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Observations from the one year electric field Study-North Slope of Alaska (OYES-NSA) field campaign, and their implications for observing the distribution of global electrified cloud activity
Journal of Atmospheric and Solar-Terrestrial Physics ( IF 1.8 ) Pub Date : 2021-01-06 , DOI: 10.1016/j.jastp.2020.105528
Thomas Lavigne , Chuntao Liu , Joseph Hill , Eric Bruning

For over a century, the electric Potential Gradient (PG) of the atmosphere has been measured and studied. The local vertical electric field (Ez) is strongly influenced by the presence of lightning, electrified clouds, rainfall, aerosols, and many others. The One Year Electric Field Study-North Slope of Alaska (OYES-NSA) field campaign was established in the summer of 2017 to measure the vertical electric field at the ARM site in Barrow, Alaska alongside a wide array of supplementary instrumentation, including a Micro-Pulse Lidar and upward facing Ka-band radar. Two years of observations (072017-062019) have shown the possibility to quantify the local effects from aerosols and clouds observed by the Lidar and Radar on the measured EZ. Throughout the manuscript, the physics convention of negative downward fair-weather electric fields is used. Three cases (convective clouds, high concentration of near surface aerosols, and blowing snow) are used to demonstrate the localized effects on the measured EZ. Utilizing the relationships between EZ and backscatter/reflectivity, we have developed a methodology to distinguish samples with local influences. A fair-weather (FW) condition is determined to be associated with a low Lidar backscattering (less than 15 km−1sr−1), in the presence of no significant cloud activity (radar reflectivity less than −10dBZ). The samples satisfying these criteria are found with a 5-min averaged standard deviation of less than 15 V/m, and EZ between −250 V/m to −50 V/m. Using only properties of the EZ measurements allows for the simultaneous comparisons of FW at multiple sites, without the need for supplementary information of local weather conditions. Simultaneous EZ measurements from 8 FW cases are shown between Barrow, AK and Corpus Christi, TX on the timescale of minutes to hours. Similar variation patterns in the FW EZ are shown at both sites, providing evidence of the global nature of the atmospheric electric system. Furthermore, the seasonal-diurnal variability of FW at multiple sites shows similar distributions of the PG.



中文翻译:

一年电场研究阿拉斯加北坡(OYES-NSA)野战的观测结果及其对观测全球电气化云活动分布的影响

一个多世纪以来,已经对大气的电势梯度(PG)进行了测量和研究。局部垂直电场(E z)受雷电,带电云,降雨,气溶胶和许多其他因素的强烈影响。阿拉斯加北坡一年电场研究(OYES-NSA)野战活动于2017年夏季成立,旨在测量阿拉斯加巴罗ARM基地的垂直电场以及各种辅助仪器,包括微型-脉冲激光雷达和朝上的Ka波段雷达。两年的观察(072017-062019)显示了量化激光雷达和雷达观测到的气溶胶和云对测得的E Z的局部影响的可能性。在整个手稿中,均使用负向下的晴天电场的物理惯例。使用三种情况(对流云,高浓度的近地表气溶胶和吹雪)来证明对测得的E Z的局部影响。利用E Z与反向散射/反射率之间的关系,我们开发了一种方法来区分具有局部影响的样品。在没有明显的云活动(雷达反射率小于-10dBZ)的情况下,确定的公平天气(FW)条件与低激光雷达后向散射(小于15 km -1 sr -1)相关。发现满足这些标准的样品的5分钟平均标准偏差小于15 V / m,EZ在-250 V / m至-50 V / m之间。仅使用E Z测量的属性可以同时比较多个站点的FW,而无需获取本地天气状况的补充信息。在几分钟到几小时的时间范围内,显示了来自8个FW案例的同时E Z测量值,位于Barrow,AK和TX,Corpus Christi之间。在两个站点上都显示了FW E Z中类似的变化模式,这提供了大气电子系统的整体性质的证据。此外,FW在多个地点的季节性昼夜变化显示出PG的相似分布。

更新日期:2021-01-16
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