Pub Date : 2019-12-01DOI: 10.1109/ICMO49322.2019.9026041
Yin Chen, Jiajia Mao, Tao Li, Xuefen Zhang, Lei Wang
Based on the network observation data of seven stations in Beijing from 2018 to 2019, this paper proposes a set of comprehensive quality control and quality assessment method for the brightness temperature data of microwave radiometer. Different from other methods, this paper designs a quality control method for the influence of water film attached to the radome on the observation. In addition, in order to obtain more accurate simulation results, the Cloud Radar’s liquid water profile information is introduced when using the MonoRTM radiation transfer model to simulate the brightness temperature. The results of quality assessment show that the overall passing rate of bright temperature data of seven stations is above 67%, and the data availability rate is more than 70%. The availability of bright temperature of water vapor channel and oxygen channel increased by 3.74% and 1.38% respectively. The overall root mean square error of the seven sites before and after the deviation correction is 4.06K and 1.91K respectively.
{"title":"Comprehensive Quality Control Method and Effect Analysis of Brightness Temperature Data of Ground-based Microwave Radiometer","authors":"Yin Chen, Jiajia Mao, Tao Li, Xuefen Zhang, Lei Wang","doi":"10.1109/ICMO49322.2019.9026041","DOIUrl":"https://doi.org/10.1109/ICMO49322.2019.9026041","url":null,"abstract":"Based on the network observation data of seven stations in Beijing from 2018 to 2019, this paper proposes a set of comprehensive quality control and quality assessment method for the brightness temperature data of microwave radiometer. Different from other methods, this paper designs a quality control method for the influence of water film attached to the radome on the observation. In addition, in order to obtain more accurate simulation results, the Cloud Radar’s liquid water profile information is introduced when using the MonoRTM radiation transfer model to simulate the brightness temperature. The results of quality assessment show that the overall passing rate of bright temperature data of seven stations is above 67%, and the data availability rate is more than 70%. The availability of bright temperature of water vapor channel and oxygen channel increased by 3.74% and 1.38% respectively. The overall root mean square error of the seven sites before and after the deviation correction is 4.06K and 1.91K respectively.","PeriodicalId":257532,"journal":{"name":"2019 International Conference on Meteorology Observations (ICMO)","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121518474","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-12-01DOI: 10.1109/ICMO49322.2019.9025942
Zhihua Li, Yong She, Tao Liu
The raindrop spectrum detection technology based on optical principle is of great significance for the observation of precipitation phenomenon and the calibration of radar. In view of this background, the paper proposes a method of precipitation particle measuring system based on linear CCD. The system drives the CCD by the FPGA at high speed, which makes CCD can perfectly match the parallel light source to form the particle detection space, from which it can collect particle pixel information. Then the data processing part with FPGA as the core compares and compresses the collected data to obtain the accurate grayscale image information of the particles. Finally, the system transmits grayscale images to the PC in real time and at high speed by using Gigabit Ethernet. For the purpose of verifying the feasibility and accuracy of the system, two experiments were carried out respectively using steel balls of different diameters and dripping water to simulate the raindrop particles. By comparing and analyzing the experimental data, the results show that the system can basically restore the grayscale images of two simulated particles with good accuracy and consistency. The conclusion can be drawn that the measuring system can basically meet the measuring requirements of optical raindrop spectrum measuring instrument of high-speed, accurate and non-contact.
