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Validation and accuracy analysis of wind products from scatterometer onboard the HY-2B satellite

Acta Oceanologica Sinica 2023年第2期42卷 74-82页

作者： Sheng Yang Bo Mu Haoqiang Shi Chaofei Ma Wu Zhou Juhong Zou mingsen lin National Satellite Ocean Application Service Ministry of Natural ResourcesBeijing100081China Key Laboratory of Space Ocean Remote Sensing and Application Ministry of Natural ResourcesBeijing100081China China Academy of Space Technology(Xi’an Branch) Xi’an710100China

The Chinese marine dynamic environment satellite HY-2B was launched in October 2018 and carries a Ku-band scatterometer.This paper focuses on the accuracies of HY-2B scatterometer wind data during the period from November 2018 to May 2021.The HY-2B wind data are validated against global moored buoys operated by the U.S.National Data Buoy Center and Tropical Atmosphere Ocean,numerical model data by the National Centers for Environmental Prediction,and the Advanced Scatterometer data issued by the Remote Sensing System.The results showed that the wind speeds and directions observed by the HY-2B scatterometer agree well with these buoy wind measurements.The root-mean-squared errors(RMSEs)of the HY-2B wind speed and direction are 0.74 m/s and 11.74°,respectively.For low wind speeds(less than 5 m/s),the standard deviation of the HY-2B-derived wind direction is higher than 20°,which implies that the HY-2B wind direction for low wind speeds is less accurate than that for moderate to high wind speed ranges.The RMSE of the HY-2B wind speed is slightly larger in high latitude oceans(60°–90°S and 60°–90°N)than in low latitude regions.Furthermore,the dependence of the residuals on the cross-track location of wind vector cells and the stability of the HY-2B scatterometer wind products are discussed.The wind stability assessment results indicate that a clear yearly oscillation is observed for the HY-2B wind speed bias which is due to seasonal weather variations.In general,the accuracy of HY-2B winds meets the operational precision requirement and is consistent with other wind data.

关键词： sea surface wind validation microwave remote sensing scatterometer

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Classification of ice and water in the Arctic using radar altimeter and microwave radiometer data from HY-2B satellite

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Acta Oceanologica Sinica 2023年第5期42卷 179-191页

作者： Chengfei Jiang mingsen lin Ruixue Cao Hao Wei Lijian Shi Bin Cheng Yongjun Jia Qimao Wang School of Marine Science and Technology Tianjin UniversityTianjin 300072China National Satellite Ocean Application Service Ministry of Natural ResourcesBeijing 100081China Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou) Guangzhou 511458China Key Laboratory of Space Ocean Remote Sensing and Application State Oceanic AdministrationBeijing 100081China College of Ocean and Meteorology Guangdong Ocean UniversityZhanjiang 524088China Finnish Meteorological Institute Helsinki FI-00560Finland

Several Chinese marine satellites have been launched in recent years.Monitoring sea ice and the ocean in the Arctic is of great importance for climate research.Sea ice in the Arctic has changed rapidly during the past few decades with respect to the extent and thickness.In this study,we applied combined passive and active microwave data from the Chinese HaiYang-2B(HY-2B)satellite to classify ice and sea water in the Arctic.We use data from a radar altimeter(RA)and a calibration microwave radiometer(CMR)to discriminate between ice and water by applying several approaches(1)the single parameter threshold criteria,(2)the multi-parameters linear segmentations and(3)the K-means clustering.The results yielded by these methods were in good agreement(classification accuracy>95%)with the Satellite Application Facility on Ocean and Sea Ice products between November and April.For other months(May–October),however,the agreement was less good(lowest classification accuracy approximate 85%in summer).A hybrid approach combined with graphical ice edges detection and microwave radar waveform analysis is therefore developed.A visual comparison with SAR images suggested the hybrid approach results greatly improved the ice and water discrimination in summer.This study demonstrated that multi-sensors(RA and CMR)configurations from HY satellites can offer comparable polar earth observation to the European Space Agency and NOAA satellite products.

