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Validation of Column-Averaged Dry-Air Mole Fraction of CO_2 Retrieved from OCO-2 Using Ground-Based FTS Measurements

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Journal of Meteorological Research 2018年第3期32卷 433-443页

作者： yanmeng bi Qian WANG Zhongdong YANG Jie CHEN Wenguang BAI National Satellite Meteorological Center China Meteorological Administration

In order to correctly use the column-averaged atmospheric COdry-air mole fraction(XCO) data in the COflux studies, XCOmeasurements retrieved from the Orbiting Carbon Observatory-2(OCO-2) in 2015 were compared with those obtained from the global ground-based high-resolution Fourier Transform Spectrometer(FTS) participating in the Total Carbon Column Observing Network(TCCON). The XCOretrieved from three observing modes adopted by OCO-2, i.e., nadir, target, and glint, were separately validated by the FTS measurements at up to eight TCCON stations located in different areas. These comparisons show that OCO-2 glint mode yields the best qualitative estimations of COconcentration among the three operational approaches. The overall results regarding the glint mode show no obvious systematic biases. These facts may indicate that the glint concept is appropriate for not only oceans but also land regions. Negative systematic biases in nadir and target modes have been found at most TCCON sites. The standard deviations of XCOretrieved from target and nadir modes within the observation period are similar, and larger than those from glint mode. We also used the FTS site in Beijing, China, to assess the OCO-2 XCOin 2016. This site is located in a typical urban area, which has been absent in previous studies. Overall, OCO-2 XCOagrees well with that from FTS at this site. Such a study will benefit the validation of the newly launched TanSat products in China.

关键词： Orbiting Carbon Observatory-2(OCO-2) Fourier Transform Spectrometer(FTS) carbon dioxide(CO2) validation

Responses of Saline Soil Properties and Cotton Growth to Different Organic Amendments

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Pedosphere 2018年第3期28卷 521-529页

作者： WU Yupeng LI Yufei ZHANG Yi bi yanmeng SUN Zhenjun College of Resources and Environment Huazhong Agricultural University Wuhan 430070( China) College of Resources and Environmental Sciences China Agricultural University Beijing 100194( China) Institute of Plant Nutrition and Resources Beijing Academy of Agriculture and Forestry Sciences Beijing 100097( China) School of Environmental Science and Engineering Southern University of Science and Technology Shenzhen 518000( China)

Application of organic waste to saline alkaline soils is considered to be a good practice for soil remediation. The effects of applying different organic amendments （e.g., cattle dung, vermicompost, biofertilizer） and earthworm inoculations （Eisenia fetida） on saline soils and cotton growth were investigated during i year of cotton cultivation. Compared to the control （applied with inorganic NPK fertilizer）, applying organic amendments improved soil physicochemical properties. biofertilizer application improved available nutrient content, reduced short-term soil electrical conductivity, and produced the highest cotton yield, whereas cattle dung and vermicompost applications resulted in higher soil organic matter content. Application of organic amendments significantly increased soil microbial biomass carbon during the flowering period, which sharply declined at harvest. This was especially true for the biofertilizer treatment, which also exhibited lower nematode abundance compared with the other organic materials. Earthworm inoculation following cattle dung application failed to significantly change soil physicochemical properties when compared to the treatments without earthworm inoculation. Results suggest that biofertilizer application to saline soil would improve soil nutrient status in the short-term, whereas cattle dung application would improve soil organic matter content and increase soil organism abundance to a greater extent. However, different strategies might be required for long-term saline soil remediation.

