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| 1 | 在EBEX-2000实验资料中湍流谱和局地各向同性特征显示文摘采用 2 0 0 0年 8月在美国加州棉花地两个高度上应用超声三分量仪、快速响应温度和湿度仪进行的EBEX 2 0 0 0(InternationalEnergyBalanceExperiment,2 0 0 0 ,EBEX 2 0 0 0 )风速三分量、温度和湿度湍流实验观测数据 ,计算分析了湍流速度、温度和湿度谱在不同稳定度下的特征。对湍流的局地各向同性进行了讨论并与Kansas和长白山原始森林湍流实验得到的结果进行了比较 ,得到了一些湍流特征量在不同下垫面情况下的一些有意义的特征。 | 刘树华 李洁 刘和平 梁福明 王建华 Johnny C.L.CHAN Andrew Y.S.CHENG 胡非 刘辉志 | 2005 | 大气科学2005，29，2： | 24 |
| 2 | 在EBEX-2000实验资料中的湍流宏观量特征显示文摘采用2000年8月在美国加州棉花地两个高度上应用超声三分量仪、快速响应温度和湿度仪进行的EBEX2000(InternationalEnergyBalanceExperiment,2000)风速三分量、温度和湿度湍流实验观测数据,计算分析了湍流宏观量(即u,T,σu/u,σv/u,σw/u和σT/T等),湍流动能和感热通量等的特征,并与其他湍流实验得到的结果进行了比较。 | 刘树华 李洁 刘和平 梁福明 王建华 Johnny C.L.CHAN Andrew Y.S.CHENG 胡非 刘辉志 | 2005 | 大气科学2005，29，4： | 11 |
| 3 | 在EBEX-2000实验资料中湍流耗散率、长度尺度和结构参数特征显示文摘采用2000年8月在美国加州棉花地两个高度上应用超声三分量仪、快速响应温度和湿度仪进行的EBEX2000(InternationalEnergyBalanceExperiment,2000,简称EBEX2000)风速三分量、温度和湿度湍流实验观测数据,计算分析了在不同稳定度下的湍流能量和热量耗散率和湍流结构参数特征。并与Kansas和长白山原始森林湍流实验得到的结果进行了比较,得到了一些湍流特征量在不同下垫面情况下的一些有意义的特征。 | 刘树华 刘和平 李洁 梁福明 王建华 Johnny C.L.CHAN AndrewY.S.CHENG 胡非 刘辉志 | 2005 | 大气科学2005，29，3： | 7 |
| 4 | Sensitivity of the Simulation of Tropical Cyclone Size to Microphysics Schemes显示文摘The sensitivity of the simulation of tropical cyclone(TC) size to microphysics schemes is studied using the Advanced Hurricane Weather Research and Forecasting Model(WRF). Six TCs during the 2013 western North Pacific typhoon season and three mainstream microphysics schemes–Ferrier(FER), WRF Single-Moment 5-class(WSM5) and WRF Single-Moment6-class(WSM6)–are investigated. The results consistently show that the simulated TC track is not sensitive to the choice of microphysics scheme in the early simulation, especially in the open ocean. However, the sensitivity is much greater for TC intensity and inner-core size. The TC intensity and size simulated using the WSM5 and WSM6 schemes are respectively higher and larger than those using the FER scheme in general, which likely results from more diabatic heating being generated outside the eyewall in rainbands. More diabatic heating in rainbands gives higher inflow in the lower troposphere and higher outflow in the upper troposphere, with higher upward motion outside the eyewall. The lower-tropospheric inflow would transport absolute angular momentum inward to spin up tangential wind predominantly near the eyewall, leading to the increment in TC intensity and size(the inner-core size, especially). In addition, the inclusion of graupel microphysics processes(as in WSM6) may not have a significant impact on the simulation of TC track, intensity and size. | Kelvin T.F.CHAN Johnny C.L.CHAN | 2016 | Advances in Atmospheric Sciences2016，33，9： | 4 |
| 5 | Sensitivity of precipitation statistics to urban growth in a subtropical coastal megacity cluster显示文摘This short paper presents an investigation on how human activities may or may not affect precipitation based on numerical simulations of precipitation in a benchmark case with modified lower boundary conditions, representing different stages of urban development in the model. The results indicate that certain degrees of urbanization affect the likelihood of heavy precipitation significantly, while less urbanized or smaller cities are much less prone to these effects. Such a result can be explained based on our previous work where the sensitivity of precipitation statistics to surface anthropogenic heat sources lies in the generation of buoyancy and turbulence in the planetary boundary layer and dissipation through triggering of convection. Thus only mega cities of sufficient size, and hence human-activity-related anthropogenic heat emission, can expect to experience such effects. In other words, as cities grow, their effects upon precipitation appear to grow as well. | Christopher Claus Holst Johnny C.L.Chan Chi-Yung Tam | 2017 | Journal of Environmental Sciences2017，29，9： | 3 |
| 6 | Structural Changes of a Tropical Cyclone during Landfall: β-plane Simulations显示文摘This study investigated the effects of landfall on the structure of a tropical cyclone (TC). Numerical simulations were performed using the Weather Research and Forecasting Model on a β-plane. Two landfall experiments, one with an east-west and another with a north-south oriented coastline, were performed. Similar to previous studies on an f-plane, large-scale flows in the low-to-middle troposphere were modified due to friction. A pair of counter rotating gyres was found, which was shown to be consistent with the slight deffection of the TC relative to the control experiment without land. Compared to previous f-plane simulations, because of the inherent asymmetries due to the β-gyres, the large-scale pattern of flows and convergences/divergences related to friction were found to depend on coastline orientations. On the other hand, regardless of the coastline orientation, convergences were found to be stronger to the left for both cases near landfall, as in previous f-plane simulations. Such a convergence pattern subsequently induced a change in convection and rainfall at the eyewall. | K.C.SZETO Johnny C.L.CHAN | 2010 | Advances in Atmospheric Sciences2010，27，5： | 3 |
