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我国大气电学研究的最新进展 被引量:2
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作者 郄秀书 朱江皖 +12 位作者 底绍轩 骆烁名 黄子凡 刘冬霞 张鸿波 袁善锋 刘明远 孙竹玲 徐晨 孙春发 王东方 蒋如斌 杨静 《大气科学》 CSCD 北大核心 2024年第1期51-75,共25页
大气电学主要研究地球大气和近地空间发生的电学过程及其机理和影响,其核心研究内容是雷电物理和雷暴电学。自1980年代以来,中国大气电学研究不断取得新的进展,特别是近年来,得益于高时间分辨率雷电探测技术的进步,大气电学研究不仅在... 大气电学主要研究地球大气和近地空间发生的电学过程及其机理和影响,其核心研究内容是雷电物理和雷暴电学。自1980年代以来,中国大气电学研究不断取得新的进展,特别是近年来,得益于高时间分辨率雷电探测技术的进步,大气电学研究不仅在雷电物理学和雷暴云电荷结构方面取得了重要成果,也在雷电和雷暴对近地空间的影响、强对流天气的雷电特征、以及雷电资料同化和预警预报等方面取得了重要进展。本文从六个方面对近五年来大气电学的主要研究进展进行回顾,包括高精度雷电探测和定位技术、雷电物理过程和机制、雷暴对中上层大气的影响、雷暴云电荷结构的观测和数值模拟、强对流天气的雷电特征与预报、雷电对气候变化的影响与响应等,最后对大气电学未来发展进行展望。 展开更多
关键词 大气电学 雷暴 雷电 强对流天气 资料同化和预警预报
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论观测数据及其准确性之重要性
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作者 白建辉 万晓伟 +3 位作者 柴文海 吴翼美 李凯丽 宋涛 《地球科学前沿(汉斯)》 2024年第6期722-732,共11页
本文较全面地分析了地球上位于三极、低纬度、中纬度地区5个典型区域站点太阳总辐射测量数据及其经验模型计算结果(包括各种误差)。研究发现,太阳辐射测量和计算结果的数据质量在5个站点存在差别,其中以南极地区Dome C站测量和计算结果... 本文较全面地分析了地球上位于三极、低纬度、中纬度地区5个典型区域站点太阳总辐射测量数据及其经验模型计算结果(包括各种误差)。研究发现,太阳辐射测量和计算结果的数据质量在5个站点存在差别,其中以南极地区Dome C站测量和计算结果的数据质量最好。进而讨论了产生这些差异的主要因素,提出了关于太阳辐射日常测量、仪器维护以及经验模型建立等方面的一些建议,以便获得可靠、准确、高质量的太阳辐射数据及其计算模型。进一步,本文开展了扩展研究,简要分析了生物挥发性有机物(BVOCs)排放、碳平衡(包括初级生产力GPP、呼吸Re、净生态系统生产力NEP)的测量数据和经验模型的计算结果,获得类似结论,即测量数据的质量是科学研究中的重要基础,高质量的测量数据在模型建立、检验、评价等方面发挥着重要作用。 展开更多
关键词 太阳辐射 辐射表 测量误差 经验模型 生物挥发性有机物
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高建筑物雷电光谱校正对通道温度反演的影响
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作者 王雪娟 化乐彦 +7 位作者 王炳浩 许伟群 吕伟涛 陈绿文 武斌 齐奇 马颖 杨静 《应用气象学报》 CSCD 北大核心 2024年第4期493-501,共9页
雷电光谱强度因受到大气衰减特性、光栅响应特性以及相机光电响应特性等影响,导致光谱定量分析中通道温度的反演存在误差。以1次高建筑物雷电回击光谱为例,考虑相机和光栅的仪器响应对其进行校正,对比校正前后的光谱结构和谱线强度,并... 雷电光谱强度因受到大气衰减特性、光栅响应特性以及相机光电响应特性等影响,导致光谱定量分析中通道温度的反演存在误差。以1次高建筑物雷电回击光谱为例,考虑相机和光栅的仪器响应对其进行校正,对比校正前后的光谱结构和谱线强度,并基于多谱线法利用1次电离的氮离子(NII)和中性氧原子(OI)谱线反演通道温度,分析光谱校正对通道温度反演的影响。结果显示:光谱校正后离子和中性原子谱线强度均明显增强,尤其可见光区域的连续谱强度明显增强,导致其谱线结构变化显著,而近红外区域的谱线结构变化不显著。利用校正后可见光区域的NII谱线和近红外区域的OI谱线反演通道温度时,线性拟合的决定系数均增大,反演准确度均得到提升。NII和OI谱线反演的通道温度平均值相比校正前分别降低4660 K和上升1540 K,且由OI谱线反演的通道温度低于由NII谱线反演的温度,说明它们分别对应雷电放电通道径向的不同区域。 展开更多
关键词 高建筑物雷电 光谱校正 多谱线法 温度
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正极性人工触发闪电的向上负先驱脉冲放电过程研究
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作者 吕冠霖 蒋如斌 +6 位作者 李宗祥 袁善锋 张鸿波 李晓 刘昆 陈睿凌 刘明远 《大气科学》 CSCD 北大核心 2024年第2期497-506,共10页
利用人工触发正极性闪电的综合同步探测资料,对引雷火箭上升过程中发生于金属导线顶端的向上负先驱脉冲放电过程进行了研究。除常规认识的峰值电流为十几到几十安培的先驱脉冲放电以外,高垂直分辨率电流探测系统记录到丰富的弱脉冲放电... 利用人工触发正极性闪电的综合同步探测资料,对引雷火箭上升过程中发生于金属导线顶端的向上负先驱脉冲放电过程进行了研究。除常规认识的峰值电流为十几到几十安培的先驱脉冲放电以外,高垂直分辨率电流探测系统记录到丰富的弱脉冲放电过程。所有孤立发生的脉冲放电,均为弱脉冲,且在所有常规强度的先驱脉冲(簇)放电之前约20μs,均识别到这种弱脉冲。对测量到的弱脉冲、脉冲型脉冲和波纹型脉冲进行统计,得到了各自的峰值电流(3.6 A、32.2 A、11.1 A)、上升时间(0.39μs、0.9μs、3.2μs)、持续时间(2.8μs、5.1μs、12.7μs)和转移电荷量(4.7μC、50.8μC、83.2μC)。常规强度的先驱脉冲形成了可探测的发光通道,簇状先驱脉冲的放电通道具有与自持先导初始阶段相一致的梯级发展传输特征,二维平均速度在105 m s^(−1)量级。分析相邻先驱脉冲发光通道的时空关系,发现后一次先驱脉冲放电通道的起始高度一般位于前一次先驱脉冲放电通道的顶端,通道梯级延伸时电荷分布的调整降低了通道区域的电场强度。先驱脉冲放电是金属导线顶端形成了先导但又由于条件不足而熄灭的过程。 展开更多
关键词 人工触发闪电 负极性先驱脉冲 击穿 先导
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Microphysical Characteristics of Rainfall Based on Long-Term Observations with a 2DVD in Yangbajain,Tibet
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作者 Ming LI Yongheng BI +4 位作者 Yonghai SHEN Yinan WANG Ciren Nima Tianlu CHEN Daren LYU 《Advances in Atmospheric Sciences》 SCIE CAS CSCD 2024年第9期1721-1734,共14页
