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Convection-Permitting Simulations of Current and Future Climates over the Tibetan Plateau

Advances in Atmospheric Sciences 2024年第10期41卷 1901-1916页

作者： Liwei ZOU Tianjun ZHOU lasg Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China

The Tibetan Plateau(TP)region,also known as the“Asian water tower”,provides a vital water resource for downstream *** studies of water cycle changes over the TP have been conducted with climate models of coarse resolution in which deep convection must be *** this study,we present results from a first set of highresolution climate change simulations that permit convection at approximately 3.3-km grid spacing,with a focus on the TP,using the Icosahedral Nonhydrostatic Weather and Climate Model(ICON).Two 1.-year simulations were performed,consisting of a retrospective simulation(2008–20)with initial and boundary conditions from ERA5 reanalysis and a pseudoglobal warming projection driven by modified reanalysis-derived initial and boundary conditions by adding the monthly CMIP6 ensemble-mean climate change under the SSP5-8.5 *** retrospective simulation shows overall good performance in capturing the seasonal precipitation and surface air *** the central and eastern TP,the average biases in precipitation(temperature)are less than−0.34 mm d−1.−1.1.)throughout the *** simulated biases over the TP are ***(wet)biases are found in summer(winter)above 5500 *** future climate simulation suggests that the TP will be wetter and warmer under the SSP5-8.5 *** general features of projected changes in ICON are comparable to the CMIP6 ensemble projection,but the added value from kilometer-scale modeling is evident in both precipitation and temperature projections over complex topographic *** ICON-downscaled climate change simulations provide a high-resolution dataset to the community for the study of regional climate changes and impacts over the TP.

关键词： dynamical downscaling convection-permitting Tibetan Plateau pseudo-global warming

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The Persistence and Zonal Scale of Atmospheric Dipolar Modes

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Advances in Atmospheric Sciences 2024年第3期41卷 478-492页

作者： Jie SONG State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics(lasg) Institute of Atmospheric Physics(IAP)Chinese Academy of SciencesBeijing 100029China

This study investigates the relationship between the persistence and the zonal scale of atmospheric dipolar modes(DMs). Results from the daily data of ERA5 and the long-term output of an idealized atmospheric model show that the atmospheric DMs with a broader(narrower) zonal scale dipolar structure possess a longer(shorter) persistence. A detailed vorticity budget analysis indicates that the persistence of a hemispheric-scale DM(1.1.DM) and a regional or sectoral DM(1.8 DM) in the model both largely rely on the persistence of the nonlinear eddy forcing. Linear terms can indirectly reduce the persistence of the anomalous nonlinear eddy forcing in a 1.8 DM by modifying the baroclinicity via the arousal of anomalous vertical motions. Therefore, the atmospheric DMs with a broader(narrower) zonal scale possess a longer(shorter) persistence because the effects of the linear terms are less(more) pronounced when the atmospheric DMs have better(worse) zonal symmetry. Further analyses show that the positive eddy feedback effect is weak or even absent in a 1.8DM and the high-frequency eddy forcing acts more like a concomitant phenomenon rather than a leading driving factor for a 1.8 DM. Thus, the hemispheric-scale DM and the regional or sectoral DMs are different, not only in their persistence but also in their dynamics.

关键词： NAM NAO eddy feedback persistence linear term

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Numerical simulations of Atlantic meridional overturning circulation(AMOC)from OMIP experiments and its sensitivity to surface forcing

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Journal of Oceanology and Limnology 2024年第2期42卷 454-467页

作者： Xiaowei WANG Yongqiang YU State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics(lasg) Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China University of Chinese Academy of Sciences Beijing 100049China

Atlantic meridional overturning circulation(AMOC)plays an important role in transporting heat meridionally in the Earth’s climate system and is also a key metrical tool to verify oceanic general circulation *** OMIP(Ocean Model Intercomparison Project phase 1.and 2)simulations with LICOM3(version 3 of the lasg/IAP Climate System Ocean Model)developed at the State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics(lasg),Institute of Atmospheric Physics(IAP),are compared in this *** simulations well reproduce the fundamental characteristics of the AMOC,but the OMIP1.simulation shows a significantly stronger AMOC than the OMIP2 *** the LICOM3 configurations are identical between these two experiments,any differences between them must be attributed to the surface forcing *** analysis suggests that sea surface salinity(SSS)differences should be mainly responsible for the enhanced AMOC in the OMIP1.simulation,but sea surface temperature(SST)also play an unignorable role in modulating *** the North Atlantic,where deep convection occurs,the SSS in OMIP1.is more saline than that in *** find that in the major region of deep convection,the change of SSS has more significant effect on density than the change of *** a result,the SSS was more saline than that in OMIP2,leading to stronger deep convection and subsequently intensify the *** conduct a series of numerical experiments with LICOM3,and the results confirmed that the changes in SSS have more significant effect on the strength of AMOC than the changes in SST.