关键词： biofertilizer cattle dung earthworm inoculation saline soil remediation vermicompost

基于“阳化气,阴成形”理论探讨精液不液化不育的中医论治

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云南中医药大学学报 2024年第1期47卷 28-32页

作者：武娟娟郭东王荣毕研蒙金乡县中医院山东济宁272200 济宁医学院山东济宁272000

精液不液化症是近年来导致男性不育的主要常见病理原因之一。笔者基于《黄帝内经》中“阳化气,阴成形”理论体系探析精液不液化的基本病机,认为精液不液化的主要发病责之于肾之阴阳失衡,元阳亏虚,气化功能不足。在其治疗中我们应准确把... 详细信息

精液不液化症是近年来导致男性不育的主要常见病理原因之一。笔者基于《黄帝内经》中“阳化气,阴成形”理论体系探析精液不液化的基本病机,认为精液不液化的主要发病责之于肾之阴阳失衡,元阳亏虚,气化功能不足。在其治疗中我们应准确把握和调和阴阳平衡、温阳化气的基本治疗原则,善用阴中求阳之法,在温阳时佐以滋阴,使阳得阴助而生化无穷。

关键词：精液不液化阳化气阴成形阳痿不育

Retrieval of global terrestrial solar-induced chlorophyll fluorescence from TanSat satellite

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Science Bulletin 2018年第22期63卷 1502-1512页

作者： Shanshan Du Liangyun Liu Xinjie Liu Xiao Zhang Xingying Zhang yanmeng bi Lianchong Zhang Key Laboratory of Digital Earth Science Institute of Remote Sensing and Digital EarthChinese Academy of SciencesBeijing 100094China University of Chinese Academy of Sciences Beijing 100049China National Satellite Meteorological Center China Meteorological AdministrationBeijing 100081China

The first Chinese Carbon Dioxide Observation Satellite Mission(TanSat), which was launched on December 21, 2016, is intended to measure atmospheric CO_2 *** high spectral resolution(0.044 nm) and high SNR(360 at 15.2 mW m^(-1) sr^(-1) nm^(-1)) measurements in the region of the O_2-A band of the Atmospheric Carbon dioxide Grating Spectroradiometer(AGCS) module onboard TanSat make it possible to retrieve solar-induced chlorophyll fluorescence(SIF) from TanSat observations at the global *** paper aims to explore the potential of the TanSat data for global SIF retrieval.A singular vector decomposition(SVD) statistical method was employed to retrieve SIF using radiance over a micro spectral window(～2 nm) around the Fe Fraunhofer lines(centered at 758.8 nm).The global SIF at 758.8 nm was successfully retrieved with a low residual error of 0.03 mW m^(-1) sr^(-1) nm^(-1).The results show that the spatial and temporal patterns of the retrieved SIF agree well with the global terrestrial vegetation *** monthly SIF products retrieved from the TanSat data were compared with other remote sensing datasets, including OCO-2 SIF, MODIS NDVI, EVI and *** overall consistency between TanSat and OCO-2 SIF products(R^2= 0.86) and the consistency of the spatial patterns and temporal variations between the TanSat SIF and MODIS vegetation indices and GPP enhance our confidence in the potential and feasibility of TanSat data for SIF ***, therefore, provides a new opportunity for global sampling of SIF at fine spatial resolution(2 km × 2 km), thus improving photosynthesis observations from space.

关键词： TanSat Solar-induced chlorophyll fluorescence Singular vector decomposition Vegetation index MODIS OCO-2 GPP

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卫星微波高层探测通道定标精度评估

大气科学 2024年第2期48卷 602-618页

作者：毕研盟李娟吴春强安大伟韩阳廖蜜徐唯伟胡菊旸窦芳丽李小青许健民气象卫星创新中心北京100081 中国气象局中国遥感卫星辐射测量和定标重点开放实验室北京100081 国家卫星气象中心北京100081 中国气象局地球系统数值预报中心北京100081

全球/区域数值预报同化系统所需要的重要资料来源之一是卫星微波遥感的亮温数据。微波遥感仪器的高层大气(平流层中上部)探测通道亮温的定标精度,受多种因素影响,存在一定的偏差。由于高层大气高精度探测资料相对比较匮乏,因此对微波遥... 详细信息

