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Climatic characteristics of high temperature in East China during 1961-2005

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Journal of Geographical Sciences 2008年第3期18卷 283-294页

作者： SHI Jun TANG Xu CUI Linli Shanghai Climate center Shanghai Meteorological Bureau Shanghai 200030 China Shanghai Meteorological Bureau Shanghai 200030 China Shanghai center for satellite remote sensing and Application Shanghai Meteorological Bureau shanghai 201100 China

Based on the daily maximum temperature data covering the period 1961-2005, temporal and spatial characteristics and their changing in mean annual and monthly high temperature days（HTDs）and the mean daily maximum temperature（MDMT）during annual and monthly HTDs in East China were *** results show that the mean annual HTDs were 15.1 and the MDMT during annual HTDs was 36.3℃in the past 45 *** the mean annual HTDs and the MDMT during annual HTDs were negative anomaly in the1980s and positive anomaly in the other periods of time,oscillating with a cycle of about 12-15 *** mean annual HTDs were more in the southern part,but less in the northern part of East *** MDMT during annual HTDs was higher in Zhejiang,Anhui and Jiangxi provinces in the central and western parts of East *** high temperature process（HTP） was more in the southwestern part,but less in northeastern part of East *** the HTDs and the numbers of HTP were at most in July,and the MDMT during monthly HTDs was also the highest in *** the first 5 years of the 21st century,the mean annual HTDs and the MDMT during annual HTDs increased at most of the stations,both the mean monthly HTDs and the MDMT during monthly HTDs were positive anomalies from April to October,the number of each type of HTP generally was at most and the MDMT in each type of HTP was also the highest.

关键词： climatic characteristics high temperature days (HTDs) mean daily maximum temperature (MDMT) during HTDs high temperature process (HTP) East China

DIAGNOSIS OF TYPHOON SPIRAL CLOUD BAND AT SEA WITH SSM/I IMAGE

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Acta meteorologica Sinica 2003年第3期17卷 350-363页

作者：游然许健民张文建 Nanjing Institute of meteorology National satellite Meteorological center

This paper describes the characteristics of the Special Sensor Microwave/Imager (SSM/I) onboard the Defense Meteorological satellite Program (DMSP),analyzes absorbing,re-emitting and scattering effects of the atmospheric particles (especially cloud particles and rain drops).The inner physical cause of typhoon's representative form on microwave images is *** index of particle size is then induced as such:Symmetrically inverse channel 85H's (85H is an abbreviation for channel 85.5 GHz in horizontal polarization,see Table 1 in the text.) absorption segment and put it into the extension of the scattering *** precipitation index was formed as the average of three elements:normalized 19H,normalized 37H,and inversed normalized *** is approved that the image of particle size index overcomes some shortcomings of the single raw channel,such as:37H is not sensitive to large rain drops,85H is not sensitive to mid-size rain drops and can reveal typhoon's spiral structure more clearly.

关键词： SSM/I (Special Sensor Microwave/Imager) microwave remote sensing typhoon spiral cloud band

Data augmentation for bias correction in mapping PM_(2.5) based on satellite retrievals and ground observations

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Geoscience Frontiers 2024年第1期15卷 17-28页

作者： Tan Mi Die Tang Jianbo Fu Wen Zeng Michael L.Grieneisen Zihang Zhou Fengju Jia Fumo Yang Yu Zhan College of Carbon Neutrality Future Technology Sichuan UniversityChengduSichuan 610065China Department of Environmental Science and Engineering Sichuan UniversityChengduSichuan 610065China Institute for Disaster Management and Reconstruction Sichuan UniversityChengduSichuan 610200China Department of Land Airand Water ResourcesUniversity of CaliforniaDavisCA 95616United States Chengdu Academy of Environmental Sciences ChengduSichuan 610072China Sichuan Chengdu ecological and Environment Monitoring center ChengduSichuan 610011China