关键词： oceanic general circulation model(OGCM) Atlantic meridional overturning(AMOC) surface forcing deep convection

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THE RESPONSES OF THE THIRD GENERATION OF IAP/lasg OCEANIC GCM TO DIFFERENT EXTERNAL FORCING

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Journal of Hydrodynamics 2001年第3期13卷 107-114页

作者： Li Wei, Liu Hai long, Zhang Xue hong lasg Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 1.0029, China Fang Guo hong Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071. China Key Laboratory of Marine Scienc lasg Inst. of Atmospheric Physics Chinese Acad. of Sci. Beijing 100029 China

Forced by different wind stress as well as different surface heat flux, three 1. year integrations using L30T63 oceanic GCM are carried out. The annual mean state, seasonal cycle and interannual variability of the upper ocean temperature over the tropical Pacific are examined. In the case of annual mean state of sea surface temperature, relults from D1.c and D1.e are alike and have good agreement with NCEP data. Defects in D1.d include the excessively higher SST over warm pool region and higher SST along the eastern coast. The corresponding westward displacement of cold water is also noticeable. All the experiments represent the annual cycle of SST in the eastern equatorial Pacific while the amplitudes are weaker compared to NCEP data. The intensity of interannual variability of SST in eastern equatorial Pacific is markedly improved D1.d and is perfectly comparative with that from NCEP data. The eastward propagations of the interannual variability of upper ocean heat content along the equator in 1.82/1.83 E1.Nio are well represented in all experiments. On the onset stage of 1.82/1.83 E1.Nio, the modeled interannual variabilities of SST and heat content are generally the same among all experiments. It is the weakest interannual variability of surface heat flux, which damps SST variability during the mature phase of E1.Nio, that results in a most intensified SST variability in D1.d.

关键词： Oceanic GCM tropical pacific SST

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Prediction of the Asian-Australian Monsoon Interannual Variations with the Grid-Point Atmospheric Model of IAP lasg(GAMIL)

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Advances in Atmospheric Sciences 2008年第3期25卷 387-394页

作者：吴志伟李建平 State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics(lasg) Institute of Atmospheric Physics(IAP) State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics(lasg) Institute of Atmospheric Physics(IAP)Chinese Academy of Sciences100029

Seasonal prediction of Asian-Australian monsoon （A-AM） precipitation is one of the most important and challenging tasks in climate prediction. In this paper, we evaluate the performance of Grid Atmospheric Model of IAP lasg （GAMIL） on retrospective prediction of the A-AM interannual variation （IAV）, and determine to what extent GAMIL can capture the two major observed modes of A-AM rainfall IAV for the period 1.79-2003. The first mode is associated with the turnabout of warming （cooling） in the Nifio 3.4 region, whereas the second mode leads the warming/cooling by about one year, signaling precursory conditions for ENSO. We show that the GAMIL one-month lead prediction of the seasonal precipitation anomalies is primarily able to capture major features of the two observed leading modes of the IAV, with the first mode better predicted than the second. It also depicts the relationship between the first mode and ENSO rather well. On the other hand, the GAMIL has deficiencies in capturing the relationship between the second mode and ENSO. We conclude：（1. successful reproduction of the E1.Nifio-excited monsoon-ocean interaction and E1.Nifio forcing may be critical for the seasonal prediction of the A-AM rainfall IAV with the GAMIL; （2） more efforts are needed to improve the simulation not only in the Nifio 3.4 region but also in the joining area of Asia and the Indian-Pacific Ocean; （3） the selection of a one-tier system may improve the ultimate prediction of the A-AM rainfall IAV. These results offer some references for improvement of the GAMIL and associated seasonal prediction skill.

