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First Chinese ultraviolet-visible hyperspectral satellite instrument implicating global air quality during the COVID-19 pandemic in early 2020

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Light(Science & Applications) 2022年第2期11卷 242-253页

作者： cheng Liu Qihou Hu chengxin Zhang Congzi Xia Hao Yin Wenjing Su Xiaohan Wang Yizhou Xu Zhiguo Zhang department of Precision Machinery and Precision Instrumentation University of Science and Technology of China230026 HefeiChina Key Laboratory of environmental Optics and technology Anhui Institute of Optics and Fine MechanicsHefei Institutes of Physical ScienceChinese Academy of Sciences230031 HefeiChina center for Excellence in Regional Atmospheric environment Institute of Urban EnvironmentChinese Academy of Sciences361021 XiamenChina Key Laboratory of Precision Scientific Instrumentation of Anhui Higher Education Institutes University of Science and Technology of China230026 HefeiChina School of earth and Space sciences University of Science and Technology of China230026 HefeiChina department of environmental Science and Engineering University of Science and Technology of China230026 HefeiChina

In response to the COVID-19 pandemic,governments worldwide imposed lockdown measures in early 2020,resulting in notable reductions in air pollutant *** changes in air quality during the pandemic have been investigated in numerous studies via satellite ***,no relevant research has been gathered using Chinese satellite instruments,because the poor spectral quality makes it extremely difficult to retrieve data from the spectra of the environmental Trace Gases Monitoring Instrument(EMI),the first Chinese satellite-based ultraviolet–visible spectrometer monitoring air ***,through a series of remote sensing algorithm optimizations from spectral calibration to retrieval,we successfully retrieved global gaseous pollutants,such as nitrogen dioxide(NO2),sulfur dioxide(SO2),and formaldehyde(HCHO),from EMI during the *** abrupt drop in NO2 successfully captured the time for each city when effective measures were implemented to prevent the spread of the pandemic,for example,in January 2020 in Chinese cities,February in Seoul,and March in Tokyo and various cities across Europe and ***,significant decreases in HCHO in Wuhan,Shanghai,Guangzhou,and Seoul indicated that the majority of volatile organic compounds(VOCs)emissions were ***,the lack of evident reduction in Beijing and New Delhi suggested dominant natural sources of *** comparing the relative variation of NO2 to gross domestic product(GDP),we found that the COVID-19 pandemic had more influence on the secondary industry in china,while on the primary and tertiary industries in Korea and the countries across Europe and America.

关键词： ultraviolet visible dioxide

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Assimilation of the FY-4A AGRI Clear-Sky Radiance Data in a Regional Numerical Model and Its Impact on the Forecast of the“21·7”Henan Extremely Persistent Heavy Rainfall

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Advances in Atmospheric sciences 2023年第5期40卷 920-936页

作者： Lan XU Wei cheng Zhongren DENG Juanjuan LIU Bin WANG Bin LU Shudong WANG Li DONG State Key Laboratory of Numerical Modeling for Atmospheric sciences and Geophysical Fluid Dynamics Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China College of earth and Planetary sciences University of Chinese Academy of SciencesBeijing 100049China Beijing Institute of Applied Meteorology Beijing 100029China Key Laboratory of Meteorological Disaster of Ministry of Education(KLME)/Joint International research Laboratory of Climate and environment Change(ILCEC) Nanjing University of Information Science&TechnologyNanjing 210044China Institute of Urban Meteorology China Meteorological AdministrationBeijing 100089China Public Meteorological Service center China Meteorological AdministrationBeijing 100081China

Assimilation of the Advanced Geostationary Radiance Imager(AGRI)clear-sky radiance in a regional model is *** forecasting effectiveness of the assimilation of two water vapor(WV)channels with conventional observations for the“21·7”Henan extremely heavy rainfall is analyzed and compared with a baseline test that assimilates only conventional observations in this *** results show that the 24-h cumulative precipitation forecast by the assimilation experiment with the addition of the AGRI exceeds 500 mm,compared to a maximum value of 532.6 mm measured by the national meteorological stations,and that the location of the maximum precipitation is consistent with the *** results for the short periods of intense precipitation processes are that the simulation of the location and intensity of the 3-h cumulative precipitation is also relatively *** analysis increment shows that the main difference between the two sets of assimilation experiments is over the ocean due to the additional ocean observations provided by FY-4A,which compensates for the lack of ocean *** assimilation of satellite data adjusts the vertical and horizontal wind fields over the ocean by adjusting the atmospheric temperature and humidity,which ultimately results in a narrower and stronger WV transport path to the center of heavy precipitation in Zhengzhou in the lower ***,the WV convergence and upward motion in the control experiment are more dispersed;therefore,the precipitation centers are also correspondingly more dispersed.

