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2002:The extra-strong warm winter event in North Asia and its accompanying anomalous atmospheric circulation

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chinese Science Bulletin 2003年第10期48卷 1031-1033页

作者： WANG Huijun lasg, institute of atmospheric physics, chinese academy of Sciences,{4., china lasg Institute of Atmospheric Physics Chinese Academy of Science China

Features of an extra-strong warm winter event in North Asia in 2002 and its accompanying anomalous atmospheric circulation were studied through diagnosis on the atmospheric reanalysis data set. Results show that the winter of 2002 is of the warmest in the recent 54.years in North Asia, which was caused by both decadal scale and interannual scale variability. The interannual variability is proved to be as the main cause for the event, and it is related to the global scale atmospheric circulation anomalies, with the strongest of them in the Eastern Hemisphere and in the middle and high latitude region of the Southern Hemisphere.

关键词：大气环流亚洲北部高强度暖冬现象天气资料

The mechanism of the effects of the upwelling mean on the ENSO event mature phase locking

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Science china Earth Sciences 2007年第8期50卷 1266-1272页

作者： YAN BangLiang CMSR, institute of atmospheric physics, chinese academy of Sciences, beijing 100029,{4. CMSR Institute of Atmospheric Physics Chinese Academy of Sciences Beijing China

The mechanism of the effects of the upwelling mean on the ENSO event mature phase locking is ex-amined by using a mixed-mode model. The results show that the positive feedback process of the ef-fects of the seasonal variation of the upwelling mean on the Kelvin wave is the mechanism of the locking of the event mature phase to the end of the calendar year. The memory of the Rossby waves for the sign-shifting of the sea surface temperature anomaly from positive to negative 6 months before the cold peak time is the other mechanism of the locking of the La Nia event mature phase to the end of the calendar year. The results here are different from previous ones which suggest that the balance between cold and warm trends of sea surface temperature anomaly is the mechanism involved. The cold trend is caused by the upwelling Kelvin wave from upwelling Rossby wave reflected at the western boundary, excited by the westerly anomaly stress over the central Pacific and amplified by the seasonal variation of the coupled strength in its way propagating westward. The warm trend is caused by the Kelvin wave forced by the western wind stress over the middle and eastern equatorial Pacific. The cause of the differences is due to the opposite phase of the seasonal variation of the upwelling mean to that in the observation and an improper parameterization scheme for the effects of the seasonal varia-tion of the upwelling mean on the ENSO cycle in previous studies.

关键词： Kelvin wave Rossby wave interaction between atmosphere and sea positive feedback

Construction and numerical tests of the multi-conservation difference scheme

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chinese Science Bulletin 2003年第10期48卷 1016-1020页

作者： WANG Bin & JI Zhongzhen lasg, institute of atmospheric physics, chinese academy of Sciences,{4., china lasg Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029 China

A difference scheme with four conservation properties for solving the spherical barotropic shallow water equations is constructed, based on a proper formulae of the equations and a skillful correction on the spatial difference parts of the semi-discrete equations with which the number of the conservation properties of these equations is increased from three to four. Numerical tests are included, and good results are achieved in this study.

关键词：多态守恒差分图解法动力系统正压浅水波方程大气系统数字模型

A new approach to studying ENSO predictability:Conditional nonlinear optimal perturbation

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chinese Science Bulletin 2003年第10期48卷 1045-1047页

作者： MU Mu & DUAN Wansuo lasg, institute of atmospheric physics, chinese academy of Sciences,{4., china lasg Institute of Atmospheric Physics Chinese Academy of Sciences

A new approach, the conditional nonlinear optimal perturbation (CNOP) is introduced to study the predictability of El Ni駉-Southern Oscillation (ENSO) using a theoretical coupled ocean-atmosphere model. The differences between CNOP and linear singular vector (LSV) are demonstrated. The results suggest that the nonlinear model and CNOP are superior in determining error growth for studying predictability of the ENSO. In particular, the CNOP approach is used to explore the nature of the 憇pring predictability barrier?in ENSO prediction.

关键词：研究方法非线性最优混乱条件天气预报 ENSO模型海洋大气模型

Multi-spatial variability modes of the Atlantic Meridional Overturning Circulation

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chinese Science Bulletin 2003年第S2期48卷 30-35页

作者： ZHOU Tianjun lasg, institute of atmospheric physics. chinese academy of Sciences,{4.. china chinese Acad Sci Inst Atmospher Phys LASG Beijing 100029 Peoples R China

The multi-spatial variability modes of the At-lantic Meridional Overturning Circulation (MOO are iden-tified in the natural coupled simulation of two climate models,the MOC either oscillates at decadal scales with strong cross-equatorial flow or fluctuates locally at interannual scaleswith weaker cross-equatorial flow. Former studies mainlyemphasize the paleo-environmental and paleo-climatic im-pacts of the meridional overturning states transition; thisanalysis indicates the existence of the multi-spatial variabilitymodes of the MOC at interannual to decadal scales. Furtheranalysis indicates that the conventionally used MOC index,which is defined as the maximum zonal mean meridionalstream-function of the North Atlantic, cannot properly de-scribe the multi-spatial variability characteristics of theMOC.

