摘要
观测分析表明对流云中水云重要,而层状云中冰云重要。因此,提出了一个基于液水路径和冰水路径阈值划分对流-层状降水的新方案。液水路径和冰水路径的值可通过线性回归方程由不同AMSU微波通道(23.8、31.4、89、150 GHz)的亮温计算得出。通过对由TOGA COARE试验资料作为强迫场的二维云分辨模式的模拟结果的分析,对该划分方案进行讨论。若液水路径大于1.91 mm或冰水路径大于1.70 mm,则划分为对流降水;相反,则划分为层状降水。通过对地面降水收支的分析表明,该划分方案是具有物理意义的。
A new scheme that separates convective-stratiform rainfall is developed using threshold values of liquid water path （LWP） and ice water path （IWP）. These cloud contents can be predicted with radiances at the Advanced Microwave Sounding Unit （AMSU） channels （23.8, 31.4, 89, and 150 GHz） through linear regression models. The scheme is demonstrated by an analysis of a two-dimensional cloud resolving model simulation that is imposed with forcings from the Tropical Ocean Global Atmosphere Coupled Ocean-Atmosphere Response Experiment （TOGA COARE）. The rainfall is considered convective if associated LWP is larger than 1.91 mm or IWP is larger than 1.70 mm. Otherwise, the rainfall is stratiform. The analysis of surface rainfall budget demonstrates that this new scheme is physically meaningful.
出处
《热带气象学报》
CSCD
北大核心
2013年第6期881-888,共8页
Journal of Tropical Meteorology
基金
国家重点基础研究发展计划973项目(2011CB403405、2013CB430103)
国家自然科学基金项目(41075039、41175065、41375058)
江苏高校优势学科建设工程资助项目(PAPD)
江苏高等学校优秀科技创新团队基金共同资助
关键词
云分辨模式模拟
辐射传输模式
亮温模拟
对流-层状降水划分
液水路径
冰水路径
Cloud-resolving model simulation
radiance transfer model
radiance temperature simulation
convective-stratiform rainfall partition
liquid water path
ice water path
