意义，因此这些信息极其重要，因为由于其复杂性，预测这些系统非常困难。