{"title":"Design of Precipitation Particle Measuring System Based on Linear CCD","authors":"Zhihua Li, Yong She, Tao Liu","doi":"10.1109/ICMO49322.2019.9025942","DOIUrl":"https://doi.org/10.1109/ICMO49322.2019.9025942","url":null,"abstract":"The raindrop spectrum detection technology based on optical principle is of great significance for the observation of precipitation phenomenon and the calibration of radar. In view of this background, the paper proposes a method of precipitation particle measuring system based on linear CCD. The system drives the CCD by the FPGA at high speed, which makes CCD can perfectly match the parallel light source to form the particle detection space, from which it can collect particle pixel information. Then the data processing part with FPGA as the core compares and compresses the collected data to obtain the accurate grayscale image information of the particles. Finally, the system transmits grayscale images to the PC in real time and at high speed by using Gigabit Ethernet. For the purpose of verifying the feasibility and accuracy of the system, two experiments were carried out respectively using steel balls of different diameters and dripping water to simulate the raindrop particles. By comparing and analyzing the experimental data, the results show that the system can basically restore the grayscale images of two simulated particles with good accuracy and consistency. The conclusion can be drawn that the measuring system can basically meet the measuring requirements of optical raindrop spectrum measuring instrument of high-speed, accurate and non-contact.","PeriodicalId":257532,"journal":{"name":"2019 International Conference on Meteorology Observations (ICMO)","volume":"2021 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125117782","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
This paper takes four typical lightning occur in Chengdu area as the research objects, analyzing the atmospheric electric field that before, during and after the lightning in time domain and frequency domain, selecting 30 minutes as the research time. It found that the volatility and amplitude of electric field intensity and the electric field gradient with time in local is small before the lightning occurs, lager and obvious during lightning occurs, decreasing after the lightning. Through the analysis of the energy, it found that the electric field energy is greater before lightning, the largest during lightning occurs, and reduced after the lightning in frequency domain. With the approach of the lightning, in frequency domain, the amplitude and energy of the electric field increases gradually, in the same time, curves fluctuate more obviously. Set the lightning warning level in time domain and frequency domain respectively and forecast lightning in Chengdu area as this standard, for further validating the effect on early warning system for lightning. The Ts score above 70%, missing report rate to zero, false alarm rate below 25%, which shows that these two warning levels can be effective to forecast near lightning warning.
{"title":"Research of Atmospheric Electric Field Characteristics in the Process of Lightning in Time and Frequency Domain","authors":"Lele Wang, Zaihua Guo, Qin Zhao, Huaiyu Li, Qingjun Li, Xueying Wu","doi":"10.1109/ICMO49322.2019.9026046","DOIUrl":"https://doi.org/10.1109/ICMO49322.2019.9026046","url":null,"abstract":"This paper takes four typical lightning occur in Chengdu area as the research objects, analyzing the atmospheric electric field that before, during and after the lightning in time domain and frequency domain, selecting 30 minutes as the research time. It found that the volatility and amplitude of electric field intensity and the electric field gradient with time in local is small before the lightning occurs, lager and obvious during lightning occurs, decreasing after the lightning. Through the analysis of the energy, it found that the electric field energy is greater before lightning, the largest during lightning occurs, and reduced after the lightning in frequency domain. With the approach of the lightning, in frequency domain, the amplitude and energy of the electric field increases gradually, in the same time, curves fluctuate more obviously. Set the lightning warning level in time domain and frequency domain respectively and forecast lightning in Chengdu area as this standard, for further validating the effect on early warning system for lightning. The Ts score above 70%, missing report rate to zero, false alarm rate below 25%, which shows that these two warning levels can be effective to forecast near lightning warning.","PeriodicalId":257532,"journal":{"name":"2019 International Conference on Meteorology Observations (ICMO)","volume":" 3","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"113947616","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-12-01DOI: 10.1109/ICMO49322.2019.9025911
Wenlin Chen, Debin Su, Lijuan Wang, Tonggen Wang
Observed data of each sampling height from P-band troposphere type □ wind profiler in Sichuan Yanyuan station(2466m ASL) and Qianwei station(486m ASL) in March 2018 is taken to study the temporal and spatial characteristics as well as the differences of wind shear from troposphere wind profiler at different altitudes. The values of horizontal wind speed and wind direction obtained by wind profiler are used to calculate the wind shear index at different time and different altitudes based on the power-law formula. By calculating vector difference and fitting the index on account of least square method, the vertical wind shear characteristics over the two stations are analyzed and compared with the products measured by wind profiler. The results show that the algorithm of wind shear index based on the power-law formula can preferable to reflect the wind shear characteristics of the wind field. The wind shear index tends to decrease with the increase of altitude because of the influence of the underlying surface on the wind speed. In addition, wind shear index also shows a trend of smaller in daytime, larger at night, smaller in plain area and larger in hilly area.
