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Sensitivity of simulated tropical intraseasonal oscillations to cumulus schemes

Science China Earth Sciences 2011年第11期54卷 1761-1771页

作者： HU WenTing DUAN AnMin WU GuoXiong LASG Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029 China Graduate University of Chinese Academy of Sciences Beijing 100049 China

The sensitivity of simulated tropical intraseasonal oscillations (ISO) to different cumulus parameterization schemes was analyzed using an atmospheric general circulation model (latest version-SAMIL2.2.3) developed at the Laboratory for Numerical modeling for atmospheric Sciences and Geophysical Fluid Dynamics (LASG) at the Institute of atmospheric Physics (IAP) of the Chinese Academy of *** show that the basic features of tropical climatological intraseasonal oscillations (CISO) can be captured using all three cumulus *** CISO simulated by the Tiedtke scheme was found to be more realistic than that of the Manabe and Zhang-McFarlane *** results of simulated transient intraseasonal oscillations (TISO) indicate that although the Tiedtke and the Zhang-McFarlane schemes in the new version SAMIL2.2.3 have been adjusted according to different problems,only the latter can simulate the eastward propagation of the 27-50-day TISO *** may be associated with the more realistic diabatic heating profile simulated by the Zhang-McFarlane *** addition,the Manabe scheme in SAMIL2.2.3 is the same as that in the prior version ***,some aspects of the physical process,such as the radiation scheme and aerosol condition,have been *** the eastward propagation from 100°E to the west of the tropical 27-50-day TISO mode only can be simulated using the Manabe scheme of SAMIL ***,not all the improvements of physical parameterization schemes work well in every *** coordinated developments between dynamic frame and physical processes,and among different physical processes,are important methods that may be used to improve the model.

关键词： cumulus parameterization scheme intraseasonal oscillation atmospheric general circulation model diabatic heatingprofile

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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 1979-2003. 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 Study on Sulfate Optical Properties and Direct Radiative Forcing Using LASG-IAP general circulation model

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Advances in atmospheric Sciences 2012年第6期29卷 1185-1199页

作者：李剑东孙治安刘屹岷李江南王维强吴国雄 State Key Laboratory of Numerical modeling for atmospheric Sciences and Geophysical Fluid Dynamics Institute of Atmospheric PhysicsChinese Academy of Sciences atmospheric Sciences Research Center State University of New YorkAlbanyNew YorkUSA 12203 Center for Australian Weather and Climate Research Australian Bureau of MeteorologyMelbourneVictoriaAustralia Canadian Center for Climate modeling and Analysis University of VictoriaVictoriaBritish ColumbiaCanada

The direct radiative forcing （DRF） of sulfate aerosols depends highly on the atmospheric sulfate loading and the meteorology, both of which undergo strong regional and seasonal variations. Because the optical properties of sulfate aerosols are also sensitive to atmospheric relative humidity, in this study we first examine the scheme for optical properties that considers hydroscopic growth. Next, we investigate the seasonal and regional distributions of sulfate DRF using the sulfate loading simulated from NCAR CAM-Chem together with the meteorology modeled from a spectral atmospheric general circulation model （AGCM） developed by LASG-IAP. The global annual-mean sulfate loading of 3.44 mg m-2 is calculated to yield the DRF of -1.03 and -0.57 W m-2 for clear-sky and all-sky conditions, respectively. However, much larger values occur on regional bases. For example, the maximum all-sky sulfate DRF over Europe, East Asia, and North America can be up to -4.0 W m-2. The strongest all-sky sulfate DRF occurs in the Northern Hemispheric July, with a hemispheric average of -1.26 W m-2. The study results also indicate that the regional DRF are strongly affected by cloud and relative humidity, which vary considerably among the regions during different seasons. This certainly raises the issue that the biases in model-sinmlated regional meteorology can introduce biases into the sulfate DRF. Hence, the model processes associated with atmospheric humidity and cloud physics should be modified in great depth to improve the simulations of the LASG-IAP AGCM and to reduce the uncertainty of sulfate direct effects on global and regional climate in these simulations.

