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中国气象学会2.08年年会大气环境监测、预报与污染物控制分会场

作者： xu yue1,2. huijun wang1,{2., institute of atmospheric physics, chinese academy of sciences, beijing, China. 2.raduate school of the chinese academy of sciences, beijing, China.

A new global three-dimensional transport model of mineral dust aerosols is developed and evaluated. The dust model is embedded in a general circulation model with conservative dynamical core and unique consideration of the polar transportation, which make the model stable in simulations. Comprehensive parameterizations of the emission and deposition processes from wang et al. [2.00] are modified to match the surface conditions and meteorological fields of the climate model. A 2.-year simulation from the dust model gives an estimation of dust mobilization of 1974 ± 30 Tg yr-1 and a global dust burden of about 2. Tg for the particles smaller than 10 μm. The vertical distribution, temporal variation on different time scales and surface concentration of the simulated mineral dust aerosols are compared with both observations and simulations from other models. The evaluation results show that the new dust model has the ability to reproduce the principal features of global dust transportation. The main deficiency of the model is the underestimation of the dust activity in East Asia during spring and the overestimation of the concentration in Central Pacific, which have also been reported by other model simulations. The global mean optical thickness of dust at 0.63 μm is 0.02. ± 0.004 in the model, which is comparable to the magnitude of sulphate aerosols. Such result indicates that both anthropogenic and natural sources need to be considered when evaluating the climate feedback of aerosols.

关键词： mineral dust aerosols, transport model, emission and deposition, optical thickness

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Springtime Convective Quasi-Biweekly Oscillation and Interannual Variation of Its Intensity over the South China Sea and Western North Pacific

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Journal of Meteorological research 2019年第2期33卷 323-335页

作者： Zhiqing xu ke fan {2. wang nansen–zhu {2. research Centre Institute of Atmospheric Physics Chinese Academy of Sciences Climate Change research center Chinese Academy of Sciences University of the chinese academy of sciences Collaborative Innovation center on Forecast and Evaluation of Meteorological Disasters Nanjing University of Information Science &Technology

This study investigates characteristics of the convective quasi-biweekly oscillation(QBWO) over the South China Sea(SCS) and western North Pacific(WNP) in spring, and the interannual variation of its intensity. Convective QBWO over the WNP and SCS shows both similarities and differences. Convective QBWO over the WNP originates mainly from southeast of the Philippine Sea and propagates northwestward. In contrast, convective QBWO over the SCS can be traced mainly to east of the Philippines and features a westward propagation. Such a westward or northwestward propagation is probably related to n = 1 equatorial Rossby waves. During the evolution of convective QBWO over the WNP and SCS, the vertical motion and specific humidity exhibit a barotropic structure and the vertical relative vorticity shows a baroclinic structure in the troposphere. The dominant mode of interannual variation of convective QBWO intensity over the SCS–WNP region in spring is homogeneous. Its positive phase indicates enhanced convective QBWO intensity accompanied by local enhanced QBWO intensity of vertical motion throughout the troposphere as well as local enhanced(weakened) QBWO intensity of kinetic energy, vertical relative vorticity,and wind in the lower(upper) troposphere. The positive phase usually results from local increases of the background moisture and anomalous vertical shear of easterlies. The latter contributes to the relationship between the dominant mode and QBWO intensities of kinetic energy, vertical relative vorticity, and wind. Finally, a connection between the dominant mode and the sea surface temperature anomalies in the tropical Pacific Ocean is demonstrated.

关键词： convective quasi-biweekly oscillation interannual variation South China Sea western North Pacific spring

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Projected changes in summer water vapor transport over East Asia under the 1.5°C and 2.0°C global warming targets

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atmospheric and Oceanic Science Letters 2019年第2期12卷 124-130页

作者： xu Zhiqing fan ke nansen-zhu {2. research Centre Institute of Atmospheric PhysicsChinese Academy of Sciences Climate Change research center Chinese Academy of Sciences College of Earth and Planetary sciences University of the Chinese Academy of Sciences

This study investigates changes in summer water vapor transport(WVT) over East Asia under 1.5°C and 2.0°C global warming(GW) for the +4.5 and +8.5 W m-2.Representative Concentration Pathway(RCP) scenarios(RCP4.5 and RCP8.5, respectively). Of the 2. models used, 18 show better skill in simulating the climatological summer WVT over East Asia of the present day. Of those 18, 13 reach 1.5°C and 2.0°C GW for the two RCPs. Based on these 13 models, results show that — relative to the present day-th e summer WVT is enhanced over East Asia under 1.5°C and 2.0°C GW for RCP4.5 and RCP8.5. The inte r-model consistency is higher under 2.0°C GW. Increased water vapor content favors the enhanced WVT over both southern and northern East Asia, while lower-level circulation contributes to the enhanced WVT over southern East Asia. Compared to 1.5°C GW, th e summer WVT under 2.0°C GW is further enhanced over most of East Asia for RCP4.5. For RCP8.5, the summer WVT is also further enhanced over southern East Asia, while this is not the case over northern East Asia. Under the additional 0.5°C GW, the changes in summer WVT, with low in ter-model consistency, are closely related to anomalous lower-level circulation. Precipitation increases over the East China Sea to southern Japan, the Korean Peninsula, and North China, for both RCP4.5 and RCP8.5. However, the changes in precipitation over the South China Sea and Northeast China are different for the two RCPs. This is connected to the difference in the changes of WVT divergence.

关键词： Water vapor transport East Asia 1.5°C and 2.0°C global warming RCP4.5 and RCP8.5

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Two different periods of high dust weather frequency in northern China

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atmospheric and Oceanic Science Letters 2016年第4期9卷 263-269页

作者： fan ke XIE Zhi-Ming xu Zhi-Qing nansen-zhu {2. research Centre Institute of Atmospheric PhysicsChinese Academy of SciencesBeijingChina Collaborative Innovation center on Forecast and Evaluation of Meteorological Disasters Nanjing University of Information Science&TechnologyNanjingChina University of the chinese academy of sciences BeijingChina Climate Change research center Chinese Academy of SciencesBeijingChina

This study reveals that, during the period 1966-2.14, dust weather frequency （DWF） in northern China （north of 30°N） features two high-DWF periods, in 1966-1979 （PI） and 2.00-2.14 （P2., when the linear trend of DWF is removed during the study period. Here, DWF denotes the number of days of dust weather events in the spring season （March-April-May）, including dust haze, blowing dust, and dust storms, which occurred in northern China. The results show that the DWF is much higher in PI than in P2. with increased DWF distributed over southern Xinjiang, the central part of northern China. The main cause is the SST difference in the Atlantic and Pacific between the two periods. It is also found that a meridional teleconnection over East Asia in PI and a zonal wave-like pattern over Eurasia in P2.at 2.0 hPa play a significant role in the interannual variability in the two periods, respectively. SST over the subtropical North Atlantic （extratropical SST between the Norwegian and Barents seas） may partly contribute to the upper-level meridional （zonal） teleconnection in PI （P2..

关键词： Dust weather frequency northern China meridionalteleconnection zonal wave-like pattern North AtlanticSST

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