Raindrop size distribution(DSD)plays a crucial role in enhancing the accuracy of radar quantitative precipitation estimates in the Tibetan Plateau(TP).However,there is a notable scarcity of long-term,high-resolution o... Raindrop size distribution(DSD)plays a crucial role in enhancing the accuracy of radar quantitative precipitation estimates in the Tibetan Plateau(TP).However,there is a notable scarcity of long-term,high-resolution observations in this region.To address this issue,long-term observations from a two-dimensional video disdrometer(2DVD)were leveraged to refine the radar and satellite-based algorithms for quantifying precipitation in the hinterland of the TP.It was observed that weak precipitation(R<1,mm h-1)accounts for 86%of the total precipitation time,while small raindrops(D<2 mm)comprise 99%of the total raindrop count.Furthermore,the average spectral width of the DSD increases with increasing rain rate.The DSD characteristics of convective and stratiform precipitation were discussed across five different rain rates,revealing that convective precipitation in Yangbajain(YBJ)exhibits characteristics similar to maritime-like precipitation.The constrained relationships between the slopeΛand shapeμ,D_(m)and N_(w)of gamma DSDs were derived.Additionally,we established a correlation between the equivalent diameter and drop axis ratio and found that raindrops on the TP attain a nearly spherical shape.Consequently,the application of the rainfall retrieval algorithms of the dual-frequency precipitation radar in the TP is improved based on the statistical results of the DSD. 展开更多
关键词 Tibetan Plateau raindrop size distribution 2DVD dual frequency radar microphysical features
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A Tutorial Review of the Solar Power Curve: Regressions, Model Chains, and Their Hybridization and Probabilistic Extensions
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作者 Dazhi YANG Xiang’ao XIA Martin János MAYER 《Advances in Atmospheric Sciences》 SCIE CAS CSCD 2024年第6期1023-1067,共45页
Owing to the persisting hype in pushing toward global carbon neutrality,the study scope of atmospheric science is rapidly expanding.Among numerous trending topics,energy meteorology has been attracting the most attent... Owing to the persisting hype in pushing toward global carbon neutrality,the study scope of atmospheric science is rapidly expanding.Among numerous trending topics,energy meteorology has been attracting the most attention hitherto.One essential skill of solar energy meteorologists is solar power curve modeling,which seeks to map irradiance and auxiliary weather variables to solar power,by statistical and/or physical means.In this regard,this tutorial review aims to deliver a complete overview of those fundamental scientific and engineering principles pertaining to the solar power curve.Solar power curves can be modeled in two primary ways,one of regression and the other of model chain.Both classes of modeling approaches,alongside their hybridization and probabilistic extensions,which allow accuracy improvement and uncertainty quantification,are scrutinized and contrasted thoroughly in this review. 展开更多
