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Science China Earth Sciences 2018年第7期61卷 951-956页

作者： qingcun zeng Lin WU Institute of Atmospheric Physics Chinese Academy of Sciences

The ultimate solution to anthropogenic air pollution depends on an adjustment and upgrade of industrial and energy structures. Before this process can be completed, reducing the anthropogenic pollutant emissions is an effective measure. This is a problem belonging to "Natural Cybernetics", i.e., the problem of air pollution control should be solved together with the weather prediction; however, this is very complicated. Considering that heavy air pollution usually occurs in stable weather conditions and that the feedbacks between air pollutants and meteorological changes are insufficient, we propose a simplified natural cybernetics method. Here, an off-line air pollution evolution equation is first solved with data from a given anthropogenic emission inventory under the predicted weather conditions, and then, a related "incomplete adjoint problem" is solved to obtain the optimal reduction of anthropogenic emissions. Usually, such solution is sufficient for satisfying the air quality and economical/social requirements. However, a better solution can be obtained by iteration after updating the emission inventory with the reduced anthropogenic emissions. Then, this paper discusses the retrieval of the pollutant emission source with a known spatio-temporal distribution of the pollutant concentrations, and a feasible mathematical method to achieve this is proposed. The retrieval of emission source would also help control air pollution.

关键词： Air pollution Optimal control Source retrieval Incomplete adjoint operator

Optimal reduction of anthropogenic emissions for air pollution control and the retrieval of emission source from observed pollutantsⅢ:Emission source inversion using a double correction iterative method

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Science China Earth Sciences 2022年第3期65卷 553-555页

作者： qingcun zeng Lin WU Institute of Atmospheric Physics Chinese Academy of SciencesBeijing 100029China

Using the incomplete adjoint operator method in part I of this series of papers,the total emission source S can be retrieved from the pollutant concentrationsρob obtained from the air pollution monitoring *** paper studies the problem of retrieving anthropogenic emission sources from *** that the natural source Sn is known,and as the internal source Sc due to chemical reactions is a function of pollutant concentrations,if the chemical reaction equations are complete and the parameters are accurate,Sc can be calculated directly fromρob,and then Sa can be obtained from ***,if the chemical reaction parameters(denoted asγ)are insufficiently accurate,bothγand Sc should be *** article proposes a"double correction iterative method"to retrieve Sc and correctγand proves that this iterative method converges.

关键词： Air pollution Anthropogenic emission source Source due to chemical reaction Source retrieval Incomplete adjoint operator Double correction iterative method

An Overview of the Dynamic Framework in Earth-System Model and Its Well-Posedness

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Chinese Annals of Mathematics,Series B 2023年第6期44卷 803-818页

作者： Ruxu LIAN qingcun zeng International Center for Climate and Environment Sciences Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China School of Mathematics and Statistics North China University of Water Resources and Electric PowerZhengzhou 450046China

The well-posedness of the dynamic framework in earth-system model(ESM for short)is a common issue in earth sciences and *** this paper,the authors first introduce the research history and fundamental roles of the well-posedness of the dynamic framework in the ESM,emphasizing the three core components of ESM,i.e.,the atmospheric general circulation model(AGCM for short),land-surface model(LSM for short)and oceanic general circulation model(OGCM for short)and their ***,some research advances made by their own research group are ***,future research prospects are discussed.

关键词： Earth-System model Dynamic framework Well-posedness

Stability of weak solutions to climate dynamics model with effects of topography and non-constant external force

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Science China Earth Sciences 2018年第1期61卷 47-59页

作者： LIAN RuXu zeng qingcun JIN JiangBo Institute of Atmospheric Physics Chinese Academy of Sciences

In this paper, a climate dynamics model with the effects of topography and a non-constant external force, which consists of the Navier-Stokes equations and a temperature equation arising from the evolution process of the atmosphere, was *** certain assumptions imposed on the initial data and by using some delicate estimates and compactness arguments, we proved the L^1-stability of weak solutions to the atmospheric equations.

