摘要
提出用气候信号噪音比的概念来分析 ５００ ｈＰａ逐日高度场，并建立 ５００ ｈＰａ高度信号场用来分析我国暴雨发生的气候异常环境。从暴雨发生日当天和前两天的 ５００ ｈＰａ高度场中提取气候异常信号，发现在中国周围的东亚地区（３０～１８０°Ｅ，８０～２０°Ｎ），５００ ｈＰａ信号场的西部出现显著负信号区，中部为正显著信号区，东北部为显著负信号区，大体自西向东呈经向－＋－的分布形势。信号场主要显著信号区大体分布在我国境外的西部和东部，它们的符号相反，是造成我国各大流域地区出现暴雨的主要模态。结果表明，此方法能进行天气意义分析和气候异常现象的统计规律诊断，对我国年度暴雨短期预报分析有一定的参考价值，可以作为传统天气动力诊断的补充工具。
A study of the rule about the heavy rainfall is investigated using the 500 hPa-signal field. The climate signals have been extracted from 500 hPa constant level chart. They are extracted from the day of the heavy rainfall and two proceeding days. The synoptic diagnosis in the signal field can be ana- lyzed. The rule about occurrence of the heavy rainfall and the anomaly climate signal in signal field also is revealed in apomaly climate background. It can be found that the significant signal area with negative values in west of the area in East Asia(30-180°E, 80-20°N), the middle is of the significant signal area with positive values, and the east area is the significant signal area with negative values. It displays a pattern with the mark '-+-', or otherwise. It can be also found that the significant signal areas are in the east and west with the opposed symbol in East Asia. The results of the study show that the signal field can be used as a new accompanied tool in the synoptic diagnostis.
出处
《大气科学》
CSCD
北大核心
2002年第2期221-229,共9页
Chinese Journal of Atmospheric Sciences
基金
国家重点基础研究发展规划项目"我国重大气候和天气灾害形成机理和预测理论的研究"(G1998040901-1)
