| 摘要: |
| 根据1974～1997年卫星观测的OLR(射出长波辐射)资料计算OLR的特征量,用其表征ITCZ和副热带高压的位置和强度,分析影响福建热带气旋(TC)年频数与ITCZ和副热带高压的关系。结果表明,TC异常偏少(多)年,ITCZ位置偏南(北),强度偏弱(强),副高位置偏南(北);TC异常年份前期OLR场特征关系表明,TC异常偏多年和异常偏少年太平洋上的OLR距平场配置相反,即TC异常偏少(多)年,西太平洋热带地区OLR为正距平,而赤道中东太平洋为负(正)距平区。 |
| 关键词: 热带气旋 异常 OLR场 特征分析 |
| DOI： |
| 分类号: |
| 基金项目:“九五”国家重中之重课题(96-908-05-06-12)资助 |
|
| PRELIMINARY ANALYSIS OVER OLR FIELDS EFFECTING YEAR-FREQUENCY OF TROPICAL CYCLONE ABNORMALITY IN FUJIAN |
|
GAO Jian-yun, LI Yong-yao, SONG De-zhong
|
|
Climate Center of Fujian, Fuzhou 350001, China
|
| Abstract: |
| Using OLR (outer long-wave radiation) fields observed by NOAA during the period between 1974 and 1997, locations and intensities of ITCZ and subtropical high over the west Pacific denoted by OLR feature quantity are obtained by feature analysis. The result shows that in years of negative anomalous frequency of tropical cyclones in Fujian, ITCZ and the subtropical high lie in more southern location and both are weaker, and vice versa, in terms of the relations between year-frequency of tropical cyclones and ITCZ and the subtropical high. And the early-time OLR features indicate that the field allocation in years of negative anomalous frequency of TC is always an opposite one in years of positive anomalous frequency of TC in the Pacific. That is, in years of negative anomalous frequency of TC negative anomalies cover the tropical west Pacific and the tropical middle Pacific while positive anomalies cover the tropical middle Pacific in years of positive anomalous frequency of TC. |
| Key words: Tropic cyclone abnormality OLR fields feature analysis |