As most air quality monitoring sites are in urban areas worldwide,machine learning models may produce substantial estimation bias in rural areas when deriving spatiotemporal distributions of air *** bias stems from the issue of dataset shift,as the density distributions of predictor variables differ greatly between urban and rural *** propose a data-augmentation approach based on the multiple imputation by chained equations(MICE-DA)to remedy the dataset shift *** with the benchmark models,MICE-DA exhibits superior predictive performance in deriving the spatiotemporal distributions of hourly PM2.5 in the megacity(Chengdu)at the foot of the Tibetan Plateau,especially for correcting the estimation bias,with the mean bias decreasing from-3.4µg/m3 to-1.6µg/*** a complement to the holdout validation,the semi-variance results show that MICE-DA decently preserves the spatial autocorrelation pattern of PM2.5 over the study *** essence of MICE-DA is strengthening the correlation between PM2.5 and aerosol optical depth(AOD)during the data ***,the importance of AOD is largely enhanced for predicting PM2.5,and the summed relative importance value of the two satellite-retrieved AOD variables increases from 5.5%to 18.4%.This study resolved the puzzle that AOD exhibited relatively lower importance in local or regional *** results of this study can advance the utilization of satellite remote sensing in modeling air quality while drawing more attention to the common dataset shift problem in data-driven environmental research.

关键词： Aerosol optical depth Dataset shift Spatiotemporal Distribution Air quality monitoring Multiple imputation by chained equations

Major Scientific Achievements of the First China–Japan Cooperative GAME/HUBEX Experiment: A Historical Review

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Journal of Meteorological Research 2020年第4期34卷 659-674页

作者： Yihui DING Wen HU Yong HUANG Fengjiao CHEN National Climate center China Meteorological AdministrationBeijing 100081 Key Laboratory of Atmospheric Sciences and satellite remote sensing of Anhui Province Anhui Meteorological BureauHefei 230031 Shouxian National Climatology Observatory Huaihe River Basin Typical Agro-Ecosystems Meteorology Field Experiment Station of China Meteorological AdministrationShouxian 232200

In the summers of 1998 and 1999, Chinese and Japanese scientists cooperatively conducted the first large-scale energy and water cycle experiment(WCRP/GEWEX/GAME/HUBEX: World Climate Research Program/Global Energy and Water Cycle Experiment/Asian Monsoon Experiment/Huaihe River Basin Energy and Water Cycle Experiment) in the Huaihe River basin, Anhui Province of China. The main objective of this field experiment(HUBEX)was to investigate the multiple-scale structure characteristics, life cycles, and genesis and development mechanisms of the Meiyu system in East Asia as well as the cause of related flooding disasters. It was a joint China-Japan cooperative meteorological and hydrological observation experiment. On the basis of intensive observations, scientists from the two countries conducted follow-up investigations through collating and compiling data and performing scientific analysis during the following five years. It can be concluded that the HUBEX project has yielded comprehensive and remarkable achievements. This paper introduces the major scientific results derived from this field experiment and the ensuing investigations, and reassesses their merits and shortages for the purpose of providing useful experience and proposing new research targets as well as prospects for the initiation of a new joint scientific Meiyu experiment in the middle and lower Yangtze River basin.

关键词： Meiyu Huaihe River basin energy and water cycle meteorological and hydrological observations Huaihe River Basin Energy and Water Cycle Experiment(HUBEX)/Global Energy and Water Cycle Experiment(GEWEX)/Asian Monsoon Experiment(GAME)

3D Model Construction and ecological Environment Investigation on a Regional Scale Using UAV remote sensing

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Intelligent Automation & Soft Computing 2023年第8期37卷 1655-1672页

作者： Chao Chen Yankun Chen Haohai Jin Li Chen Zhisong Liu Haozhe Sun Junchi Hong Haonan Wang Shiyu Fang Xin Zhang School of Geography Science and Geomatics Engineering Suzhou University of Science and TechnologySuzhou215009China State Key Laboratory of remote sensing Science Aerospace Information Research InstituteChinese Academy of ScienceBeijing100101China School of Information Engineering Zhejiang Ocean UniversityZhoushan316022China Marine Science and Technology College Zhejiang Ocean UniversityZhoushan316022China China Aero Geophysical and remote sensing center for Natural Resources Beijing100083China