关键词： FY-4A AGRI clear-sky radiance satellite data assimilation “21·7”Henan extremely persistent heavy rainfall

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Decadal Indian ocean Dipolar Variability and Its Relationship with the Tropical Pacific

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Advances in Atmospheric sciences 2017年第11期34卷 1282-1289页

作者： Yun YANG Jianping LI Lixin WU Yu KOSAKA Yan DU cheng SUN Fei XIE Juan FENG State Key Laboratory of earth Surface Processes and Resource Ecology and College of Global Change and earth System Science Beijing Normal UniversityBeijing 100875China Laboratory for Regional oceanography and Numerical Modeling Qingdao National Laboratory for Marine Science and Technologyqingdao 266237China Physical oceanography Laboratory/Qingdao Collaborative Innovation center of Marine Science and technology Ocean University of Chinaqingdao 266003China research center for Advanced Science and technology University of TokyoTokyo153-8904Japan State Key Laboratory of Tropical oceanography South China Sea Institute of OceanologyChinese Academy of Sciencesguangzhou 510301China

A robust decadal Indian ocean dipolar variability （DIOD） is identified in observations and found to be related to tropical Pacific decadal variability （TPDV）. A Pacific ocean-global atmosphere （POGA） experiment, with fixed radiative forcing, is conducted to evaluate the DIOD variability and its relationship with the TPDV. In this experiment, the sea surface temperature anomalies are restored to observations over the tropical Pacific, but left as interactive with the atmosphere elsewhere. The TPDV-forced DIOD, represented as the ensemble mean of 10 simulations in POGA, accounts for one third of the total variance. The forced DIOD is triggered by anomalous Walker circulation in response to the TPDV and develops following Bjerknes feedback. Thermocline anomalies do not exhibit a propagating signal, indicating an absence of oceanic planetary wave adjustment in the subtropical Indian ocean. The DIOD-TPDV correlation differs among the 10 simulations, with a low correlation corresponding to a strong internal DIOD independent of the TPDV. The variance of this internal DIOD depends on the background state in the Indian ocean, modulated by the thermocline depth off Sumatra/Java.

关键词： Indian ocean dipole decadal variability tropical Pacific decadal variability

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Automatic recognition of tweek atmospherics and plasma diagnostics in the lower ionosphere with the machine learning method

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earth and Planetary Physics 2023年第3期7卷 407-413页

作者： Mao Zhang GaoPeng Lu HaiLiang Huang ZhengWei cheng YaZhou Chen Steven A.Cummer JiaYi Zheng JiuHou Lei School of earth and Space sciences University of Science and Technology of ChinaHefei 230026China Key Laboratory of Atmospheric Optics Anhui Institute of Optics and Fine MechanicsHefei Institutes of Physical ScienceChinese Academy of SciencesHefei 230031China Collaborative Innovation center on Forecast and Evaluation of Meteorological Disasters Nanjing University of Information Science and TechnologyNanjing 210044China State Key Laboratory of Space Weather National Space Science CenterChinese Academy of SciencesBeijing 100190China National Key Laboratory on Electromagnetic environment Effects Army Engineering UniversityShijiazhuang CampusShijiazhuang 050003China Electrical and Computer Engineering department Duke UniversityDurhamNC 27708USA

Tweek atmospherics are extremely low frequency and very low frequency pulse signals with frequency dispersion characteristics that originate from lightning discharges and that propagate in the earth–ionosphere waveguide over long *** this study,we developed an automatic method to recognize tweek atmospherics and diagnose the lower ionosphere based on the machine learning *** differences(automatic−manual)in each ionosphere parameter between the automatic method and the manual method were−0.07±2.73 km,0.03±0.92 cm^(−3),and 91±1,068 km for the ionospheric reflection height(h),equivalent electron densities at reflection heights(Ne),and propagation distance(d),***,the automatic method is capable of recognizing higher harmonic tweek *** evaluation results of the model suggest that the automatic method is a powerful tool for investigating the long-term variations in the lower ionosphere.