{"title":"Observation Analysis of Wind Shear Characteristics from Troposphere Wind Profiler","authors":"Wenlin Chen, Debin Su, Lijuan Wang, Tonggen Wang","doi":"10.1109/ICMO49322.2019.9025911","DOIUrl":"https://doi.org/10.1109/ICMO49322.2019.9025911","url":null,"abstract":"Observed data of each sampling height from P-band troposphere type □ wind profiler in Sichuan Yanyuan station(2466m ASL) and Qianwei station(486m ASL) in March 2018 is taken to study the temporal and spatial characteristics as well as the differences of wind shear from troposphere wind profiler at different altitudes. The values of horizontal wind speed and wind direction obtained by wind profiler are used to calculate the wind shear index at different time and different altitudes based on the power-law formula. By calculating vector difference and fitting the index on account of least square method, the vertical wind shear characteristics over the two stations are analyzed and compared with the products measured by wind profiler. The results show that the algorithm of wind shear index based on the power-law formula can preferable to reflect the wind shear characteristics of the wind field. The wind shear index tends to decrease with the increase of altitude because of the influence of the underlying surface on the wind speed. In addition, wind shear index also shows a trend of smaller in daytime, larger at night, smaller in plain area and larger in hilly area.","PeriodicalId":257532,"journal":{"name":"2019 International Conference on Meteorology Observations (ICMO)","volume":"321 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133615067","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-12-01DOI: 10.1109/ICMO49322.2019.9026021
Yuankai Song, W. Hao, Liu Gaoping, Zhu Pengfei, Ding Conghui, Zhao Sen
The lightning location system in Anhui province are introduced. Under the environment of SQL Server 2005, lightning location system database is established, unifying the lightning location data storage form and promoting the application of lightning location data and its secondary development. In combination with Doppler radar products, lightning nowcasting warning system has been developed. Strengthened The live monitoring, nowcasting forecast of lightning and early warning products published through web benefit the public a lot and supply the reference for forecasters in the process of early warning signal production.
介绍了安徽省雷电定位系统。在SQL Server 2005环境下，建立了闪电定位系统数据库，统一了闪电定位数据的存储形式，促进了闪电定位数据的应用和二次开发。结合多普勒雷达产品，研制了雷电临近预报预警系统。通过网络发布闪电实时监测、临近预报和预警产品，使公众受益匪浅，并为预报员在预警信号制作过程中提供了参考。
{"title":"Lightning Location System Database Construction And Application in AnHui Province","authors":"Yuankai Song, W. Hao, Liu Gaoping, Zhu Pengfei, Ding Conghui, Zhao Sen","doi":"10.1109/ICMO49322.2019.9026021","DOIUrl":"https://doi.org/10.1109/ICMO49322.2019.9026021","url":null,"abstract":"The lightning location system in Anhui province are introduced. Under the environment of SQL Server 2005, lightning location system database is established, unifying the lightning location data storage form and promoting the application of lightning location data and its secondary development. In combination with Doppler radar products, lightning nowcasting warning system has been developed. Strengthened The live monitoring, nowcasting forecast of lightning and early warning products published through web benefit the public a lot and supply the reference for forecasters in the process of early warning signal production.","PeriodicalId":257532,"journal":{"name":"2019 International Conference on Meteorology Observations (ICMO)","volume":"70 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131837391","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-12-01DOI: 10.1109/ICMO49322.2019.9025948
Yimeng Wang, Shanshan Lv, Wei Li
The National-level Meteorological Observation Real-time Operation Platform was built by the CMA Meteorological Observation Center (MOC) In 2019, which integrated national real-time meteorological observation operations, research-oriented operations and external display. The real-time operation platform adopted the office form of the meteorological cloud desktop system, so that the operating system, applications and data were all centralized to the data center for unified management. The system was based on the core technology of Independent Computing Architecture (ICA) protocol and relied on the construction of servers, network devices and storage, and by means of distributed deployment and virtual architecture, the release and management functions were realized. NVIDIA vGPU was also applied in the system to release a VDI virtual design desktop based on GPU graphics, which satisfied the 3D modeling and CUDA computing needs of operating staff. At present, 80 cloud desktop systems had been built on the real-time operation platform, and customized operating systems and supporting software applications had met the requirements. The internal and external network cloud desktop physical isolation completely solves the problems of traditional office equipment decentralized management, low data security factor, high operation and maintenance cost, and inability to achieve mobile office. The technical advantages and architecture design of the meteorological cloud desktop system, the design and deployment process of the system and the key technologies involved in the operation application were described in detail in this paper.
