OLR与南海热带气旋发展的关系
RELATIONSHIP OF OLR AND DEVELOPMENTOF TROPICAL CYCLONE OVER SOUTH CHINA SEA
-
摘要: 利用OLR资料,对近十多年(1990~2000年)的南海热带气旋的发生、发展与OLR之间的关系进行了分析研究。研究结果表明:南海热带低压能否发展加强成热带风暴与南海区及其附近OLR值的变化有较好的对应关系;OLR低值中心存在于辐合带中热带低压易发展;在双台风状态下,两个低值中心的强弱情况和距离决定热带低压能否发展。通过定义一个南海热带低压的发展指数IOD(Index of Development)来定量描述OLR等值线的梯度变化和南海热带低压发展的关系;当南海热带低压的发展指数IOD≥9时,热带低压易发展成为热带风暴Abstract: The relationship of OLR and the development of tropical cyclones over the South China Sea is studied by using the OLR data (1990—2000). The results show that there is a good relationship between the development of South China Sea tropical depression and the OLR variation over the South China Sea. Tropical depression would easily develop into tropical storm when OLR low center embedded in ITCZ. Under the state of binary typhoons, the development of South China Sea tropical depression depended on the strength and distances of two OLR low centers. IOD (Index of development) was defined to describe the relationship between the variation of OLR and the development of South China Sea tropical depression quantitatively. Tropical depression would easily develop into tropical storm when IOD≥9.
-
Key words:
- OLR;
- South China Sea tropical depression;
- Index of development
-
表 1 9807号TY 低值中心OLR 等值线梯度的变化(1998年9月)
表 2 9813号TS低值中心OLR 等值线梯度的变化(1998年11月)
表 3 9905号TS低值中心OLR 等值线梯度的变化(1999年7月)
表 4 1998年8月5日18:00生成的TD 低值中心OLR 等值线梯度的变化
-
[1] 蒋尚城,朱亚芬. OLR的应用和图集.北京:北京大学出版社,1990.1-25. [2] 蒋尚城. OLR资料应用于热带大气环流系统的分析. 气象,1993,19(11):50-53. http://www.cnki.com.cn/Article/CJFDTOTAL-QXXX199311010.htm [3] 谢安,叶谦. OLR低频振荡与西太平洋台风的发生. 应用气象学报,1994,5(2):143-149. http://qk.cams.cma.gov.cn/jams/ch/reader/view_abstract.aspx?file_no=19940228&flag=1 [4] 段丽,蒋尚城. 盛夏OLR月距平对TC登陆和影响华南的预报研究.热带气象学报,2001,17(3):258-264. http://www.cnki.com.cn/Article/CJFDTOTAL-RDQX200103007.htm [5] 董超华,章国才,邢福源,等.气象卫星业务产品释用手册. 北京:气象出版社,1999.9-12.