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Natural and human-induced changes in summer climate over the East Asian monsoon region in the last half century: A review

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Advances in Climate Change Research 2015年第2期6卷 131-140页

作者： zhang ren-he State Key Laboratory of Severe Weather (La SW) Chinese Academy of Meteorological Sciences

In the last half century,a significant warming trend occurred in summer over eastern China in the East Asian monsoon ***,there were no consistent trends with respect to the intensity of the East Asian summer monsoon(EASM) or the amount of summer rainfall averaged over eastern *** of the EASM and summer rainfall exhibited clear decadal *** decadal shifts of EASM occurred around the mid- and late 1970 s,the late 1980 s and the early 1990 s,and the late 1990 s and early 2000 s,*** rainfall over eastern China exhibited a change in spatial distribution in the decadal timescale,in response to the decadal shifts of *** the mid- and late 1970 s to the late 1980 s and the early 1990 s,there was a meridional tri-polar rainfall distribution anomaly with more rainfall over the Yangtze River valley and less rainfall in North and South China; but in the period from the early 1990 s to the late 1990 s and the early 2000 s the tri-polar distribution changed to a dipolar one,with more rainfall appearing over southern China south to the Yangtze River valley and less rainfall in North ***,from the early 2000 s to the late 2000 s,the Yangtze River valley received less *** decadal changes in EASM and summer rainfall over eastern China in the last half century are closely related to natural internal forcing factors such as Eurasian snow cover,Arctic sea ice,sea surface temperatures in tropical Pacific and Indian Ocean,oceaneatmospheric coupled systems of the Pacific Decadal Oscillation(PDO) and AsianePacific Oscillation(APO),and uneven thermal forcing over the Asian *** to now,the roles of anthropogenic factors,such as greenhouse gases,aerosols,and land usage/cover changes,on existing decadal variations of EASM and summer rainfall in this region remain uncertain.

关键词： East Asian summer monsoon Summer rainfall over eas

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A Novel Nonlinear Optimization Method of Inversion for Sea-Bottom Properties

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Chinese Physics Letters 1997年第11期14卷 853-856页

作者： XIAO Ling zhang ren-he LI Feng-hua National Laboratory of Acoustics Institute of AcousticsChinese Academy of SciencesBeijing 100080

A nonlinear optimization method is proposed to inverse the sea-bottom *** method is called seed division algorithm(SDA)and can be used to solve global optimization problem.A numerical test is carried out to inverse th... 详细信息

关键词： properties. theory. Inversion

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Changes in Texture and Retorting Yield in Oil Shale During Its Bioleaching by Bacillus Mucilaginosus

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Chemical Research in Chinese Universities 2013年第2期29卷 294-298页

作者： zhang Xue-qing ren he-jun LIU Na zhang Lan-ying ZHOU Rui Key Lab of Groudwater Resources and Environment Ministry of Education College of Environment and Resources Jilin University Changchun 130012 P. R. China

Bioleaching of oil shale by Bacillus mucilaginosus was carried out in a reaction column for 13 d. The pH value of the leaching liquor decreased steadily from 7.5 to 5.5 and the free silicon dioxide concentration reached approximately 200 mg/L in it. Scanning electron microscopy（SEM） observations revealed that a mass of small particles separated from the matrix of oil shale. Energy dispersive spectrometry（EDS） analysis implied that the total content of Si,O, A1 was decreased in the particle area of the matrix. These facts indicate that the silicate was removed, leading to the structural transformation of oil shale. Comparison of the shale oil yields before and after bioleaching illustrated that approximately 10% extra shale oil was obtained. This finding suggests that the demineralisation of the oil shale by silicate bacteria improves shale oil yield.

关键词： Oil shale Bacillus mucilaginosus Bioleaching Shale oil yield

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Applications of Waveguide Invariant Theory to the Analysis of Interference Phenomena in Deep Water

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Chinese Physics Letters 2011年第3期28卷 114-116页

作者： LI Qian-Qian LI Zheng-Lin zhang ren-he State Key Laboratory of Acoustics Institute of AcousticsChinese Academy of SciencesBeijing 100190 Haikou Laboratory Institute of AcousticsChinese Academy of SciencesHaikou 570105 Graduate University of Chinese Academy of Sciences Beijing 100190

The waveguide invariant,denoted asβ,can be used to describe the slope of the intensity of a broadband acoustic *** deep water,the interference patterns of the areas with dominant waterborne modes and only with bottom bounce modes are greatly *** phenomenon is illustrated by simulation and explained by the distribution ofβ.The theory shows that in the convergence zone,βapproaches infinity,which leads to the larger slope of sound intensity;on the contrary,in the shadow zone,βis close to 1,leading to smaller slopes.

关键词： waveguide Waveguide Deep

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Generalized Coupled-Mode Formulation for Sound Propagation in Range-Dependent Waveguides

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Chinese Physics Letters 2012年第1期29卷 168-171页

作者： LUO Wen-Yu YANG Chun-Mei zhang ren-he State Key Laboratory of Acoustics Institute of AcousticsChinese Academy of SciencesBeijing 100190 Graduate University of Chinese Academy of Sciences Beijing 100049

An accurate and numerically stable method based on the coupled-mode theory is *** applying the direct global matrix approach to obtain the modal expansion coefficients,this method is numerically *** addition,appropriately normalized range solutions are introduced,which resolves the overflow problem ***,we put forward source conditions appropriate for the line-source problem in plane *** a result,this method is capable of dealing with the scenario where a line source is located inside the region of a ***-form expressions for coupling matrices are provided for ideal *** results indicate that the present method is accurate and numerically ***,this model can serve as a benchmark in range-dependent propagation modeling.