关键词： machine learning method tweek atmospherics reflection height D-region ionosphere

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Review of studies on land use and land cover change in Nepal

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Journal of Mountain Science 2016年第4期13卷 643-660页

作者： Basanta PAUDEL ZHANG Yi-li LI Shi-cheng LIU Lin-shan WU Xue Narendra Raj KHANAL Key Laboratory of Land Surface Pattern and Simulation Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBering 100101China university of Chinese Academy of sciences Beijing 100049China CAS center for Excellence in Tibetan Plateau earth sciences Beijing 100101China Central department of Geography Tribhuvan UniversityKirtipurKathmandu 44613Nepal

Land use and land cover(LULC) in Nepal has undergone constant change over the past few decades due to major changes caused by anthropogenic and natural factors and their impacts on the national and regional environment and *** comprehensive review of past and present studies of land use and land cover change(LUCC) in Nepal concentrates on cropland, grassland, forest, snow/glacier cover and urban areas. While most small area studies have gathered data from different sources and research over a short period, across large areas most historical studies have been based on aerial photographs such as the Land Resource Mapping Project in 1986. The recent trend in studies in Nepal is to focus on new concepts and techniques to analyze LULC status on the basis of satellite imagery, with the help of geographic information system and remote sensing tools. Studies based on historical documents, and historical and recent spatial data on LULC, have clearly shown an increase in cropland areas in Nepal,and present results indicating different rates and magnitudes. A decrease in forest and snow/glacier coverage is reported in most studies. Little information is available on grassland and urban areas from past research. The unprecedented rate of urbanization in Nepal has led to significant urban land changes over the past 30 years. Meanwhile, long term historical LUCC research in Nepal is required for extensive work on spatially explicit reconstructions on the basis of historical and primary data collection, including LULC archives and drivers for future change.

关键词： Land use Land cover Geographic information system Remote sensing Nepal

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Spore-pollen-climate factor transfer function and paleoenvironment reconstruction in Dajiuhu,Shennongjia,Central china

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Chinese Science Bulletin 2008年第S1期53卷 42-49页

作者： ZHU cheng CHEN Xing ZHANG GuangSheng MA ChunMei ZHU Qing LI ZhongXuan XU WeiFeng School of Geographic and oceanographic sciences Nanjing UniversityNanjing 210093China department of Atmospheric sciences Nanjing UniversityNanjing 210093China

The identified results of 121 surface sediment spore-pollen samples in Shennongjia and meteorological data base of 30 years(January,1971―December,2000)of 7 meteorological stations around Dajiuhu, Shennongjia are used in this *** 55 species of common spore-pollen with the method of space fitting and stepwise regression we construct the pollen climate factor transfer function of annual mean tem- perature:T=7.649-2.33097X Abies -0.10873X Betula -0.17352X Compositae -0.13176X Cruciferae +0.13356XEuphorbiaceae -0.83069X Campanulaceae +1.96494XPyrrosia+0.38411XPteris+2.77741XSelaginella+*** had reconstructed annual mean temperature series by use of the sporo-pollen samples concentra-tion percentage in peat section with 297 cm thickness in Dajiuhu since 15.753 *** temperature series reflect well the character of climatic change since the late glacial,which indicates extreme cold climate event of the Oldest Dryas,the Older Dryas,the Younger Dryas and the 8.2 kaBP,the same to the climate fluctuations of Bolling Warm Period and Allerod Warm Period,and the character of temperature change fluctuating frequently at the transition age from the late glacial to the *** reconstructed temperature also indicate Holocene Optimum,late Holocene warm-dry climate,and the character of climatic change in Dajiuhu in the last 1 *** conclusion is that the sporo-pollen samples have important climatic significance to surface sediment and the section of Dajiuhu,Shennongjia and important reference value to studying climatic change during the last glaciation by the temperature transfer function and reconstructed temperature series.

