根据2021—2023年粤港澳闪电定位系统(Guangdong-Hong Kong-Macao Lightning Location System, GHMLLS)和由广东省ADTD(Advanced TOA and Direction)闪电定位系统升级后的DDW1全闪三维闪电定位系统的观测资料,对广东省范围内两套数据进...根据2021—2023年粤港澳闪电定位系统(Guangdong-Hong Kong-Macao Lightning Location System, GHMLLS)和由广东省ADTD(Advanced TOA and Direction)闪电定位系统升级后的DDW1全闪三维闪电定位系统的观测资料,对广东省范围内两套数据进行时空匹配融合,并基于自然闪电观测数据对定位系统的效能进行对比评估。结果表明:两系统观测到地闪总数的月变化和日变化特征一致性强,DDW1观测的地闪数量偏少,仅为GHMLLS的0.5倍;DDW1平均雷电流为GHMLLS的1.72倍。通过空间分布和真实闪电事件校验发现GHMLLS对珠三角范围内闪电探测能力较强,且多年来较为稳定;而DDW1在2022年8月完成升级后,站点分布较为均匀,能够在一定程度上配合GHMLLS完成对于广东全境闪电的全面探测;两套闪电定位系统形成优势互补。展开更多
Based on the VHF lightning locating system,a three-dimensional-space cell-gridded approach is used to extract the lighting channel and calculate the length of the channel.Through clustering of the located radiation so...Based on the VHF lightning locating system,a three-dimensional-space cell-gridded approach is used to extract the lighting channel and calculate the length of the channel.Through clustering of the located radiation sources and then extracting the lightning channel,it can accurately obtain the length of the channel.To validate the feasibility of the approach,a simulation experiment is designed,and it shows the length error is no more than 10%.The relationship between the NO production of per unit arc length and atmospheric pressure obtained in laboratory is applied to the NOX production of per unit flash length at different altitudes in this paper.The channel length and the NOX production of 11 negative cloud-to-ground flashes and 59 intracloud flashes in an isolated thunderstorm in the northeastern Qinghai-Tibet Plateau are calculated.The results show that the average channel lengths of per cloud-to-ground and intracloud flash are 28.9 and 22.3 km respectively;the average NOX productions of per cloud-to-ground and intracloud flash are 1.89×1025 and 0.42×1025 molecules,respectively.展开更多
文摘根据2021—2023年粤港澳闪电定位系统(Guangdong-Hong Kong-Macao Lightning Location System, GHMLLS)和由广东省ADTD(Advanced TOA and Direction)闪电定位系统升级后的DDW1全闪三维闪电定位系统的观测资料,对广东省范围内两套数据进行时空匹配融合,并基于自然闪电观测数据对定位系统的效能进行对比评估。结果表明:两系统观测到地闪总数的月变化和日变化特征一致性强,DDW1观测的地闪数量偏少,仅为GHMLLS的0.5倍;DDW1平均雷电流为GHMLLS的1.72倍。通过空间分布和真实闪电事件校验发现GHMLLS对珠三角范围内闪电探测能力较强,且多年来较为稳定;而DDW1在2022年8月完成升级后,站点分布较为均匀,能够在一定程度上配合GHMLLS完成对于广东全境闪电的全面探测;两套闪电定位系统形成优势互补。
基金supported by the National Natural Science Foundation of Chi-na(Grant Nos.41075002,40775004,41030960)R&D Special Fund for Public Welfare Industry(Meteorology)(Grant No.GYHY201006005-03)
文摘Based on the VHF lightning locating system,a three-dimensional-space cell-gridded approach is used to extract the lighting channel and calculate the length of the channel.Through clustering of the located radiation sources and then extracting the lightning channel,it can accurately obtain the length of the channel.To validate the feasibility of the approach,a simulation experiment is designed,and it shows the length error is no more than 10%.The relationship between the NO production of per unit arc length and atmospheric pressure obtained in laboratory is applied to the NOX production of per unit flash length at different altitudes in this paper.The channel length and the NOX production of 11 negative cloud-to-ground flashes and 59 intracloud flashes in an isolated thunderstorm in the northeastern Qinghai-Tibet Plateau are calculated.The results show that the average channel lengths of per cloud-to-ground and intracloud flash are 28.9 and 22.3 km respectively;the average NOX productions of per cloud-to-ground and intracloud flash are 1.89×1025 and 0.42×1025 molecules,respectively.