The acquisition of digital regional-scale information and ecological environmental data has high requirements for structural texture,spatial res-olution,and multiple parameter categories,which is challenging to achieve using satellite remote *** the convenient,facilitative,and flexible characteristics of UAV(unmanned air vehicle)remote sensing tech-nology,this study selects a campus as a typical research area and uses the Pegasus D2000 equipped with a D-MSPC2000 multi-spectral camera and a CAM3000 aerial camera to acquire oblique images and multi-spectral *** professional software,including Context Capture,ENVI,and ArcGIS,a 3D(three-dimensional)campus model,a digital orthophoto map,and multi-spectral remote sensing map drawing are realized,and the geometric accuracy of typical feature selection is *** on a quantitative remote sensing model,the campus ecological environment assessment is performed from the perspectives of vegetation and water *** results presented in this study could be of great significance to the scientific management and sustainable development of regional natural resources.

关键词： Unmanned air vehicle multi-spectral camera oblique photography 3D model construction ecological environment investigation regional scale

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Journal of Ocean University of China 2023年第2期22卷 490-500页

作者： YU Wei FENG Zhiping CHEN Bingjian WEI Zhenhua FENG Yinyin Shandong Marine Resources and Environment Research Institute Yantai 264006China College of Marine Sciences Shanghai Ocean UniversityShanghai 201306China National Ocean satellite Shandong Data Application center Yantai 264006China Shandong Provincial Key Laboratory of Marine ecological Restoration Yantai 264006China

The Japanese common squid Todarodes pacificus is widely distributed in the Sea of Japan,the East China Sea and the Northwest Pacific Ocean,and is largely exploited by the Asia-Pacific *** this study,the impacts of regime shift of the Pacific Decadal Oscillation(PDO)during 1977-2015 on the autumn cohort of *** were assessed by examining the variations in vertical water temperatures at depths of 0 m(Temp_0 m),50 m(Temp_50 m)and 100 m(Temp_100 m)and the distribution pattern of preferred spawning ground(SSG).Spatial and temporal correlation analysis revealed that the PDO index exhibited a significantly negative relationship with vertical water temperatures at different depths and was negatively related to catch-per-unit-effort(CPUE)and stock biomass of *** addition,water temperatures in the specific three water layers were positively associated with *** PDO regime shift strongly affected the thermal condition and spawning ground of *** to the negative PDO,the waters from the surface to the deep became cool in the positive PDO phase;correspondingly,the area of SSG largely contracted at different ***,the CPUE and stock biomass of *** profoundly *** the results it can be concluded that the PDO regime shift-driven changes in vertical thermal condition and SSG ranges can yield substantial impacts on *** abundance.

关键词： Todarodes pacificus vertical water temperature spawning ground Pacific Decadal Oscillation regime shift

Risk assessment of maize drought disaster in southwest China using the Environmental Policy Integrated Climate model

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Journal of Mountain Science 2016年第3期13卷 465-475页

作者： JIA Hui-cong PAN Dong-hua LI Jing ZHANG Wan-chang Ghulam RASUL State Key Laboratory of remote sensing Science Institute of Remote Sensing and Digital Earth Chinese Academy of Sciences Beijing 100094 China National Disaster Reduction center of China Ministry of Civil Affairs of the People's Republic of China Beijing 100124 China satellite Environment center Ministry of Environmental Protection Beijing 100094 China Pakistan Meteorological Department Islamabad 44000 Pakistan

The East Asian monsoon has a tremendous impact on agricultural production in China. An assessment of the risk of drought disaster in maize-producing regions is therefore important in ensuring a reduction in such disasters and an increase in food security. A risk assessment model, EPIC(Environmental Policy Integrated Climate) model, for maize drought disasters based on the Erosion Productivity Impact Calculator crop model is proposed for areas with the topographic characteristics of the mountainous karst region in southwest China. This region has one of the highest levels of environmental degradation in China. The results showed that the hazard risk level for the maize zone of southwest China is generally high. Most hazard index values were between 0.4 and 0.5,accounting for 47.32% of total study area. However,the risk level for drought loss was low. Most of the loss rate was <0.1, accounting for 96.24% of the total study area. The three high-risk areas were mainlydistributed in the parallel ridge–valley areas in the east of Sichuan Province, the West Mountain area of Guizhou Province, and the south of Yunnan *** results provide a scientific basis and support for the reduction of agricultural drought disasters and an increase in food security in the southwest China maize zone.