关键词： Dajiuhu Shennongjia Central china spore-pollen climate factor transfer function

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生物可降解塑料的环境行为及毒性效应

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海洋环境科学 2024年第2期43卷 186-200页

作者：王加珍许婷婷程昊东徐亘博於伟琼郑春苗徐向荣裘文慧南方科技大学环境科学与工程学院广东省土壤与地下水污染防控及修复重点实验室广东深圳518055 中国科学院南海海洋研究所热带海洋生物资源与生态重点实验室广东广州510301 宁波高等研究院宁波东方理工大学(暂名) 浙江宁波315410 南丹麦大学生物系欧登塞5230 中国科学院南海海洋研究所海洋环境工程中心广东广州510301 三亚海洋生态环境工程研究院海南三亚572000

由于不合理的管控,塑料污染成为环境污染的重要问题,人们对新型、绿色的生物可降解塑料的需求与日俱增。然而,研究表明,生物可降解塑料对生态环境和人体健康同样具有负面影响。本文梳理了2000-2023年的近万篇文献,综述了生物可降解塑料... 详细信息

由于不合理的管控,塑料污染成为环境污染的重要问题,人们对新型、绿色的生物可降解塑料的需求与日俱增。然而,研究表明,生物可降解塑料对生态环境和人体健康同样具有负面影响。本文梳理了2000-2023年的近万篇文献,综述了生物可降解塑料的应用、发展历程、种类、污染现状、环境行为以及毒性效应,并对今后生物可降解塑料的研究方向提出展望,旨在促进生物可降解塑料的生态和健康风险评估,并为其合理使用和有效监管提供参考。

关键词：生物可降解塑料老化降解毒性效应传统塑料

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Vertical distribution and temporal evolution of formaldehyde and glyoxal derived from MAX-DOAS observations:The indicative role of VOC sources

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Journal of environmental sciences 2022年第12期34卷 92-104页

作者： Qianqian Hong cheng Liu Qihou Hu Yanli Zhang chengzhi Xing Jinping Ou Wei Tan Haoran Liu Xiaoqing Huang Zhenfeng Wu School of environment and Civil Engineering Jiangnan UniversityWuxi 214122China center for Excellence in Regional Atmospheric environment Institute of Urban EnvironmentChinese Academy of SciencesXiamen 361021China Key Lab of environmental Optics&technology Anhui Institute of Optics and Fine MechanicsHefei Institutes of Physical ScienceChinese Academy of SciencesHefei 230031China department of Precision Machinery and Precision Instrumentation University of Science and Technology of ChinaHefei 230026China Anhui Province Key Laboratory of Polar environment and Global Change University of Science and Technology of ChinaHefei 230026China Guangdong Key Laboratory of environmental Protection and Resources Utilization State Key Laboratory of Organic GeochemistryGuangzhou Institute of GeochemistryChinese Academy of SciencesGuangzhou 510640China Guangdong-Hongkong-Macao Joint Laboratory of Collaborative Innovation for environmental Quality Guangzhou 510632China Institute of Physical Science and Information technology Anhui UniversityHefei 230601China

Formaldehyde(HCHO)and glyoxal(CHOCHO)are important oxidization intermediates of most volatile organic compounds(VOCs),but their vertical evolution in urban areas is not well *** profiles of HCHO,CHOCHO,and nitrogen dioxide(NO_(2))were retrieved from ground-based Multi-Axis Differential Optical Absorption Spectroscopy(MAXDOAS)observations in Hefei,*** and CHOCHO vertical profiles prefer to occur at higher altitudes compared to NO_(2),which might be caused by the photochemistry-oxidation of longer-lived VOCs at higher *** means of HCHO concentrations were higher in summer,while enhanced amounts of NO_(2)were mainly observed in *** exhibited a hump-like seasonal variation,with higher monthly-averaged values not only occurred in warm months(July-August)but also in cold months(November-December).Peak values mainly occurred during noon for HCHO but emerged in the morning for CHOCHO and NO_(2),suggesting that HCHO is stronger link to photochemistry than *** further use the glyoxal to formaldehyde ratio(GFR)to investigate the VOC sources at different *** lowest GFR value is almost found in the altitude from 0.2 to 0.4 km,and then rises rapidly as the altitude *** GFR results indicate that the largest contributor of the precursor VOC is biogenic VOCs at lower altitudes,while at higher altitudes is anthropogenic *** findings provide a lot more insight into VOC sources at vertical direction,but more verification is recommended to be done in the future.