关键词： Arctic active microwave data passive microwave data sea ice seawater

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Wind speed inversion and in-orbit assessment of the imaging altimeter on Tiangong-2 space station

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Acta Oceanologica Sinica 2020年第12期39卷 114-120页

作者： Youguang Zhang Qingliu Bao mingsen lin Shuyan Lang Key Laboratory of Space Ocean Remote Sensing and Application National Satellite Ocean Application ServiceBeijing 100081China Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou) Guangzhou 511458China Beijing Piesat Information Technology Co. Ltd.Beijing 100195China

Imaging altimeter(IALT)is a new type of radar altimeter system.In contrast to the conventional nadir-looking altimeters,such as HY-2 A altimeter,Jason-1/2,and TOPEX/Poseidon,IALT observes the earth surface at low incident angles(2.5°–8°),so its swath is much wider and its spatial resolution is much higher than the previous altimeters.This paper presents a wind speed inversion method for the recently launched IALT onboard Tiangong-2 space station.Since the current calibration results of IALT do not agree well with the well-known wind geophysical model function at low incidence angles,a neural network is used to retrieve the ocean surface wind speed in this study.The wind speed inversion accuracy is evaluated by comparing with the ECMWF reanalysis wind speed,buoy wind speed,and in-situ ship measurements.The results show that the retrieved wind speed bias is about–0.21 m/s,and the root-mean-square(RMS)error is about 1.85 m/s.The wind speed accuracy of IALT meets the performance requirement.

关键词： imaging altimeter ocean surface wind speed inversion accuracy analysis in-orbit assessment

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A comparison of multiplatform wind products in the South China Sea during summer and autumn in 2019

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Journal of Oceanology and Limnology 2021年第6期39卷 2181-2194页

作者： Yuxin LIU mingsen lin Xingwei JIANG Xiujun SUN Xiangzhou SONG Key Laboratory of Marine Hazards Forecasting Ministry of Natural ResourcesHohai UniversityNanjing 210098China National Satellite Ocean Application Service Beijing 100081China Key Laboratory of Space Ocean Remote Sensing and Application Ministry of Natural ResourcesBeijing 100081China Physical Oceanography Laboratory Ocean University of ChinaQingdao 266100China College of Oceanography Hohai UniversityNanjing 210098China

Sea surface wind(SSW)observations from a newly developed“Black Pearl”wave glider,the Chinese-French Oceanography Satellite(CFOSAT),the HY-2A microwave scatterometer,and a recently released high-resolution atmospheric reanalysis(ERA5)are evaluated with respect to in-situ buoy observations(115.46°E,19.85°N)from the South China Sea.Buoy observations from June to November 2019 are used to evaluate the wind estimates from the different platforms.The comparisons show that the HY-2A and CFOSAT scatterometer wind speeds have mean root mean square errors(RMSEs)of approximately 1.6 and 1.6 m/s,respectively,and the corresponding mean wind direction RMSEs are approximately 19°and 17°,which indicates that these satellite retrievals meet the requirements of design engineering missions.The wind speed and wind direction RMSEs of ERA5 are approximately 1.9 m/s and 33°,respectively.The correlation coefficients between the HY-2A,CFOSAT,and ERA5 wind speeds and the buoy observations are 0.86,0.85,and 0.84,respectively,and the corresponding coefficients of the wind direction are 0.98,0.98,and 0.93,respectively,at a 95%confidence level.However,the wind sensor in the wave glider provides relatively poor-quality observations compared with the buoy measurements and has higher wind speed and wind direction RMSEs of 2.9 m/s and 50.1°,respectively.Taylor diagrams are utilized to illustrate comprehensive wind comparisons between the multiplatform observations and buoy observations.The results help identify the basic biases in SSWs among different products and enhance confidence in the future use of SSW data for studies of upper ocean dynamics and climate analysis.Suggestions are also off ered to help improve the design of next-generation wave gliders.

关键词： sea surface wind(SSW) calibration South China Sea(SCS) wave glider fi fth European Centre for Medium-Range Weather Forecasts reanalysis(ERA5) HY-2A Chinese-French Oceanography Satellite(CFOSAT)

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The HY-2 satellite and its preliminary assessment

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International Journal of Digital Earth 2012年第3期5卷 266-281页

作者： Xingwei Jiang mingsen lin Jianqiang Liu Youguang Zhang Xuetong Xie Hailong Peng Wu Zhou National Satellite Ocean Application Service SOAChina

The HY-2 satellite was successfully launched on 16 August 2011.It carried four microwave instruments into space for operationally observing dynamic ocean environment parameters on a global scale.The HY-2 satellite altimeter provides sea surface height(SSH),significant wave height(SWH),sea surface wind(SSW)speed,and polar ice sheet elevation,while the HY-2 satellite scatterometer provides SSW fields.At the same time,other oceanic and atmospheric parameters such as sea surface temperature(SST)and wind speed,water vapor and liquid water content can also be obtained by its onboard scanning microwave radiometer.In this paper,we show the data processing methods of the HY-2 satellite’s payloads.The preliminary results show that wind vector,SSH,SWH,and SST conform to the designed technical specifications.