{"title":"The Meteorological Cloud Desktop System of CMA Meteorological Observation Center","authors":"Yimeng Wang, Shanshan Lv, Wei Li","doi":"10.1109/ICMO49322.2019.9025948","DOIUrl":"https://doi.org/10.1109/ICMO49322.2019.9025948","url":null,"abstract":"The National-level Meteorological Observation Real-time Operation Platform was built by the CMA Meteorological Observation Center (MOC) In 2019, which integrated national real-time meteorological observation operations, research-oriented operations and external display. The real-time operation platform adopted the office form of the meteorological cloud desktop system, so that the operating system, applications and data were all centralized to the data center for unified management. The system was based on the core technology of Independent Computing Architecture (ICA) protocol and relied on the construction of servers, network devices and storage, and by means of distributed deployment and virtual architecture, the release and management functions were realized. NVIDIA vGPU was also applied in the system to release a VDI virtual design desktop based on GPU graphics, which satisfied the 3D modeling and CUDA computing needs of operating staff. At present, 80 cloud desktop systems had been built on the real-time operation platform, and customized operating systems and supporting software applications had met the requirements. The internal and external network cloud desktop physical isolation completely solves the problems of traditional office equipment decentralized management, low data security factor, high operation and maintenance cost, and inability to achieve mobile office. The technical advantages and architecture design of the meteorological cloud desktop system, the design and deployment process of the system and the key technologies involved in the operation application were described in detail in this paper.","PeriodicalId":257532,"journal":{"name":"2019 International Conference on Meteorology Observations (ICMO)","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115038624","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-12-01DOI: 10.1109/ICMO49322.2019.9026071
Bing Qi, Rongguang Du, Yong Zhang, Deyun Hu, Huanqiang Yang, H. Sheng
Wind lidar can quickly detect wind profiles, which compensate for the shortcoming of the conventional sounding observation in high temporal and spatial resolution. Thus, it is very useful in the field of meteorology, wind power and aerospace. At present, various types of wind lidars measurement equipment are developed rapidly in China. To verify their detection performance, the synchronous observation data of three-type wind lidars were analyzed at Hangzhou National Reference Climate Station from January 16 to February 20, 2019, using the data of sounding observation and L-band stationary wind profiler as the reference. The results reveal that the median of the detected range is 1000-1500 m, but the data acquisition rates of threetype wind lidars show strongly difference at the height of 1000 m, with the value of 93%, 52%, 74%, respectively. The precipitation has an obvious influence on the detected range, which decreases by more than 50 %. The wind speed has a good relationship between wind lidar and L-band stationary wind profiler, with the correlation coefficient higher than 0.75 under the height of 2000 m, and the wind speed deviation is less than 1.5 m/s. Moreover, the wind direction angle deviation decreases with the increase of altitude, from 28 ° to 10 ° below the height of 1500 m. Compared with the sounding observation, the wind speed correlation of the three-type wind lidars is greater than 0.9, while the wind speed deviation is less than 1.0 m/s, and the wind direction angle deviation mainly decreases with the increase of altitude, with the value basically lower than 25 °. Furthermore, above the height of 600 m, the wind direction angle deviation between three-type wind lidars and the sounding observation has a better performance, with the value less than 15 °. These results can provide some technical and scientific reference for the reliable observation data of wind lidar.