关键词： Atlantic Meridional Overturning Circulation basin scale local scale.

The relationship between short-range motion of atmosphere and ocean and conservative and nonconservative scheme

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Science Bulletin 2003年第10期48卷 999-1001页

作者： LIN Wantao, JI Zhongzhen & WANG Bin lasg,institute of atmospheric physics, {4. academy of Sciences, beijing 100029, china lasg Institute of Atmospheric Physics Chinese Academy of Sciences China

Taking one-dimensional shallow water wave equation as an example, a comparative analysis on the computational stability related to the short-range motion of atmosphere and ocean is carried out for the conservative and nonconservative scheme, and it is pointed out that the computational stability of conservative scheme is absolutely different from that of the nonconservative scheme. The relationship between the short-range motion of atmosphere and ocean and the conservative and nonconservative scheme is further discussed. The constructed conservative scheme is proved to be stable by the numerical experiment for the short-range motion of atmosphere and ocean while the CTCS scheme is unstable. So that the conservative scheme for the solution of this kind of problem has more advantages.

关键词： short-range motion of atmosphere and ocean conservative scheme nonconservative scheme computational stability.

Numerical simulation of the sensitivity of the Pacific subtropical-tropical meridional cell to global warming

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Progress in Natural Science:Materials International 2006年第5期16卷 507-511页

作者： ZHOU Tianjun, YU Yongqiang, LIU Hailong, LI Wei and YU Rucong (lasg, institute of atmospheric physics, chinese academy of Sciences,{4., china) lasg Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029 China

Sensitivity of the Pacific subtropical-tropical meridional cell to global warming is examined by using a global ocean-atmosphere coupled model developed at lasg/IAP. Results indicate that associated with the increasing of atmospheric carbon dioxide, the most prominent signals of global warming locate at high latitudes, and the change of middle and low latitudes, in particular the surface wind, is relatively weak, which leads to a weak response of the Pacific subtropical-tropical meridional cell. At the time of atmospheric carbon dioxide doubling, the change of the meridional cell strength is smaller than the amplitude of natural variability.

关键词： Pacific subtropical-tropical meridional cell global warming ocean-atmosphere coupled model.

An improved δ-Eddington approximation

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chinese Science Bulletin 1999年第4期44卷 304-309页

作者： QIU Jinhuaninstitute of atmospheric physics , chinese {4. of Sciences , beijing 100029, china institute of atmospheric physics Chinese Academy of Sciences Beijing China

Based on an accuracy analysis of two-stream approximations, an improved δ-Eddington ap-proximation is developed. The approximation has much better accuracy than all exiting two-stream ap-proximations as the optical depth is less than unity. As the surface reflectance is zero and the opticaldepth is less than unity, errors in both transmission and reflection calculated by the present approxima-tion are more one time less than those by other two-stream approximations. In the case of aerosol opti-cal depth of4.% and one times lessthan those by Eddington or δ-Eddington.

关键词： radiation flux fractional factor of δ-function Eddington approximation.

Prediction model for spring dust weather frequency in North china

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Science china Earth Sciences 2008年第5期51卷 709-720页

作者： LANG XianMei Center for Disastrous Climate Research and Prediction, institute of atmospheric physics, chinese academy of Sciences, beijing 100029,{4. Center for Disastrous Climate Research and Prediction Institute of Atmospheric Physics Chinese Academy of Sciences Beijing China

It is of great social and scientific importance and also very difficult to make reliable prediction for dust weather frequency (DWF) in North china. In this paper, the correlation between spring DWF in beijing and Tianjin observation stations, taken as examples in North china, and seasonally averaged surface air temperature, precipitation, Arctic Oscillation, Antarctic Oscillation, South Oscillation, near surface meridional wind and Eurasian westerly index is respectively calculated so as to construct a prediction model for spring DWF in North china by using these climatic factors. Two prediction models, i.e. model-I and model-II, are then set up respectively based on observed climate data and the 32-year (1970 -2001) extra-seasonal hindcast experiment data as reproduced by the nine-level {4. General Circulation Model developed at the institute of atmospheric physics (IAP9L-AGCM). It is indicated that the correlation coefficient between the observed and predicted DWF reaches 0.933 in the model-I, suggesting a high prediction skill one season ahead. The corresponding value is high up to 0.94. for the subsequent model-II, which involves synchronous spring climate data reproduced by the IAP9L-AGCM relative to the model-I. The model-II can not only make more precise prediction but also can bring forward the lead time of real-time prediction from the model-I’s one season to half year. At last, the real-time predictability of the two models is evaluated. It follows that both the models display high prediction skill for both the interannual variation and linear trend of spring DWF in North china, and each is also featured by different advantages. As for the model-II, the prediction skill is much higher than that of original approach by use of the IAP9L-AGCM alone. Therefore, the prediction idea put forward here should be popularized in other regions in china where dust weather occurs frequently.

关键词： spring dust weather frequency prediction model iap9l-agcm hindcast experiment real-time prediction