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System bias correction of short-term hub-height wind forecasts using the Kalman filter

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Protection and Control of Modern Power Systems 2021年第1期6卷 473-481页

作者： Jingjing Xu Ziniu Xiao zhaohui lin Ming Li International Center for Climate and Environment Science(ICCES) Institute of Atmospheric PhysicsChinese Academy of ScienceBeijingChina State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics(LASG) Institute of Atmospheric PhysicsChinese Academy of SciencesBeijingChina Data61 Commonwealth Scientific and Industrial Research Organization(CSIRO)PerthAustralia

Wind energy is a fluctuating source for power systems, which poses challenges to grid planning for the wind power industry. To improve the short-term wind forecasts at turbine height, the bias correction approach Kalman filter (KF) is applied to 72-h wind speed forecasts from the WRF model in Zhangbei wind farm for a period over two years. The KF approach shows a remarkable ability in improving the raw forecasts by decreasing the root-mean-square error by 16% from 3.58 to 3.01 m s−1, the mean absolute error by 14% from 2.71 to 2.34 m s−1, the bias from 0.22 to − 0.19 m s−1, and improving the correlation from 0.58 to 0.66. The KF significantly reduces random errors of the model, showing the capability to deal with the forecast errors associated with physical processes which cannot be accurately handled by the numerical model. In addition, the improvement of the bias correction is larger for wind speeds sensitive to wind power generation. So the KF approach is suitable for short-term wind power prediction.

关键词： Wind forecasts Wind energy Numerical model Bias correction Kalman filter Atmospheric boundary layer

Observed trends in diurnal temperature range over Nigeria

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Atmospheric and Oceanic Science Letters 2019年第2期12卷 131-139页

作者： DIKE Victor Nnamdi lin zhaohui WANG Yuxi NNAMCHI Hyacinth International Center for Climate and Environment Sciences Institute of Atmospheric Physics Chinese Academy of Sciences College of Earth and Planetary Sciences University of Chinese Academy of Sciences Energy Climate and Environment Science Group Imo State Polytechnic Umuagwo GEOMAR Helmholtz Centre for Ocean Research Kiel

The long-term trend of diurnal temperature range(DTR)over Nigeria was examined using daily station-based datasets for the period 1971–*** results show that the regionally averaged DTR has decreased significantly(-0.34°C per decade)over the Nigerian Sahel(north of 10°N),but there has been a slight increasing trend(0.01°C per decade)over the Nigerian Guinea *** annual decreasing trend of DTR in the Nigerian Sahel is mainly attributable to the significant increasing trend in daily minimum temperature(Tmin,0.51°C per decade),which far outstrips the rate of increase in the daily maximum(Tmax,0.17°C per decade).In contrast,the comparable trends in Tmin(0.19°C per decade)and Tmax(0.20°C per decade)may explain the non-significant trend of the DTR averaged over the Guinea Coast *** is observed that the DTR has decreased more in boreal summer(June–July–August)than in boreal winter(December–January–February)for the ***,it is found that the significant DTR declining trend over the Nigerian Sahel is closely associated with an increasing trend of annual and summer precipitation in the region,but the increasing DTR trend in the Nigerian Guinea Coast region can be attributed to the decreasing trend of cloud cover over the region.

关键词： Diurnal temperature range maximum/minimum temperature trend Nigeria

Inhomogeneous trends in the onset date of extreme hot days in China over the last five decades

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Atmospheric and Oceanic Science Letters 2021年第6期14卷 33-40页

作者： Yang Yang zhaohui lin Lifeng Luo Yan Zhang Zhen Li International Center for Climate and Environment Sciences Institute of Atmospheric PhysicsChinese Academy of SciencesBeijingChina University of Chinese Academy of Sciences BeijingChina Department of Geography Environmentand Spatial SciencesMichigan State UniversityEast LansingMIUSA Key Laboratory of Regional Climate-Environment for Temperate East Asia Institute of Atmospheric PhysicsChinese Academy of SciencesBeijingChina

Using a homogenized daily maximum temperature(T_(max))dataset across China,this study characterized the spatiotemporal variation of the onset date of extreme hot days in a year(i.e.,FirstEHD)during *** trends of FirstEHD over China during 1960-2018 can be found,with the advanced trend of FirstEHD over most parts in China,while a number of stations in North-Central China(NC)show the delayed trend of ***,there exist interdecadal changes of FirstEHD trend,with a remarkable difference in the trend magnitude before and after the 1990s over South China(SC),and the sign of trend can even reverse from negative to positive after the 1990s in Xinjiang(XJ)and Yangtze River Basin(YR),and from positive to negative in *** overall trends of FirstEHD over NC,YR,and XJ during 1960-2018 are dominated by the trends before the 1990s,while they are dominated by the sharp advance after the 1990s over *** is further found that the trend of FirstEHD can generally be explained by the long-term trend in T_(max) over most parts of China,but the contribution from T_(max) variabilities is also non-negligible and can even account for more than 75% of the overall trend over *** possible factors responsible for the decadal changes in FirstEHD trends are also discussed.

