| 基于经验模式给定热层温度对热层大气密度反演影响的评估 |
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| 引用本文： | 李若曦,雷久侯.基于经验模式给定热层温度对热层大气密度反演影响的评估[J].地球物理学报,2017,60(8):3015-3022. |
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| 作者姓名： | 李若曦 雷久侯 |
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| 作者单位： | 中国科学技术大学 地球和空间科学学院, 合肥 230026 |
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| 基金项目： | 国家自然科学基金（41325017，41274158）资助. |
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| 摘 要： | 利用加速度计数据反演热层大气密度算法一般需由经验模式给定热层大气温度,进而计算大气阻尼系数C_D.本文基于CHAMP卫星加速度计数据反演得到大气密度,以2008年为例,利用反演得到的热层大气密度循环迭代修正大气阻尼系数C_D,通过对比修正前后密度偏差,评估经验模式给定热层温度对热层大气密度反演造成的影响.结果表明,经验模式热层温度计算偏差对大气密度反演造成的影响小于5%,而且考虑大气成分的改变则进一步降低了这种影响.
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| 关 键 词： | 密度反演 温度 CHAMP卫星 相对分子质量 |
| 收稿时间： | 2017-01-16 |
Effect of the prior model-based thermospheric temperature on the mass density retrieval from accelerometer data |
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| LI Ruo-Xi,LEI Jiu-Hou.Effect of the prior model-based thermospheric temperature on the mass density retrieval from accelerometer data[J].Chinese Journal of Geophysics,2017,60(8):3015-3022. |
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| Authors: | LI Ruo-Xi LEI Jiu-Hou |
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| Institution: | School of Earth and Space Science, University of Science and Technology of China, Hefei 230026, China |
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| Abstract: | Atmospheric drag coefficient CD is a critical parameter in deriving the thermospheric mass density from accelerometer data. Thermospheric temperature from the atmospheric empirical model is usually utilized in the calculation of the CD coefficient. In this paper, we investigate the prior temperature effect on mass density retrieved from the CHAMP accelerometer data during the deep solar minimum year 2008, when the empirical model MSIS00 predicts much higher density. Besides from the MSIS00, the neutral temperatures are estimated from the accelerometer-derived density and subsequently modify neutral composition. Our results show that, the overestimated temperature of the MSIS00 in 2008 introduces the deviation of less than 5% in the retrieved density from accelerometer data. In addition, the change of atmospheric composition due to temperature can further reduce this effect. |
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| Keywords: | Thermospheric density retrieval Temperature CHAMP satellite Relative molecular mass |
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