Variability in Isolated Convective Activity between Louisville, Kentucky, and Nearby Rural Locations
Variability in Isolated Convective Activity between Louisville, Kentucky, and Nearby Rural Locations
复制标题
DOI：
10.1175/ei-d-20-0012.1
复制
发表时间：
2021-01
影响因子：
2
通讯作者：
J. Naylor;A. Kennedy
中科院分区：
文献类型：
--
作者：
J. Naylor;A. Kennedy
这项研究分析了肯塔基州路易斯维尔附近强、孤立对流单体的频率。恶劣天气数据清单的数据被用来比较2003年至2019年路易斯维尔上空对流活动的频率与附近农村地区的观测频率。结果表明，路易斯维尔经历的孤立对流活动明显多于农村地区。路易斯维尔和农村地区的对流活动在夏季差异最大，差异最大的时间出现在5月和8月之间。相对于农村地区，路易斯维尔在下午和傍晚早些时候经历了更多的孤立对流活动，但午夜以后和清晨的活动较少。路易斯维尔上空的孤立对流事件最有可能发生在静止的天气条件下，而乡村事件更有可能发生在活跃的天气模式中。为了确定这些差异是否可以主要归因于城市效应，另外两个城市--田纳西州的纳什维尔和俄亥俄州的辛辛那提--进行了比较。纳什维尔和辛辛那提都经历了比附近所有五个农村比较地区更孤立的对流活动，但两个地区的结果在五个农村地区中的四个具有统计意义。此外，辛辛那提的分析还包括与俄亥俄州哥伦布市城市化地区重叠的第六个比较地点。对于该地点，对流活动的差异在统计上并不显著。
This study analyzes the frequency of strong, isolated convective cells in the vicinity of Louisville, Kentucky. Data from the Severe Weather Data Inventory are used to compare the frequency of convective activity over Louisville with the observed frequency at nearby rural locations from 2003 to 2019. The results show that Louisville experiences significantly more isolated convective activity than do the rural locations. The difference in convective activity between Louisville and the rural locations is strongest during summer, with peak differences occurring between May and August. Relative to the rural locations, Louisville experiences more isolated convective activity in the afternoon and early evening but less activity after midnight and into the early morning. Isolated convective events over Louisville are most likely during quiescent synoptic conditions, whereas rural events are more likely during active synoptic patterns. To determine whether these differences can be attributed primarily to urban effects, two additional cities are shown for comparison—Nashville, Tennessee, and Cincinnati, Ohio. Both Nashville and Cincinnati experience more isolated convective activity than all five of their nearby rural comparison areas, but the results for both are statistically significant at four of the five rural locations. In addition, the analysis of Cincinnati includes a sixth comparison site that overlaps the urbanized area of Columbus, Ohio. For that location, differences in convective activity are not statistically significant.