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Comparison of Ten Potential Evapotranspiration Models and Their Attribution Analyses for Ten Chinese Drainage Basins

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Advances in Atmospheric Sciences 2020年第9期37卷 959-974页

作者： Ruiheng XIE aihui wang School of Atmospheric Sciences Chengdu University of Information TechnologyChengdu 610225China Nansen-Zhu International Research Center Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China

Potential evapotranspiration(EPET)is usually calculated by empirical methods from surface meteorological variables,such as temperature,radiation and wind *** in-situ measured pan evaporation(ETpan)can also be used as a proxy for *** this study,EPET values computed from ten models are compared with observed ETpan data in ten Chinese river basins for the period 1961−*** daily observed meteorological variables at 2267 stations are used as the input to those models,and a ranking scheme is applied to rank the statistical quantities(ratio of standard deviations,correlation coefficient,and ratio of trends)between ETpan and modeled EPET in different river *** are large deviations between the modeled EPET and the ETpan in both the magnitude and the annual trend at most *** eight of the basins(except for Southeast and Southwest China),ETpan shows decreasing trends with magnitudes ranging between−0.01 mm d−1 yr−1 and−0.03 mm d−1 yr−1,while the decreasing trends in modeled EPET are less than−0.01 mm d−1 yr−*** comparisons among different models in different river basins suggest that PETHam1 is the best model in the Pearl River basin,PETHam2 outperforms other models in the Huaihe River,Yangtze River and Yellow River basins,and PETFAO is the best model for the remaining *** analyses reveal that wind speed and sunshine duration are two important factors for decreasing EPET in most basins except in Southeast and Southwest *** increasing EPET trend in Southeast China is mainly attributed to the reduced relative humidity.

关键词： potential evapotranspiration model pan evaporation model comparison sensitivity analysis China

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Evaluation of Routed-Runoff from Land Surface Models and Reanalyses Using Observed Streamflow in Chinese River Basins

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Journal of Meteorological Research 2020年第1期34卷 73-87页

作者： Yue MIAO aihui wang Nansen–Zhu International Research Centre Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029 University of Chinese Academy of Sciences Beijing 100049

Previous studies have demonstrated that offline land surface models(LSMs)and global hydrological models(GHMs)can reasonably reproduce streamflow in large river *** reanalyses supply fine spatiotemporal runoff estimates,but they are not fully intercompared and evaluated in *** study assesses the routed-runoff from five offline LSM/GHM runs(VIC-CN05.1,CLM-CFSR,CLM-ERAI,CLM-MERRA,and CLM-NCEP)and three reanalysis datasets(ERAI/Land,JRA55,and MERRA-2)against the gauged streamflow(26 stations)in major Chinese river basins during 1980–*** Catchment-based Macro-scale Floodplain model(CaMa-Flood)is employed to route those runoff datasets to the hydrological *** statistical quantities,including the correlation coefficient(R),standard deviation(STD),Nash–Sutcliffe efficiency coefficient(NSE),and relative error(RE),along with a ranking method,are used to quantify the quality of those *** results show that the spatial patterns of both modeled and observed streamflow in summer are similar,but their magnitudes are *** for MERRA-2,the other products can reproduce well the interannual variability of streamflow in both the Yangtze and Yellow River *** products generally underestimate the magnitude and variance of monthly streamflow,while VIC-CN05.1 and JRA55 are closer to observations compared to other *** correlation coefficients for all products are overall larger than 0.61,with the highest value(0.85)from *** addition to CLM-MERRA,MERRA-2,and CLM-NCEP with relatively small precipitation,other products can simulate peak flow well with positive NSEs up to 0.41(ERAI/Land).Considerable uncertainties exist among the eight products at the Yellow River outlet,which might be because the LSMs ignore frequent human *** on the above statistics,performances of the eight runoff products are ranked in descending order as follows:VIC-CN05.1,ERAI/Land,JRA55,CLM-CFSR,CLM-ERAI,MERRA-2,CLM-MERRA,and CLM-NCE

关键词： runoff land surface model(LSM) reanalysis data Catchment-based Macro-scale Floodplain model(CaMa-Flood) observed streamflow

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Homogenization of the Daily Land Surface Temperature over the Mainland of China from 1960 through 2017

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Advances in Atmospheric Sciences 2021年第11期38卷 1811-1822页