关键词： Climate dynamics Atmospheric equations Weak solutions Stability topography

Optimal reduction of anthropogenic emissions for air pollution control and the retrieval of emission source from observed pollutants II: Iterative optimization using a positive-negative discriminant

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Science China Earth Sciences 2020年第5期63卷 726-730页

作者： qingcun zeng Lin WU Kece FEI Institute of Atmospheric Physics Chinese Academy of SciencesBeijing 100029China

In part Ⅰ of this paper series, the application of an incomplete adjoint operator to calculate the optimal reduction of the total emissions S was suggested. This paper, part Ⅱ of the series, focuses on calculating the reduction of the anthropogenic emission source S. As aSc(the source term due to the chemical reaction in the atmosphere) is a complex function of the pollutant concentration, we propose an iterative optimization method using a positive-negative discriminant to obtain Sfrom he aS. Tconvergence of the iterations is also proven in this paper.

关键词： Air pollution Anthropogenic emission source Source due to chemical reaction Optimal control Iterative optimization Positive-negative discriminant

Stochastic modeling the effect of wind gust on dust entrainment during sand storm

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Chinese Science Bulletin 2012年第27期57卷 3595-3602页

作者： CHENG XueLing zeng qingcun HU Fei State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China

After the passage of a cold front,spring in northern China the outbreak of strong wind is often accompanied by dust *** to the coherent structure of wind gust,dust particles can effectively overcome the systematic descending air motion and penetrate into the middle and upper levels of the atmospheric boundary layer,and then propagate further and diffuse into the troposphere where ascending air motion ***,we consider the coherent structure of wind gust in LS models,and construct a model suitable for the dust entrainment under the dust-storm *** the parameter of gust,we simulate the dust entrainment during dust storms,and test that the coherent structures of wind gust make the sand particles to reach the upper of the boundary layer.

关键词：沙尘暴过程阵风粉尘随机建模夹带大气边界层相干结构气流运动

Formulation of a new ocean salinity boundary condition and impact on the simulated climate of an oceanic general circulation model

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Science China Earth Sciences 2017年第3期60卷 491-500页

作者： JIN JiangBo zeng qingcun WU Lin LIU HaiLong ZHANG MingHua Institute of Atmospheric Physics Chinese Academy of Sciences College of Earth Sciences University of Chinese Academy of Sciences School of Marine and Atmospheric Sciences Stony Brook University

The salinity boundary condition at the ocean surface plays an important role in the stability of long-term integrations of an oceanic general circulation model （OGCM） and in determining its equilibrium solutions. This study presents a new formulation of the salt flux calculation at the ocean surface based on physical processes of salt exchange at the air-sea interface. The formulation improves the commonly used virtual salt flux with constant reference salinity by allowing for spatial correlations between surface freshwater flux and sea-surface salinity while preserving the conservation of global salinity. The new boundary condition is implemented in the latest version of the National Key Laboratory of NumericaI Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics/Institute of Atmospheric Physics Climate Ocean Model version 2 （LICOM2.0）. The impact of the new boundary condition on the equilibrium simulations of the model is presented. It is shown that the new formulation leads to a stronger Atlantic meridional overturning circulation （AMOC） that is closer to observational estimates. It also slightly improves poleward heat transport by the oceans in both the Atlantic and the global oceans.

关键词： OGCM Surface salinity boundary condition Virtual salinity flux Upward salt flux from oceanic surface AMOC

The source of Double ITCZ induced by the SST bias over the tropical western Pacific as reflected in CAS-ESM2 Model

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Science China Earth Sciences 2024年第5期67卷 1604-1615页

作者： Jinning TONG Fei ZHENG Jiangbo JIN Ruowen YANG Jiang ZHU qingcun zeng Department of Atmospheric Sciences Yunnan UniversityKunming 650091China International Center for Climate and Environment Science Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China

“Double ITCZ”is a common precipitation bias over the tropical Pacific in current climate models and Earth system models,but the reasons for its formation are still worth exploring and *** this study,we adopted the second version of Chinese Academy of Sciences Earth System Model(CAS-ESM2),by comparing a set of sea surface temperature(SST)bias correction experiments over the tropical Pacific,to explore the possible mechanism of SST bias on inducing the“Double ITCZ”from the perspective of the climatic annual mean bias in the coupled *** revealed that the simulated climatic annual mean SST bias over the tropical Pacific can affect the bias of latent heat flux through the saturation specific humidity,and the bias of latent heat flux can further affect that of vertical velocity of humid air by the condensation release mechanism,and finally modulate the simulated bias in ***,through the inter-comparison between different experiments,it is found that the source of Double ITCZ might mainly come from the annual mean SST bias over the tropical western Pacific through the proposed air-sea coupled process of“SST-saturated specific humidity-latent heat flux-vertical velocity-precipitation”,indicating a possible way on reducing the couple biases in models over the tropical Pacific to improve the accuracy of CAS-ESM2 for climate simulation.