| 7 | 建筑物对城市通风自净能力影响的数值试验(英文)显示文摘应用城市气候数值模式,分别计算了三栋6层住宅楼和一栋20层住宅楼两类建筑形式影响下的风场,以及在此凤场中街道汽车尾气的浓度分布。计算结果表明在总建筑面积基本相同的情况下,高层建筑周围环境的通风自净能力要优于多层建筑。 | 刘辉志 桑建国 张伯寅 Johnny C.L.Chan Andrew Y.S.CHENG 刘和平 | 2002 | Advances in Atmospheric Sciences2002，19，6： | 1 |
| 8 | Recent Decrease in the Difference in Tropical Cyclone Occurrence between the Atlantic and the Western North Pacific显示文摘Climatologically,among all ocean basins,the western North Pacific(WNP)has the largest annual number of tropical cyclones(TCs)of around 26 while the Atlantic has around 13,yielding a difference of 13.However,the difference is-7 in 2020,with 30 TCs in the Atlantic and 23 in the WNP,which is the most negative difference within the last 46 years.In fact,during the last 26 years,the difference in TC number is below 10 in ten years,with four years being negative.Such a decreasing difference in TC number can be attributed to the natural multidecadal variation of the Atlantic Multidecadal Oscillation and Interdecadal Pacific Oscillation,as well as other external forcings such as anthropogenic aerosol forcing and increased greenhouse gases,with the additional impact from the La Niña condition.This result has significant implications on climate model projections of future TC activity in the two ocean basins. | Johnny C.L.CHAN Kin Sik LIU | 2022 | Advances in Atmospheric Sciences2022，39，9： | 1 |
| 9 | Growing Threat of Rapidly-Intensifying Tropical Cyclones in East Asia显示文摘This study examines the long-term change in the threat of landfalling tropical cyclones(TCs) in East Asia over the period 1975–2020 with a focus on rapidly intensifying(RI) TCs. The increase in the annual number of RI-TCs over the western North Pacific and the northwestward shift of their genesis location lead to an increasing trend in the annual number of landfalling RI-TCs along the coast of East Asia. The annual power dissipation index(PDI), a measure of the destructive potential of RI-TCs at landfall, also shows a significant increasing trend due to increases in the annual frequency and mean landfall intensity of landfalling RI-TCs. The increase in mean landfall intensity is related to a higher lifetime maximum intensity(LMI) and the LMI location of the landfalling RI-TCs being closer to the coast. The increase in the annual PDI of East Asia is mainly associated with landfalling TCs in the southern(the Philippines, South China, and Vietnam) and northern parts(Japan and the Korean Peninsula) of East Asia due to long-term changes in vertical wind shear and TC heat potential. The former leads to a northwestward shift of favorable environments for TC genesis and intensification, resulting in the northwestward shift in the genesis, RI, and LMI locations of RI-TCs. The latter provides more heat energy from the ocean for TC intensification, increasing its chances to undergo RI. | Kin Sik LIU Johnny C.L.CHAN | 2022 | Advances in Atmospheric Sciences2022，39，2： | 0 |
| 10 | Importance of Air-Sea Coupling in Simulating Tropical Cyclone Intensity at Landfall显示文摘An atmosphere-only model system for making seasonal prediction and projecting future intensities of landfalling tropical cyclones(TCs)along the South China coast is upgraded by including ocean and wave models.A total of 642 TCs have been re-simulated using the new system to produce a climatology of TC intensity in the South China Sea.Detailed comparisons of the simulations from the atmosphere-only and the fully coupled systems reveal that the inclusion of the additional ocean and wave models enable differential sea surface temperature responses to various TC characteristics such as translational speed and size.In particular,interaction with the ocean does not necessarily imply a weakening of the TC,with the coastal bathymetry possibly playing a role in causing a near-shore intensification of the TC.These results suggest that to simulate the evolution of TC structure more accurately,it is essential to use an air-sea coupled model instead of an atmosphere-only model. | Charlie C.F.LOK Johnny C.L.CHAN Ralf TOUMI | 2022 | Advances in Atmospheric Sciences2022，39，10： | 0 |
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