关键词 review energy meteorology solar power curve model chain solar power prediction
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A rapid assessment of MWRI-RM/FY3G brightness temperature
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作者 Wenying He Xinran Xia +5 位作者 Shengli Wu Peng Zhang Hongbin Chen Xiang'ao Xia Yuquan Zhou Miao Cai 《Atmospheric and Oceanic Science Letters》 CSCD 2024年第3期42-46,共5页
2023年4月发射的FY-3G上搭载17个频率的测雨微波成像仪(MWRI-RM),其业务定标的微波亮温(Tb)数据于2023年10月23日公开发布.本文比对了发布10天的MWRI-RM与全球降水测量(GPM)卫星上的微波成像仪(GMI)相匹配的Tb数据,并借助辐射传输模式... 2023年4月发射的FY-3G上搭载17个频率的测雨微波成像仪(MWRI-RM),其业务定标的微波亮温(Tb)数据于2023年10月23日公开发布.本文比对了发布10天的MWRI-RM与全球降水测量(GPM)卫星上的微波成像仪(GMI)相匹配的Tb数据,并借助辐射传输模式进行双差分(DD)交叉定标分析,旨在快速评估新一代MWRI-RM观测数据质量.观测比较表明,MWR1-RM与GMI测量的Tb一致性很好,大多通道的平均偏差(MBE)和均方根误差(RMSE)均小于1K.两种传感器由于观测角度略有不同在水面产生约0.5 K差异.DD分析也展示出MWRI-RM的大多数通道性能与GMI相当接近,尤其是首次启用的高频166 GHz和183 GHz. 展开更多
关键词 FY3G MWRI-RM GMI 亮度温度 双差分方法
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Toward Establishing a Low-cost UAV Coordinated Carbon Observation Network(LUCCN):First Integrated Campaign in China
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作者 Dongxu YANG Tonghui ZHAO +11 位作者 Lu YAO Dong GUO Meng FAN Xiaoyu REN Mingge LI Kai WU Jing WANG Zhaonan CAI Sisi WANG Jiaxu GUO Liangfu CHEN Yi LIU 《Advances in Atmospheric Sciences》 SCIE CAS CSCD 2024年第1期1-7,共7页
In this study,we introduce our newly developed measurement-fed-perception self-adaption Low-cost UAV Coordinated Carbon Observation Network(LUCCN)prototype.The LUCCN primarily consists of two categories of instruments... In this study,we introduce our newly developed measurement-fed-perception self-adaption Low-cost UAV Coordinated Carbon Observation Network(LUCCN)prototype.The LUCCN primarily consists of two categories of instruments,including ground-based and UAV-based in-situ measurement.We use the GMP343,a low-cost non-dispersive infrared sensor,in both ground-based and UAV-based instruments.The first integrated measurement campaign took place in Shenzhen,China,4 May 2023.During the campaign,we found that LUCCN’s UAV component presented significant data-collecting advantages over its ground-based counterpart owing to the relatively high altitudes of the point emission sources,which was especially obvious at a gas power plant in Shenzhen.The emission flux was calculated by a crosssectional flux(CSF)method,the results of which differed from the Open-Data Inventory for Anthropogenic Carbon dioxide(ODIAC).The CSF result was slightly larger than others because of the low sampling rate of the whole emission cross section.The LUCCN system will be applied in future carbon monitoring campaigns to increase the spatiotemporal coverage of carbon emission information,especially in scenarios involving the detection of smaller-scale,rapidly varying sources and sinks. 展开更多
关键词 CO_(2) measurement networks power station carbon emission cross-sectional flux method
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Anti-Jamming Null Space Projection Beamforming Based on Symbiotic Radio
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作者 Baofeng Ji Yifan Liu +6 位作者 Tingpeng Li Ling Xing Weixing Wang Shahid Mumtaz Xiaolong Shang Wanying Liu Congzheng Han 《Computer Modeling in Engineering & Sciences》 SCIE EI 2024年第1期679-689,共11页
