YIN Mei-xiang,ZENG Qin-wen,LUO Rui-ting,et al.Analysis of Characteristics of Summer Monsoon over South China Sea in 2012[J].Journal of Chengdu University of Information Technology,2017,(03):328-335.[doi:10.16836/j.cnki.jcuit.2017.03.015]
2012年南海夏季风特征分析
- Title:
- Analysis of Characteristics of Summer Monsoon over South China Sea in 2012
- 文章编号:
- 2096-1618(2017)03-0328-08
- Keywords:
- meteorology; monsoon; South China Sea; outbreak time; circulation situation
- 分类号:
- P485
- 文献标志码:
- A
- 摘要:
- 为进一步认识夏季风的爆发机制,利用NCEP再分析资料及永兴岛的探空资料,对2012年季风爆发前后的环流形势、对流场、水平风场进行分析。结果表明,2012年南海夏季风于5月4候在南海爆发,时间较常年(5月4候)正常。南海夏季风爆发前,南海海域底层盛行东北风,高层盛行偏南风; 爆发后,南海底层盛行西南风,高层盛行偏北风。南海夏季风先在南部爆发,再向北部拓展; 先在底层爆发,再向高层发展。南海夏季风爆发前后北部垂直运动普遍比南部强; 夏季风爆发后,永兴岛的垂直速度出现极大值。影响南海夏季风最大的全球性环流是索马里越赤道气流; 索马里越赤道气流自西向东,跨过中南半岛后开始影响南海季风。
- Abstract:
- In order to further understand the mecchanism of summer outbreak,using NCEP reanalysis and radiosonde data on Yongxing Island to analyze the circulation pattern, convection, wind field around South China Sea summer monsoon(SCSSM)burst in 2012, the results show that: the SCSSM burst in the forth pentad of May as same as average year. Before the onset of the SCSSM, northeasterly winds prevail in the lower level, while southerly winds prevail in the upper. After the onset of the SCSSM, southwesterly winds prevail in the lower level, while Northerly winds prevail in the upper. The SCSSM first bursts in the south South China Sea, then extending to north SCS and the higher level. The convective heating around the north SCS is stronger than in the south generally, while the maximum value appears at Yongxing Island after the onset of the SCSSM has important influence on SCSSM, when it reaches SCS after across Indo-China Peninsula. The Somali jet and the cross-equatorial flow at 105 °E strengthen obviously before the onset of the SCSSM.
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备注/Memo
收稿日期:2016-03-28 资金项目:广东省气象局资助项目(2016B23)