{"title":"The Detection Performance of Different Wind Lidar","authors":"Bing Qi, Rongguang Du, Yong Zhang, Deyun Hu, Huanqiang Yang, H. Sheng","doi":"10.1109/ICMO49322.2019.9026071","DOIUrl":"https://doi.org/10.1109/ICMO49322.2019.9026071","url":null,"abstract":"Wind lidar can quickly detect wind profiles, which compensate for the shortcoming of the conventional sounding observation in high temporal and spatial resolution. Thus, it is very useful in the field of meteorology, wind power and aerospace. At present, various types of wind lidars measurement equipment are developed rapidly in China. To verify their detection performance, the synchronous observation data of three-type wind lidars were analyzed at Hangzhou National Reference Climate Station from January 16 to February 20, 2019, using the data of sounding observation and L-band stationary wind profiler as the reference. The results reveal that the median of the detected range is 1000-1500 m, but the data acquisition rates of threetype wind lidars show strongly difference at the height of 1000 m, with the value of 93%, 52%, 74%, respectively. The precipitation has an obvious influence on the detected range, which decreases by more than 50 %. The wind speed has a good relationship between wind lidar and L-band stationary wind profiler, with the correlation coefficient higher than 0.75 under the height of 2000 m, and the wind speed deviation is less than 1.5 m/s. Moreover, the wind direction angle deviation decreases with the increase of altitude, from 28 ° to 10 ° below the height of 1500 m. Compared with the sounding observation, the wind speed correlation of the three-type wind lidars is greater than 0.9, while the wind speed deviation is less than 1.0 m/s, and the wind direction angle deviation mainly decreases with the increase of altitude, with the value basically lower than 25 °. Furthermore, above the height of 600 m, the wind direction angle deviation between three-type wind lidars and the sounding observation has a better performance, with the value less than 15 °. These results can provide some technical and scientific reference for the reliable observation data of wind lidar.","PeriodicalId":257532,"journal":{"name":"2019 International Conference on Meteorology Observations (ICMO)","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114491307","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-12-01DOI: 10.1109/ICMO49322.2019.9025956
Yuan Liu, Jianxia Guo
The sea surface vector winds drive and modulate the heat and momentum transfer through the oceanatmosphere interface, influence the thermal and dynamical properties of ocean water body, and consequently determine the water cycle, ocean circulation and climate change on global scale. The spatial variation of sea surface winds is an important driving force for ocean dynamics. The vorticity of sea surface winds drives the ocean circulation through Sverdrup transport on basin scale, the divergence of surface winds efficiently affects the Ekman pumping, and thus the physical and biological processes over the global oceans.With the increasing sampling frequencies of satellite-borne scatterometer, it is vitally important to construct a long-time series of sea surface blended wind product for climate studies and numerical modeling studies as the forcing field. Previous studies have shown that wind fields with different spatial and temporal resolution have an apparent influence on numerical model results. Using the scatterometer winds and operational numerical model winds, this thesis aims to find an optimal wind blending method to merge winds from different sources, while effectively to retain the vorticity and divergence information in the blended wind products. The main findings of the thesis are listed as follows:Based on the 2-dimensional varational method (2DVAR) for wind blending, regularized terms for wind vorticity and divergence were introduced in the methodology to overcome the over-fitting problems associated with the 2DVAR method, and to retain the fine structure of scatterometer observed wind vorticity and divergence.Using the insitu wind observations in South China Sea, the QuikSCAT scatterometer winds and the global operational numerical prediction model winds of National Oceanic and Atmospheric Administratiton (NOAA) of the United States were evaluated. The analysis indicates that the accuracy and spatial/temporal variation of the sea surface winds are both reasonably good.Sensitivity studies of 2DVAR method with and without regularization of wind vorticity and divergence were performed for a typhoon case in 2008. The sensitivity studies show that 2DVAR with regularization effectively overcomes the over-fitting problems with smoother blended wind field. The spurious structure of false vorticity and divergence was effectively removed.The blended wind products with and without regularization terms in 2DVAR method were then evaluated using wind observations from an automatic meteorological observatorythan that produced from simple 2DVAR method, in terms of small bias and small root mean square errors (RMSE).As a final remark, the method described in this study can in South China Sea. The blended wind with regularization is more accurate in comparison with the insitu observation significantly reduce the noise level of scatterometer winds and keep the necessary information of wind vorticity and divergence. It is expected that the 2DVAR wind bl