With the development of information technology,more and more devices are connected to the Internet through wireless communication to complete data interconnection.Due to the broadcast characteristics ofwireless channe... With the development of information technology,more and more devices are connected to the Internet through wireless communication to complete data interconnection.Due to the broadcast characteristics ofwireless channels,wireless networks have suffered more and more malicious attacks.Physical layer security has received extensive attention from industry and academia.MIMO is considered to be one of the most important technologies related to physical layer security.Through beamforming technology,messages can be transmitted to legitimate users in an offset direction that is as orthogonal as possible to the interference channel to ensure the reception SINR by legitimate users.Combining the symbiotic radio(SR)technology,this paper considers a symbiotic radio antijamming MIMO system equipped with a multi-antenna system at the main base station.In order to avoid the interference signal and improve the SINR of the signal received by the user.The base station is equipped with a uniform rectangular antenna array,and using Null Space Projection(NSP)Beamforming,Intelligent Reflecting Surface(IRS)can assist in changing the beam’s angle.The simulation results show that NSP Beamforming could make a better use of the null space of interference,which can effectively improve the received SINR of users under directional interference,and improve the utilization efficiency of signal energy. 展开更多
关键词 Symbiotic radio ANTI-JAMMING MIMO NSP Beamforming physical layer security
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Quantification of CO_(2) Emissions from Three Power Plants in China Using OCO-3 Satellite Measurements
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作者 Yang YANG Minqiang ZHOU +3 位作者 Wei WANG Zijun NING Feng ZHANG Pucai WANG 《Advances in Atmospheric Sciences》 SCIE CAS CSCD 2024年第11期2276-2288,共13页
Coal-fired power plants are a major carbon source in China. In order to assess the evaluation of China's carbon reduction progress with the promise made on the Paris Agreement, it is crucial to monitor the carbon ... Coal-fired power plants are a major carbon source in China. In order to assess the evaluation of China's carbon reduction progress with the promise made on the Paris Agreement, it is crucial to monitor the carbon flux intensity from coal-fired power plants. Previous studies have calculated CO_(2) emissions from point sources based on Orbiting Carbon Observatory-2 and-3(OCO-2 and OCO-3) satellite measurements, but the factors affecting CO_(2) flux estimations are uncertain. In this study, we employ a Gaussian Plume Model to estimate CO_(2) emissions from three power plants in China based on OCO-3 XCO_(2) measurements. Moreover, flux uncertainties resulting from wind information, background values,satellite CO_(2) measurements, and atmospheric stability are discussed. This study highlights the CO_(2) flux uncertainty derived from the satellite measurements. Finally, satellite-based CO_(2) emission estimates are compared to bottom-up inventories.The satellite-based CO_(2) emission estimates at the Tuoketuo and Nongliushi power plants are ~30 and ~10 kt d^(-1) smaller than the Open-Data Inventory for Anthropogenic Carbon dioxide(ODIAC) respectively, but ~10 kt d^(-1) larger than the ODIAC at Baotou. 展开更多