全球/区域数值预报同化系统所需要的重要资料来源之一是卫星微波遥感的亮温数据。微波遥感仪器的高层大气(平流层中上部)探测通道亮温的定标精度,受多种因素影响,存在一定的偏差。由于高层大气高精度探测资料相对比较匮乏,因此对微波遥感的高层大气亮温的精度检验评估成为重要研究内容。本文对在轨运行的微波温度遥感器AMSU-A、ATMS和FY-3D MWTS-2在2020年观测数据进行了定标精度检验评估,综合使用了三种评估方法进行了较为全面的分析,即基于掩星资料、再分析资料的辐射传输模拟比较和同类仪器交叉定标比较。三种检验评估方法从不同角度揭示了各仪器高层大气探测通道观测资料的误差特征,分析了对比误差的可能来源。三种评估方案给出的高层通道亮温的偏差存在差异,但基本结果变化趋势是一致的,即高层通道相比中低层通道,存在较大的噪音。除了交叉定标方法,其它两种方法都检验出了高层资料偏差的季节变化;整体而言,AMSU-A表现要优于MWTS-2和ATMS。本研究评估的高层亮温偏差的时间、空间变化特征可为微波高层大气资料的同化、气候应用提供参考。

关键词：微波遥感掩星辐射传输交叉定标

Validation results of NmF2 and hmF2 derived from ionospheric density profiles of GNOS on FY-3C satellite

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Science China(Technological Sciences) 2018年第9期61卷 1372-1383页

作者： YANG GuangLin SUN YueQiang BAI WeiHua ZHANG XiaoXin LIU CongLiang MENG XiangGuang bi yanmeng WANG DongWei ZHAO DanYang National Space Science Center China Academy of Sciences Beijing 100190 China Key Laboratory of Space Weather National Center for Space Weather China Meteorological Administration Beijing 100081 China National Satellite Meteorological Center Beijing 100081 China Beijing Key Laboratory of Space Environment Beijing 100190 China University of Chinese Academy of Sciences Beijing 100049 China

The first Global Navigation Satellite System Occultation Sounder(GNOS) which is compatible of both Bei Dou System(BDS)and Global Positioning System(GPS) was successfully launched into orbit onboard the Feng Yun 3 C satellite(FY-3 C) on September 23, 2013, and it has already gathered a large amount of ionosphere radio occultation(RO) data so far. However, the detailed analysis and validation of GPS ionosphere RO data have not been done up to now. Therefore, this paper discusses the configuration of the FY-3 C GNOS, the methods and results of GPS ionosphere occultation processment, the quality analysis of the GPS ionosphere RO products, and the precision consistency between the GNOS GPS ionosphere RO product and ionosonde data. The peak electron density(Nm F2) correlation coefficient is 0.97, the corresponding standard deviation is 16.08%. The peak value altitude(hm F2) correlation coefficient is 0.89, and the corresponding standard deviation is 23.79 km. The in-orbit operation of GNOS provides a basis data set for the monitoring, forecasting and research of ionosphere's space weather.

关键词： radio occultation Global Navigation Satellite System BeiDou System ionosphere

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微塑料污染防治国际实践及对我国的启示

环境监控与预警 2024年第3期16卷 99-104页

作者：侯聪邵红琪毕艳孟李维翠曹丽洁山东省生态环境监测中心山东济南250101 山东省科学技术情报研究院山东济南250101 天津城建大学环境与市政工程学院天津300384

微塑料作为一类新污染物,已成为国际社会普遍关注的热点环境问题。欧美国家微塑料污染防治工作启动较早,具有丰富的实践经验,这对完善我国微塑料污染防治体系具有重要的借鉴意义。从制度建设、国际合作、监测评估、科学研究等方面梳理... 详细信息

微塑料作为一类新污染物,已成为国际社会普遍关注的热点环境问题。欧美国家微塑料污染防治工作启动较早,具有丰富的实践经验,这对完善我国微塑料污染防治体系具有重要的借鉴意义。从制度建设、国际合作、监测评估、科学研究等方面梳理了国际社会微塑料污染防治的先进做法和实践经验,对比我国开展微塑料污染防治的相关政策和举措,分析了存在问题和短板;在此基础上,从强化顶层设计、健全协调机制、完善监测体系、重视科技支撑和加大宣传教育5个方面提出了对我国微塑料污染防治的启示。

