Evaluation of the statistical cloud scheme in the ECHAM5 model using satellite data

Evaluation of the statistical cloud scheme in the ECHAM5 model using satellite data
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利用卫星数据评估ECHAM5模型中的统计云方案

DOI:
10.1002/qj.887
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发表时间:
2011
影响因子:
8.9
通讯作者:
P. Räisänen
P. Räisänen
中科院分区:
地球科学3区
文献类型:
--
作者:
J. Quaas;P. Räisänen

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提出了对统计云方案的评估,该方案考虑了大气 ECHAM5 大气环流模型中水蒸气和云凝结物的亚网格尺度变化。三维模型的水蒸气、云液态水和云冰随机分布到每个网格盒的子列中,并垂直整合到总水路径(TWP)中。因此,由于其指数分布,在 TWP 的评估中强调了低层大气。将编辑后的模型数据集与中分辨率成像光谱辐射计 (MODIS) 卫星仪器测量的 TWP 全球分析分布进行比较。结果表明,平均TWP和平均云量模拟得相对较好。然而,对概率密度函数 (PDF) 的方差和偏度的评估揭示了很大的缺陷。全球几乎所有地区都发现系统性负方差偏差。 TWP 的偏度在热带地区被高估,而在高纬度地区被低估。此外,还进行了敏感性实验,以揭示参数化中的缺陷,导致观察到的 TWP 方差和偏度偏差。研究发现,可以通过修改对流对 PDF 的影响来减少热带地区偏度的正偏差。版权所有 © 2011 英国皇家气象学会
An evaluation of a statistical cloud scheme taking into account subgrid‐scale variability for water vapour and cloud condensate in the ECHAM5 general circulation model of the atmosphere is presented. Three‐dimensional modelled water vapour, cloud liquid water and cloud ice were distributed stochastically into subcolumns of each grid box and vertically integrated to total water path (TWP). Thus the lower atmosphere is emphasized in the evaluation of TWP due to its exponential profile. The edited model dataset was compared with the globally analyzed distribution of TWP measured by the Moderate Resolution Imaging Spectroradiometer (MODIS) satellite instrument. The results show that the mean TWP and mean cloud cover are on average relatively well simulated. However, large deficiencies are revealed by the evaluation of both variance and skewness of the probability density function (PDF). Systematically negative deviations of variance are found for almost all regions of the globe. Skewness of the TWP is overestimated in the Tropics and underestimated at high latitudes. Moreover, sensitivity experiments were performed to reveal the deficiencies in the parametrization leading to the observed deviations of variance and skewness of TWP. It was found that the positive bias in skewness in the Tropics can be reduced by modifying the influence of convection on the PDF. Copyright © 2011 Royal Meteorological Society
DOI: 10.1002/qj.660
发表时间: 2010-07
影响因子: 8.9
作者:
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通讯作者: A. Kuwano‐Yoshida;Takeshi Enomoto;W. Ohfuchi
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发表时间: 2009-11
期刊: Climate Dynamics
影响因子: 4.6
作者:
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通讯作者: M. Watanabe;S. Emori;S. Emori;S. Emori;Masaki Satoh;Masaki Satoh;Hiroaki Miura
DOI: --
发表时间: 2009
期刊:
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DOI: --
发表时间: 2003
期刊:
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DOI: --
发表时间: 1996
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