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投稿时间：2011-11-15 修订日期：2012-06-17
投稿时间：2011-11-15 修订日期：2012-06-17
中文摘要: 利用NOAA的逐日向外长波辐射(简称OLR)资料、NCEP/NCAR资料和中国台站降水资料，初步研究了热带地区低频振荡与我国南方冬季降水的关系，并分析了低频振荡不同位相对降水的影响。对低频振荡不同位相的合成分析表明：热带低频振荡的相位变化与位于副热带和菲律宾地区的环流系统的低频变化密切相关，并会影响到我国南方地区降水的演变。在低频振荡强度的高指数年，当对流活跃中心位于热带印度洋（热带西太平洋）时，副热带地区的阿拉伯海槽和孟加拉湾槽加深（减弱），菲律宾附近表现为反气旋（气旋）式环流，导致我国南方地区南（北）风异常，同时水汽输送和上升运动增强（减弱），从而导致降水偏多（少）。低指数年各位相的对流、降水以及其他要素的异常均不明显。
中文关键词: 低频振荡强度, 中国南方, 位相合成, 降水, 冬季
Abstract:The relationship of the low frequency oscillation (LFO) intensity and phases in tropics and the winter precipitation in southern China has been investigated based on the NOAA outgoing longwave radiation (OLR) data, NCAR/NCEP data and observed precipitation data in China. The phase composites of the low frequency precipitation for the high index years show that the phase changes are significantly correlated with the low frequency changes of the circulation systems in the subtropical and Philippines and they can affect the precipitation in southern China for different phases. For the high index years when the active convection center is located in tropical Indian Ocean (western Pacific), the Arabian trough and the Bay of Bengal trough are deepened (weakened), and the anticyclone (cyclone) circulation appears near Philippines. Such environment leads to the south (north) wind anomaly to appear in southern China, the moisture and upward motion are increased (decreased) and the precipitation is more (less). The anomalies in convection, precipitation and other factors are not obvious in each phase for the low index years.
keywords: low frequency oscillation (LFO) intensity, southern China, phase composites, precipitation, winter
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基金项目:国家自然科学基金(41175051、40905035和U0833602)及公益性行业（气象）科研专项(GYHY201106015)共同资助
| 作者 | 单位 |
| 冯俊阳 | 南京信息工程大学大气科学学院，南京 210044 解放军63898部队气象台，济源 459000 |
| 肖子牛 | 中国气象局气象干部培训学院，北京 100081 中国科学院大气物理研究所，北京 100029 |
引用文本：
冯俊阳,肖子牛,2012.热带低频振荡的强度和相位对中国南方冬季降水的影响[J].气象,38(11):1355-1366.
FENG Junyang,XIAO Ziniu,2012.Impact of Low Frequency Oscillation Intensity and Phases in Tropics on the Winter Precipitation in Southern China[J].Meteor Mon,38(11):1355-1366.
冯俊阳,肖子牛,2012.热带低频振荡的强度和相位对中国南方冬季降水的影响[J].气象,38(11):1355-1366.
FENG Junyang,XIAO Ziniu,2012.Impact of Low Frequency Oscillation Intensity and Phases in Tropics on the Winter Precipitation in Southern China[J].Meteor Mon,38(11):1355-1366.