关键词： deformation. entirely dealing

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Matched Field Source Localization via Environmental Focalization

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Chinese Physics Letters 2013年第2期30卷 147-150页

In a realistic application of matched field processing for source localization,the ability to localize an acoustic source is strongly affected by the uncertainty of the ***,accurate environment measurement is a difficult task in large regions of the *** employ a Bayesian approach,referred to here as focalization,to overcome the mismatch by including the environment in the parameter search *** maximizes the posterior probability density over the unknown source and environmental *** broadband signals recorded by a vertical line array in a Yellow Sea experiment are presented to demonstrate the feasibility of focalization.

关键词： parameters. space. overcome

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Bubble Pulse Cancelation in the Time-Frequency Domain Using Warping Operators

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Chinese Physics Letters 2013年第8期30卷 95-98页

作者： NIU Hai-Qiang zhang ren-he LI Zheng-Lin GUO Yong-Gang he Li State Key Laboratory of Acoustics Institute of AcousticsChinese Academy of SciencesBeijing 100190 University of Chinese Academy of Sciences Beijing 100049 Haikou Laboratory of Acoustics Institute of AcousticsChinese Academy of SciencesHaikou 570105

The received shock waves produced by explosive charges are often polluted by bubble pulses in underwater acoustic experiments.A method based on warping operators is proposed to cancel the bubble pulses in the time-frequency *** is applied to the explosive data collected during the Yellow Sea experiment in November *** original received signal is first transformed into a warped signal by warping ***,the warped signal is analyzed in the time-frequency *** to the different features between the shock waves and the bubble pulses in the time-frequency domain for the warped signal,the bubble pulses can be easily filtered ***,the shock waves in the original time domain can be retrieved by the inverse warping *** autocorrelation functions and the time-frequency representation show that the bubble pulses can be canceled effectively.

关键词： domain bubble filtered

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ECHAM5-Simulated Impacts of Two Types of El Nio on the Winter Precipitation Anomalies in South China

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Atmospheric and Oceanic Science Letters 2013年第5期6卷 360-364页

作者： SU Jing-Zhi zhang ren-he ZHU Cong-Wen Chinese Academy of Meteorological Sciences

The authors used an atmospheric general circulation model （AGCM） of European Centre Hamburg Model （ECHAM5.4） and investigated the possible impacts of eastern Pacific （EP） and central Pacific （CP） El Ni（n）o on the winter precipitation anomalies in South China.A composite analysis suggested much more rainfall during the mature phase of EP El Ni（n）o than in the case of CP El Ni（n）o,and their corresponding observed wet centers to be located in the southeast coast and the region to the south of the Yangtze River,*** obtained on the basis of model-sensitive run imply that the modelsimulated rainfall anomalies agree well with the observation,and the magnitude of simulated rainfall anomalies were found to be reduced when the amplitude of sea surface temperature anomaly （SSTA） forcing of EP and CP El Ni（n）o was cut *** results imply that the rainfall anomaly in South China is very sensitive not only to the type of El Ni（n）o but also to its intensity.

关键词： eastern/central Pacific El Ni(n)o precipitation ECHAM5 South China

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Three-Dimensional Sound Propagation and Scattering in Two-Dimensional Waveguides

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Chinese Physics Letters 2013年第11期30卷 120-123页

作者： QIN Ji-Xing LUO Wen-Yu zhang ren-he YANG Chun-Mei State Key Laboratory of Acoustics Institute of AcousticsChinese Academy of SciencesBeijing 100190 University of Chinese Academy of Sciences Beijing 100049

A coupled-mode method for three-dimensional acoustic propagation and scattering in two-dimensional waveguides is *** method synthesizes the three-dimensional field solution by using Fourier transform techniques based on a sequence of two-dimensional problems,each of which is solved by a numerical model recently developed by Luo et al.[***.29(2012)014302].Numerical results indicate that the present model is remarkably accurate,and thus can serve as benchmark against other numerical *** addition,this model can be applied to realistic problems,and can also be used to analyze horizontal refraction in some range-dependent waveguides in reality,such as the continental shelf environment,ridge-like bathymetry,and underwater trenches.

关键词： trench scattering waveguides

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Sound Propagation in a Wedge with a Rigid Bottom

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Chinese Physics Letters 2012年第10期29卷 89-92页

作者： LUO Wen-Yu YANG Chun-Mei QIN Ji-Xing zhang ren-he State Key Laboratory of Acoustics Institute of AcousticsChinese Academy of SciencesBeijing 100190 Graduate University of Chinese Academy of Sciences Beijing 100049

Sound propagation in a wedge with perfectly reflecting boundaries is one of the few range-dependent problems with an analytical *** sound propagation towards the wedge apex will be completely backscattered due to the perfectly reflecting boundaries,this test problem is an ideal benchmark for a full two-way solution to the wave *** analytical solution for sound propagation in a wedge with a pressure-release sea surface and a pressure-release bottom was presented by Buckingham et al.[***.87(1990)1511].The ideal wedge problem with a rigid bottom is also of great importance in underwater *** present an analytical solution to the problem with a wedge bounded above by a pressure-release sea surface and below by a rigid bottom,which may be used to provide informative means of investigating the sound field in depth-varying channels,and to establish the accuracy of numerical propagation models for which it is difficult to treat problems with a pressure-release bottom.A comparison of the analytical solution and the numerical solution recently proposed by Luo et al.[***.29(2012)014302]is also presented,indicating that this numerical propagation model provides high accuracy.

关键词： equation solution wedge

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