An overview of satellite-based formaldehyde retrieval and present status
ZHU Song-yan1,2, YU Chao3, LI Xiao-ying1, CHEN Liang-fu1, ZHU Hao4
1. State Key Laboratory of Remote Sensing Science, Institute of Remote Sensing and Digital Earth, Chinese Academy of Sciences, Beijing 100101, China; 2. School of Electronic, Electrical and Communication Engineering, University of Chinese Academy of Sciences, Beijing 100049, China; 3. State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China; 4. College of Resources and Environment, Chengdu University of Information Technology, Chengdu 610103, China
Abstract：Formaldehyde (HCHO) is a toxic trace gas and carcinogen that mainly concentrates in atmospheric planetary layer. The lifetime of HCHO is short at an order of several hours. Anthropogenic VOC gradually becomes a negligible part of air pollution in China and HCHO is an important indicator of VOC. Apparently, the investigation of HCHO is very valuable. Due to the lack of in situ observations for HCHO, satellite-based remote sensing proving frequent and large coverage measurements becomes a significant alternative. In this study, the payloads for HCHO detection and retrieval theories were discussed and analyses concerning the research status in China were provided along with corresponding shortcomings. From the last century, payloads commonly available for HCHO detection were GOME/ERS-2, SCIAMACHY/ENVISAT, OMI/Aura, GOME-2/MetOp-A(B) and OMPS/Suomi-NPP. Relative information were reviewed about satellite orbits, spatiotemporal resolution and appliance in HCHO retrieval. Because of the top-down observation of satellite platform which is different to the bottom-up of in situ observation, the retrieval algorithms are different as well. Apparently, the main focus here is two majorly adopted methods for HCHO retrieval:differential optical absorption spectroscopy (DOAS) and recently proposed principal component analysis (PCA).
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