关键词： SST bias Double ITCZ Nudging SST CAS-ESM2

Recent Advances in Monsoon Studies in China

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Advances in Atmospheric Sciences 2015年第2期32卷 206-229页

作者： XUE Feng zeng qingcun HUANG Ronghui LI Chongyin LU Riyu ZHOU Tianjun Institute of Atmospheric Physics Chinese Academy of Sciences

This review provides a synopsis of the major progress that has been made in monsoon studies in China and to further bridge the gap between the Chinese and international meteorological community. It consists of seven major sections. After the introduction, the second section begins with the global monsoon systems and their seasonal variation, based on some new methods proposed in recent years. Besides, some major intraseasonal features of East Asian monsoon, including the onset of South China Sea summer monsoon are discussed. In the third section, we review the interactions between ENSO and the East Asian monsoon, focusing in particular on the results of Chinese meteorologists that indicate the influence of ENSO on the East Asian summer monsoon（EASM） is obviously different from that on the tropical monsoon. Besides the tropical Pacific,other ocean basins, such as the Indian Ocean and the Atlantic Ocean, are also important to the East Asian monsoon, and this topic is discussed in the fourth section. In the fifth section, we address the role of land surface processes in East Asian monsoon. For example, we describe work that has shown more snow cover in spring on the Tibetan Plateau is followed by a weakened EASM and more summer rainfall in the Yangtze River valleys. The sixth section focuses on the influence of atmospheric circulation in the Southern Hemisphere（SH） on EASM, demonstrating how the signal from the SH is likely to provide new clues for the seasonal forecasting of summer rainfall in China. Finally, in the seventh section, we concentrate on the interdecadal variations of EASM. In particular, we look at a significant interdecadal variation that occurred at the end of the 1970 s, and how our understanding of this feature could affect forecasting ability.

关键词： East Asian monsoon global monsoon system ENSO interannual variability interdecadal variability

Different Turbulent Regimes and Vertical Turbulence Structures of the Urban Nocturnal Stable Boundary Layer

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Advances in Atmospheric Sciences 2023年第6期40卷 1089-1103页

作者： Yu SHI qingcun zeng Fei HU Weichen DING Zhe ZHANG Kang ZHANG Lei LIU State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China University of Chinese Academy of Sciences Beijing 100049China

Turbulence in the nocturnal boundary layer(NBL)is still not well characterized,especially over complex underlying ***,gradient tower data and eddy covariance data collected by the Beijing 325-m tower were used to better understand the differentiating characteristics of turbulence regimes and vertical turbulence structure of urban the *** for heights above the urban canopy layer(UCL),the relationship between turbulence velocity scale(VTKE)and wind speed(V)was consistent with the“HOckey-Stick”(HOST)theory proposed for a relatively flat *** regimes have been identified according to urban nocturnal stable boundary *** 1 occurs where local shear plays a leading role for weak turbulence under the constraint that the wind speed VVT and is mainly driven by bulk *** 3 is identified by the existence of moderate turbulence when upside-down turbulence sporadic bursts occur in the presence of otherwise weak *** 4 is identified as buoyancy turbulence,when V>VT,and the turbulence regime is affected by a combination of local wind shear,bulk shear and buoyancy *** turbulence activities demonstrated a weak thermal stratification dependency in regime 1,for which within the UCL,the turbulence intensity was strongly affected by local wind shear when V<*** study further showed typical examples of different stable boundary layers and the variations between turbulence regimes by analyzing the evolution of wind *** because of the influence of large-scale motions,the power spectral density of vertical velocity for upsidedown structure showed an increase at low *** upside-down structures were also characterized by the highest frequency of the stable stratifications in the higher layer.

关键词： urban canopy layer stable boundary layer upside-down turbulence vertical structure