{"title":"Research on the method of constructing sea surface blended wind product considering vorticity and divergence variation","authors":"Yuan Liu, Jianxia Guo","doi":"10.1109/ICMO49322.2019.9025956","DOIUrl":"https://doi.org/10.1109/ICMO49322.2019.9025956","url":null,"abstract":"The sea surface vector winds drive and modulate the heat and momentum transfer through the oceanatmosphere interface, influence the thermal and dynamical properties of ocean water body, and consequently determine the water cycle, ocean circulation and climate change on global scale. The spatial variation of sea surface winds is an important driving force for ocean dynamics. The vorticity of sea surface winds drives the ocean circulation through Sverdrup transport on basin scale, the divergence of surface winds efficiently affects the Ekman pumping, and thus the physical and biological processes over the global oceans.With the increasing sampling frequencies of satellite-borne scatterometer, it is vitally important to construct a long-time series of sea surface blended wind product for climate studies and numerical modeling studies as the forcing field. Previous studies have shown that wind fields with different spatial and temporal resolution have an apparent influence on numerical model results. Using the scatterometer winds and operational numerical model winds, this thesis aims to find an optimal wind blending method to merge winds from different sources, while effectively to retain the vorticity and divergence information in the blended wind products. The main findings of the thesis are listed as follows:Based on the 2-dimensional varational method (2DVAR) for wind blending, regularized terms for wind vorticity and divergence were introduced in the methodology to overcome the over-fitting problems associated with the 2DVAR method, and to retain the fine structure of scatterometer observed wind vorticity and divergence.Using the insitu wind observations in South China Sea, the QuikSCAT scatterometer winds and the global operational numerical prediction model winds of National Oceanic and Atmospheric Administratiton (NOAA) of the United States were evaluated. The analysis indicates that the accuracy and spatial/temporal variation of the sea surface winds are both reasonably good.Sensitivity studies of 2DVAR method with and without regularization of wind vorticity and divergence were performed for a typhoon case in 2008. The sensitivity studies show that 2DVAR with regularization effectively overcomes the over-fitting problems with smoother blended wind field. The spurious structure of false vorticity and divergence was effectively removed.The blended wind products with and without regularization terms in 2DVAR method were then evaluated using wind observations from an automatic meteorological observatorythan that produced from simple 2DVAR method, in terms of small bias and small root mean square errors (RMSE).As a final remark, the method described in this study can in South China Sea. The blended wind with regularization is more accurate in comparison with the insitu observation significantly reduce the noise level of scatterometer winds and keep the necessary information of wind vorticity and divergence. It is expected that the 2DVAR wind bl","PeriodicalId":257532,"journal":{"name":"2019 International Conference on Meteorology Observations (ICMO)","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123484604","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-12-01DOI: 10.1109/ICMO49322.2019.9026016
Zhendong Yao, Xiaojie Lou, Yongyan Su, Yong She, Lin Chen, Weifang Liu
Weather modification operation is important for Olympic Games, agriculture, environment and ecology etc. in China. Suitable weather background is required for this task. The atmospheric conditions can be obtained by dual-polarization weather radar which measuring and evaluating operation variables and has been developed. Such a magnetron radar is with advance of high radiation power, simple structure, small volume and light weight, its transmitter, receiver and signal processors can be put and fixed on the antenna elevation platform, can be omitted the influence of amplitude and phase fluctuation caused by the azimuth and elevation rotation joints. And the modern digital receiver and signal processor technologies making coherence on received and the radar detection performance perfect are employed to cancel the random initial phase and reject the slow frequency drifting for magnetron transmitter. Such a magnetron x band dual-linear polarization weather surveillance radar, so call MaXPol, has been built and installed in Weining County, Guizhou province in China at the end of August 2019. For some operation, several times of rainfall and small hail observations have been obtained. By analyzing the echoes it is shown that the polarization variables are good corresponding to those weather processes. The MaXPol radar with easy operation, accuracy data and effective application has been accepted for their weather modification operation.
