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Latitude-Dependent Response of East Asian Summer Monsoon to external forcing in the Last Millennium

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Acta meteorologica Sinica 2010年第6期24卷 671-679页

作者：顾亚进王红丽刘健 School of Atmospheric Sciences Nanjing University of Information Science & Technology State Key Laboratory of Lake Science and Environment Nanjing Institute of Geography and LimnologyChinese Academy of Sciences

Response of the East Asian summer monsoon（EASM） rainfall to external forcing（insolation,volcanic aerosol,and greenhouse gases） is investigated by analysis of a millennium simulation with the coupled climate model *** model reproduces reasonably realistic present-day EASM *** simulated precipitation variation in East Asia over the last millennium compares favorably with the observed and proxy *** is found that the features and sensitivity of the forced response depend on *** the centennial-millennial time scale（CMTS）,the extratropical precipitation closely follows the variation of the effective radiative forcing（insolation plus radiative effects of volcanic aerosols）.The subtropical precipitation is less sensitive but the differences of this variable between the Medieval Warm Period（MWP） and Little Ice Age（LIA） remain *** tropical rainfall is insensitive to the external *** is also found that the precipitation variations in the extratropics and subtropics are in phase on the CMTS,while they are anti-correlated on the interannual time *** intertropical convergence zone（ITCZ） and subtropical precipitation are anti-correlated on the CMTS,so are they on the interannual time *** findings suggest that the proxy data in the extratropical East Asia more sensitively reflect the EASM variations,and this has important implications on interpretation of paleo-proxy records.

关键词： East Asian summer monsoon(EASM) external forcing precipitation millennium

THE EFFECTS OF external forcing,DISSIPATION AND NONLINEARITY ON THE SOLUTIONS OF ATMOSPHERIC EQUATIONS

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Acta meteorologica Sinica 1997年第1期11卷 57-65页

作者：李建平丑纪范 Department of Atmospheric Sciences Lanzhou University.Lanzhou 730000

Based on the primitive equations of the atmosphere,we study the effects of external forcing. dissipation and nonlinearity on the solutions of stationary motion and non-stationary *** results show that the asymptotic behavior of solutions of the forced dissipative nonlinear system is essentially different from that of the adiabatic non-dissipative system,the adiabatic dissipative system,the diabatic non-dissipative system and the diabatic dissipative linear system,and that the joint action of external forcing,dissipation and nonlinearity is the source of multiple equilibria. From this we can conclude that the important actions of diabatic heating and dissipation must be considered in the models of the long-term weather and the climate.

关键词： external forcing dissipation nonlinearity operator equation asymptotic behavior attractor

Variation of Surface Temperature during the Last Millennium in a Simulation with the FGOALS-gl Climate System Model

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Advances in Atmospheric Sciences 2013年第3期30卷 699-712页

作者：张洁 Laurent LI 周天军辛晓歌 State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics Institute of Atmospheric Physics Chinese Academy of Sciences Laboratoire de Météorologie Dynamique/CNRS Université Paris 6 National Climate Center China Meteorological Administration

A reasonable past millennial climate simulation relies heavily on the specified external forcings, including both natural and anthropogenic forcing agents. In this paper, we examine the surface temperature responses to specified external forcing agents in a millennium-scale transient climate simulation with the fast version of LASG IAP Flexible Global Ocean-Atmosphere-Land System model （FGOALS-gl） developed in the State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric Physics （LASG/IAP）. The model presents a reasonable performance in comparison with reconstructions of surface temperature. Differentiated from significant changes in the 20th century at the global scale, changes during the natural-forcing-dominant period are mainly manifested in the Northern Hemisphere. Seasonally, modeled significant changes are more pronounced during the wintertime at higher latitudes. This may be a manifestation of polar amplification associated with sea-ice-temperature positive feedback. The climate responses to total external forcings can explain about half of the climate variance during the whole millennium period, especially at decadal timescales. Surface temperature in the Antarctic shows heterogeneous and insignificant changes during the preindustrial period and the climate response to external forcings is undetectable due to the strong internal variability. The model response to specified external forcings is modulated by cloud radiative forcing （CRF）. The CRF acts against the fluctuations of external forcings. Effects of clouds are manifested in shortwave radiation by changes in cloud water during the natural-forcing-dominant period, but mainly in longwave radiation by a decrease in cloud amount in the ant hropogenic- forcing-dominant period.

