Numerical simulation of the 7 to 9 September 2006 AMMA mesoscale convective system: Evaluation of the dynamics and cloud microphysics using synthetic observations
Numerical simulation of the 7 to 9 September 2006 AMMA mesoscale convective system: Evaluation of the dynamics and cloud microphysics using synthetic observations
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2006年9月7日至9日AMMA中尺度对流系统的数值模拟：利用综合观测评估动力学和云微物理
DOI：
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
S. Cautenet
中科院分区：
文献类型：
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作者：
Guillaume Penide;V. Giraud;D. Bouniol;P. Dubuisson;C. Duroure;A. Protat;S. Cautenet
本文用BRAMS模式（巴西区域大气模拟系统）对AMMA（非洲季风多学科分析）试验观测到的一个中尺度对流系统（MCS）进行了数值模拟。目的是记录MCS的生命周期，并通过利用从模拟场计算的综合观测结果来识别关键的云微物理过程及其特征。分别利用Mie散射理论和FASDOM （Fast Discrete Ordinate Method）快速辐射传输代码模拟了以8.7、10.6和12µm为中心的三个SEVIRI （Spinning Enhanced Visible and infrared Imager）通道的95 GHz等效雷达反射率因子、多普勒速度和红外亮度温度。将合成观测和模型变量与来自多个平台（W波段和麻省理工学院（MIT）地基多普勒雷达、探测、飞机测量和第二代气象卫星）的各种测量结果进行比较，以评估不同尺度的模型，并识别微物理特性的特征，重点关注MCS的砧部。一种同时使用ARM和MIT雷达数据的方法被用来识别MCS内的不同区域。发现了与直接比较的相对较好的一致性，以及明显需要改进的微物理方案参数化的差异（使用原位测量）。微物理特征也使用联合雷达反射率/多普勒-高度直方图进行了研究。他们的分析表明，该模型倾向于夸大边缘过程的作用，即使在MCS的铁砧部分也是如此。粒度分布的比较（模拟和原位测量）表明，该模型能够重现复杂的psd（例如，多模态行为）。版权所有©2010英国皇家气象学会
This paper presents a numerical simulation of a Mesoscale Convective System (MCS) observed during the AMMA (African Monsoon Multidisciplinary Analysis) experiment with the BRAMS model (Brazilian Regional Atmospheric Modelling System). The aim is to document the life cycle of the MCS and to identify key cloud microphysical processes and their signatures by making use of synthetic observations calculated from the simulated fields. These observations: ARM (Atmospheric Radiation Measurement) 95 GHz equivalent radar reflectivity factor and Doppler velocity and infrared brightness temperatures in three SEVIRI (Spinning Enhanced Visible and InfraRed Imager) channels centred at 8.7, 10.6 and 12 µm are simulated using respectively Mie scattering theory and FASDOM (Fast Discrete Ordinate Method), a fast radiative transfer code. Synthetic observations and model variables are compared to various measurements from several platforms (W‐band and Massachusetts Institute of Technology (MIT) ground‐based Doppler radars, soundings, aircraft measurements, and Meteosat Second Generation) to evaluate the model at different scales and to identify the signatures of microphysical properties with a focus on the anvil part of the MCS. A method using both the ARM and the MIT radar data is used to identify the different regimes within the MCS. A relatively good agreement with direct comparisons is found, as well as discrepancies in the microphysical scheme parametrization that clearly need improvements (using in situ measurements). Microphysical signatures are also studied using joint radar reflectivity/Doppler‐height histograms. Their analysis shows that the model tends to overplay the role of the riming processes, even in the anvil part of the MCS. Comparisons of the Particle Size Distributions (simulated and measured in situ) show the model's ability to reproduce complex PSDs (e.g. a multimodal behaviour). Copyright © 2010 Royal Meteorological Society
影响因子：
4.4
作者：
Delanoe, Julien;Hogan, Robin J.
通讯作者：
Hogan, Robin J.