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Assessing 10 Satellite Precipitation Products in Capturing the July 2021 Extreme Heavy Rain in Henan, China

Journal of Meteorological Research 2022年第5期36卷 798-808页

作者： Songnan LIU Jun wang huijun wang Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters Nanjing University of Information Science&TechnologyNanjing 210044 Nansen-Zhu International Research Centre Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029

On 20 July 2021,a sudden rainstorm happened in central and northern Henan Province,China,killing at least 302people.This extreme precipitation event incurred substantial socioeconomic impacts and resulted in serious losses.Accurate monitoring of such rainstorm events is crucial.In this study,qualitative and quantitative methods are used to comprehensively evaluate the abilities of 10 high-resolution satellite precipitation products[CMORPH-Raw(Climate Prediction Center morphing technique),CMORPH-RT,PERSIANN-CCS(Precipitation Estimation from Remotely Sensed Information Using Artificial Neural Networks),GPM IMERG-Early(Integrated Multisatellite Retrievals for Global Precipitation Measurement),GPM IMERG-Late,GSMaP-Now(Global Satellite Mapping of Precipitation),GSMaP-NRT,FY-2F,FY-2G,and FY-2H]in capturing this extreme rainstorm event,as well as their performances in monitoring different precipitation intensities.The results show that these satellite precipitation products are able to capture the spatial distributions of the rainstorm(e.g.,its location in central and northern Henan),but all products have underestimated the amount of precipitation in the rainstorm center.With the increase in precipitation intensity,the hit rate decreases,the threat score decreases,and the false alarm rate increases.CMORPH-RT is better at capturing the rainstorm than CMORPH-Raw,and it depictes the rainstorm process well;GPM IMERG-Late is more accurate than GPM IMERG-Early;GSMaP-NRT has performed better than GSMaP-Now;and PERSIANNCCS and FY-2F perform poorly.Among the products,CMORPH-RT performs the best,which has accurately captured the center of the rainstorm,and is also the closest to the station-based observations.In general,the satellite precipitation products that integrate infrared and passive microwave data are found to be better than those that only make use of infrared data.The satellite precipitation retrieval algorithm and the amount of passive microwave data have a relatively greater impact on the accuracy of satellite precip

关键词： heavy rain CMORPH(Climate Prediction Center morphing technique) FY(Fengyun) GPM(Global Precipitation Measurement)

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基于11月初乌拉尔山积雪展开的中国南方冬季降水的次季节预测研究

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Atmospheric and Oceanic Science Letters 2020年第6期13卷 534-541页

作者： LI Jingyi LI Fei WANG HuiJun Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters/Key Laboratory of Meteorological Disaster Ministry of EducationNanjing University of Information Science&TechnologyNanjingChina Geophysical Institute University of Bergen and Bjerknes Centre for Climate ResearchBergenNorway Climate Change Research Center Chinese Academy of SciencesBeijingChina dNansen-Zhu International Research Center Institute of Atmospheric PhysicsChinese Academy of SciencesBeijingChina

众多研究表明,秋季积雪的时空演变是次季节尺度气温预测的重要依据,然而其与降水变化的关系还未得到充分研究。本文分析发现,在1979/80至2016/17时期,11月前期(1至14日)乌拉尔山地区雪水当量与该年11月15至21日及次年1月6至15日中国南... 详细信息

众多研究表明,秋季积雪的时空演变是次季节尺度气温预测的重要依据,然而其与降水变化的关系还未得到充分研究。本文分析发现,在1979/80至2016/17时期,11月前期(1至14日)乌拉尔山地区雪水当量与该年11月15至21日及次年1月6至15日中国南方降水有显著的正相关关系。乌拉尔山雪水当量在11月前期(1至14日)偏少时,可以通过非绝热加热过程增暖其上空大气,表现为显著的陆-气耦合。同时乌拉尔山地区出现准定常Rossby波列,并沿极锋急流向东传播。在11月中期(15至21日),该波列向下游传播至东亚地区,增强了东亚大槽强度,使得中国南方水汽输送强度减弱,降低了该地区的降水强度。在其后的11月22日至次年1月5日,乌拉尔山地区陆-气耦合较弱,其上空环流异常也较弱。在次年1月前期(6至15日),积雪向南扩展至地中海北侧地区,并通过陆-气耦合作用冷却其上方大气。气旋性环流异常出现在欧洲上空,同时伴随着沿副热带西风急流传播的准定常Rossby波列。该波列加深东亚大槽,并减弱了中国南方地区的降水强度。本文研究结果可用于中国南方冬季次季节尺度降水的预测。