关键词： sulfate optical properties direct radiative forcing atmospheric general circulation model

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The Observed and Simulated Major Summer Climate Features in Northwest China and Their Sensitivity to Land Surface Processes

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Journal of Meteorological Research 2014年第5期28卷 836-848页

作者：李倩薛永康 Center for Monsoon System Research Institute of Atmospheric PhysicsChinese Academy of Sciences Department of Geography University of CaliforniaLos AngelesCA 90095-1524USA Department of atmospheric and Oceanic Sciences University of CaliforniaLos AngelesCA 90095-1524USA

Northwest China （NWC） is a typical arid and semi-arid region. In this study, the main summer climate features over NWC are presented and the performance of an atmospheric general circulation model （NCEP GCM/SSiB） over this region is evaluated. Satellite-derived vegetation products are applied in the model. Based on comparison with observational data and Reanalysis II data, the model generally captures major features of the NWC summer energy balance and circulation. These features include： a high surface tem- perature center dominating the planetary boundary layer; widespread descending motion; an anticyclone （cyclone） located in the lower and middle （upper） troposphere, covering most parts of central NWC; and the precipitation located mainly in the high elevation areas surrounding NWC. The sensitivity of the summer energy balance and circulation over NWC and surrounding regions to land surface processes is assessed with specified land cover change. In the sensitivity experiment, the degradation over most parts of NWC, except the Taklimakan desert, decreases the surface-absorbed radiation and leads to weaker surface thermal effects. In northern Xinjiang and surrounding regions, less latent heating causes stronger anomalous lower-level anticyclonic circulation and upper-level cyclonic circulation, leading to less summer precipitation and higher surface temperature. Meanwhile, the dry conditions in the Hexi Corridor produce less change in the latent heat flux. The circulation change to the north of this area plays a domi- nant role in indirectly changing lower-level cyclonic conditions, producing more convergence, weaker vertical descending motion, and thus an increase in the precipitation over this region.

关键词： Northwest China (NWC) arid and semi-arid regions atmospheric general circulation model land cover change land surface processes

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Polar Vortex Response to Pacific Ocean Warming and Its Additive Nonlinearity with the Indian Ocean

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atmospheric and Oceanic Science Letters 2010年第6期3卷 303-307页

作者： LI Shuanglin Nansen-Zhu International Research Centre and Key Laboratory of Regional Climate-Environment for East Asia Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029 China

A previous modeling study about Pacific Ocean warming derived polar vortex response signals, by subtracting those in the Indian Ocean warming experiments from those in the Indo-Pacific. This approach questions the resemblance of such an indirectly derived response to one directly forced by Pacific Ocean warming. This is relevant to the additive nonlinearity of atmospheric responses to separated Indian and Pacific Ocean forcing. In the present study, an additional set of ensemble experiments are performed by prescribing isolated SST forcing in the tropical Pacific Ocean to address this issue. The results suggest a qualitative resemblance between responses in the derived and additional experiments. Thus, previous findings about the impact of Indian and Pacific Ocean wanning are robust. This study has important implications for future climate change projections, considering the non-unanimous warming rates in tropical oceans in the 21st century. Nevertheless, a comparison of present direct-forced experiments with previous indirect-forced experiments suggests a significant additive nonlinearity between the Indian and Pacific Ocean warmings. Further diagnosis suggests that the nonlinearity may originate from the thermodynamic processes over the tropics.

关键词： tropical Pacific Ocean warming northern and southern polar vortex atmospheric general circulation model additive nonlinearity

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Effects of Nested Area Size upon Regional Climate model Simulations

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Advances in atmospheric Sciences 2002年第1期19卷 111-120页

作者：刘华强钱永甫郑益群 Laboratory for Meteorological Disastersand Environmental Change Nanjing Institute of Meteorology Nanjing 210044 Department of atmospheric Sciences Nanjing University Nanjing 210093 Nanjing Institute of Geography and Limnology Chinese Academy of Sciences Nanjing 210008

This paper presents a numerical study on the 1998 summer rainfall over the Yangtze River valley in central and eastern China, addressing effect of a nested area size on simulations in terms of the technique of nesting a regional climate model (RCM) upon a general circulation model (GCM). Evidence suggests that the size exerts greater impacts upon regional climate of the country, revealing that a larger nested size is superior to a small one for simulation in mitigating errors of GCM-provided lateral boundary forcing. Also, simulations show that the RCM should incorporate regions of climate systems of great importance into study and a low-resolution GCM yields more pronounced errors as a rule when used in the research of the Tibetan Plateau, and, in contrast, our PσRCM can do a good job in describing the plateau’s role in a more realistic and accurate way. It is for this reason that the tableland should be included in the nested area when the RCM is employed to investigate the regional climate. Our PσRCM nesting upon a GCM reaches more realistic results compared to a single GCM used.

关键词： Regional climate model atmospheric general circulation model Nesting

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