首页> 外文学位 >Documenting hydrometeor layer occurrence within International Satellite Cloud Climatology Project-defined cloud classifications using CLOUDSAT and CALIPSO.
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Documenting hydrometeor layer occurrence within International Satellite Cloud Climatology Project-defined cloud classifications using CLOUDSAT and CALIPSO.

机译:使用CLOUDSAT和CALIPSO在国际卫星云气候学项目定义的云分类中记录水汽层的出现。

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摘要

The multi-decadal and global International Satellite Cloud Climatology Project (hereafter ISCCP) dataset has proven invaluable to the modeling community. ISCCP provides information only on the effective radiative top of cloud layers in a vertical column and the column-integrated optical depth. The effective radiative cloud top has been used to characterize cloudy pixels in terms of certain morphological types even though this is known to be inaccurate. In the presence of multiple clouds layers, such as cirrus over boundary layer clouds, the effective radiative cloud top may have little to do with the geometric distribution of hydrometeor layers. This ambiguity in the presence of multiple cloud layers leads to possible misinterpretations of ISCCP statistics when cast into the traditional cloud top pressure-optical depth classifications. CloudSat and CALIPSO provide detailed information regarding the vertical structure of clouds layers but on a much coarser temporal and spatial grid. Therefore, we use the detailed information from CloudSat and CALIPSO to document the actual distribution of cloud layers within the ISCCP cloud classifications. Cloud properties provided from CloudSat and CALIPSO combined with atmospheric state data from ECMWF and column optical depth from MODIS are input into an ISCCP simulator code to provide ISCCP-like cloud top pressures and the active remote sensing data are used to explore the vertical structure of cloud and precipitation layers within the standard nine ISCCP cloud top pressure--optical depth classifications. We will show that ISCCP-defined "types" defy a simple interpretation and are often ambiguous within a region and entirely nonunique between regions calling into question recent results that attempt to use ISCCP global statistics to evaluate model results.
机译:多年代和全球的国际卫星云气候学项目(以下简称ISCCP)数据集已被证明对建模界具有无价的作用。 ISCCP仅提供有关垂直列中云层的有效辐射顶部和列积分光学深度的信息。有效辐射云顶已用于根据某些形态学类型来表征浑浊像素,即使已知这是不准确的。在存在多个云层(例如边界层云上的卷云)的情况下,有效的辐射云顶可能与水凝磁层的几何分布无关。当存在多个云层时,这种歧义性会导致将ISCCP统计信息转换为传统的云顶压力-光学深度分类时可能产生误解。 CloudSat和CALIPSO提供了有关云层垂直结构的详细信息,但是在更粗糙的时间和空间网格上。因此,我们使用来自CloudSat和CALIPSO的详细信息来记录ISCCP云分类中云层的实际分布。将CloudSat和CALIPSO提供的云属性与ECMWF的大气状态数据和MODIS的柱光学深度相结合,输入ISCCP仿真器代码,以提供类似ISCCP的云顶压力,并使用有效的遥感数据来探索云的垂直结构。标准ISCCP云顶压力-光学深度分类中的降水和降水层。我们将显示,ISCCP定义的“类型”不符合简单的解释,并且在一个区域内通常是模棱两可的,并且在区域之间是完全不唯一的,这使人们对最近的尝试使用ISCCP全局统计数据评估模型结果的结果提出了质疑。

著录项

  • 作者

    Wrenn, Forrest.;

  • 作者单位

    The University of Utah.;

  • 授予单位 The University of Utah.;
  • 学科 Atmospheric Sciences.
  • 学位 M.S.
  • 年度 2012
  • 页码 75 p.
  • 总页数 75
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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