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首页> 外文学位 >Investigation of microphysical assumptions in TRMM radiometer's rain profile algorithm using KWAJEX satellite, aircraft and surface datasets.
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Investigation of microphysical assumptions in TRMM radiometer's rain profile algorithm using KWAJEX satellite, aircraft and surface datasets.

机译：使用KWAJEX卫星，飞机和地面数据集研究TRMM辐射计的降雨剖面算法中的微物理假设。

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摘要

This research intercompares in situ aircraft microphysical measurements directly with the assumed microphysical parameters of the level 2 Tropical Rainfall Measuring Mission (TRMM) facility radiometer algorithm where retrievals are obtained from reconstructed and coincident TRMM overpasses during the 1999 Kwajalein Atoll field experiment (KWAJEX). The analyzed differences are used to diagnose weaknesses in the assumed profile microphysics and to guide a physically-based reformulation of the microphysical representations in the 2A-12 algorithm which would mitigate the weaknesses. The analysis process includes the introduction of a passive microwave emission---scattering (E-S) coordinate system that permits concurrent mapping and quantitative comparison of radiometer brightness temperatures, radar reflectivities, rainrates, and bulk microphysical parameters; and application of a hypothesis test which asserts that 2A-12 to ground radar-derived rainrate differences are correlated to differences in assumed versus observed liquid-ice bulk microphysical properties. Thus, the main scientific objective of this research is to identify and overcome the foremost model-generated microphysical weaknesses in the TRMM 2A-12 facility algorithm through analysis of (1) in situ aircraft microphysical observations; (2) ground-, aircraft-, and satellite-based radar measurements; (3) aircraft- and satellite-based radiometer measurements; (4) synthetic satellite radar reflectivities and radiometer brightness temperatures; (5) radiometer-only (2A-12) satellite retrievals; and (6) radar-only (2A-25) algorithm retrievals.;Results indicate the assumed 2A-12 microphysical profiles differ most from aircraft observations where ground-aircraft radar and 2A-12 rainrate differences are greatest. Analysis of the E-S coordinate system intercomparisons reveals a lack of mixed-layer ice hydrometeor scatterers in the model-generated profiles as compared to observed profiles. Direct comparisons between aircraft measured and model-generated 2A-12 microphysics suggest that, on average, the radiometer algorithm's microphysics database retrieves liquid and ice water contents ∼3 times smaller than observed at levels less than 10 km. The 2A-12 rainrate retrievals are shown to be strongly influenced by the algorithm's convective fraction specification. Modification of this factor is proposed as a means to improve 2A-12 rainrate retrievals, however fundamental changes to the cloud-radiation model's ice parameterization would be necessary to physically correct the algorithm's diagnosed mixed-layer ice hydrometeor deficits.
机译：这项研究将原位飞机的微物理测量结果与2级热带雨量测量任务（TRMM）设施辐射计算法的假定微物理参数直接进行了相互比较，在1999年夸贾林环礁野外实验（KWAJEX）期间，从重建的和重合的TRMM立交获得了取回信息。分析的差异用于诊断假定的轮廓微物理学中的弱点，并指导2A-12算法中基于物理的微观物理表示形式的重新制定，以缓解弱点。分析过程包括引入无源微波发射-散射（E-S）坐标系统，该系统允许同时绘制地图并进行辐射度计亮度温度，雷达反射率，降雨率和大量微物理参数的定量比较；假设试验的应用，该试验认为2A-12与地面雷达得出的降雨率差异与假定的和观察到的液态冰块微物理特性的差异相关。因此，本研究的主要科学目标是通过分析（1）飞机原位微物理观测结果，识别并克服TRMM 2A-12设施算法中模型生成的最微物理缺陷。 （2）地面，飞机和卫星雷达测量； （3）飞机和卫星辐射计的测量； （4）合成卫星雷达的反射率和辐射计的亮度温度； （5）仅辐射计（2A-12）卫星检索； （6）仅雷达（2A-25）算法检索。结果表明，假定的2A-12微观物理特征与飞机观测最大不同，在飞机观测中，地面飞机雷达和2A-12降雨率差异最大。 E-S坐标系之间的比较分析表明，与观测到的剖面相比，在模型生成的剖面中缺少混合层冰水气溶胶散射体。飞机实测值与模型生成的2A-12微观物理学之间的直接比较表明，辐射计算法的微观物理学数据库平均检索到的液体和冰水含量比在不到10 km的水平上观测到的要小3倍。结果表明，2A-12降雨率反演受算法对流分数规范的强烈影响。提议修改此因子作为改善2A-12降雨率反演的一种手段，但是，对云辐射模型的冰参数化进行根本性更改对于物理上校正算法诊断出的混合层冰水凝结物赤字是必要的。

著录项

  • 作者

    Fiorino, Steven Thomas.;

  • 作者单位

    The Florida State University.;

  • 授予单位 The Florida State University.;
  • 学科 Physics Atmospheric Science.;Geophysics.
  • 学位 Ph.D.
  • 年度 2002
  • 页码 128 p.
  • 总页数 128
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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