关键词： Asian-Australian monsoon interannual variation ENSO atmospheric general circulation model GAMIL

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A Further Inquiry on the Mechanism of 30-60 Day Oscillation in the Tropical Atmosphere

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Advances in Atmospheric Sciences 1993年第1期10卷 41-53页

作者：李崇银 1. lasg Institute of Atmospheric Physics Chinese Academy of Sciences 100080 Beijing

In a simple semi-geostropic model on the equatorial β-plane, the theoretical analysis on the 30-60 day oscillation in the tropical atmosphere is further discussed based on the wave-CISK mechanism. The convection heating can excite the CISK-Kelvm wave and CISK-Rossby wave in the tropical atmosphere and they are all the low-frequency modes which drive the activities of 30-60 day oscillation in the tropics. The most favorable conditions to excite the CISK-Kelvin wave and CISK-Rossby wave are indicated: There is convection heating but not very strong in the atmosphere and there is weaker disturbance in the lower *** influences of vertical shearing of basic flow in the troposphere on the 30-60 day oscillation in the tropics are also discussed.

关键词： A Further Inquiry on the Mechanism of 30-60 Day Oscillation in the Tropical Atmosphere

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A Sensitivity Study of IAP AGCM to Radiation Changes: Climate Simulation of 1.5kyr and 1.5kyr before Present

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Advances in Atmospheric Sciences 1993年第2期10卷 227-232页

作者：王会军 1. lasg Institute of Atmospharic Physics Chinese Academy of Sciences 100080 Beijing

The IAP AGCM was used to simulate the climate of 1.5kyr and 1.5kyr before present. We analysed the results and then studied the sensitivity of the model to the changes of radiation distribution induced by orbital para... 详细信息

关键词： A Sensitivity Study of IAP AGCM to Radiation Changes Climate Simulation of 1.5kyr and 1.5kyr before Present IAP

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Modelling the January and July Climate of 9000 Years before Present

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Advances in Atmospheric Sciences 1994年第3期11卷 319-326页

作者：王会军 1. lasg Institute of Atmospheric Physics Chinese Academy of Sciences 100080 Beijing

The January and July climate of 9000 years before present was simulated through a set of perpetual experimentsby means of the newly designed 9 Level Atmospheric General Circulation Model (AGCM) in the institute of Atmospheric Physics (IAP). The results were analysed and compared with previous results simulated by the IAP 2Level AGCM. There exists good agreement between them. It is found that the temperature is higher in July and lower inJanuary in 9000 yBP than that at present. The temperature difference is more obvious in the Northern Hemispherethan in the Southern Hemisphere and greater in July than in January. These results prove the potential abilities of theg-L AGCM in the climate simulation and climate prediction.

关键词： Paleoclimate Modelling. Climate Change Atmospheric General Circulation Models

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A GCM Study on the Mechanism of Seasonal Abrupt Changes

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Advances in Atmospheric Sciences 1994年第1期11卷 51-56页

作者：王会军曾庆存 1. Institute of Atmospheric Physics Chinese Academy of Sciences LASG 100080 Beijing

In this paper the observational studies and some related dynamical and numerical researches on seasonal abrupt changes were reviewed first. Then a speculation that the seasonal variation of insolation and the nonlinear dynamic interaction account for the abrupt changes was put forward and was asserted by a set of GCM sensitivity experiments. The results show that the abrupt changes would exist in case that all the earth surface was grass land and there was no topography. However, many factors may have influences on the abrupt changes. Hence this phenomenon is quite complicated and needs further investigations.

关键词： Abrupt change GCMs Sensitivity experiments

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Modelling　the　Interannual　Variation　of　Regional　Precipitation　over　China

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Advances in Atmospheric Sciences 1994年第2期11卷 230-238页

作者：王会军 1. Chinese Academy of Sciences LASG Institute of Atmospheric Physics 100080 Beijing

The interannual change of regional precipitation over China during 1.79-1.88, simulated by the IAP 2-LAGCM (the atmospheric general circulation model) developed in the Institute of Atmospheric Physics and by using the observational monthly sea surface temperature (SST) and sea ice occupations, was analysed and compared with that of observation. Results show that the abilities of the model to simulate the interannual variabilities of precipitation are different from one region to another in China. Studies indicate that the regional precipitation interannual variation which is correlated to the strong sign of sea surface temperature anomalies (SSTA) coUld be simulated well by the model, strong SSTA is important for the seasonal and extra-seasonal climate predictions through climate *** results also suggest that the horizontal resolution of the model should be more refined in order to give better rep resentations of regional details.

关键词： Interannual variability Correlation Numerical climate prediction

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