关键词：欧亚积雪陆–气耦合次季节气候可预测性

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Fatigue Crack Growth Behavior of Eutectoid Steel Rail

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Journal of Wuhan University of Technology(Materials Science) 2022年第3期37卷 507-512页

作者：岑耀东陈林 JI Chunjiao WANG HuiJun BAO Xirong School of Materials and Metallurgy Inner Mongolia University of Science and TechnologyBaotou 014010China

The fatigue crack behavior of U75V rail under different quenching rates was studied using SEM and CLSM.The results show that the pearlite interlayer spacing and fatigue crack growth rate decrease,and the deflection path of cracks and the number of branching cracks of U75V rail increases with an increase of cooling rate.The tearing edge of unstable region transites from pearlite lamellae to dimple.The fatigue crack growth path is closely related to the orientation of lamellae in pearlite microstructure.There are three modes direction of fatigue crack growth path and pearlite lamellar,which are parallel,vertical and 45°angle,and most of the branch cracks occur at an angle of 45°between the lamellar direction and the crack direction.More specifically,the deflection paths of cracks and branching crack have a relaxation effect on the stress intensity at the crack tip,which restrains the fatigue crack growth rate.

关键词： fatigue fracture crack growth rail microstructure

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Potential Impact of Future Climate Change on Crop Yield in Northeastern China

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Advances in Atmospheric Sciences 2015年第7期32卷 889-897页

作者： ZHOU Mengzi WANG HuiJun Nansen-Zhu International Research Centre Institute of Atmospheric PhysicsChinese Academy of Sciences Climate Change Research Center Chinese Academy of Sciences University of Chinese Academy of Sciences

We evaluated the potential impact of future climate change on spring maize and single-crop rice in northeastern China （NEC） by employing climate and crop models. Based on historical data, diurnal temperature change exhibited a distinct negative relationship with maize yield, whereas minimum temperature correlated positively to rice yield. Corresponding to the evaluated climate change derived from coupled climate models included in the Coupled Model Intercomparison Project Phase 5 （CMIP5） under the Representative Concentration Pathway 4.5 scenario （RCP4.5）, the projected maize yield changes for three future periods [2010-39 （period 1）, 2040-69 （period 2）, and 2070-99 （period 3）] relative to the mean yield in the baseline period （1976-2005） were 2.92%, 3.11% and 2.63%, respectively. By contrast, the evaluated rice yields showed slightly larger increases of 7.19%, 12.39%, and 14.83%, respectively. The uncertainties in the crop response are discussed by considering the uncertainties obtained from both the climate and the crop models. The range of impact of the uncertainty became markedly wider when integrating these two sources of uncertainty. The probabilistic assessments of the evaluated change showed maize yield to be relatively stable from period 1 to period 3, while the rice yield showed an increasing trend over time. The results presented in this paper suggest a tendency of the yields of maize and rice in NEC to increase （but with great uncertainty） against the background of global warming, which may offer some valuable guidance to government policymakers.