关键词： Extreme hot days Onset date Trend Decadal change Variability of maximum temperature

A NOVEL SIMULTANEOUS NOISE AND INPUT VSWR MATCHING TECHNIQUE FOR BROADBAND LNA

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Journal of Electronics(China) 2010年第4期27卷 446-452页

作者： Nie zhaohui Bao Jingfu lin Ping Cai Fajuan University of Electronic Science and Technology of China Chengdu 611731 China China South Industries Group Corporation （Chengdu） Fire Control Technology Center Chengdu 611731 China

The Simultaneous Noise and Input Voltage Standing Wave Ratio (VSWR) Matching (SNIM) condition for Low Noise Amplifier (LNA), in principle, can only be satisfied at a single fre-quency. In this paper, by analyzing the fundamental limitations of the narrowband SNIM technique for the broadband application, the authors present a broadband SNIM LNA systematic design technique. The designed LNA guided by the proposed methodology achieves 10 dB power gain with a low Noise Figure of 0.53 dB. Meanwhile, it provides wonderful input matching of 27 dB across the fre-quency range of 3～5 GHz. Therefore, broadband SNIM is realized.

关键词： Low Noise Amplifier (LNA) Minimum Noise Figure Minimum input VSWR Simultaneous Noise and Input VSWR Matching (SNIM)

CAS-ESM2.0 Model Datasets for the CMIP6 Flux-Anomaly-Forced Model Intercomparison Project (FAFMIP)

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Advances in Atmospheric Sciences 2021年第2期38卷 296-306页

作者： Jiangbo JIN He ZHANG Xiao DONG Hailong LIU Minghua ZHANG Xin GAO Juanxiong HE Zhaoyang CHAI Qingcun ZENG Guangqing ZHOU zhaohui lin Yi YU Pengfei lin Ruxu LIAN Yongqiang YU Mirong SONG Dongling ZHANG International Center for Climate and Environment Sciences Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China State Key Laboratory of Satellite Ocean Environment Dynamics Second Institute of OceanographyMinistry of Natural ResourcesHangzhou 310012China 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 Institute of Atmospheric Physics Chinese Academy of SciencesBeijing 100029China

The second version of the Chinese Academy of Sciences Earth System Model(CAS-ESM2.0)is participating in the Flux-Anomaly-Forced Model Intercomparison Project(FAFMIP)experiments in phase 6 of the Coupled Model Intercomparison Project(CMIP6).The purpose of FAFMIP is to understand and reduce the uncertainty of ocean climate changes in response to increased CO2 forcing in atmosphere-ocean general circulation models(AOGCMs),including the simulations of ocean heat content(OHC)change,ocean circulation change,and sea level rise due to thermal *** experiments(including faf-heat,faf-stress,faf-water,faf-all,faf-passiveheat,faf-heat-NA50pct and faf-heat-NA0pct)have been *** of the experiments were integrated over a 70-year period and the corresponding data have been uploaded to the Earth System Grid Federation data server for CMIP6 users to *** paper describes the experimental design and model datasets and evaluates the preliminary results of CAS-ESM2.0 simulations of ocean climate changes in the FAFMIP *** simulations of the changes in global ocean temperature,Atlantic Meridional Overturning Circulation(AMOC),OHC,and dynamic sea level(DSL),are all reasonably reproduced.

关键词： CAS-ESM2.0 CMIP6 FAFMIP AMOC ocean heat uptake dynamic sea level change

CAS-ESM2.0 Model Datasets for the CMIP6 Ocean Model Intercomparison Project Phase 1 (OMIP1)

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Advances in Atmospheric Sciences 2021年第2期38卷 307-316页

作者： Xiao DONG Jiangbo JIN Hailong LIU He ZHANG Minghua ZHANG Pengfei lin Qingcun ZENG Guangqing ZHOU Yongqiang YU Mirong SONG zhaohui lin Ruxu LIAN Xin GAO Juanxiong HE Dongling ZHANG Kangjun CHEN International Center for climate and Environment Sciences Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China 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 Institute of Atmospheric Physics Chinese Academy of SciencesBeijing 100029China

As a member of the Chinese modeling groups,the coupled ocean-ice component of the Chinese Academy of Sciences’Earth System Model,version 2.0(CAS-ESM2.0),is taking part in the Ocean Model Intercomparison Project Phase 1(OMIP1)experiment of phase 6 of the Coupled Model Intercomparison Project(CMIP6).The simulation was conducted,and monthly outputs have been published on the ESGF(Earth System Grid Federation)data *** this paper,the experimental dataset is introduced,and the preliminary performances of the ocean model in simulating the global ocean temperature,salinity,sea surface temperature,sea surface salinity,sea surface height,sea ice,and Atlantic Meridional Overturning Circulation(AMOC)are *** results show that the model is at quasi-equilibrium during the integration of 372 years,and performances of the model are reasonable compared with *** dataset is ready to be downloaded and used by the community in related research,e.g.,multi-ocean-sea-ice model performance evaluation and interannual variation in oceans driven by prescribed atmospheric forcing.

