Relationships among diurnal variations of polar night cloud, precipitation, surface temperatures, and the fair-weather return current of the global electric circuit (GEC)
Relationships among diurnal variations of polar night cloud, precipitation, surface temperatures, and the fair-weather return current of the global electric circuit (GEC)
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极夜云日变化、降水、地表温度和全球电路（GEC）晴天回流之间的关系
DOI：
10.1016/j.jastp.2023.106026
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发表时间：
2023
影响因子：
1.9
通讯作者：
Liu, Chuntao
中科院分区：
文献类型：
--
作者：
Lavigne, Thomas;Liu, Chuntao
在过去五年(2017年6月-目前)，在能源部-大气辐射测量部(DOE ARM)阿拉斯加北坡(NSA)野外站点监测了垂直电场(EZ)以及大量云、降水和辐射特性。将极夜晴天综合平均Ez与合成Ceileter云底高度进行比较，发现两者之间存在显著的相关关系(r=0.62)，支持了前人关于局地电场与云特性之间高度相关的研究。通过在现场使用广泛的仪器，如微脉冲激光雷达(MPL)、Ka波段天顶雷达(KAZR)、Ceileter、SKYRAD、降水成像包(PIP)等，这项研究提供了更全面的云和降水特性的日循环以及更大的全球电路(GEC)系统的局部化晴天回流。在极地夜间，合成的晴天平均Ez与云层厚度、最大柱状后向散射和降水粒子计数之间的比较都显示出相似的日变化，表明在最大震级晴朗天气Ez时段，云基往往较高，云层较厚，柱状后向散射较大，降水粒子较多。此外，极地夜间地表温度的微小日变化与SKYRAD测量的长波下流辐照度高度相关(r=0.87)，表明局地云层物理性质的变化可以调制约0.5℃/天的极地夜间地表温度日变化。这些研究结果强调了GEC系统的重要性和全球性质，全球范围内的雷暴和带电云团可能会影响极地夜间云的特性以及冬季极地表面温度的昼夜变化。
Over the past five years (June 2017-current), the vertical electric field (Ez) as well as numerous cloud, precipitation and radiation properties have been monitored at the Department of Energy-Atmospheric Radiation Measurement (DOE ARM) North Slope of Alaska (NSA) field site. Comparisons between the composite diurnal averaged fair-weather Ez, and composite ceilometer derived cloud base height during the polar night, reveal a significant correlation between the parameters (r = 0.62), supporting previous studies that there is high correlation between local electric field and cloud properties. With the use of extensive instrumentation at the site, such as the Micro Pulse Lidar (MPL), Ka-band Zenith Radar (KAZR), ceilometer, SKYRAD, Precipitation Imaging Package (PIP), among others, this study provides a more comprehensive examination of the diurnal cycle of cloud and precipitation properties along with the localized fair-weather return current of the larger Global Electric Circuit (GEC) system. Comparisons between the composite diurnal averaged fair-weather Ez, and cloud thickness, maximum column backscatter, and precipitation particle counts all show similar diurnal variability during the polar night, indicating that during the largest magnitude fair weather Eztime periods, clouds bases tend to be higher, clouds are thicker, have a larger column backscatter, and display more precipitating particles. Furthermore, a slight diurnal variability in the polar night surface temperature was found to be highly correlated (r = 0.87) to the longwave downwelling irradiance measured by SKYRAD, indicating that the variations in the physical properties of local clouds could modulate the diurnal polar night surface temperature variability on the order of 0.5 °C/day. These findings emphasize the importance and global nature of the GEC system, with the global aggregate of thunderstorms and electrified clouds potentially influencing polar night cloud properties as well as diurnal wintertime polar surface temperature variation.
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影响因子：
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作者：
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发表时间：
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