题名: Investigating the performance of a greenhouse gas observatory in Hefei, China
作者: Wang, Wei3; Tian, Yuan2,3; Liu, Cheng1,3,6; Sun, Youwen3; Liu, Wenqing3; Xie, Pinhua3; Liu, Jianguo3; Xu, Jin3; Morino, Isamu5; Velazco, Voltaire A.7; Griffith, DavidW. T.7; Notholt, Justus4; Warneke, Thorsten4
刊名: ATMOSPHERIC MEASUREMENT TECHNIQUES
出版日期: 2017-07-25
卷号: 10, 期号:7, 页码:2627-2643
英文摘要: A ground-based high-resolution Fourier transform spectrometer (FTS) station has been established in Hefei, China to remotely measure CO2, CO and other greenhouse gases based on near-infrared solar absorption spectra. Total column measurements of atmospheric CO2 and CO were successfully obtained from July 2014 to April 2016. The spectra collected with an InSb detector in the first year were compared with those collected by an InGaAs detector from July 2015, demonstrating that InGaAs spectra have better signal-to-noise ratios and rms of spectral fitting residuals relative to InSb spectra. Consequently, the measurement precision of the retrieved XCO2 and XCO for InGaAs spectra is superior to InSb spectra, with about 0.04 and 0.09% for XCO2, and 1.07 and 2.00% for XCO within clear-sky days respectively. Daily and monthly averages of columnaveraged dry air mole fraction of CO2 show a clear seasonal cycle, while the daily and monthly averages of XCO displayed no seasonal variation. Also, we analysed the relationship of the anomalies of XCO and XCO2, found that the correlations are only observable for individual days, and the data under different prevailing wind conditions during the observations displayed weak correlation. The observations based on the high-resolution FTS were also compared with the temporally coinciding measurements taken with a low-resolution solar FTS instrument, the EM27/SUN. Ratioing the daily averaged XCO2 of EM27 and FTS gives an overall calibration factor of 0.996 +/- 0.001. We also compared ground-based observations from the Tsukuba TCCON station with our observations, the results showing that the variation in phase and seasonal amplitude of XCO2 are similar to our results, but the variation of XCO in Tsukuba is quite different from our data in Hefei. To further evaluate our retrieved data, we made use of satellite measurements. The direct comparison of our observations with the Greenhouse Gases Observing Satellite (GOSAT) data shows good agreement of daily median XCO2, with a bias of -0.52 ppm and standard deviation of 1.63 ppm. The correlation coefficient (R-2) is 0.79 for daily median XCO2 between our FTS and GOSAT observations. Daily median Orbiting Carbon Observatory 2 (OCO-2) data produce a positive bias of 0.81 ppm and standard deviation of 1.73 ppm relative to our ground-based data. Our daily median XCO2 also show strong correlation with OCO-2 data, with correlation coefficient (R-2) of 0.83. Although there were a limited number of data during the observations due to instrument downtime and adverse weather, the results confirm the suitability of the observatory for ground-based long-term measurements of greenhouse gases with high precision and accuracy, and fulfil the requirements of the Total Carbon Column Observing Network (TCCON).
WOS标题词: Science & Technology ; Physical Sciences
类目[WOS]: Meteorology & Atmospheric Sciences
研究领域[WOS]: Meteorology & Atmospheric Sciences
关键词[WOS]: COLUMN OBSERVING NETWORK ; INSTRUMENTAL LINE-SHAPE ; FOURIER-TRANSFORM SPECTROMETER ; ATMOSPHERIC COMPOSITION CHANGE ; RETRIEVAL ALGORITHM ; SEASONAL CYCLE ; CARBON-DIOXIDE ; TCCON SITES ; ACOS-GOSAT ; CO2
收录类别: SCI
语种: 英语
WOS记录号: WOS:000406247700001
Citation statistics:
内容类型: 期刊论文
URI标识: [http://ir.hfcas.ac.cn:8080/handle/334002/33529]  
Appears in Collections:合肥物质科学研究院_中科院安徽光学精密机械研究所


作者单位: 1.Univ Sci & Technol China, Sch Earth & Space Sci, Hefei 230026, Anhui, Peoples R China
2.Univ Chinese Acad Sci, Beijing 10049, Peoples R China
3.Chinese Acad Sci, Anhui Inst Opt & Fine Mech, Key Lab Environm Opt & Technol, Hefei 230031, Anhui, Peoples R China
4.Univ Bremen, Inst Environm Phys, POB 330440, D-28334 Bremen, Germany
5.Natl Inst Environm Studies, Satellite Observ Ctr, Tsukuba, Ibaraki 3058506, Japan
6.Chinese Acad Sci, Inst Urban Environm, Ctr Excellence Urban Atmospher Environm, Xiamen 361021, Peoples R China
7.Univ Wollongong, Sch Chem, Northfields Ave, Wollongong, NSW 2522, Australia
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