关键词 OCO-3 power plant CO_(2)emission Gaussian Plume Model
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LASER RANGING OF LAGEOS AND ITS ACCURACY ESTIMATION AT SHANGHAI OBSERVATORY DURING MAIN MERIT CAMPAIGN 被引量:2
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作者 杨福民 谭德同 +7 位作者 肖炽焜 李振宇 陆文虎 陈婉珍 蔡世福 陈富祥 张忠平 胡振琪 《Chinese Science Bulletin》 SCIE EI CAS 1987年第7期468-473,共6页
During the Main MERIT Campaign (September 1, 1983—October 31, 1984), the Laser Geodynamic Satellite(LAGEOS) has been successfully observed at the Shanghai Observatory, Academia Sinica, with the second-generation Sate... During the Main MERIT Campaign (September 1, 1983—October 31, 1984), the Laser Geodynamic Satellite(LAGEOS) has been successfully observed at the Shanghai Observatory, Academia Sinica, with the second-generation Satellite Laser Ranging(SLR) system. The first echo from LAGEOS was received on November 7, 1983. In those days, the visually tracking mode was used. Through the main spectroscope optics system, the observer visually detected and tracked satellites with the joystick. The status and 展开更多
关键词 tracked observer optics LASER fitting PROCESSED instead POLYNOMIAL ystem SERVO
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植物源挥发性有机物采样和分析方法研究进展
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作者 张宜升 谭玉冉 +6 位作者 韩枝燏 白建辉 顾达萨 马子轸 陶文鑫 杜金花 冷吉虎 《环境科学与技术》 CAS CSCD 北大核心 2023年第4期81-91,共11页
植物源挥发性有机物(BVOCs)排放量约占全球总VOCs排放的90%,其排放易受环境因子(温度、光照、土壤水分、饱和水汽压差、风速、风向、O_(3)和CO_(2)浓度等)的影响,对采样和分析要求极高,而BVOCs样品的精准采集与分析是获取BVOCs排放因子... 植物源挥发性有机物(BVOCs)排放量约占全球总VOCs排放的90%,其排放易受环境因子(温度、光照、土壤水分、饱和水汽压差、风速、风向、O_(3)和CO_(2)浓度等)的影响,对采样和分析要求极高,而BVOCs样品的精准采集与分析是获取BVOCs排放因子的基础。该文综述了国内外BVOCs采样和分析方法,根据采样系统是否能控制或模拟环境因子(温度、湿度、光照强度、空气湍流、二氧化碳浓度等),对采样叶室的适用性进行了分析。其中光合仪-动态封闭系统可精准控制温度、光照强度、二氧化碳浓度,易使空气形成自然交换且便于外场测量,适用于大多数植物BVOCs排放测量。依托高塔、系留球、飞机等开展测量的开放式采样系统适用于外场的长期观测。PTR-MS、PTR-TOF-MS、Vocus-PTR-TOF等在线分析系统逐步得到应用。微型传感器已应用于BVOCs的快速检测,碳同位素分析法已应用于BVOCs合成转化过程中组分的探究。对采样和分析系统发展的研究,将为精准获取BVOCs排放因子并评估其环境效应提供依据。 展开更多
关键词 植物源挥发性有机物 动态封闭系统 便携式分析系统 微型传感器 碳同位素法
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Distribution of lightning spatial modes and climatic causes in China 被引量:2
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作者 Mingyi Xu Xiushu Qie +6 位作者 Chenxi Zhao Shanfeng Yuan Ji Li Yuyu Tao Guangyu Shi Wenjing Pang Lijuan Shi 《Atmospheric and Oceanic Science Letters》 CSCD 2023年第2期63-70,共8页
本文利用中国气象局国家雷电监测网(CNLDN)的地闪观测数据集,分析了2010-2020年中国陆地区域地闪空间模态分布特征及其可能的气候成因.研究发现,夏季地闪第一模态的方差贡献率为32.86%,其分布从北到南呈现出“-+-”的经向跷跷板模式,当... 本文利用中国气象局国家雷电监测网(CNLDN)的地闪观测数据集,分析了2010-2020年中国陆地区域地闪空间模态分布特征及其可能的气候成因.研究发现,夏季地闪第一模态的方差贡献率为32.86%,其分布从北到南呈现出“-+-”的经向跷跷板模式,当东太平洋和印度洋的海温异常增暖,西北太平洋的海温异常变冷时,在中国黄海,东海及热带西太平洋地区激发出气旋性环流,随着水汽南下至华南地区,与来自孟加拉湾的水汽汇合,上升运动在此加强,从而使得该地区的雷电活动增强.表明厄尔尼诺-南方涛动(ENSO)现象,是发生在中国陆地区域的地闪活动的气候驱动因子。 展开更多
关键词 雷电气候学 中国 云地闪 厄尔尼诺-南方涛动 太平洋
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Research on optimal intelligent routing algorithm for IoV with machine learning and smart contract 被引量:1