{"title":"X-band Magnetron Dualpolarization Weather Radar","authors":"Zhendong Yao, Xiaojie Lou, Yongyan Su, Yong She, Lin Chen, Weifang Liu","doi":"10.1109/ICMO49322.2019.9026016","DOIUrl":"https://doi.org/10.1109/ICMO49322.2019.9026016","url":null,"abstract":"Weather modification operation is important for Olympic Games, agriculture, environment and ecology etc. in China. Suitable weather background is required for this task. The atmospheric conditions can be obtained by dual-polarization weather radar which measuring and evaluating operation variables and has been developed. Such a magnetron radar is with advance of high radiation power, simple structure, small volume and light weight, its transmitter, receiver and signal processors can be put and fixed on the antenna elevation platform, can be omitted the influence of amplitude and phase fluctuation caused by the azimuth and elevation rotation joints. And the modern digital receiver and signal processor technologies making coherence on received and the radar detection performance perfect are employed to cancel the random initial phase and reject the slow frequency drifting for magnetron transmitter. Such a magnetron x band dual-linear polarization weather surveillance radar, so call MaXPol, has been built and installed in Weining County, Guizhou province in China at the end of August 2019. For some operation, several times of rainfall and small hail observations have been obtained. By analyzing the echoes it is shown that the polarization variables are good corresponding to those weather processes. The MaXPol radar with easy operation, accuracy data and effective application has been accepted for their weather modification operation.","PeriodicalId":257532,"journal":{"name":"2019 International Conference on Meteorology Observations (ICMO)","volume":"62 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125057695","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-12-01DOI: 10.1109/ICMO49322.2019.9025961
X. Fang, W. Qiang, Du Zhengjing, Yang Chaomei
Fanjing Mountain scenic spot with the highest altitude of 2572m, is a 5A level scenic spot in Guizhou Province and it belongs to Jiangkou county with the altitude of 362m. Due to the obvious difference in altitude, historical observation data of Jiangkou county can not well reflect the historical climate characteristics of Fanjing Mountain scenic spot.In this paper, a multiple regression model is established based on the observation elements of temperature, humidity, wind, rainfall and other automatic stations in Fanjing Mountain scenic spot and Jiangkou county on the same day from 2016 to 2018. The differences of temperature, humidity, wind etc. and tourism climate suitability between Fanjing Mountain scenic spot and Jiangkou county were analyzed. The results show: The simulation value of average temperature error between $pm 2^circ$ in regression model accounts for 70.8%, and the maximum temperature error is slightly higher,but they are better than the calculated values of temperature decline rate. The ratio of average relative humidity error within $pm 10%$ is 75.8%.The average maximum temperature in Fanjing Mountain of reconstruction historical data from 1980 to 2014 is 12.8${^circ}$, and the average annual temperature is 8.7 ${^circ}$, which is 8.4${^circ}$ and 7.7${^circ}$ lower than Jiangkou county respectively. They are about 5${^circ}$ higher than the calculated values of temperature decline rate.InJiangkou county, the average temperature and the maximum temperature in 35 years shows an upward trend, but the annual change trend of Fanjing Mountain temperature is not obvious. The annual average humidity (94%) and wind speed (4.8m/s) in Fanjing Mountain are higher than those of Jiangkou county (80.8% and 1.2m/s), and their annual change trend is consistent with that of Jiangkou county, showing a downward trend. The tourism climate suitability of Fanjing Mountain and Jiangkoucounty is analyzed comparatively. The winter tourism climate suitability of Jiangkou county is general, the rest months are suitable, and the tourism climate suitability index in July and August is lower than 70. However, Fanjing Mountain is suitable in summer, and its tourism climate suitability index is higher than 70, but its tourism suitability is poor from January to April and from October to December. The reconstruction of historical data of Fanjing Mountain scenic spot provides data support for the analysis of three-dimensional tourism climate resources and the development of summer tourism economy.
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