热带气象学报2016，Vol.32Issue(5)：577-587,11.DOI:10.16032/j.issn.1004-4965.2016.05.001
夏季（5-10月）南海准双周和20～60天振荡的年代际变化特征
THE DECADAL VARIATION OF QUASI-BIWEEKLY AND 20 ~60-DAY INTRASEASONAL OSCILLATION IN SOUTH CHINA SEA IN SUMMER(MAY-OCTOBER)
摘要
Abstract
Using period and wave number-frequency analysis,the sub-seasonal variability of summer (May—October)convection over the South China Sea exhibits two dominant timescales,one with a quasi-biweekly (QBWO)period (1 0 ~20 days)and the other with an intraseasonal oscillation.The northward propagation spectrum is much stronger than the southward,meridional propagating QBWO and ISO with wave number 2.In the zonal propagation,for the QBWO mode,the westward propagation spectrum with wave number 1 is the strongest.But for the ISO,the spectrums of the westward propagation and eastward propagation with wave num-ber 1 are quite the same.During three different time of the atmospheric circulation of the decadal change, namely 1 958—1 976、1 977—1 993 and 1 994—201 1 ,the QBWO intensity,propagation numbers,frequency and spectrum energy tend to enhance gradually.Different from the QBWO mode,the intensity of ISO experiences periods of being normal and slightly weaker,weaker and stronger variation,while the propagation numbers,fre-quency and spectrum energy are the stronger,weaker and stronger.The factors that cause these changes are dif-ferent.The air-sea interaction and the water vapor convection conditions played a leading role together in the change of QBWO.For the ISO mode,vertical zonal wind shear is more important.关键词
南海/准双周/20~60天振荡/年代际Key words
South China Sea/quasi-biweekly/20 ~60-day/decadal oscillation分类
天文与地球科学引用本文复制引用
李春晖,何超,郑彬,谷德军,林爱兰..夏季（5-10月）南海准双周和20～60天振荡的年代际变化特征[J].热带气象学报,2016,32(5):577-587,11.基金项目
973项目（2014CB953901）；国家自然科学基金项目（41205069、41375095、41675096、41575043、41505067）；广东省科技计划重点项目（2012A030200006）；广东省气象局气象科技项目（2013B08）共同资助 （）