关键词： HY-2 satellite radar altimeter microwave scatterometer scanning microwave radiometer algorithm processing

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Current Status and Main Application Achievements of Ocean Satellites

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空间科学学报 2022年第4期42卷 733-743页

作者： lin mingsen ZHANG Youguang National Satellite Ocean Application Service Beijing 100081

Ocean satellites have realized multi-satellite networked operation.The HY-1D satellite launched in June 2020 realized networked with HY-1C satellite,and completed the construction of ocean color satellite constellation.The HY-2D satellite launched in May 2021 is networked with the on orbit HY-2B and HY-2C satellites to complete the construction of marine dynamic environment satellite constellation.The 1 mC-SAR satellite 01 launched in November 2021 is networked with GF-3,which initially forms the marine monitoring satellite constellation.This year,the networking of 1 mC-SAR satellite 02 with satellite 01 and GF-3 is realized,and the construction of marine monitoring satellite constellation is completed.At present,the ocean satellites have the operational application capabilities of remote sensing investigation,monitoring,evaluation and supervision of marine ecology,marine disaster prevention and reduction,global oceans and Polar Regions,Sea Islands,rights and interests maintenance.

关键词： Ocean color satellite Ocean dynamic environment satellite Ocean monitoring satellite Satellite networking

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Preliminary calibration results of the HY-2B altimeter’s SSH at China’s Wanshan calibration site

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Acta Oceanologica Sinica 2021年第5期40卷 129-140页

作者： Chuntao Chen Jianhua Zhu Chaofei Ma mingsen lin Longhao Yan Xiaoqi Huang Wanlin Zhai Bo Mu Yongjun Jia School of Ocean Yantai UniversityYantai 264005China National Ocean Technology Center Ministry of Natural ResourcesTianjin 300112China National Satellite Ocean Application Service Ministry of Natural ResourcesBeijing 100081China

Satellite altimeter needs to be calibrated to evaluate the accuracy of sea surface height data.The dedicated altimeter calibration field needs to establish a special calibration strategy and needs to evaluate its calibration ability.This paper describes absolute calibration of HY-2 B altimeter SSH using the GPS calibration method at the newly Wanshan calibration site,located in the Wanshan Islands,China.There are two HY-2 B altimeter passes across the Wanshan calibration site.Pass No.362 is descending and the ground track passes the east of Dan’gan Island.Pass No.375 is ascending and crosses the Zhiwan Island.The GPS data processing strategy of Wanshan calibration site was established and the accuracy of GPS calibration method of Wanshan calibration site was evaluated.Meanwhile,the processing strategies of the HY-2 B altimeter for the Wanshan calibration site were established,and a dedicated geoid model data were used to benefit the calibration accuracy.The time-averaged HY-2 B altimeter bias was approximately 2.12 cm with a standard deviation of 2.08 cm.The performance of the HY-2 B correction microwave radiometer was also evaluated in terms of the wet troposphere path delay and showed a mean difference-0.2 cm with a 1.4 cm standard deviation with respect to the in situ GPS radiosonde.

关键词： calibration HY-2B altimeter Wanshan calibration site GPS buoy

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Estimating the Baseline Error of Wide-Swath Altimeters Using Nadir Altimeters via Numerical Simulation

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Journal of Ocean University of China 2022年第3期21卷 681-693页

作者： MIAO Xiangying JIA Yongjun lin mingsen MIAO Hongli College of Information Science and Engineering Ocean University of ChinaQingdao266100China National Satellite Ocean Application Service(NSOAS) Beijing100081China