作者： Dan wang aihui wang Xianghui KONG Nansen-Zhu International Research Center Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China University of Chinese Academy of Sciences Beijing 100029China

Land surface temperature(LST)is one of the most important factors in the land-atmosphere interaction *** measured LSTs may contain biases due to instrument replacement,changes in recording procedures,and other non-climatic *** study attempts to reduce the above biases in raw daily measurements and achieves a homogenized daily LST dataset over China using 2360 stations from 1960 through *** high-quality land surface air temperature(LSAT)dataset is used to correct the LST warming biases especially evident during cold months in regions north of 40ºN due to the replacement of observation instruments around ***,the Multiple Analysis of Series for Homogenization(MASH)method is adopted to detect and then adjust the daily observed LST *** total,3.68×10^(3) effective breakpoints in 1.65×106 monthly records(about 20%)are detected.A large number of these effective breakpoints are located over large parts of the Sichuan Basin and southern *** the MASH procedure,LSTs at more than 80%of the breakpoints are adjusted within+/-0.5℃,and of the remaining breakpoints,only 10%are adjusted over 1.5℃.Compared to the raw LST dataset over the whole domain,the homogenization significantly reduces the mean LST magnitude and its interannual variability as well as its linear trend at most ***,we perform preliminary analysis upon the homogenized LST and find that the annual mean LST averaged across China shows a significant warming trend[0.22℃(10 yr)^(-1)].The homogenized LST dataset can be further adapted for a variety of applications(e.g.,model evaluation and extreme event characterization).

关键词： land surface temperature(LST) daily observation homogenization MASH method variability

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The Linkage between Two Types of El Ni?o Events and Summer Streamflow over the Yellow and Yangtze River Basins

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Advances in Atmospheric Sciences 2020年第2期37卷 160-172页

作者： Dan wang aihui wang Lianlian XU Xianghui KONG Nansen-Zhu International Research Center Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China University of Chinese Academy of Sciences Beijing 100029China

It is generally agreed that El Nino can be classified into East Pacific(EP)and Central Pacific(CP)***,little is known about the relationship between these two types of El Ni?o and land surface climate *** study investigates the linkage between EP/CP El Ni?o and summer streamflow over the Yellow and Yangtze River basins and their possible *** the Yellow River basin,the anomalous streamflow always manifests as positive(negative)in EP(CP)years,with a correlation coefficient of 0.39(-0.37);while over the Yangtze River basin,the anomalous streamflow shows as positive in both EP and CP years,with correlation coefficients of 0.72 and 0.48,*** of the surface hydrological cycle indicate that the streamflow is more influenced by local evapotranspiration(ET)than precipitation over the Yellow River basin,while it is dominantly affected by precipitation over the Yangtze River *** different features over these two river basins can be explained by the anomalous atmospheric circulation,which is cyclonic(anticyclonic)north(south)of 30°N over East *** years are dominated by two anticyclones,which bring strong water vapor convergence and induce more precipitation but less ET,and subsequently increase streamflow and flooding *** CP years,especially over the Yellow River basin,two cyclones dominate and lead to water vapor divergence and reduce moisture ***,the ET enhances mainly due to local high surface air temperature,which further evaporates water from the *** a result,the streamflow decreases,which will then increase the drought risk.

关键词： summer streamflow EP El Nino CP El Nino Yellow River basin Yangtze River basin

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Assessment of Temperature Extremes in China Using RegCM4 and WRF

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Advances in Atmospheric Sciences 2019年第4期36卷 363-377页

作者： Xianghui KONG aihui wang Xunqiang BI Dan wang Nansen-Zhu International Research Centre Institute of Atmospheric PhysicsChinese Academy of Sciences Climate Change Research Center Institute of Atmospheric PhysicsChinese Academy of Sciences

