刘栋^1,,
董雁冰^1,,,
毛宏霞¹,
包醒东¹,
魏合理²
1. 北京环境特性研究所 光学辐射重点实验室, 北京 100854
2. 中国科学院安徽光学精密机械研究所中国科学院大气光学重点实验室, 合肥 230031

基金项目: 光学辐射重点实验室基金项目（JCKYS2019204012），国家自然科学基金项目（41505023）资助


详细信息

作者简介: 刘栋, 男, 1991年生, 博士, 研究方向为中高层大气物理, 环境光学特性建模及其应用.E-mail:ldwl2009@126.com

通讯作者: 董雁冰, 男, 1959年生, 博士生导师, 研究方向为环境光学特性建模, 环境遥感.E-mail:michaeld207@sohu.com

中图分类号: P351

收稿日期:2019-12-26
修回日期:2020-12-30
上线日期:2021-02-10

Interannual variations of carbon dioxide volume mixing ratio in the mesosphere and lower thermosphere

LIU Dong^1,,
DONG YanBing^1,,,
MAO HongXia¹,
BAO XingDong¹,
WEI HeLi²
1. Science and Technology on Optical Radiation Laboratory, Beijing Institute of Environmental Feature, Beijing 100854, China
2. Key Laboratory of Atmospheric Optical Radiation, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China


More Information

Corresponding author: DONG YanBing,E-mail:michaeld207@sohu.com

MSC: P351

--> Received Date: 26 December 2019
Revised Date: 30 December 2020
Available Online: 10 February 2021


摘要
摘要:利用17年的SABER（Sounding of the Atmosphere using Broadband Emission Radiometry）Level2C数据研究了中间层与低热层大气（MLT，Mesosphere and Lower Thermosphere）CO₂ VMR（Volume Mixing Ratio）的年际变化特征.使用多元线性回归模型对双月平均时间序列拟合，定量地提取各变化特征.结果表明，SABER CO₂ VMR长期趋势在中间层保持在5.5%/decade左右，在中间层顶和低热层降低至4.5%/decade左右；结果与模式预测在统计意义上相符.长期趋势没有显著的纬度差异，但在各纬度上都具有明显的季节依赖，MLT CO₂ VMR长期趋势的季节性改变源自低层大气长期趋势季节性改变.SABER CO₂ VMR对QBO（Quasi-Biannual Oscillation）和ENSO（El Ni?o-Southern Oscillation）在绝大多数区域没有统计显著的响应；对太阳活动11年循环以负响应为主，在部分区域出现的微弱正响应目前没有合适的物理机制解释.
关键词: 中间层与低热层/
二氧化碳/
年际变化

Abstract:Employing 17-year SABER (Sounding of the Atmosphere using Broadband Emission Radiometry) Level2C data, the interannual variations of CO₂ VMR (Volume Mixing Ratio) in the MLT (Mesosphere and Lower Thermosphere) have been investigated. The multiple linear regression fitting was applied to the bimonthly time series for each latitude bin between 50°S and 50°N from 65 km to 110 km. The results show that the long-term trend of SABER CO₂ VMR is about 5.5%/decade in the mesosphere and decreases to about 4.5%/decade in the mesopause and lower thermosphere, which is statistically consistent with the prediction of the model. The noticeable variation of the latitudinal long-term trend has not been found. On the other hand, the seasonal dependence of the trend is visible at all latitudes, which is attributed to the upward propagation of the seasonal dependence of CO₂ VMR trend at lower atmosphere. The response to QBO (Quasi-Biannual Oscillation) and ENSO (El Ni?o-Southern Oscillation) of SABER CO₂ VMR is statistically negligible. The response to 11-year solar cycle is negative in the most regions above 80 km owing to the MLT CO₂ photolysis and eddy mixing. However, small but statistically significant positive response to solar cycle is present between 65 km and 75 km and at 105 km near equator, which has no appropriate physical mechanism to explain yet.
Key words:Mesosphere and lower thermosphere/
Carbon dioxide/
Interannual variations



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