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作者 Baofeng Ji Mingkun Zhang +4 位作者 Ling Xing Xiaoli Li Chunguo Li Congzheng Han Hong Wen 《Digital Communications and Networks》 SCIE CSCD 2023年第1期47-55,共9页
The huge increase in the communication network rate has made the application fields and scenarios for vehicular ad hoc networks more abundant and diversified and proposed more requirements for the efficiency and quali... The huge increase in the communication network rate has made the application fields and scenarios for vehicular ad hoc networks more abundant and diversified and proposed more requirements for the efficiency and quality of data transmission.To improve the limited communication distance and poor communication quality of the Internet of Vehicles(IoV),an optimal intelligent routing algorithm is proposed in this paper.Combined multiweight decision algorithm with the greedy perimeter stateless routing protocol,designed and evaluated standardized function for link stability.Linear additive weighting is used to optimize link stability and distance to improve the packet delivery rate of the IoV.The blockchain system is used as the storage structure for relay data,and the smart contract incentive algorithm based on machine learning is used to encourage relay vehicles to provide more communication bandwidth for data packet transmission.The proposed scheme is simulated and analyzed under different scenarios and different parameters.The experimental results demonstrate that the proposed scheme can effectively reduce the packet loss rate and improve system performance. 展开更多
关键词 IoV Machine learning Smart contract Routing algorithm GPSR Relay transmission
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Decision Analysis on IoV Routing Transmission and Energy Efficiency Optimization Algorithm with AmBC
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作者 Baofeng Ji Mingkun Zhang +1 位作者 Weixing Wang Song Chen 《Computer Modeling in Engineering & Sciences》 SCIE EI 2023年第12期2661-2673,共13页
The improvement of the quality and efficiency of vehicle wireless network data transmission is always a key concern in the Internet of Vehicles(IoV).Routing transmission solved the limitation of transmission distance ... The improvement of the quality and efficiency of vehicle wireless network data transmission is always a key concern in the Internet of Vehicles(IoV).Routing transmission solved the limitation of transmission distance to a certain extent.Traditional routing algorithm cannot adapt to complex traffic environment,resulting in low transmission efficiency.In order to improve the transmission success rate and quality of vehicle network routing transmission,make the routing algorithm more suitable for complex traffic environment,and reduce transmission power consumption to improve energy efficiency,a comprehensive optimized routing transmission algorithm is proposed.Based on the routing transmission algorithm,an optimization algorithmbased on road condition,vehicle status and network performance is proposed to improve the success rate of routing transmission in the IoV.Relative distance difference and density are used as decision-making indicators to measure Road Side Unit(RSU)assisted transmission.And the Ambient backscatter communication(AmBC)technology and