This study assesses the performance of temperature extremes over China in two regional climate models(RCMs),RegCM4 and WRF, driven by the ECMWF's 20 th century reanalysis. Based on the advice of the Expert Team on Climate Change Detection and Indices(ETCCDI), 12 extreme temperature indices(i.e., TXx, TXn, TNx, TNn, TX90 p, TN90 p,TX10 p, TN10 p WSDI, ID, FD, and CSDI) are derived from the simulations of two RCMs and compared with those from the daily station-based observational data for the period 1981–2010. Overall, the two RCMs demonstrate satisfactory capability in representing the spatiotemporal distribution of the extreme indices over most regions. RegCM performs better than WRF in reproducing the mean temperature extremes, especially over the Tibetan Plateau(TP). Moreover, both models capture well the decreasing trends in ID, FD, CSDI, TX10 p, and TN10 p, and the increasing trends in TXx, TXn, TNx, TNn, WSDI, TX90 p,and TN90 p, over China. Compared with observation, RegCM tends to underestimate the trends of temperature extremes,while WRF tends to overestimate them over the TP. For instance, the linear trends of TXx over the TP from observation,RegCM, and WRF are 0.53?C(10 yr)^(-1), 0.44?C(10 yr)^(-1), and 0.75?C(10 yr)^(-1), respectively. However, WRF performs better than RegCM in reproducing the interannual variability of the extreme-temperature indices. Our findings are helpful towards improving our understanding of the physical realism of RCMs in terms of different time scales, thus enabling us in future work to address the sources of model biases.

关键词： dynamical downscaling extreme-temperature index observation RegCM WRF

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Role of land-atmosphere coupling in persistent extreme climate events in eastern China in summer 2022

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Atmospheric and Oceanic Science Letters 2024年第2期17卷 19-26页

作者： Yue Chen aihui wang Nansen-Zhu International Research Centre Institute of Atmospheric PhysicsChinese Academy of SciencesBeijingChina Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters(CIC-FEMD) Nanjing University of Information Science&TechnologyNanjingChina

2022年暖季,中国东部地区遭受持续性高温,少雨和土壤干旱的复合极端事件.特征分析指出,在研究时段内,中国东部地区的气温,降水和土壤湿度呈现明显的季节内变化和南北差异。由1940-2022年的气候态可知,长江流域和东南地区的土壤含水充足... 详细信息

2022年暖季,中国东部地区遭受持续性高温,少雨和土壤干旱的复合极端事件.特征分析指出,在研究时段内,中国东部地区的气温,降水和土壤湿度呈现明显的季节内变化和南北差异。由1940-2022年的气候态可知,长江流域和东南地区的土壤含水充足,蒸散主要受限于陆面有效能量.然而,潜在机制研究指出,2022年土壤湿度对蒸散的限制作用在上述区域异常偏强,土壤湿度与气候要素之间的强反馈可能在2022年复合极端事件的演变和持续中发挥了关键作用。

关键词：复合极端事件陆气耦合土壤湿度干旱中国东部

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An overview of soil moisture drought research in China:Progress and perspective

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Atmospheric and Oceanic Science Letters 2023年第2期16卷 22-27页

作者： aihui wang Xin Ma Nansen-Zhu International Research Centre Institute of Atmospheric PhysicsChinese Academy of SciencesBeijingChina College of Earth and Planetary Sciences University of Chinese Academy of SciencesBeijingChina

论文回顾了中国土壤湿度干旱(SMD)历史重建和季节预测研究进展,并对未来研究进行了展望,自1950s年代以来,全国整体干旱频率增加,持续时间延长,且有明显区域特征.SMD预测多是利用土壤湿度与气候变量之间的统计关系,而少量基于动力学方法... 详细信息

论文回顾了中国土壤湿度干旱(SMD)历史重建和季节预测研究进展,并对未来研究进行了展望,自1950s年代以来,全国整体干旱频率增加,持续时间延长,且有明显区域特征.SMD预测多是利用土壤湿度与气候变量之间的统计关系,而少量基于动力学方法的干旱预测研究强调了初始条件和大气强迫数据对季节尺度干旱预测的重要性,本论文提出:1)加强多时间尺度,跨区域的SMD研究;2)联合气候预测系统,陆面模式和多源土壤湿度数据研制SMD预测系统。

关键词：土壤湿度干旱重建预测展望

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Resonance Scattering Effect of Dopamine Product Particle and Its Application to Polyphenoloxidase Activity Assay

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Chinese Journal of Chemistry 2011年第3期29卷 544-548页

作者： Jiang, Caina Ling, Shaoming Liang, aihui Ouyang, Huixiang wang, Pengfei Jiang, Zhiliang Key Laboratory of Ecology of Rare and Endangered Species and Environmental Protection Ministry of Education School of Environment and Resource Guangxi Normal University Guilin Guangxi 541004 China