关键词： last millennium external forcing surface temperature cloud radiative forcing climate system model

Atmospheric Circulation Patterns over East Asia and Their Connection with Summer Precipitation and Surface Air Temperature in Eastern China during 1961–2013

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Journal of Meteorological Research 2018年第2期32卷 203-218页

作者： Shuping LI Wei HOU Guolin FENG College of Atmospheric Sciences Lanzhou University Lanzhou 730000 National Climate Center China Meteorological Administration Beijing 100081 College of Physical Science and Technology Yangzhou University Yangzhou 225000

Based on the NCEP/NCAR reanalysis data and Chinese observational data during 1961–2013, atmospheric circulation patterns over East Asia in summer and their connection with precipitation and surface air temperature in eastern China as well as associated external forcing are investigated. Three patterns of the atmospheric circulation are identified, all with quasi-barotropic structures：（1） the East Asia/Pacific（EAP） pattern,（2） the Baikal Lake/Okhotsk Sea（BLOS） pattern, and（3） the eastern China/northern Okhotsk Sea（ECNOS） pattern. The positive EAP pattern significantly increases precipitation over the Yangtze River valley and favors cooling north of the Yangtze River and warming south of the Yangtze River in summer. The warm sea surface temperature anomalies over the tropical Indian Ocean suppress convection over the northwestern subtropical Pacific through the Ekman divergence induced by a Kelvin wave and excite the EAP pattern. The positive BLOS pattern is associated with below-average precipitation south of the Yangtze River and robust cooling over northeastern China. This pattern is triggered by anomalous spring sea ice concentration in the northern Barents Sea. The anomalous sea ice concentration contributes to a Rossby wave activity flux originating from the Greenland Sea, which propagates eastward to North Pacific. The positive ECNOS pattern leads to below-average precipitation and significant warming over northeastern China in summer. The reduced soil moisture associated with the earlier spring snowmelt enhances surface warming over Mongolia and northeastern China and the later spring snowmelt leads to surface cooling over Far East in summer, both of which are responsible for the formation of the ECNOS pattern.

关键词： atmospheric circulation patterns precipitation surface air temperature external forcing

Behaviour　of　Coupled　Modes　in　a　Simple　Nonlinear　Air-Sea　Interaction　Model

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Advances in Atmospheric Sciences 1996年第2期13卷 183-195页

作者：李崇银廖清海 LASG Institute of Atmospheric Physics Chinese Academy of Sciences Beijing

In this article, a model with the simplest framework is constructed and solved analytically. It is shown that intraseasonal wave coexists with interannual variation, and ENSO cycle arises from coupled Kelvin wave destabilisation. Its irregularity can be related to reasonable model parameters. external processes have some important effects on nonlinear air-sea interaction modes.

关键词： Nonlinear Stationary coupled instability external forcing Multiscale

Impacts of internal climate variability on meteorological drought changes in China

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Atmospheric and Oceanic Science Letters 2018年第1期11卷 78-85页

作者： WANG Ai-Hui Xubin ZENG Nansen-Zhu International Research Centre Institute of Atmospheric Physics Chinese Academy of Sciences Beijing China Department of Hydrology and Atmospheric Sciences University of Arizona Tucson AZ USA

Drought is one of the extreme events that can be caused by internal climate variability （ICV） and external forcing （EF）. Here, the authors investigate the relative contributions of ICY and EF to meteorological drought changes in China using 40 members from the Community Earth System Model Large Ensemble （CESE_LE） project for historical simulations （in response to greenhouse gases and other EF） and future simulations under the RCP8.5 scenario. The authors use the Standardized Precipitation Index （SPI） to represent meteorological drought, and then define and analyze four drought parameters （frequency, severity, duration, and maximum duration） over eight regions of China. For historical periods, the ICV plays a dominant role in drought variation, while with global warming under the RCP8.5 scenario the EF becomes the prominent factor for drought characteristics. With the global warming signal, the effect of ICV varies with the drought parameters. This study suggests that the ICV should be taken into account when climate model simulations are used to investigate drought--in particular, for historical periods.

关键词： Drought SPI CESM_LE internal climate variability external forcing