关键词： northeastern China statistical crop models climate models projection uncertainty

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State Machine with Tracking Tree and Traffic Allocation Scheme Based on Cumulative Entropy for Satellite Network

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Chinese Journal of Electronics 2020年第1期29卷 183-189页

作者： LIN Wenliang WANG HuiJun DENG Zhongliang wang Ke ZHOU Xiaotian The School of Electronic Engineering Beijing University of Posts and Telecommunications Science and Technology on Communication Networks Laboratory 54th Institute CETC Chinese Institute of Electronics

Satellite network is regarded as an important component of 5 th Generation(5 G). New deployment scenarios have been designed in form of satellite network fused 5 G terrestrial network. Service requests in Non terrestrial networks(NTN) are noncentralized in the time and space domain, which cause services modelling uncertain and lack of balance between latency and bandwidth. Targeted at those bottlenecks,a Satellite service model based on State machine with tracking tree(SM-SMTT) and traffic allocation scheme base on cumulative entropy is proposed. Enhanced mobile broadband service, low latency service and massive machine type communications in satellite will be modelled by SM-SMTT. Cumulative entropy is introduced as the criterion to allocate traffic. According to the lower bound from cumulative entropy, the balance of latency and bandwidth is achieved in different deployment scenarios.The simulation in OPNET, demonstrations the new scheme has promoted the performance of delay and bandwidth utilization by 37.8% and 12.0%.

关键词： Heterogeneous network Traffic congestion Channel utilization OPNET

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Why super sandstorm 2021 in North China?

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National Science Review 2022年第3期9卷 119-127页

作者： Zhicong Yin Yu Wan Yijia Zhang huijun wang Key Laboratory of Meteorological Disaster Ministry of EducationJoint International Research Laboratory of Climate and Environment Change(ILCEC)/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters (CIC-FEMD)Nanjing University of Information Science and Technology Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai) Nansen-Zhu International Research Centre Institute of Atmospheric PhysicsChinese Academy of Sciences

Severe sandstorms reoccurred in the spring of 2021 after an absence for more than 10 years in North China.The dust source area,located in Mongolia,suffered destructive cooling and warming in early and late winter,which loosened the land.A lack of precipitation,excessive snow melt and strong evaporation resulted in dry soil and exiguous spring vegetation.A super-strong Mongolian cyclone developed on the bare and loose ground,and easily blew and transported large amounts of sand particles into North China.Furthermore,top-ranking anomalies(sea ice shift in the Barents and Kara Sea,and sea surface temperatures in the east Pacific and northwest Atlantic) were found to induce the aforementioned tremendous climate anomalies in the dust source area.Analys es,based on large-ensemble Coupled Model Intercomparison Project Phase 6,yield results identical to the reanalysis data.Thus,the climate variabilities at different latitudes and synoptic disturbances jointly facilitated the strongest spring sandstorm over the last decade.

关键词： sandstorm dust source Arctic sea ice La Niña cyclone

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The impact of external search, tie strength, and absorptive capacity on new product development performance

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中国科学技术大学学报 2023年

作者： huijun Yang Wei wang School of Economics and Management Chang’an University

This study examines the influences of external search breadth and depth on new product development performance from a knowledge-based view. In particular, we introduce tie strength and absorptive capacity as two contextual variables in this study. The findings from data on 281 Chinese firms indicate that search breadth facilitates new product creativity, whereas search depth facilitates development speed. Tie strength weakens the relationships between search breadth and new product creativity but strengthens the relationship between search depth and development speed. Furthermore, the synergistic effect of tie strength and absorptive capacity negatively moderates the relationship between search breadth and new product creativity but positively moderates the relationship between search depth and development speed.

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Meteorological influences on co-occurrence of O_(3) and PM_(2.5)pollution and implication for emission reductions in Beijing-Tianjin-Hebei

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Science China Earth Sciences 2023年第6期66卷 1258-1267页

作者： Xiaoqing MA Zhicong YIN Bufan CAO huijun wang Key Laboratory of Meteorological Disaster Ministry of Education/Joint International Research Laboratory of Climate and Environment Change(ILCEC)/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters(CIC-FEMD)Nanjing University of Information Science&TechnologyNanjing 210044China Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai) Zhuhai 519080China Nansen-Zhu International Research Centre Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China