The baseline roll and length errors for wide-swath altimeters are major error sources in sea surface measurements that exhibit strong spatial characteristics in the cross-track direction.These errors can be identified and estimated in accordance with height differences at crossover points generated with nadir altimeters after excluding the interference from other error sources.Most of the wide-swath altimeter baseline estimation methods considered only the roll error in previous studies.A numerical simulation was conducted in this study using nadir altimeters to estimate the roll and length errors simultaneously to provide a selectable scheme for baseline error estimation and correction for future wide-swath altimeters.Results based on the parameters of the surface water and ocean topography mission and Sentinel-3A show that the correlation coefficient of the roll error between the estimated and simulated values is 0.89,while the correlation coefficient of the length error is 0.85.The sea surface height root mean square error(RMSE)can be reduced from 12.18 cm to 6.45 cm based on the two estimated results.The estimation effect can be increased by using multiple nadir altimeters to form an observation constellation.The numerical simulation of the five nadir altimeter constellation shows that the correlation coefficients of the roll and length errors would increase to 0.97,which reduces the sea surface height RMSE to 2.88 cm.In addition,the stability of this method is indicated in simulation experiments,which introduce different degrees of sea state errors.

关键词： baseline error wide-swath altimeter roll angle baseline length nadir altimeter crossover point height difference

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自动化钢筋直螺纹滚轧成形仿真分析策略研究

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市场监管与质量技术研究 2024年第1期 2-5页

作者：林伙川徐明森巫红平福建省产品质量检验研究院福建福州350002

针对当前钢筋直螺纹滚轧成形仿真分析中存在的人工操作强度大、建模效率低等问题,研究集成Visual Studio、Creo Parametric和ANSYS等开发、建模与仿真分析环境的自动化钢筋直螺纹滚轧成形仿真分析机制,提出自动化仿真系统的体系结构,构... 详细信息

针对当前钢筋直螺纹滚轧成形仿真分析中存在的人工操作强度大、建模效率低等问题,研究集成Visual Studio、Creo Parametric和ANSYS等开发、建模与仿真分析环境的自动化钢筋直螺纹滚轧成形仿真分析机制,提出自动化仿真系统的体系结构,构建自动化仿真分析工作流程,开发交互界面友好的自动化分析系统。进而以某钢筋直螺纹滚轧成形仿真分析为例对系统进行测试,结果表明,自动化仿真分析系统不仅能够自动完成钢筋直螺纹成形加工系统中滚轧轮与钢筋毛坯件的实体建模、滚轧成形仿真系统的有限元建模、滚轧成形有限元仿真分析结果提取等操作,而且具有操作简单方便、仿真效率高等优点。

关键词：钢筋直螺纹加工过程自动化有限元分析

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A robust interphase via in-situ pre-reconfiguring lithium anode surface for long-term lithium-oxygen batteries

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Journal of Energy Chemistry 2022年第9期31卷 186-194,I0006页

作者： Pan Xu Xiaodong lin Zongqiang Sun Kaixuan Li Wenjie Dou Qing Hou Zhiyou Zhou Jiawei Yan mingsen Zheng Ruming Yuan Quanfeng Dong Collaborative Innovation Centre of Chemistry for Energy Materials(iChEM) State Key Laboratory of Physical Chemistry of Solid SurfacesDepartment of ChemistryCollege of Chemistry and Chemical EngineeringEngineering Research Centre of Electrochemical Technologies of Ministry of EducationXiamen UniversityXiamen 361005FujianChina

Lithium-oxygen(Li-O) battery is considered as one of the most promising alternatives because of its ultrahigh theoretical energy density. However, their cycling stability is severely restricted by the uncontrollable dendrite growth and serious oxygen corrosion issue on Li surface. Herein, a sulfur-modified Li surface can be successfully constructed via chemical reaction of guanylthiourea(GTU) molecule on Li,which can induce the selectively fast decomposition of lithium bis(trifluoromethanesulfonyl)imide(LiTFSI) to form a smooth and stable inorganics-rich solid-electrolyte interphase(IR-SEI) during the subsequent electrochemical process. Such an IR-SEI cannot only offer a highly reversible and stable Li plating/stripping chemistry with dendrite-free property(10 mA cm^(-2)-10 mAh cm^(-2), > 0.5 years;3 mA cm^(-2)-3 m Ah cm^(-2), > 1 year) but also endows the Li metal an anti-oxygen corrosion function, thereby significantly improving the cycling stability of Li-Obatteries. This work provides a new idea for constructing functional solid-electrolyte interphase(SEI) to achieve highly stable Li metal anode.

关键词： Solid-electrolyte interphase Guanylthiourea Sulfur-modified Li surface Li metal Li-O_(2)batteries

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