Observation of CO2 Regional Distribution Using an Airborne Infrared Remote Sensing Spectrometer (Air-IRSS) in the North China Plain
Observation of CO2 Regional Distribution Using an Airborne Infrared Remote Sensing Spectrometer (Air-IRSS) in the North China Plain
复制标题
华北平原机载红外遥感光谱仪（Air-IRSS）观测CO2区域分布
DOI：
10.3390/rs11020123
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发表时间：
2019
期刊：
影响因子：
5
通讯作者：
Sun Youwen
中科院分区：
文献类型：
--
作者：
Wang Ruwen;Xie Pinhua;Xu Jin;Li Ang;Sun Youwen
二氧化碳（CO2）是最重要的人为温室气体之一，对大气系统的能量平衡有着重要的影响。CO2测量的更大覆盖范围和更高的空间分辨率可以补充现有的现场网络和卫星测量，从而提高我们对全球碳循环的理解。在这项研究中，我们提出了一个自制的机载红外遥感光谱仪（Air-IRSS）设计，以确定区域分布的CO2。Air-IRSS在1590和1620 nm之间的光谱范围内测量CO2，光谱分辨率为0.45 nm，曝光时间为1 s。它是在一架飞行器上操作的，飞行高度为3公里，速度为180公里/小时，空间分辨率为50.00米× 62.80米。采用加权函数修正差分吸收光谱法（WFM-DOAS）对测得的光谱进行了分析。结果表明，总的不确定度估计的CO2柱的检索是1.26%的空中测量在一个大的区域，和0.30%的固定点，如电源点或工厂。在无振动的静态条件下，地面Air-IRSS观测可以充分再现温室气体观测卫星（GOSAT）观测到的变化，相关系数（r）为0.72。最后，我们进行了一个空中实地活动，以确定区域分布的CO2在华北平原。利用GPS资料得到了邢台、衡水、石家庄和保定4个城市CO2柱的区域分布，其变化范围为2.00 × 1021 moleccm-2 ~ 3.00 × 1021 moleccm-2。在无CO2排放源区，CO2垂直分布在3 km以下基本均匀，最高值出现在保定市上空。
Carbon dioxide (CO2) is one of the most important anthropogenic greenhouse gases (GHG) and significantly affects the energy balance of atmospheric systems. Larger coverage and higher spatial resolution of CO2 measurements can complement the existing in situ network and satellite measurements and thus improve our understanding of the global carbon cycle. In this study, we present a self-made airborne infrared remote sensing spectrometer (Air-IRSS) designed to determine the regional distribution of CO2. The Air-IRSS measured CO2 in the spectral range between 1590 and 1620 nm at a spectral resolution of 0.45 nm and an exposure time of 1 s. It was operated onboard an aircraft at a height of 3 km with a velocity of 180 km/h, and a spatial resolution of 50.00 m × 62.80 m. Weighting function modified differential optical absorption spectroscopy (WFM-DOAS) was used to analyze the measured spectra. The results show that the total uncertainty estimated for the retrieval of the CO2 column was 1.26% for airborne measurements over a large region, and 0.30% for a fixed point, such as power points or factories. Under vibration-free static conditions, the on-ground Air-IRSS observations can adequately reproduce the variations observed by Greenhouse Gases Observing Satellite (GOSAT )with a correlation coefficient (r) of 0.72. Finally, we conducted an airborne field campaign to determine the regional distribution of CO2 over the North China Plain. The regional distribution of CO2 columns over four cities of Xing-tai, Hengshui, Shijiazhuang, and Baoding were obtained with the GPS information, which ranged from 2.00 × 1021 molec cm−2 to 3.00 × 1021 molec cm−2. The CO2 vertical distributions were almost uniform below a height of 3 km in the area without CO2 emission sources, and the highest values were found over Baoding City.