Abstract
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(<i>T</i><sub>sp</sub>),分析50°S—50°N <i>T</i><sub>sp</sub>的时空分布特征.结果表明:<i>T</i><sub>sp</sub>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<i>T</i><sub>sp</sub>,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<i>T</i><sub>sp</sub>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<i>T</i><sub>sp</sub>在2002—2017年的变化约为2K,与<i>F</i><sub>10.7</sub>的相关系数为0.6,在南北纬20°附近与太阳活动指数<i>F</i><sub>10.7</sub>的相关性最大,约0.74.
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