摘要
利用SABER探测器2002—2017年超过一个太阳活动周的数据,以大气垂直方向上40~60km的最大温度作为平流层顶温度(T_(sp)),分析50°S—50°N T_(sp)的时空分布特征.结果表明:T_(sp)具有明显的纬度特征和季节特征,在赤道和南北半球夏季温度较高,而在南北半球冬季的40°—50°纬度附近温度有最低值.再利用EOF方法分析T_(sp),发现其第一模态的解释率达91%,且时间系数与平流层顶高度相关性最大,为-0.75,与平流层顶臭氧体积混合比相关性约0.49,与日地距离相关性为0.44,与太阳活动性(太阳活动指数,太阳黑子数)的相关性约0.33.依据该相关关系,进一步分析各变量原始场,发现T_(sp)和平流层顶臭氧体积混合比的纬度变化近似相反;与日地距离的季节变化有明显的负相关,约-0.81,且这种相关性与日地距离有弱的正相关关系;年平均T_(sp)在2002—2017年的变化约为2K,与F10.7的相关系数为0.6,在南北纬20°附近与太阳活动指数F_(10.7)的相关性最大,约0.74.
A climatology of the stratopause temperature(T_(sp))between 50°S—50°N is studied using the Sounding of the Atmosphere using Broadband Emission Radiometry(SABER)measurement from 2002 to 2017.The results show that T_(sp) is higher in the equator and the summer of the northern or southern hemispheres and the lowest temperature is near 40°latitude in the winter of northern or southern hemispheres.The characteristics are interpreted in the ozone volume mixing ratio(O3-VMR)on stratopause,the Earth-Sun distance,and solar activity using the Empirical Orthogonal Function(EOF)method.The first mode represents 91%of the total T_(sp) variability and its coefficient has the highest correlation of-0.75 with stratopause height,while the correlations with the stratopause O3-VMR,the Earth-Sun distance,and solar activity are 0.49,0.44,and 0.33,respectively.According to these relations,further researches find that T_(sp) has the opposite latitudinal variation with stratopause O3-VMR and the opposite seasonal variation with the Earth-Sun distance.Moreover,the annual averaged T_(sp)varies in a range of 2K from 2002 to 2017 and has a good correlation with F_(10.7).The best correlation coefficient is 0.74 near 20°S and 20°N.
作者
王淼
李正
吕建永
WANG Miao;LI Zheng;LüJianyong(Institute of Space Weather,School of Math and Statistics,Nanjing University of Information Science and Technology,Nanjing 210044)
出处
《空间科学学报》
CAS
CSCD
北大核心
2021年第5期760-768,共9页
Chinese Journal of Space Science
基金
国家重点研发计划项目资助(2018YFC1407305)。
关键词
平流层顶温度
时空分布
EOF分析
臭氧
Stratopause temperature
Spatial and temporal distributions
EOF analysis
Ozone
