项目名称: 中国地区不同云状云的时空分布特征和多源云分类产品的比对验证研究
项目编号: No.41205016
项目类型: 青年科学基金项目
立项/批准年度: 2013
项目学科: 大气科学学科
项目作者: 王旻燕
作者单位: 国家气象信息中心
项目金额: 25万元
中文摘要: 不同种类的云通常存在不同的云动力过程和微物理特性,从而表现出不同的云辐射强迫效应。长期以来,云分类研究重点在于算法和对总云量、高中低云云量的分析,但细化到不同云状的云(如卷云、层云、积雨云等),研究还比较少。本课题从ISCCP 产品、MODIS云产品、FY-2业务云分类产品入手,辅以地面观测,揭示我国不同地区不同云状云的时空分布特征和演变规律及多源产品间的定量差异。根据云时空尺度和CloudSat卫星云分类等产品的时空代表性,探索进行多源产品时空匹配验证的尺度转换。重点针对云分类算法难点、典型云系特征中的关键个例,以CloudSat卫星云分类产品为主验证云分类算法准确性并研究云垂直结构,分析多源产品的优劣势、定量差异及其原因。本研究对于揭示我国不同云状云的区域特征,提高和改进云分类产品遥感反演算法、天基产品的时空匹配验证方法、数值模式中云垂直结构参数化方法等具有重要意义。
中文关键词: 云状;云分类产品;时空分布;比对;
英文摘要: Different cloud types usually have different cloud dynamic process and micro-physical characteristics, and the relative cloud radiation forcing effects vary much. In recent years, the focus of cloud classification is the algorithm development, as well as the analysis on total cloud amount, high/middle/low cloud amount. While, research on the different cloud types (like cirrus, stratus, and cumulonimbus) is not enough. In this research, we use ISCCP product, MODIS cloud products, FY-2 operational cloud classification product, and surface observation, to obtain the temporal-spatial distribution characteristics and evolvement of different cloud types in different regions of China, analyze the quantitative difference of multi-source products and the reasons. According to the temporal and spatial scales of cloud, and temporal-spatial representation of cloud classification products based on CloudSat, etc, the scaling is necessary to explore in temporal-spatial matching/validation research. Furthermore, we will use cases analysis to validate the veracity of cloud classification and study cloud vertical structure by using CloudSat data mainly, aiming at the cases of cloud classification algorithm difficulties, typical cloud system, and get the conclusions of advantages/disadvantages of multi-sources cloud classificatio
英文关键词: cloud type;cloud classification products;temporal and spatial distribution;comparison;