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DOI	10.1016/j.atmosres.2020.105072
	Preliminary study on the relationship between the brightness temperature pulses observed with a ground-based microwave radiometer and the lightning current integral values
	Jiang S.; Wang Z.; Lei L.; Pan Y.; Lyu W.; Zhang Y.
发表日期	2020
ISSN	0169-8095
卷号	245
英文摘要	The integrals of lightning current and its square over time, named as the electrical charge quantity and lightning current action integral, respectively, are indicative of the total charges and heat energy released by the lightning. The temperature of air molecules along the discharging path is thus increased and can be observed by a properly-configured ground-based microwave radiometer which is originally for atmospheric temperature remote sensing. Field experiments have been performed with a ground-based, MWP967KV type microwave radiometer, which is common for atmospheric temperature profile remote sensing but has been properly-configured in order to observe the artificially triggered lightning events in May–July in 2017 and 2018 at Guangzhou Field Experiment Site for Lightning research and test (GFESL). The brightness temperature (Tb) data from the radiometer and the lightning current data measured by a coaxial shunt have been processed. The results show that a relationship like Tbmax = a + bexp.(cIt) may exist between the maximum pulse amplitude, Tbmax, in unit of K, observed in 30-50GHz band and the total current action integral, It, in unit of A2s, calculated from high temporal resolution lightning current records. The correlation coefficient is as high as 0.75 when taking the data of the two years as a whole (sample size = 16) while the coefficients a, b and c are equal to 21.53, 2.47 and 3.47, respectively. It is not evident that maximum pulse amplitude has a significant positive correlation with the total electrical charge quantity. In addition, it has been found that the variation trend of Tb pulse amplitude and lightning current integral values (i.e. current action integral and electrical charge quantity) in the lightning process are consistent. © 2020 Elsevier B.V.
关键词	Atmospheric thermodynamics Lightning Luminance Microwave devices Microwave measurement Radiometers Remote sensing Artificially triggered lightning Atmospheric temperature profiles Brightness temperatures Correlation coefficient High temporal resolution Lightning currents Microwave radiometers Positive correlations Atmospheric temperature air temperature amplitude brightness temperature experimental study lightning microwave radiometer quantitative analysis remote sensing temperature profile
语种	英语
来源机构	Atmospheric Research
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/132367
推荐引用方式 GB/T 7714	Jiang S.,Wang Z.,Lei L.,et al. Preliminary study on the relationship between the brightness temperature pulses observed with a ground-based microwave radiometer and the lightning current integral values[J]. Atmospheric Research,2020,245.
APA	Jiang S.,Wang Z.,Lei L.,Pan Y.,Lyu W.,&Zhang Y..(2020).Preliminary study on the relationship between the brightness temperature pulses observed with a ground-based microwave radiometer and the lightning current integral values.,245.
MLA	Jiang S.,et al."Preliminary study on the relationship between the brightness temperature pulses observed with a ground-based microwave radiometer and the lightning current integral values".245(2020).