中国激光, 2012, 39 (s2): s214005, 网络出版: 2013-01-05
大气温度、湿度和压强对星载激光雷达测量CO2浓度精度的影响
Effects of Atmosphere Temperature, Humidity and Pressure for a Space-Borne Lidar Measuring Atmosphere CO2 Concentrations
遥感 CO2浓度 积分路径差分吸收 星载激光雷达 测量误差 remote sensing carbon-dioxide concentration integrated path differential absorption space-borne lidar measurement error
摘要
研究了大气温度、湿度和压强的不确定性对于星载积分路径差分吸收(IPDA)激光雷达系统测量大气CO2柱线浓度精度的影响。介绍了测量大气CO2柱线浓度的基本原理和CO2吸收截面计算方法,理论分析并模拟计算了吸收峰(On-line)波段范围不同大气温度、湿度和压强的误差对于大气CO2柱线浓度反演精度的影响。对于给出的优化工作波长,在吸收峰波数为6361.2250 cm-1,吸收谷(Off-line)波数为6360.99 cm-1,温度不确定性为1 K、湿度不确定性为10%以及压强不确定性为0.001的条件下,综合导致的CO2柱线浓度测量误差为0.296×10-6,为高精度反演大气CO2柱线浓度提供了重要参考数据。
Abstract
The influences of atmospheric temperature, humidity and pressure uncertainties on space-borne integrated path differential absorption (IPDA) lidar measuring atmospheric column-averaged CO2 concentrations are studied. The column-averaged CO2 concentrations measurement principle and CO2 absorption cross section calculation method are presented. The influences of atmospheric temperature, humidity and pressure errors on retrieving CO2 concentrations around on-line CO2 absorption line are analyzed and simulations are implemented. For optimal IPDA lidar on-line and off-line wave number of 6361.2250 cm-1 and 6360.99 cm-1, the total column-averaged CO2 concentration measurement error is calculated to be 0.296×10-6 with temperature error of 1 K, humidity error of 10% and relative pressure error of 0.001. The result is important for retrieval of column-averaged CO2 concentration with high precision and lidar system parameters optimization.
谢杨易, 刘继桥, 姜佳欣, 陈卫标. 大气温度、湿度和压强对星载激光雷达测量CO2浓度精度的影响[J]. 中国激光, 2012, 39(s2): s214005. Xie Yangyi, Liu Jiqiao, Jiang Jiaxin, Chen Weibiao. Effects of Atmosphere Temperature, Humidity and Pressure for a Space-Borne Lidar Measuring Atmosphere CO2 Concentrations[J]. Chinese Journal of Lasers, 2012, 39(s2): s214005.