Co-occurrence of surface ozone(O_(3))and fine particulate matter(PM_(2.5))pollution(CP)was frequently observed in Beijing-Tianjin-Hebei(BTH).More than 50%of CP days occurred during April-May in BTH,and the CP days reached up to 11 in two months of 2018.The PM_(2.5)or O_(3) concentration associated with CP was lower than but close to that in O_(3) and PM_(2.5)pollution,indicating compound harms during CP days with double-high concentrations of PM_(2.5)and O_(3).CP days were significantly facilitated by joint effects of the Rossby wave train that consisted of two centers associated with the Scandinavia pattern and one center over North China as well as a hot,wet,and stagnant environmental condition in BTH.After 2018,the number of CP days decreased sharply while the meteorological conditions did not change significantly.Therefore,changes in meteorological conditions did not really contribute to the decline of CP days in 2019 and 2020.This implies that the reduction of PM_(2.5)emission has resulted in a reduction of CP days(about 11 days in 2019 and 2020).The differences in atmospheric conditions revealed here were helpful to forecast the types of air pollution on a daily to weekly time scale.The reduction in PM_(2.5)emission was the main driving factor behind the absence of CP days in 2020,but the control of surface O_(3) must be stricter and deeper.

关键词： Co-occurrence pollution Ozone PM_(2.5) Meteorology Emission reduction

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Record-breaking summer-autumn drought in southern China in 2022:Roles of tropical sea surface temperature and Eurasian warming

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Science China Earth Sciences 2024年第2期67卷 420-431页

作者： Yuepeng HU Botao ZHOU huijun wang Dapeng ZHANG Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters/Key Laboratory of Meteorological Disaster Ministry of Education/Joint International Research Laboratory of Climate and Environment ChangeNanjing University of Information Science and TechnologyNanjing210044China School of Atmospheric Sciences Nanjing University of Information Science and TechnologyNanjing210044China

From summer to autumn in 2022,a severe drought lasted in southern China,posing serious effects on economic growth and ecological systems.This study explored the atmospheric circulations accounting for this persistent drought event.It shows that the drought in southern China during the summer of 2022 was strongly linked to the divergence of water vapor flux and descending motions,which were respectively caused by the anomalous anticyclone over the western North Pacific and the northward movement of the East Asian subtropical jet(EASJ).Differently,the atmospheric background responsible for the sustained drought in autumn is manly featured by a cyclonic circulation anomaly over the region from the Bay of Bengal to the South China Sea,which led to decreased moisture and descending motions in southern China.Further investigation suggests that the rarely strong surface warming over northern Eurasia and the extreme La Nina-like pattern over the tropical Pacific jointly resulted in the anomalous anticyclone over the western North Pacific and the northward shift of the EASJ in the summer of 2022,while the cyclonic circulation anomaly prevailing over the region from the Bay of Bengal to the South China Sea in autumn was largely attributed to the extremely negative anomalies of the tropical Indian Ocean sea surface temperature.

关键词： Summer-autumn drought Southern China Tropical sea surface temperature Eurasian warming

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The increase of snowfall in Northeast China after the mid-1980s

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Chinese Science Bulletin 2013年第12期58卷 1350-1354页

作者： WANG HuiJun ShengPing Nansen-Zhu International Research Center Institute of Atmospheric Physics Chinese Academy of Sciences Climate Change Research Center Chinese Academy of Sciences Graduate University of Chinese Academy of Sciences

We studied long-term variation of winter snowfall in Northeast China (NEC) for 1951-2010. Results show that NEC snowfall increased about 20% during 1986-2010 relative to 1951-1985. Further investigation suggests that the snowfall increase is closely associated with weakening of the East Asian winter monsoon (EAWM). The physical processes were portrayed by this research. Weakening of EAWM led to weakened cold air flow from the north, thus resulted in the warming of the surface ocean along the Northeast Asia coast and more water vapor evaporated from the ocean surface to the atmosphere and further transported to NEC. Also, because of EAWM weakening, more water vapor from south, east and west of NEC was transported to NEC, increasing water vapor content and hence snowfall there. From an atmospheric circulation viewpoint, EAWM weakening strengthened convergence at low levels and divergence at high levels, thereby favoring increased vertical convection and snowfall.

关键词：中国东北地区降雪东亚冬季风中期年代海洋表面水汽含量大气环流

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