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Sensors 2016, 16(11), 1818; doi:10.3390/s16111818

Modelling of XCO2 Surfaces Based on Flight Tests of TanSat Instruments

1
State Key Laboratory of Resources and Environment Information System, Institute of Geographical Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China
2
Spatial Sciences Institute, Dana and David Dornsife College of Letters, Arts, and Sciences, University of Southern California, Los Angeles, CA 90089-0374, USA
3
Ministry of Education Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter, School of Science, Xi’an Jiaotong University, Xi’an 710049, China
4
Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China
*
Author to whom correspondence should be addressed.
Academic Editor: Assefa M. Melesse
Received: 16 August 2016 / Revised: 25 October 2016 / Accepted: 26 October 2016 / Published: 1 November 2016
(This article belongs to the Section Remote Sensors)
View Full-Text   |   Download PDF [5005 KB, uploaded 1 November 2016]   |  

Abstract

The TanSat carbon satellite is to be launched at the end of 2016. In order to verify the performance of its instruments, a flight test of TanSat instruments was conducted in Jilin Province in September, 2015. The flight test area covered a total area of about 11,000 km2 and the underlying surface cover included several lakes, forest land, grassland, wetland, farmland, a thermal power plant and numerous cities and villages. We modeled the column-average dry-air mole fraction of atmospheric carbon dioxide (XCO2) surface based on flight test data which measured the near- and short-wave infrared (NIR) reflected solar radiation in the absorption bands at around 760 and 1610 nm. However, it is difficult to directly analyze the spatial distribution of XCO2 in the flight area using the limited flight test data and the approximate surface of XCO2, which was obtained by regression modeling, which is not very accurate either. We therefore used the high accuracy surface modeling (HASM) platform to fill the gaps where there is no information on XCO2 in the flight test area, which takes the approximate surface of XCO2 as its driving field and the XCO2 observations retrieved from the flight test as its optimum control constraints. High accuracy surfaces of XCO2 were constructed with HASM based on the flight’s observations. The results showed that the mean XCO2 in the flight test area is about 400 ppm and that XCO2 over urban areas is much higher than in other places. Compared with OCO-2’s XCO2, the mean difference is 0.7 ppm and the standard deviation is 0.95 ppm. Therefore, the modelling of the XCO2 surface based on the flight test of the TanSat instruments fell within an expected and acceptable range. View Full-Text
Keywords: TanSat; flight test; XCO2 retrieval; HASM; XCO2 simulation TanSat; flight test; XCO2 retrieval; HASM; XCO2 simulation
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Zhang, L.L.; Yue, T.X.; Wilson, J.P.; Wang, D.Y.; Zhao, N.; Liu, Y.; Liu, D.D.; Du, Z.P.; Wang, Y.F.; Lin, C.; Zheng, Y.Q.; Guo, J.H. Modelling of XCO2 Surfaces Based on Flight Tests of TanSat Instruments. Sensors 2016, 16, 1818.

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