摘要
利用气象场的再分析资料和太阳辐射活动资料,对太阳11年周期活动影响北半球冬季(11月～3月)大气环流的过程进行了统计分析和动力学诊断.根据赤道平流层纬向风准两年振荡(QBO)的东、西风状态对太阳活动效应进行了分类讨论,结果表明:东风态QBO时,太阳活动效应主要集中在赤道平流层中、高层和南半球平流层,强太阳活动时增强的紫外辐射加热了赤道地区的臭氧层,造成平流层低纬明显增温,同时加强了南半球的Brewer-Dobson(B-D)环流,引起南极高纬平流层温度增加;而北半球中高纬的环流主要受行星波的影响,太阳活动影响很小.西风态QBO时,太阳活动效应在北半球更为重要,初冬时强太阳活动除了加热赤道地区臭氧层外,还抑制了北半球的B-D环流,造成赤道平流层温度增加和纬向风梯度在垂直方向的变化,从而改变了对流层两支行星波波导的强度;冬末时在太阳活动调制下,行星波向极波导增强,B-D环流逐渐恢复,造成北半球极地平流层明显增温,同时伴随着赤道区域温度的下降.
Based on the scanning differential optical absorption spectroscopy （DOAS） system, vertical distribution of air pollutants （SO2, HCHO, O3 and NO2） were observed continuously from Aug 27, 2007 to Sep 4, 2007 in Chaoyang District of Beijing and their vertical profiles were analyzed. The typical vertical variation characteristic of SO2 and nocturnal NO titration to O3 were discussed. The results indicated that the gradient of SO2 was not obvious, and the negative gradient appeared during the morning hours when wind speed was low. The measurement also clearly showed the dominant role of NO titration for vertical variations of nocturnal chemistry in urban areas and O3 concentrations was mainly influenced by the direct emissions of NO.
出处
《地球物理学报》
SCIE
EI
CAS
CSCD
北大核心
2010年第6期1269-1277,共9页
Chinese Journal of Geophysics
基金
国家重点基础研究发展计划(2010CB428604)
国家自然科学基金重点项目(40633015)资助