关键词：微塑料政策科技支撑国际经验启示

Fast CO_(2) Retrieval Using a Semi-Physical Statistical Model for the High-Resolution Spectrometer on the Fengyun-3D Satellite

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Journal of Meteorological Research 2022年第2期36卷 374-386页

作者： yanmeng bi Peng ZHANG Zhongdong YANG Qian WANG Xingying ZHANG Chengbao LIU Pengmei XU Lizhou HOU Junyu KE Naiqiang ZHANG Innovation Center for Fengyun Meteorological Satellite Key Laboratory of Radiometric Calibration and Validation for Environmental SatellitesNational Satellite Meteorological CenterChina Meteorological AdministrationBeijing 100081 China Academy of Space Technology Beijing 100081 Huayun ShineTek Beijing 100081

China’s Fengyun-3D meteorological satellite launched in December 2016 carries the high-resolution greenhouse-gases absorption spectrometer(GAS)aimed at providing global observations of carbon dioxide(CO_(2)).To date,GAS is one of the few instruments measuring CO_(2) from the near-infrared *** orbit,the oxygen(O_(2))A band suffers a disturbance,and the signal-to-noise ratio(SNR)is significantly lower than the nominal *** leads to difficulties in the retrieval of surface pressure and hence a degradation of the retrieval of the column-averaged CO_(2) dry air mole fraction(XCO_(2))if a full physics retrieval algorithm is ***,a fast CO_(2) inverse method,named semi-physical statistical algorithm,was developed to overcome this *** instrument characteristics,the semi-physical statistical algorithm,and the results of comparison with ground-based measurements over land were introduced in this ***_(2) can be obtained from three bands,namely,the O_(2) A,weak CO_(2),and strong CO_(2) bands,with compensation from the Medium Resolution Spectral Imager-2(MERSI-2)products,ECMWF Reanaly-sis v5(ERA-5)data,and Total Carbon Column Observing Network(TCCON)*** eigenvectors of covariance matrices and the least square fits were used to derive retrieval coefficients and yield cloud-free *** addition to the GAS radiance,some key factors necessary for the accurate estimations of XCO_(2) were also taken as input information(e.g.,air mass,surface pressure,and a priori XCO_(2)).The global GAS XCO_(2) restricted over land was compared against the simultaneously collocated observations from *** retrieval algorithm can mitigate the issue caused by the low SNR of the O_(2) A band to a certain ***,through site-by-site comparisons,GAS XCO_(2) agreed well with the average precision(1σ)of 1.52 ppm and bias of−0.007 *** seasonal variation trends of GAS XCO_(2) can be clearly seen at TCCON sites on the 1-yr timescale.

关键词： carbon dioxide fast retrieval Fengyun-3 high-resolution spectrometer

Constructing temporal and spatial water vapor figures by GPS remote sensing along slant rays

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Science China Earth Sciences 2007年第2期50卷 296-305页

作者： MAO Hui MAO JieTai bi yanmeng LI ChengCai LIU XiaoYang Department of Atmospheric Sciences School of PhysicsPeking UniversityBeijing 100871China Shenzhen Meteorological Bureau Shenzhen 518001China

A Global Positioning System (GPS) receiver can generally track 5-7 rays from GPS satellites at any moment, and water vapor along these ray paths (slant-path water vapor, SWV) may be retrieved using the methods developed in recent years. This paper suggests two new parameters-absolute vertical SWV (VSWV) and relative VSWV derived from SWV, and their temporal and spatial figures can reflect the heterogeneous distribution and variation of water vapor field. This approach has been applied to the weather diagnoses in a severe storm event in Beijing during July 2004, and it is concluded that the temporal and spatial figures of absolute VSWV and relative VSWV can be useful in monitoring the evolution of water vapor field and be potential in better understanding the precipitation process.

关键词： GPS absolute VSWV relative VSWV water vapor precipitation