关键词： OGCM CMIP6 OMIP1 AMOC ocean temperature/salinity sea ice

A Review of Seasonal Climate Prediction Research in China

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Advances in Atmospheric Sciences 2015年第2期32卷 149-168页

作者： WANG Huijun FAN Ke SUN Jianqi LI Shuanglin lin zhaohui ZHOU Guangqing CHEN Lijuan LANG Xianmei LI Fang ZHU Yali CHEN Hong ZHENG Fei Nansen-Zhu International Research Center Institute of Atmospheric Physics Chinese Academy of Sciences Climate Change Research Center Chinese Academy of Sciences Institute of Atmospheric Physics Chinese Academy of Sciences National Climate Center China Meteorological Administration

The ultimate goal of climate research is to produce climate predictions on various time scales. In China, efforts to predict the climate started in the 1930 s. Experimental operational climate forecasts have been performed since the late 1950 s,based on historical analog circulation patterns. However, due to the inherent complexity of climate variability, the forecasts produced at that time were fairly inaccurate. Only from the late 1980 s has seasonal climate prediction experienced substantial progress, when the Tropical Ocean and Global Atmosphere project of the World Climate Research program（WCRP） was launched. This paper, following a brief description of the history of seasonal climate prediction research, provides an overview of these studies in China. Processes and factors associated with the climate variability and predictability are discussed based on the literature published by Chinese scientists. These studies in China mirror aspects of the climate research effort made in other parts of the world over the past several decades, and are particularly associated with monsoon research in East Asia. As the climate warms, climate extremes, their frequency, and intensity are projected to change, with a large possibility that they will increase. Thus, seasonal climate prediction is even more important for China in order to effectively mitigate disasters produced by climate extremes, such as frequent floods, droughts, and the heavy frozen rain events of South China.

关键词： seasonal prediction climate variability predictability

Introduction and systematic assessment for IAP numerical annual climate prediction system

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Chinese Science Bulletin 2003年第S2期48卷 56-61页

作者： CHEN Hong, lin zhaohui & ZENG Qingcun International Center for Climate and Environmental Sciences (ICCES), Institute of Atnlospheric Physics, Chinese Academy of Sciences, Bcijing 100029, China Chinese Acad Sci Inst Atmospher Phys ICCES Beijing 100029 Peoples R China

The IAP numerical annual climate predictionsystem has been presented in this paper. In order to evaluatethis annual prediction system, annual ensemble hindcastexperiments over a 21-year period from 1980 to 2000 havebeen done. Systematic assessment shows that this annualprediction system has higher predictability for summer cli-mate in tropic than in extra-tropic area, and higher predict-abilities over ocean than over land for the fields of precipita-tion, sea level pressure and surface air temperature; for 500hPa geopotential height field, the predictability assuming azonal distribution decreases from tropic to middle-high lati-tudes, and in China it is the highest among those of all *** analysis shows that the prediction ability of IAPannual prediction system to summer temperature is higherthan that to precipitation, and the prediction skill can beremarkably improved by the correction system. Furthermore,the comparison between annual and extraseasonal hindcastsindicates that precipitation hindcasted extraseasonally isbetter than that done annually, and the major discrepancyexists in middle-high latitudes.

关键词： climale prediction annual prediction predictability.

大红山铁铜矿床Ⅱ号矿组周边小矿体地质特征及找矿方向探讨

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中国矿业 2019年第A1期28卷 238-241页

作者：蔺朝晖云南泛亚勘探技术有限公司云南昆明650300

大红山铁铜矿床大地构造位置处于康滇地轴南端,是我国重要的元古宙铁铜矿床分布区。矿区成矿条件优越,含矿地层为大红山群曼岗河组、红山组地层。矿区内厚大的Ⅱ号铁矿体赋存于红山组地层中,小矿体多产于Ⅱ号矿体周边,总体受构造控制,... 详细信息

大红山铁铜矿床大地构造位置处于康滇地轴南端,是我国重要的元古宙铁铜矿床分布区。矿区成矿条件优越,含矿地层为大红山群曼岗河组、红山组地层。矿区内厚大的Ⅱ号铁矿体赋存于红山组地层中,小矿体多产于Ⅱ号矿体周边,总体受构造控制,边部常产有辉长辉绿岩体。本文总结小矿体地质特征、找矿标志,并对其找矿方向进行分析。认为通过进一步地质工作,在主矿体周边具有较好的小矿体找矿前景。

关键词：大红山铁矿 Ⅱ号矿体小矿体辉长辉绿岩