关键词：干旱灾害西南地区气候模型风险评价环境政策玉米风险评估模型风险水平

A model for accurately calculating hyper-spectral, middle-shortwave infrared radiative transfer for remote sensing

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Science China Earth Sciences 2018年第3期61卷 317-326页

作者： BAI WenGuang ZHANG Peng ZHANG WenJian MA Gang QI ChengLi School of Atmosphere Physics Nanjing University of Information Science & Technology Nanjing 210044 China National satellite meteorology center Beijing 100081 China

Although the calculation of radiative transfer in the middle-shortwave infrared band is important in the field of optical remote sensing, studies in this area of research are rare in China. Both solar reflection and atmospheric emission should be considered when calculating radiative transfer in the middle-shortwave infrared band. This paper presents a new radiative transfer model based on the doubling and adding method. The new model uses approximate calculations of direct solar reflection,multiple scattering, and thermal emissions for a finitely thin atmospheric layer and considers both the solar and thermal sources of radiation. To verify its accuracy, the calculation results produced by the model for four typical scenarios(single layer at night,multi-layer aerosols, double-layer with ice and water clouds, and multi-layer with clouds and aerosols) were compared with those of the DISORT model. With the exception of a few channels, the absolute deviation between the two models was less than2×10^(-6) K. For the same calculation, the computation speed of the new model was approximately two to three times faster than that of the DISORT model. Sensitivity studies were performed to evaluate the error resulting from using simplified calculation methods in the new model. The results obtained in this study indicated that atmospheric thermal emission made a significant contribution to the measured radiance in the strong-absorption band(2230–2400 cm^(-1)), whereas solar radiation could be neglected in this region. However, neglecting solar radiation in the window region(2400–2580 cm^(-1)) introduced error on the order of dozens of K. Employing the average-layer temperature method simplified the calculation of thermal radiation but caused a larger error in the strong-absorption band than in the window region. In the doubling and adding method, the calculation error decreased as the value used for minimum optical thickness decreased. Under the condition of satisfying the requi

关键词：计算模型近似计算放射能红外线短波遥感简化计算方法计算结果

The Warming and Wetting ecological Environment Changes over the Qinghai-Tibetan Plateau and the Driving Effect of the Asian Summer Monsoon

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Journal of Tropical meteorology 2022年第1期28卷 95-108页

作者：孙婵徐祥德王培娟杨典张胜军王春竹蔡雯悦 Nanjing University of Information Science and Technology Nanjing 210044 China State Key Laboratory of Severe Weather Chinese Academy of Meteorological SciencesBeijing 100081 China National satellite Ocean Application Service Ministry of Natural ResourcesBeijing 100081 China Key Laboratory of Space Ocean remote sensing and Application Ministry of Natural ResourcesBeijing 100081 China Training center China Meteorological AdministrationBeijing 100081 China National Climate center China Meteorological AdministrationBeijing 100081 China

The impact of warming and wetting on the ecological environment of the Qinghai-Tibet Plateau(TP)under the background of climate change has been a concern of the global scientific *** this paper,the optimized interpolation variational correction approach is adopted for the analysis of monthly high-resolution satellite precipitation products and observations from meteorological stations during the past 20 *** a result,the corrected precipitation products can not only supplement the“blank area”of precipitation observation stations on the TP,but also improve the accuracy of the original satellite precipitation *** precipitation over the TP shows different spatial changes in the vegetation growing season,known as the time from May to *** precipitation in the vegetation growing season and leaf area index(LAI)in the following month show a similar change pattern,indicating a“one-month lag”response of LAI to precipitation on the *** analysis illustrates the influence of water vapor transport driven by the Asian summer *** vapor derived from trans-equatorial air flows across the Indian Ocean and Arabian Sea is strengthened,leading to the increase of precipitation in the central and northern TP,where the trend of warming and wetting and the increase of vegetation tend to be more *** contrast,as a result of the weakening trend of water vapor transport in the middle and low levels in southern TP,the precipitation decreases,and the LAI shows a downtrend,which inhibits the warming and wetting ecological environment in this area.

关键词： the Qinghai-Tibetan Plateau optimized interpolation variational precipitation warming and wetting Asian Summer Monsoon

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