energy collection are used to reduce the energy consumption of routing relay transmission.An energy collection optimization algorithm is proposed to optimize the energy efficiency of AmBC and improve the energy efficiency of transmission.Simulation results show that the proposed routing optimization algorithm can effectively improve the success rate of packet transmission in vehicular ad hoc networks(VANETs),and theAmBC optimization algorithmcan effectively reduce energy consumption in the transmission process.The proposed optimization algorithm achieves comprehensive optimization of routing transmission performance and energy efficiency. 展开更多
关键词 IoV routing algorithm AmBC RELAY TRANSMISSION
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Value-Added Products Derived from 15 Years of High-Quality Surface Solar Radiation Measurements at Xianghe,a Suburban Site in the North China Plain
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作者 Mengqi LIU Xuehua FAN +2 位作者 Xiang'ao XIA Jinqiang ZHANG Jun LI 《Advances in Atmospheric Sciences》 SCIE CAS CSCD 2023年第6期1132-1141,共10页
Surface solar radiation(SSR) is a key component of the energy budget of the Earth’s surface, and it varies at different spatial and temporal scales. Considerable knowledge of how and why SSR varies is crucial to a be... Surface solar radiation(SSR) is a key component of the energy budget of the Earth’s surface, and it varies at different spatial and temporal scales. Considerable knowledge of how and why SSR varies is crucial to a better understanding of climate change, which surely requires long-term measurements of high quality. The objective of this study is to introduce a value-added SSR dataset from Oct 2004 to Oct 2019 based on measurements taken at Xianghe, a suburban site in the North China Plain;two value-added products based on the 1-minute SSR measurements are developed. The first is clear sky detection by using a machine learning model. The second is cloud fraction estimation derived from an effective semiempirical method. A “brightening” of global horizontal irradiance(GHI) was revealed and found to occur under both clear and cloudy conditions. This could likely be attributed to a reduction in aerosol loading and cloud fraction. This dataset could not only improve our knowledge of the variability and trend of SSR in the North China Plain, but also be beneficial for solar energy assessment and forecasting. 展开更多
关键词 surface solar radiation clear sky detection cloud fraction North China Plain
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LLSDA: Design and Implementation of Lightning Location Data Analysis and Visualization
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作者 Rong FAN Jingxiao LI Mingyuan LIU 《Meteorological and Environmental Research》 CAS 2023年第5期36-41,44,共7页