In pH 7.2 Na2HPO4-NaH2PO4 buffer solution, polyphenoloxidase （PPO） could catalyze the oxidization of do- pamine （DA） to form polymer particles in dark-red color, which exhibited a strong resonance scattering （RS） peak at 780 nm. In the chosen conditions, as the PPO activity increased, the RS intensity at 780 nm increased linearly. The increased RS intensity （△I780nm） was linear to the PPO activity in the range of 0.10--6.0 U·mL^- 1, with a regression equation of △I780 nm = 96.6C＋ 15.1, a relative coefficient of 0.9987 and a detection limit of 0.06 U·mL^-1 PPO. The proposed method was applied to detecting PPO activity in potato sample with satisfactory results.

关键词： polyphenoloxidase dopamine organic particle resonance scattering spectral assay

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Humanoid control of lower limb exoskeleton robot based on human gait data with sliding mode neural network

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CAAI Transactions on Intelligence Technology 2022年第4期7卷 606-616页

作者： Jun Yu Shuaishuai Zhang aihui wang Wei Li Zhengxiang Ma Xuebin Yue Zhongyuan‐Petersburg Aviation College Zhongyuan University of TechnologyZhengzhouChina School of Electric and Information Engineering Zhongyuan University of TechnologyZhengzhouChina School of Intelligent Engineering Zhengzhou University of AeronauticsZhengzhouChina Department of Electronic and Computer Engineering Ritsumeikan UniversityKusatsuShigaJapan

Lower limb exoskeleton robots offer an effective treatment for patients with lower extremity *** order to improve the rehabilitation training effect based on the human motion mechanism,this paper proposes a humanoid sliding mode neural network controller based on the human gait.A humanoid model is constructed based on the human mechanism,and the parameterised gait trajectory is used as target to design the humanoid control system for *** the imprecision of the robot dynamics model,the neural network is adopted to compensate for the uncertain part of the model and improve the model ***,the sliding mode control in the system improves the response speed,tracking performance,and stability of the control *** Lyapunov stability analysis proves the stability of the control system ***,an evaluation method using the similarity function is improved based on joint angle,velocity,and acceleration to evaluate the comfort of humans in rehabilitation training more ***,to verify the effectiveness of the proposed method,simulations are carried out based on experimental *** results show that the control system could accurately track the target trajectory,of which the robot is highly similar to the human.

关键词： robot neural network

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Binuclear Ruthenium Complexes with Benzo[1,2-b;4,5-b＇]- dithiophene Analogues as Bridge Ligands： Syntheses, Characterization and Notable Difference on Electronic Coupling

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Chinese Journal of Chemistry 2017年第7期35卷 1170-1178页

作者： Ya-Ping Ou Shunlin Tang aihui wang Junhua Li Fuxing Zhang Zhifeng Xu College of Chemistry and Material Science Hengyang Normal University Key Laboratory of Functional Organo-metallic Materials of Hengyang Normal University College of Hunan ProvinceHengyangHunan 421008China

Diruthenium ethynyl complexes 1--3 （1： 1,5-dithia-s-indacene-4,8-dione; 2： 4,8-diethoxybenzo[1,2-b：4,5- b＇]dithiophene; 3： 4,8-didodecyloxybenzo[1,2-b：4,5-b＇]dithiophene） have been synthesized by incorporating the re- spective conjugated heterocyclic spacer and characterized by NMR and elemental analysis. The effects of bridge ligands＇ properties on electronic coupling between redox-active ruthenium terminal groups were investigated by electrochemistry, UV/vis/near-IR and IR spectroelectrochemistry combined with density functional theory （DFT） and time-dependent DFT calculations. Electrochemistry results indicated that complexes 1--3 exhibit two fully re- versible oxidation waves, and complexes 2 and 3 with electron-rich and π-conjuagted bridge ligands are character- ized by excellent electrochemical properties. Furthermore, the larger v（C≡C） separation from the IR spectroelec- trochemical results of 2 and 3 and the intense NIR absorption features of singly oxidized species 2＋ and 3＋ re- vealed that their molecular skeletons have superior abilities to delocalize the positive charge. The spin density dis- tribution from DFT calculations proved the conclusions of this study.

关键词： bridge ligands ruthenium terminal groups spectroelectrochemistry electronic coupling

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