关键词： Formaldehyde Glyoxal MAX-DOAS Vertical distribution VOC

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A Visual Analytics Framework for ocean Scalar Volume Data

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ocean-Land-Atmosphere research 2023年第1期2卷 173-189页

作者： Jinyu Li Tianyi Huang Ping Hu Weicheng Cui Shenghui cheng research center for Industries of the Future and School of Engineering Westlake UniversityHangzhouChina department of Computer Science Stony Brook UniversityStony BrookNYUSA. Key Laboratory of Coastal of environment and Resources of Zhejiang Province School of EngineeringWestlake UniversityHangzhouChina

The processes and phenomena hidden in massive marine data importantly impact heat transportation,material transportation,and climate *** can assist people in mining and understanding marine data to gain ***,oceanographers must study ocean processes and ***,one remaining challenge in the existing visualization methods is efficiently rendering marine data with large volumes and illustrating the internal structure of marine *** solve this problem,we propose a new visual analytics framework involving 4 parts for visualizing extensive marine scalar volume *** first use a single box and double spheres separately as proxy geometries to draw a flat earth and spherical ***,we design a new ray-casting algorithm based on graphics processing unit to reduce the volume of marine *** algorithm accelerates volume rendering by using an adaptive texture sampling rate and step ***,we use a depth correction algorithm to accurately restore the ocean ***,we develop an internal roaming algorithm to observe the internal structure of marine *** this way,users can dynamically observe the internal structure of marine *** illustrate the effectiveness of our algorithms,we use them to visualize Hybrid Coordinate ocean Model data and Argo data.

关键词： Visual graphics rendering

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Early Paleozoic geodynamic evolution of the Eastern Central Asian Orogenic Belt: Insights from granitoids in the Xing’an and Songnen blocks

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Geoscience Frontiers 2020年第6期11卷 1975-1992页

作者： Xin-Lu Hu Shu-Zhen Yao cheng-Yin Tan Guo-Ping Zeng Zhen-Ju Ding Mou-Chun He Faculty of earth Resources China University of GeosciencesWuhan430074China National Demonstration center for Experimental Mineral Exploration Education China University of GeosciencesWuhan430074China Heilongjiang Mining Group Limited Liability Company Harbin150036China Wuhan center China Geological SurveyWuhan430205China

The early Paleozoic tectonic framework and evolutionary history of the eastern Central Asian Orogenic Belt(CAOB)is poorly *** we present zircon U-Pb geochronology,whole rock geochemistry,and Sr-NdHf isotope data of the early Paleozoic granitoids in eastern CAOB to investigate the petrogenesis and geodynamic *** early Paleozoic granitoids from the Songnen Block yield zircon U-Pb ages of 523-490 Ma,negative εNd(t)values of-6.7 to-0.8,and values of-8.6 to 7.1,indicating they were generated by partial melting of ancient crustal materials with various degrees of mantle *** generally show affinities to A-type granites,implying their generation from an extensional environment after the collision between the Songnen and Jiamusi *** comparison,the early Paleozoic granitoids from the Xing’an Block have zircon U-Pb ages of 480-465 Ma,εNd(t)values of-5.4 to 5.4,andεHf(t)values of-2.2 to 12.9,indicating a dominated juvenile crustal source with some input of ancient crustal *** belong to I-type granites and were likely related to subduction of the Paleo-Asian *** statistics of TDM2 Hf model ages of the granitoids indicate that the Erguna and Jiamusi blocks contain a significant proportion of Mesoproterozoic crystalline basement,while the Xing’an Block is dominated by a Neoproterozoic *** on these observations,the early Paleozoic evolutionary history of eastern GAOB can be divided into four stages:(1)before 540 Ma,the Erguna,Xing’an,Songnen,and Jiamusi blocks were discrete microcontinents separated by different branches of the Paleo-Asian ocean;(2)540-523 Ma,the Jiamusi Block collided with the Songnen Block along the Mudanjiang suture;(3)ca.500 Ma,the Erguna Block accreted onto the Xing’an Block along the Xinlin-Xiguitu suture;(4)ca.480 Ma,the Paleo-Asian ocean started a double-side subduction beneath the united Erguna-Xing’an and Songnen-Jiamusi blocks.

关键词： Early Paleozoic U–Pb geochronology Sr-Nd-Hf isotopes NE china Central Asian Orogenic Belt

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