Visualizing lightning location data is necessary in analyzing and researching lightning activity patterns.This article uses C#and the cross-platform.NET framework to develop a lightning location data analysis class li... Visualizing lightning location data is necessary in analyzing and researching lightning activity patterns.This article uses C#and the cross-platform.NET framework to develop a lightning location data analysis class library and the data-driven client to help lightning researchers improve work efficiency by avoiding repeated wheel invention.Lightning Location System Data Analyzer(LLSDA)is a suite of software tools that includes a.NET class library for software developers and a desktop application for end users.It supports a wide range of lightning location data formats,such as the University of Washington Global Lightning Location System(WWLLN)and Beijing Huayun Dongfang ADTD Lightning Location System data format,and maintains scalability.The class library can easily read,parse,and analyze lightning location data,and combined with third-party frameworks can realize grid analysis.The desktop application can be combined with MeteoInfo(a GIS open-source project)for secondary development. 展开更多
关键词 Lightning location system The World Wide Lightning Location Network(WWLLN) ADTD MeteoInfo Global Lightning Detection Network(GLD360) Austrian Lightning Detection&Information System(ALDIS) Data-driven development Reusable software library
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临近空间大气环境研究现状 被引量:42
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作者 吕达仁 陈泽宇 +1 位作者 郭霞 田文寿 《力学进展》 EI CSCD 北大核心 2009年第6期674-682,共9页
临近空间指高度位于(20~100)km之间的地球大气层.简要综述临近空间的已有了解和研究前沿,包括基本状态、主要过程与控制因子.介绍了基于已有探测资料的经验模式的建立和基于基本物理定量规律和数值模拟方法的中层大气环流和化学气候数... 临近空间指高度位于(20~100)km之间的地球大气层.简要综述临近空间的已有了解和研究前沿,包括基本状态、主要过程与控制因子.介绍了基于已有探测资料的经验模式的建立和基于基本物理定量规律和数值模拟方法的中层大气环流和化学气候数值模拟.最后从临近空间大气环境保障应用角度提出研究的新建议. 展开更多
关键词 临近空间 中层大气 平流层 中间层 低热层
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内蒙古半干旱草原气候生态相互作用问题——IMGRASS计划初步结果 被引量:39
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作者 吕达仁 陈佐忠 +7 位作者 王庚辰 季劲钧 陈家宜 刘钟龄 陈洪滨 杜睿 雷霆 汪诗平 《地学前缘》 EI CAS CSCD 2002年第2期307-320,共14页
IMGRASS计划 (内蒙古半干旱草原土壤植被大气相互作用 )旨在通过野外实验、过程分析和数值模式研究理解中纬度半干旱草原气候生态相互作用中的多种时空尺度和多种物理化学生物学过程的作用 ,以及人类活动的影响。文中介绍部分与全球变... IMGRASS计划 (内蒙古半干旱草原土壤植被大气相互作用 )旨在通过野外实验、过程分析和数值模式研究理解中纬度半干旱草原气候生态相互作用中的多种时空尺度和多种物理化学生物学过程的作用 ,以及人类活动的影响。文中介绍部分与全球变化和人类活动相关的初步研究结果 ,主要是 :(1)冬季风、大区域地表环境和本区地形的结合对浑善达克沙地在长时间过程形成的作用 ;(2 )夏季风、本区地形和植被对本区夏季降水的水汽通道和降水分布有重要作用 ;(3)实验区内不同类型地表与土壤表现出明显不同的地气交换通量特征与不同的边界层结构 ;(4 )草原温室气体 (N2 O ,CH4 ,CO2 )收支的定量测量与过程研究表明 ,温带草原N2 O源强较IPCC 2 0 0 1报告估计值偏低 ,而草原CO2 收支表现出很强的变动性 ;(5 )人类活动干预下的草原退化与恢复演替表现出该区域普遍的规律与对气候的依赖 ,提供可持续发展的人类对自然草原放牧强度的阈值。 展开更多
关键词 陆-气相互作用 IMGRASS 半干旱草原 温室气体 中尺度模拟 BAHC 气候-生态相互作用 内蒙古
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内蒙古半干旱草原土壤-植被-大气相互作用综合研究 被引量:37
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作者 吕达仁 陈佐忠 +4 位作者 陈家宜 王庚辰 季劲钧 陈洪滨 刘钟龄 《气象学报》 CAS CSCD 北大核心 2005年第5期571-593,共23页
为深化对中纬度半干旱草原气候-生态相互作用过程、机制及其对全球变化的响应与贡献的认识,一项名为'内蒙古半干旱草原土壤-植被-大气相互作用(IMGRASS)'的基金重大项目于1997~2001年在内蒙古锡林郭勒草原执行.IMGRASS计划在1... 为深化对中纬度半干旱草原气候-生态相互作用过程、机制及其对全球变化的响应与贡献的认识,一项名为'内蒙古半干旱草原土壤-植被-大气相互作用(IMGRASS)'的基金重大项目于1997~2001年在内蒙古锡林郭勒草原执行.IMGRASS计划在1998年草原生长季节在所选定的以典型草原为主,包括草甸草原、稀疏沙地草原等在内的中尺度试验区开展了多点、多要素的综合观测.观测内容包括土壤、植被、大气的相关要素和发生于地-气界面的潜热、感热通量,还包括N2O,CH4,CO2等微量气体交换量、辐射与降水分布.除1998年中尺度观测试验外,1999~2001年在代表性地点进行了微量气体收支、遥感和沙尘天气相关的专项观测,结合草原站已进行的长期监测资料,分析气候-生态长期相互作用,特别是人类活动干预的影响.在分析观测结果的基础上,对该地区的气候-生态相互作用进行了数值模拟研究.文章简要介绍IMGRASS计划目标和初步成果,包括:计划目标与实验区背景;半干旱草原不同地表陆气相互作用特征;浑善达克沙地及其沙尘气溶胶特征;半干旱草原温室气体收支与碳循环测量分析;人类活动干预下半干旱草原生态退化与恢复演替规律;半干旱草原的遥感测量. 展开更多
关键词 内蒙古 半干旱草原 土壤 植被 大气 数值模拟 遥感测量
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